National Mower Lawn Mower HY70OM 8 992 User Manual
HYDRO 70" TRIPLEX  
OWNER'S MANUAL  
Includes Assembly, Maintenance &  
Parts Lists  
For Serial Numbers 1586 & Up  
700RaymondAve.,P.O.Box14299,St.Paul,Minnesota 55114-0299, U.S.A.  
Phone (651) 646-4079 – Fax (651) 646-2887  
NATIONALMOWERCO.  
HYD70OM-8/99  
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NATIONAL HYDRO 70" TRIPLEX  
IMPORTANT  
National Mower Safe Operation Practices  
For Riding Mowers  
1. Know control functions and how to stop quickly. READ THE OWNER’S MANUAL.  
2. Do not allow children to operate the mower. Do not allow adults to operate the mower without proper  
instruction.  
3. Do not carry passengers. Keep children and pets at a safe distance from an operating mower.  
4. Clear the work place of objects which might be picked up by the blades and thrown.  
5. To start engine, operator must be seated, reel control must be disengaged and foot control must be in  
neutral.  
6. Takeallpossibleprecautionswhenleavingthemowerunattended,suchasshiftingintoneutral,stopping  
the engine and removing the ignition key.  
7. Donotstoporstartsuddenlywhengoinguphillordownhill. Useextremecautionwhenmowingonslopes.  
8. Reducetravelspeedonslopesandinsharpturnstopreventtippingorlossofcontrol. Useextremecaution  
when changing direction on slopes.  
9. Watch for holes in the terrain and other hidden hazards.  
10.  
Watch for dangerous traffic when crossing or near roadways.  
11. Neverdirectthedischargeofmaterialfromoperatingreelstowardbystandersnorallowanyonenearthe  
mower during operation.  
12. Handle gasoline with CAUTION - it is highly flammable.  
a. Use an approved gasoline container.  
b. Never fill the fuel tank indoors. Wipe spilled gas immediately.  
c. Opengaragedoorstoallowventilationifengineisruninside-exhaustfumesaredangerous. Donot  
run engine in any enclosed area.  
13. Keep the mower in good operating condition. Make sure that all safety switches are operating properly  
and all safety guards are in place at all times, except during servicing.  
14. Keep all nuts, bolts and screws tight to be sure that the mower is in a safe working condition.  
15. Neverstorethemower,withgasolineinthetank,insideabuildingwherethefumescouldreachanopen  
flame or spark. Allow the engine to cool before storing in any enclosure.  
16. Keep the engine free of grass, leaves or excessive grease to reduce a fire hazard.  
17. The mower and reels should be stopped and inspected for damage after striking a foreign object. The  
damage should be repaired before restarting and operating the mower.  
18. Do not change the engine governor settings or over speed the engine.  
19. Proceed as follows when mowing.  
a. Mow only in the daylight or in good artificial light.  
b. Never make a cutting height adjustment while the engine (motor) is running.  
c. Shut the engine (motor) off when removing grass or unclogging reels.  
WARNING– California, USA residents are required by law (CA PRC 4442 & CA H & SC 13005) to equip their  
engines with spark arresters when operating in flammable vegitation. Arresters must be obtained from your  
engine dealer and are not available from National Mower Company.  
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TABLE OF CONTENTS  
Declaration Of Conformity ............................................................................. 2  
Safe Operating Practices .............................................................................. 3  
Introduction ................................................................................................... 5  
Receipt of Shipment ...................................................................................... 5  
Specifications ............................................................................................6-9  
Engine Specifications ............................................................................ 6  
Transmission .......................................................................................... 6  
Vehicle Specifications ............................................................................ 6  
Battery ................................................................................................... 6  
Mower Specifications ............................................................................. 6  
Weight and Dimensions ......................................................................... 6  
Lubricants .............................................................................................. 6  
DisposalNumbers .................................................................................. 7  
Noise Emission and Vibration................................................................. 7  
Decals .................................................................................................7-8  
AssemblyInstructions .............................................................................. 9-10  
GeneralInformation......................................................................... 11-12  
Engine.................................................................................................. 11  
Traction Drive Train.............................................................................. 11  
ReelDrive ............................................................................................ 11  
Ignition Switch ...................................................................................... 11  
Hourmeter ........................................................................................... 11  
Ammeter............................................................................................... 11  
ReelControl ......................................................................................... 11  
Choke .................................................................................................. 12  
ThrottleLever ....................................................................................... 12  
TractionPedal ...................................................................................... 12  
Mow and Lift Treadle ............................................................................ 12  
Free Wheeling Valve ............................................................................ 12  
Drop/LiftNeedleValve .......................................................................... 12  
InterlockSwitches ................................................................................ 12  
Operation .................................................................................................... 13  
Adjustments ................................................................................................. 13  
TractionPedal ...................................................................................... 13  
ReelControlClutch ........................................................................ 13, 14  
SeatSwitch .......................................................................................... 14  
Height of Cut ........................................................................................ 14  
Reel to Bedknife ................................................................................... 15  
Reel End Play ...................................................................................... 15  
Backlapping Procedure .................................................................. 15, 16  
Grinding Procedure.............................................................................. 16  
Maintenance ............................................................................................... 17  
General ................................................................................................ 17  
AssemblyandDisassembly .................................................................. 17  
Battery ........................................................................................... 17, 18  
Charging a Battery ............................................................................... 18  
BedKnifeReplacement ........................................................................ 18  
Fuel filter .............................................................................................. 18  
Engine.................................................................................................. 18  
Electrical System ................................................................................. 18  
HydraulicHoses ................................................................................... 19  
Hydraulic Oil......................................................................................... 19  
Hydraulic Oil Filter ................................................................................ 20  
HandleBarRemoval ............................................................................. 20  
JumperCables ..................................................................................... 20  
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NATIONAL HYDRO 70" TRIPLEX  
Lubrication ........................................................................................... 20  
Painting ................................................................................................ 20  
BeltReplacement ........................................................................... 20, 21  
CouplingAlignment .............................................................................. 21  
Storage ....................................................................................................... 22  
GeneralInstructions ............................................................................. 22  
Engine.................................................................................................. 22  
Battery ................................................................................................. 22  
Tractor ................................................................................................. 22  
Tires ..................................................................................................... 22  
Starting After Storage........................................................................... 22  
TroubleShootingGuide ............................................................................... 23  
Engine Will Not Start ............................................................................ 23  
Tractor Will Not Move ........................................................................... 23  
ReelNotTurning................................................................................... 23  
Reel Will Not Cut .................................................................................. 23  
Lubrication ..................................................................................... 24, 25  
Electrical Schematic............................................................................. 26  
Parts List and Ordering Information............................................................. 27  
Tank and Rear Fork Assembly ....................................................... 28, 29  
SteeringTowerAssembly ............................................................... 30, 31  
Engine and Footrest Assembly ....................................................... 32, 33  
Traction Pedal and Pump Assembly ............................................... 34, 35  
Lift Arm and Drive Assembly .......................................................... 36, 37  
FrontCuttingUnitAssembly ........................................................... 38, 39  
RearCuttingUnitAssembly ............................................................ 40, 41  
Hydraulic Hose and Line Assembly ................................................ 42, 43  
Hydraulic Fitting Assembly ............................................................. 44, 45  
BasketAssembly .................................................................................. 46  
BeltToo ............................................................................................... l46  
Height Of Cut Bar ................................................................................. 47  
Pump ................................................................................................... 47  
Wheel Motor......................................................................................... 48  
LiftValve .............................................................................................. 48  
Lift Cylinder.......................................................................................... 49  
Front Roller Scraper Kit........................................................................ 49  
Rear Roller Scraper Kit ........................................................................ 50  
ValveBlock .......................................................................................... 50  
Warranty..................................................................................................... 51  
1—INTRODUCTION  
Please furnish us with the Model Number, Serial  
Number and Date of Purchase when contacting us about  
yourmachine.Designationsofright,left,frontandrearare  
used as if the operator was sitting in the mower seat.  
This manual has been prepared by National Mower  
Company as an aid to users for assembly, maintenance,  
adjustment and ordering replacement parts. Additional  
information will gladly be furnished by calling or writing  
NationalMowerCompany.  
2—RECEIPT OF SHIPMENT  
NOTE  
Carefullyinspectyourmachineandcratefordamage  
that could have occured during shipment. If damages or  
shortages are noted, have the transportation company’s  
representative note this on the bill of lading.  
Claims for shipping damages must be noted by the  
consignee at the point of destination and filed with the  
transportationcompanythatdeliverstheshipment.  
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3—SPECIFICATIONS  
3.1—ENGINESPECIFICATIONS  
3.5—MOWERSPECIFICATIONS  
TYPE: Twin Cylinder, Air Cooled  
ENGINE MODEL: Briggs & Stratton Vanguard  
HORSEPOWER: 11.9 kw (16 hp)  
COOLING: Ducted air flow  
NUMBER AND SIZE: 3 – 25" Reels  
REEL DIAMETER: 7" (17.8 cm)  
BEARINGS:TimkenTaperedRoller  
BLADES: Six Alloy Steel Blades  
HEIGHT OF CUT: Adjustable: 1/2” to 2" (1.3 cm to  
5.08 cm)  
3.2—TRANSMISSION  
OVERALL CUTTING WIDTH: 70" (177.8 cm)  
HEIGHTADJUSTMENT:RollerScrewAdjustment  
TRACTIONDRIVE: Direct coupled variable displacement  
hydraulic pump with high torque  
wheelmotors.  
BEDKNIFE ADJUSTMENT: Screw adjustment of reel to  
bedknife.  
OILTANK: ............................. 18.9 L (5 gallon) capacity  
REELFLOATATION:FrontandRearRollerwithCutting  
UnitCenter-linePivot.  
3.3—VEHICLESPECIFICATIONS  
3.6—WEIGHT&DIMENSIONS  
FUEL TANK: 18.9 L (5 gallon) capacity  
WHEELS AND TIRES:  
OVERALL LENGTH: 86-3/8" (219.4 cm)  
OVERALL HEIGHT: 44-3/4" (113.6 cm)  
WHEEL BASE: 50-3/4" (128.9 cm)  
Front: 20-10 x 8.00 Tubeless Turfmate  
Rear: 18-8.50 x 8.00 Tubeless Turfmate  
TIRE PRESSURE: 10-12 PSI  
WHEEL TREAD WIDTH: 45" (114.3 cm) (center of tires)  
OVERALL WHEEL WIDTH: 55" (139.7 cm)  
OVERALL WIDTH: 75" (190.5 cm)  
FRAME: Welded steel construction  
MOWING SPEED: 0- 12 K/H (0 - 7.5 MPH)  
TRANSPORT SPEED: 12 K/H (7.5 MPH)  
REVERSE SPEED: 3 K/H (2 MPH)  
CONTROLS:  
WORKING WEIGHT: 1, 085 lbs. (492 kg)  
3.7—LUBRICANTS  
Foot operated traction pedal for forward and  
reverse.  
ENGINEOIL:  
Use high-quality detergent oil API (American  
Petroleum Institute) service class SF. Select the  
viscosity based on the air temperature at the time of  
operation as shown in the table.  
Hand operated choke and throttle levers.  
Foot operated hydraulic lift with auto start/stop  
feature.  
Handoperatedreelengagementlever.  
Free-wheelingvalve.  
Recommended SAE Oil Viscosity Grades  
3.4—BATTERY  
TYPE: Group U1 Type GT  
NOMINALVOLTAGE: 12V  
DIMENSIONS: L: 7-3/4”(19.68 cm) x W: 5-3/16”  
(13.17 cm) x H: 7-5/16”(18.5 cm)  
HYDRAULICSYSTEMOIL:  
Use ISO GRADE 100 (SAE 30W) Hydraulic Oil  
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3.9—NOISEEMISSION&VIBRATION  
3.8—DISPOSALNUMBERS  
Sound:  
Operator Position, 88 dBA  
Sound Power Level (LwA), 106 dBA  
Max. Vibration, 57.7 m/s2 RMS  
Location, Left Hand  
Petrol, Lead Free: ....................... 54104  
Engine oil:................................... 54112  
Fiberglassparts: ......................... 57103  
Tires:........................................... 57502  
Gear oil: ...................................... 54112  
Grease: ....................................... 54202  
Plastictanks:............................... 57127  
Vibration*:  
Operating Condition: Engine rpm-3200, Unit stationary  
3.10—TRANSFERS  
07403  
NATIONAL MOWER CO.  
700 RAYMOND AVE.  
ST. PAUL, MINNESOTA 55114 USA  
651-646-4079  
FAX 651-646-2887  
POWER RATING: 9.7 kW at: 3200 rpm  
WEIGHT: 528 kg  
07406  
07372  
07256  
07404  
07257  
07405  
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TRANSFERS,Continued  
07408  
07409  
07407  
3.11—TRANSFERDESCRIPTION  
07406 Do not exceed 25 degree slope. Located on main chassis.  
07403 Parking brake on/off. Located on main chassis.  
07372 Manufacture’s identification and specifications. Located on main chassis.  
07257 Mowers up/reels off. Located on main chassis.  
07256 Mowers down/reels on. Located on main chassis.  
07405 Sound level at operators position. Located on main chassis.  
07404 Sound power level. Located on main chasis.  
07408 Mow pedal operation and vehicle motion pedal operation. Located on main chassis.  
07409 Main instrument panel, Three wheel drive unit. Located on main chassis.  
07407 Main instrument panel, Two wheel drive unit. Located on main chassis.  
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4—ASSEMBLY INSTRUCTIONS  
4.1—ASSEMBLY  
The Hydro 70 is shipped in two separate crates, one for  
the tractor and one for the cutting units.  
4.2—TRACTOR ASSEMBLY  
1. Disassemble crating for the tractor carefully to  
preventdamagetocomponents.  
SEAT  
SUPPORT  
2. Remove the tape holding the keys in the steering  
shaft. Position the handlebar assembly over the shaft  
and key securing it with set screws provided it the  
handle bar.  
3. For removal of handle bar see Section 8.12.  
6. Tires should be checked and if necessary adjusted for  
proper inflation. Refer to Section 3.3.  
4. Remove the tower cover. Refer to section 3.4 for  
battery specifications. Install the battery on the base  
inside the tower. Attach the red wire to the positive  
terminal of the battery and attach the black ground wire  
to the negative terminal of the battery. Replace and  
secure the tower cover.  
7. Check the oil level in the oil tank. Refer to Section 8.10.  
8. Check the oil level in the engine. Refer to 3.7 and 5.1.  
HANDLEBAR  
4.3—ASSEMBLY OF REAR CUTTING  
UNIT TO TRACTOR  
KEY  
1. Disassemble crating for the cutting units carefully to  
preventdamagetocomponents.  
2. Position the rear cutting unit under the tractor. The  
rear cutting unit can be identified by the reel guard  
attached the rear of the cutting unit. Position the cutting  
unit with the reel pulley on the right side of the tractor.  
COVER  
NOTE  
Belt tool kit Part# 070008 is available  
thruNationalMower’spartsdepartment.  
This tool will simplify the assembly of the  
cutting units.  
5. The seat base is temporally held together for  
shipment. Remove and discard the fastener securing  
the seat base to the spring plate. Position the seat  
slider, which is assembled to the seat, onto the seat  
base plate and secure with locknuts provided.  
3. Remove the tie wrap holding the pull arm and spring  
to the cutting unit. Assemble the pull arm to the tractor  
using the sleeve and fastener provided.  
Attach the safety switch wires to the switch located  
under the seat. Wires can be connected to either  
terminal.  
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ASSEMBLY OF REAR CUTTING UNIT, Con't.  
4. Remove the two top fasteners holding the pivot  
bracket to the cutting unit and loosen the bottom  
fastener so the bracket is free to rotate.  
9. Remove the tie wrap attaching the cutting unit belts  
to the tractor. Position the cutting unit in front of the  
tractor with the pulleys to the inside. Remove the two  
top fasteners holding the pivot bracket to the cutting.  
Place the belt on the cutting unit pulley. Assemble the  
push arm to the pivot bracket using the washers and  
snap ring provided. Rotate pivot bracket into place  
using it as a lever arm to compress the spring and  
reattachwithpreviouslyremovefasteners.  
5. Align and assemble the spring and pull arm  
previously attached to the tractor to the pull arm shaft on  
the cutting unit. Place the belt on the cutting unit pulley.  
With the pull arm assembled, rotate the pivot bracket  
into place using it as a lever arm to compress the spring  
and reattach with previously removed fasteners.  
10. Attach counterbalance spring and chains to lift bar.  
6. Assemble the pull rod on the left side of the cutting  
unit to the tractor using fasteners provided.  
11. Connect link bar between cutting units with  
fastenersprovided.  
7. A counterbalance spring has been assembled to the  
tractor located under the steering tower. Remove the  
spring bushing from the cutting unit making note of its  
location. Insert the spring bushing into the spring loop,  
pull directly down on the spring and reinsert the fastener  
provided thru the bushing into the hole on the cutting  
unit.  
PUSHARM  
LINKBAR  
8. Remove the tie wraps securing the lift chains and  
attach the chains to the lift arm under the tractor. One  
chain per side.  
PIVOT  
BRACKET  
PULL  
ROD  
FRAME  
PIVOTBRACKET  
Belt tool, complete with instructions, (below) available  
through National Mowers Parts Department.  
PUSH  
ARM  
PUSHARM,SPRING  
& SLEEVE  
PART#070008  
SHAFT  
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5—GENERAL INFORMATION  
5.1—ENGINE  
Your vehicle is powered by twin cylinder, 4  
cycle Briggs & Stratton Vanguard engine which uses  
unleaded gasoline, 85 octane minimum. DO NOT MIX  
OIL WITH GASOLINE! Engine speed is controlled by  
means of a throttle lever mounted on the left side of  
consolepanel.  
b. Key should be removed when tractor is not  
in use to prevent unauthorized operation.  
c. Refer to section 4.2 in the Hydro 70  
Operator’s Manual for complete starting information.  
A separate Engine Manual, prepared by the  
engine manufacturer is supplied. Study the manual  
carefully until you are familiar with the maintenance,  
operation, adjustment and repair of your equipment.  
Proper attention to the engine manufacturer’s directions  
will assure maximum service life of the engine and  
highest operating efficiency.  
5.5—HOUR METER  
The hour meter indicates the number of hours  
the tractor has been operated. It can be used to keep  
track of maintenance intervals and the amount of time  
required to perform various tasks. The hour meter  
operates whenever the ignition key is in the “ON”  
position.  
5.2—TRACTION DRIVE TRAIN  
Power from the engine is transmitted to the  
variable displacement pump through a drive coupling.  
The pump supplies hydraulic fluid to wheel motors. The  
wheel motors provide the differential action required in  
turns.  
5.6—AMMETER  
The ammeter indicates the condition of the charging  
circuit. If the ammeter indicates a negative reading refer  
to the Briggs and Stratton engine manual.  
5.3—REELDRIVE  
Power to the reels is transmitted from the engine  
to a jackshaft mounted under the engine through a  
spring loaded belt drive. Three separate belts trans-mit  
the power from the jackshaft to the mowers.  
5.7—REEL CONTROL  
The reel control lever must be in the disengaged  
or back position to start the engine. Placing lever in  
engaged position will allow reels to run when mowers are  
lowered.  
5.4 IGNITIONSWITCH  
Never operate the mowers when they are not  
cutting grass as excessive friction and heat will develop  
between the bedknife and reel, and damage the cutting  
edge.  
The reel control lever must be in the disengage  
position and the traction control pedal is in the neutral  
position before starting engine. Insert key in switch,  
turn clockwise as far as it will go to start engine, then  
release.  
a. Do not hold key in “ON” position more than  
30 seconds at a time.  
11  
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5.8—CHOKE  
When starting a cold engine, pull the choke  
The valve is located under the left shield on the  
front side of the vehicle. With the engine “OFF”, turn  
knob to open valve and permit free-wheeling. Free-  
wheeling valve must be closed during normal operation  
or tractive effort will be severely reduced.  
control out to close the choke plate and allow a richer  
fuel mixture to enter the engine. After the engine starts,  
push the choke control about half way in to keep the  
partially closed. Push the choke control all the way in to  
open the choke plate for normal operation after the  
choke plate engine is properly warmed. A warm engine  
usually requires less choke to start.  
5.13—DROP/LIFTNEEDLEVALVE  
5.9—THROTTLE LEVER  
A needle valve is located under the left shield on  
the front side of the vehicle. By turning the needle valve  
knob, the speed of drop and raising of the cutting units  
can be adjusted as desired.  
Push forward to increase engine speed, pull  
back to decrease.  
5.10—TRACTION PEDAL  
Familiarize yourself with the instrument  
panel and the controls. Study the  
instructions and learn to use the controls  
correctly. Keep hands and feet away from  
controls unless you intend to use them.  
The traction pedal operates the forward and reverse  
direction and speed of the machine. By pushing the toe  
of the pedal down, the forward speed is increased. By  
pushing the heel of the pedal down the reverse speed is  
increased. When the traction pedal is released the  
machine will slow down and stop.  
3.13 INTERLOCK SWITCHES  
5.11—MOW AND LIFT TREADLE  
Depress and hold the down pedal with left foot to  
lower mowers. Reels will rotate if reel control lever is in  
“ENGAGED” position. Depress and hold the up pedal to  
raise mowers. Reels will stop if control lever is in  
“ENGAGED” position when mowers are raised.  
There are four interlock switches on your Hydro  
70. They are a safety precaution which will allow you to  
start your mower only when the traction pedal is in  
neutral, the reel control lever is in the disengaged  
position and operator is seated on the tractor. If you  
are able to start your mower with these levers in any  
other position, adjustment of the switches is required.  
NOTE  
When operating the mow or lift pedal,  
keep the pedal depressed until the  
mowershavebeencompletelylowered  
or raised, and then release the pedal.  
1. The neutral start switches are located under the  
traction control pedal.  
2. The reel control lever switch is located on the side of  
the console and is activated by the reel lever.  
5.12—FREE-WHEELINGVALVE  
3. The seat switch is located under the seat and is  
activated by the weight of the operator.  
To permit moving the Hydro 70 without starting  
the engine, a freewheeling device or tow valve has been  
provided.  
12  
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6—OPERATION  
See Section 4.0 in the National Mower Hydro 70  
Operators Manual for unit operation.  
7—ADJUSTMENTS  
7.1—ADJUSTMENTS  
TRACTIONPEDAL  
TRACTIONPEDAL  
SAFETYSWITCHES  
Read each instruction completely and  
make sure you understand it before  
making any adjustment. Follow all the  
safety precautions.  
THREADED ROD &  
ROD END  
PUMPCONTROL  
To avoid possible serious bodily injury,  
before making any adjustments or  
performing maintenance, place all tractor  
controls in Neutral, engage parking  
brake, fully lower cutting units to the  
ground, turn ignition switch “Off” and  
remove key.  
BEARING  
7.2—TRACTION PEDAL  
ADJUSTMENT  
7.3—REEL CONTROL CLUTCH  
ADJUSTMENT  
The reel control clutch idler is preset at the factory.  
However, if adjustment is necessary, the position of the  
idler can be adjusted with the clevis on the clutch rod.  
Loosen the jam nut that locks the clevis to the clutch  
rod and turn the clevis further onto the rod until proper  
tension is achieved, and re-tighten nut against clevis.  
If clevis bottoms out on the threaded rod replace the  
belts.  
The Traction pedal is equipped with two safety  
switches and a neutral centering device. The switches  
prevent the engine from starting when the pedal is  
positioned in reverse or forward. The centering device  
locates neutral positioning of the pump.  
Prior to adjusting for creep, elevate the wheels  
off the ground and support the vehicle securely. Any  
adjustments should be done while the hydraulic oil is  
warm.  
CLEVIS  
CLUTCH ROD  
To adjust the creep of the drive wheels loosen  
the fastener attaching the ball bearing to the control arm  
and move the bearing within the slot to achieve neutral.  
CLUTCHIDLER  
LIFTSTRAP  
Once the traction pedal has been adjusted, the  
switches may have to be re-adjusted by moving the  
switches in the range of the slots provided in the switch  
bracket. Adjust switches so that unit cannot be started  
unless pedal is in the neutral position.  
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REEL CONTROL CLUTCH  
ADJUSTMENT,Continued  
After loosening adjusting nuts on each side of  
the reel assembly, place a gauge plate under the  
bedknife and roller measuring the distance between  
bedknife cutting edge and the rollers. Adjust front and  
rear rollers equally and insure that the bottom of the  
bedknife is parallel with the ground. After height of cut  
setting is determined, re-tighten roller adjustment nuts.  
If clutch idler is restricted from its proper  
function, (engaging and disengaging reel belt drive),  
follow these steps. Refer to figure on the previous page.  
1. Make sure clutch rod is free from any restriction by  
moving lever arm back and forth.  
NOTE  
A height of cut tool, Part #070009 (shown  
below), complete with instructions, is  
availablethroughtheNationalMower  
PartsDepartment.  
2. Loosen mounting bolts for the clutch idler. If the  
mounting bolts are torqued too tight, it restricts idler  
movement.  
3. Loosen the pivot bolt between the idler arm and lift  
strap. Any restriction at this point will cause  
restriction with the idler arm.  
ROLLERADJUSTERS  
BED BAR  
BED  
KNIFE  
7.4— SEAT SWITCH ADJUSTMENT  
The HYDRO 70 has a safety switch mounted  
directly to the seat bottom. The switch requires no  
adjustment.  
BAR  
ROUNDHEAD  
SCREW  
HEXHEAD  
CAPSCREW  
WINGNUT  
If wires should become disconnected  
from the seat switch it prohibits other  
safety features from working properly.  
INSTRUCTIONS:  
1. Preparation of bar—Position round head capscrew  
to desired height of cut. Measure from flat surface of  
bar to the underside of round head screw. Lock  
round head screw in position with wing nut.  
To avoid possible serious bodily injury,  
before performing any adjustments,  
maintenance, or lubrication, place all  
controls in “Neutral”, lower the mowers to  
the ground, engage parking brake, turn  
ignition switch off and remove key.  
Position hex head capscrew 1/8 less than desired  
height of cut. Measure from flat surface of bar to the  
top of the hex head capscrew. Lock hex head  
capscrew in position with wing nut.  
2. Setting height of cut—Hook round head screw on top  
edge of bedknife, and rest hex head capscrew  
againstbedbar.  
7.5—HEIGHT OF CUT ADJUSTMENT  
The height of cut is variable and adjusted by  
moving the front and rear roller brackets to the desired  
height.  
Adjust front and rear roller adjusters so that the  
rollers contact bar. Check roller placement for the full  
length of the cutting unit by moving the bar side to  
side while still located on the bedknife/bedbar to  
achieve consistent height of cut the full width of the  
cutting unit. Lock roller adjusters in place.  
It is important to get all rollers adjusted to the  
same height, keeping the bed knife parallel to the  
ground, so that there will be uniform cutting on the entire  
width of the mower. Do not adjust rollers by sight.  
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7.8— BACKLAPPINGPROCEDURE  
7.6— REEL TO BEDKNIFE  
ADJUSTMENT  
Back lapping is a very important step in  
maintaining sharp reel blades on the rear and wing  
mowers.  
The reel is adjusted to a fixed position bedknife.  
This makes a more rugged and stable frame retaining  
adjustmentlonger.  
Many types of compounds are available for  
lapping. However, we recommend a good pre- mixed  
water soluble compound such as Pinhigh. Prices, grit  
ranges and ordering information are available by calling  
a toll free phone number 1-800-422-4748. Pre-mixed  
compound saves the time required to mix, eliminates the  
waste of abrasive, rinses off easily with water and is  
available in all grit ranges from coarse to extra fine.  
To adjust the reel to bedknife contact, turn the  
hex adjuster on each side of the reel down. Proceed  
slowly and do not over adjust - about 1/8th of a turn on  
each side. Do not over tighten. A too tight reel will wear  
much faster. The reel should “wipe” or lightly touch the  
bedknife. By using paper strips held between reel and  
bedknife, check to see that blades are cutting the paper  
all the way across.  
This procedure should be performed when the  
reel blades and bed knife become slightly rounded and  
the grass is not cut cleanly with only a slight bed- knife  
adjustment. After grinding the bedknife and reels,  
backlapping should be done to establish a perfect match  
between the bedknife and reel blades.  
Use heavy gloves and be careful—  
blades are sharp!  
1. Clean cutting units of any foreign debris and  
disengage reel clutch.  
2. Make sure to adjust the bedknife to the reel so that  
the bedknife is level with the reel and light contact is  
maintained.  
7.7—REEL END PLAY ADJUSTMENT  
3. Reels must be run in a reverse direction to be  
lapped. Remove exterior guards as needed. Attach  
a back lapping machine (not supplied by National  
Mower) to one of the outside reel stub shafts of the  
front two cutting units, following the instructions  
furnished by the backlapping machine  
As the reel is used, normal wear of the reel  
bearings will cause end play. This condition could cause  
uneven wear to moving parts and uneven cutting of turf.  
Test for end play periodically by trying to move  
the reel from side to side in the frame. If there is any  
movement, adjust by loosening the locknut on the  
adjustment body, which is located on the inside right  
end of the reels and turn adjustment bolt in a half turn or  
less. Do not overtighten as it would cause excessive  
bearing wear. Test again for end play, if reel is rotating  
freely and end play can not be detected, retighten the  
locking nut on adjustment bolt.  
manufacturer.  
NOTE  
Some back lapping machines may not rotate all  
three cutting units simultaneously. If this occurs  
back the reel adjustment off or disconnect the  
remaining two cutting units and concentrate on  
one cutting unit at a time.  
LOCKNUT  
& SCREW  
4. With reels running, and concentrating on one reel,  
apply the lapping compound using a 2" or 3" wide  
brush. Apply the compound evenly to the mowing  
blades. Adjustment of the reel to bedknife may be  
required, relap as necessary.  
Be extremely careful not to let the brush,  
your fingers or your clothing get caught  
in the reels. Use approved safety  
glasses to protect eyes from flying  
particles and abrasives.  
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BACKLAPPINGPROCEDURE,Continued  
5. Stop the reel and examine both bed knife and reel  
blades to see that the cutting edges are uniformly  
sharp. If not, gradually tighten hex adjuster and  
repeat Step 4 on previous page until the proper  
sharpnessresults.  
6. Rinse off the compound thoroughly with water to  
remove all abrasive. Check for sharpness and  
readjust the bed knife if necessary.  
7. Check reel adjustment on each mower and adjust if  
necessary, so that they will cut paper cleanly across  
the full length of the bed knife when paper is held  
90# to the bedknife and pinched when held  
horizontally.  
7.9—GRINDINGPROCEDURE  
Be extremely careful not to let brush,  
your fingers or your clothing get caught in  
the reels. Use approved safety glasses to  
protect tour eyes from flying particles and  
abrasives.  
BACKGRINDINTHE  
DIRECTION  
OF THE ARROW AT 25O  
Reels must be ground at 25° in the direction shown by the  
arrow.Backgrinduntilreelbladesarefreefromroundness,  
dents and nicks. Spin grind to remove all burrs. All blades  
must be on the same diameter.  
For maximum cutting efficiency, grind bed knife top and  
front edges at 5° as shown.  
25O  
GRINDBEDKNIFE  
ATANGLESSHOWN  
5O  
5O  
Notecenterline  
POSITION OF REEL  
TO THE BLADE  
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8—MAINTENANCE  
8.2—ASSEMBLY&DISASSEMBLY  
Use the illustrations in the Parts Section as reference  
for the disassembly and assembly of components.  
Always maintain relative position of parts when  
disassembling. Clean and lubricate individual parts and  
components as required.  
To avoid possible serious bodily injury,  
before performing any adjustments,  
maintenance, or lubrication, place all  
controls in “Neutral”, lower the mowers to  
the ground, engage parking brake, turn  
ignition switch off and remove key.  
8.3—BATTERY  
1. Make certain the ignition switch is in the “Off”  
position and the keys have been removed.  
2. Refer to Section 3.4 in this manual for battery  
specifications.  
8.1—GENERALMAINTENANCE  
The long trouble-free life of your machine  
depends on the maintenance it receives. Set up a  
maintenance program for your Hydro 70 to cover the  
followingpoints:  
Always wear protective glasses or  
goggles and protective clothing when  
working with batteries. You must follow  
the battery manufacturer’s instructions on  
safety, maintenanceandinstallation  
procedures.  
1. Keep tractor and mowers clean.  
2. Keep all moving parts properly lubricated.  
3. Keep all parts properly adjusted.  
3. When the battery is being installed or removed,  
make sure that the positive and negative terminals  
do not come in contact with metal tractor parts at the  
same time or severe damage will result.  
Always connect the “ground” (black) cable last  
and remove it first whenever performing any  
maintenance.  
4. Inspect for loose, worn or damaged parts  
(Fittings and hoses).  
4. Battery connections must be kept clean and tight at  
all times. Loose cables will cause eventual battery  
failure. Keep terminal covers in place.  
5. Keep shields in place at all times.  
6. Keep tires properly inflated.  
5. Use soap and water to clean the battery as required.  
Care must be taken to prevent soap and water from  
getting inside the battery.  
6. Brighten the terminal contact surfaces with steel  
wool.  
If your inspection reveals worn or damaged  
parts, replace these parts before operating machine or  
before actual breakdown occurs.  
7. Apply a light coat of petroleum jelly or chassis  
lubricant to terminals and cable ends to prevent  
corrosion.  
8. Tighten cables securely to battery terminals.  
To avoid injury from hot, high pressure  
oil, never disconnect hydraulic hoses  
with attachments in up position. Never  
run hands across tubes, hoses or fittings  
to check for leaks. Hydraulic fluid  
escaping under pressure can have  
sufficient force to penetrate skin.  
Batteries contain sulfuric acid and  
generateexplosivemixturesofhydrogen  
and oxygen gases. Keep any device  
which may cause sparks or flames away  
from the battery to prevent explosion.  
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8.4—CHARGING A BATTERY  
1. Remove the battery from the tractor before  
charging.  
8.6—FUELFILTER  
Before servicing the fuel filter, thoroughly clean  
outside of filter housing and fuel hoses, dirt must not be  
allowed to enter into fuel or fuel system. Refer to the  
engine manual for specific instructions.  
2. Be sure charger is “Off”.  
3. Connect charger leads to battery. Connect the  
positive (+) connector from the charger to the  
positive battery terminal. Connect the negative (–)  
connector of the charger to the negative battery  
terminal.  
8.7—ENGINE  
Refer to Engine Manual for manufacturer’s  
maintenance recommendations. Change oil and oil filter  
after the first 25 hours of operation and every 150 hours  
thereafter.  
To avoid possible injury, stand away from  
battery when charger is turned on. A  
damaged battery or a battery with an  
internalshortcouldexplode.  
NOTE  
Engine replacement parts should be ordered  
through your local Briggs & Stratton dealer.  
4. Charge the battery using one of the methods shown  
below. Follow the manufacturer’s instructions on the  
charger.  
8.8—ELECTRICALSYSTEM  
Make certain all terminals and connections are  
kept clean and properly secured.  
5. If when charging the battery, violent gassing or  
spewing of electrolyte occurs, or the battery case  
feels hot (125 F- 52 C), reduce or temporarily halt  
charging to avoid damaging the battery.  
1.  
2.  
3.  
Check switches regularly to be sure they are kept  
clean and operating correctly. See 7.2, 7.3 and  
7.4 in the “Adjustments” section.  
6. Always turn charger to “Off” before removing a the  
battery.  
Keep wire harness and all individual wires away  
from moving parts to prevent abrasive wear or  
potential short circuits.  
MAINTENANCE:  
SlowCharge  
Fast Charge  
10 hours @ 5 amps  
5 hours @ 10 amps  
2-1/2 hours @ 20 amps  
1-1/2 hours @ 30 amps  
1 hour @ 45 amps  
Exercise extreme care when working with the  
electricalsystem.  
8.5—BEDKNIFEREPLACEMENT  
Tack weld this edge  
When the bed knife becomes damaged or too worn to keep  
sharp, it must be replaced. Design improvements have made  
bed knife replacement easier with bolt-on construction. Follow  
theprocedurebelow.  
1. The backbar (1), bed knife (2) and fasteners have been  
assembled at the factory under tension. To ease  
replacement and prevent misalignment of components, the  
leading edge of the backbar must be tack welded two or  
three places before the old fasteners are removed.  
2. Remove shoulder nuts (3) and flat head screws (4). If  
shoulder nuts are badly rusted or corroded, they may have  
to be cut off and screws driven out to be removed.  
3. Clean the bottom surface of the backbar for maximum  
metal contact with the new bed bar.  
4. Fasten the new bed knife to the bottom of the backbar in  
the position shown (bent edge up). Shoulder of shoulder  
nuts must be seated firmly in the backbar and screws must  
be flush with the bottom of the bed knife.  
5. Torque shoulder nuts 35 to 40 ft/lbs.  
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8.10—HYDRAULICOIL  
8. 9—HYDRAULIC HOSES  
1. Hydraulic hose and tube lines should be inspected  
every week to check for cuts, loose connections,  
kinks and wear.  
1. The reservoir should be checked daily for proper  
level in the sight glass gauge on rear of the oil tank.  
Oil level should be seen in the sight glass.  
2. Park the tractor on a flat or level surface. Fully  
lower all cutting units.  
To avoid serious bodily injury, always  
lower mowers to the ground, place all  
controls in Neutral and shut off engine  
before inspecting hydraulic lines or  
hoses. Never run hands across tubes,  
hoses or fittings to check for leaks.  
3. Oil should be at 60 F to 90 F (16 -32 C), when  
checking level. Do not check oil level when oil is  
hot.  
4. Drain and replace the hydraulic oil every 500  
hours. Use Hydraulic oil as listed in 3.7 of the  
“Specifications” section of this manual.  
2. Be sure tubes and hoses do not come in contact  
with other frame parts which could cause abrasive  
wear. Always replace worn hoses or tubes before  
operatingmachine.  
a. The oil should be changed after a major  
component failure, or if you notice the  
presence of water (noted by a cloudy or milky  
appearance), air (noted by foam), or a rancid  
odor (indicating excessive heat).  
a. Assemble nut, sleeves, and tube to fitting body  
with minimum torque (finger tight) until flare contacts  
seat on fitting body.  
b. Once a year check the breather element in  
the tank cap and replace if necessary.  
b. For tightening reference, mark a line lengthwise  
on both the nut and adapter fitting with a marker.  
5. To drain hydraulic oil tank, remove drain plug from  
bottom of tank and loosen to remove fill cap on top  
of tank.  
c. Using a wrench, rotate the nut to tighten. Turn  
the nut the amount shown in the chart following. The  
line will show which fittings have been tightened and  
how much.  
6. Reinstall drain plug and fill hydraulic tank to full level  
on sight gauge, use only filtered hydraulic oil. The  
total hydraulic system oil capacity is approximately  
5gallons.  
d. On hoses with “O” ring fittings, make sure “O”  
rings are clean and hose fittings are properly seated  
beforetightening.  
7. Jack up front tires so they spin freely.  
3. Hold the fixed portion of the hose coupling with one  
wrench; use a second wrench to tighten or loosen  
the hose nut. This will prevent damage to the fitting  
seal. When tightening a hose, do not allow it to  
twist; hold it in a normal straight portion.  
8. Start engine: operate the traction pedal and cycle  
lift cylinder for a minimum of three minutes.  
Recheck oil level in sight glass gauge.  
Tube O.D. or Hose I.D.  
Rotate No. of Hex Flats  
3/8"  
1/2"  
5/8"  
1"  
2
2
1-1/2 to 2  
3/4 to 1  
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MAINTENANCE,Continued  
8.13—JUMPERCABLES  
Before attempting to “jump” the battery, check  
the condition of the battery, check the water level and  
refer to the battery manufacturer’s instructions.  
8.11—HYDRAULICOILFILTER  
1.  
Stop the engine on vehicle with good battery.  
To prevent damage to the hydraulic system, the  
hydraulic oil filter should be changed after the first 25  
hours of operation and every 250 hours thereafter.  
2.  
Connect one jumper cable to positive terminal on  
good battery. Connect other end of the jumper  
cable to the positive terminal on the dead battery.  
1.  
Remove the old filter and fill new filter with clean  
fluid.  
3.  
Connect one jumper cable to negative terminal on  
good battery. Connect other end of negative  
jumper to ground (frame) of vehicle with dead  
battery.  
2.  
3.  
Install new filter. Hand tighten only.  
Run engine at idle speed with hydrostatic pump in  
neutral for five minutes.  
4.  
Check hydraulic oil level and add if necessary.  
8.14—LUBRICATION  
Refer to “Lubrication” Section, Pages 24 and  
25 of this Maintenance Manual.  
Frequent checks must be made on the oil  
level in the hydraulic system. Should the  
pump run short of oil, immediate and  
permanentdamagewillresult.  
8.15—PAINTING  
For protection and appearance, clean and  
retouch scratched or worn painted surfaces. National  
Mower green and white spray paint cans, in 12-3/4  
ounces, are available at your National Mower Equipment  
Distributor.  
8.12—HANDLE BAR REMOVAL  
For easy removal of handle bars follow this procedure.  
1.  
Cut away rubber coating above steering hub.  
(Shown in diagram) Clean internal threads as  
necessary.  
8.16—BELTREPLACEMENT  
NOTE  
2.  
3.  
Insert 3/8”-24NF X 2" hex head capscrew. (Fully  
threaded if possible).  
To make belt changes easier a belt tool  
kitisavailablethroughNationalMowers  
parts department. (Refer to section 4.3).  
Loosen set screws attaching handle bars to the  
steeringshaft.  
Belts should be inspected regularly, worn or damaged  
belts may cause poor mowing results or disrupt  
operation. If a belt change is necessary follow these  
steps.  
4.  
5.  
Screw capscrew in until handle bars are removed.  
Reinstall handle bars and replace the 2" long  
capscrew with a 3/8”-24NF x 3/8” long capscrew  
to prevent future rusting of steering hub to shaft.  
1.  
Remove the mounting bolts securing the pivot  
bracket on the two front cutting units.  
This bracket is spring loaded. Slowly  
rotate the pivot bracket.  
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BELT REPLACEMENT, Continued  
8.17—COUPLINGALIGNMENT  
To prevent coupling failures proper shaft alignment  
between the pump shaft and engine shaft is  
required. Following these steps will ensure proper  
alignment.  
1, Gently roll the pivot bracket off of the cutting unit.  
Now the belts can easily be removed from the reel  
pulleys.  
2. Remove the top two bolts on the rear cutting unit  
(right side only) pivot bracket. (Noting this bracket  
is under spring pressure). Loosen the bottom bolt  
and use it as a pivot point. Roll back the pivot  
bracket allowing the spring pressure and belt  
tension to be released. (Use of a crescent wrench  
to get extra leverage is very helpful). Remove belt  
from rear cutting unit pulley.  
1.  
2.  
3.  
4.  
Remove flex coupling disk (Part# 591181) from in-  
betweencouplinghalves.  
Rotate both coupling halves to a vertical position to  
check up and down alignment.  
Loosen the four fasteners mounting the hydraulic  
motor to the frame.  
Rotate the hex adjuster (counter clockwise to raise,  
clockwise to lower) to achieve the proper height of  
the hydraulic motor pump shaft. It is recommended  
to check alignment on the rounded surfaces of the  
couplings.  
3. To remove belts from the tractor you must remove  
the left front cover to access the main engine drive  
belts. Remove the front belt guide on the engine  
drive pulley, with clutch disengaged, the two main  
drive belts and the left wing cutting unit belt, can  
nowberemoved.  
5.  
6.  
Tighten hydraulic pump mounting fasteners.  
Recheckalignment.  
4. Removal of the right wing and rear cutting unit belts  
can be done by removing the two capscrews  
holding the bearing mounting bracket in place.  
With capscrews removed rotate the bearing and  
bracket creating space to remove both belts.  
To adjust forward and back alignment, rotate  
couplings 90° to a horizontal position and loosen  
the four fasteners mounting the engine to the  
frame.  
7.  
8.  
Slide engine forward and back until proper  
alignment is achieved. Retighten fasteners.  
For reinstallation of new belts reverse these  
steps. Taking care to tighten all mounting fasteners and  
making sure all belts, pulleys, and pulley scrapers are  
allinalignment.  
Remount coupling disk. (Use of a thread locking  
formula is recommended).  
COUPLING  
HALVES  
HEX  
ADJUSTER  
ROTATEBEARING  
ANDBRACKET  
FORBELTREMOVAL  
REMOVE  
FASTENERS  
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9—STORAGE  
9.4—TRACTOR  
9.1—GENERALINSTRUCTIONS  
Wash, clean and completely lubricate the  
tractor. Paint exposed metal with National Mower paint.  
When you do not plan to use your vehicle for  
some time, it should be stored in a dry and protected  
place. Unnecessary exposure to the elements may  
deteriorate its appearance and shorten the usual service  
life.  
9.5—TIRES  
1.  
2.  
Before storing the vehicle, clean the tires  
thoroughly.  
9.2—ENGINE  
Jack up the vehicle so that the load is off the tires.  
If it is not jacked up, check the tires at regular  
intervals and re-inflate as necessary to keep them  
at the recommended pressure.  
1. Drain the fuel from the fuel tank and carburetor.  
2. Operate the engine until the gasoline in the  
carburetor is completely consumed.  
3.  
Store the vehicle so that tires are protected from  
thesunlight.  
IMPORTANT  
9.6—STARTING THE ENGINE  
AFTER STORAGE  
Gum will eventually form in the tank, fuel  
line, and carburetor if the fuel is not  
drained. Gum in the carburetor jets and  
passage affects engine starting.  
1.  
Check and recharge the battery according to  
recommendations given by battery manufacturer.  
3. While the engine is still warm, drain the oil from the  
crankcase and refill with fresh oil. Refer to the  
engine manual for specific instructions.  
a.Refer to Section 8.3 in this manual.  
b.Reinstallthebattery.  
4. After engine has cooled, remove the spark plugs  
and put about one tablespoon of SAE 30 oil into the  
cylinder.  
2.  
3.  
Check oil level in crankcase and hydraulic oil tank.  
Fill the fuel tank with fresh gasoline. Check fuel  
filter.  
5. Clean exterior of engine. Paint the exposed metal or  
coat it with a light coating of rust preventative oil.  
4.  
Remove the spark plug and wipe dry. Crank the  
engine (with spark plug removed), using starter,  
until excess oil has been expelled through the  
spark plug hole. Replace the plug and connect the  
ignition lead wires.  
9.3—BATTERY  
1. Remove battery and clean it, refer to Manufacturer’s  
manual for specific instructions. Also refer to 8.3  
and 8.4 in the Maintenance Section of this manual.  
5.  
6.  
Before driving the vehicle, check to make certain  
that the tires are properly inflated to the proper  
pressure.  
2. Maintenance-free batteries should be stored in an  
upright position in a cool, dry place. Storage above  
80° F (26.7°C) greatly increases self-discharge. If  
wet batteries are discharged, the electrolyte will  
freeze when stored below 20° F(-7° C).  
Either move the vehicle outside before starting  
engine or keep doors and/or windows wide open to  
provide sufficient ventilation to prevent danger from  
carbon monoxide gas in the exhaust. Start the  
engine but do not operate at high speed  
immediately after starting. Allow time for it to  
become properly warmed and lubricated.  
IMPORTANT  
The battery should be checked every 60  
to 90 days while in storage, and should  
be recharged if necessary.  
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10—TROUBLE SHOOTING GUIDE  
slippage still occurs as a result of belt wear and belt  
stretch, replace the belt.  
10.1—ENGINE WILL NOT START  
Check fuel in tank.  
Check drive belts between engine and countershaft  
pulley. If adjustment is necessary, this can be  
accomplished by adjusting the clevis on the reel  
engagement lever for more tension on the belts. If  
clevis needs to be adjusted beyond the thread length  
available, replacethebelt.  
Check if fuel is at end of fuel line at carburetor.  
If not, clean filter on fuel shutoff on bottom of tank.  
If not, replace fuel filter.  
Check spark plugs.  
Check for spark at spark plug.  
Check for foul condition.  
10.4—REEL WILL NOT CUT  
Replace spark plug if necessary, refer to Briggs  
and Stratton engine manual for recommended  
spark plug number and gap.  
Check reel to bedknife clearance with paper, (common  
newspaper), the reel should cut the entire length of the  
bedknife. If adjustment is necessary adjust clearance by  
turning (equal turns on each side of the reel) hex reel  
adjusters located on each side of the reel. Turn a 1/8  
turn at time, periodically checking with paper.  
Check position of reel engagement lever and  
traction pedal, both must be in disengaged  
(lever) and neutral (pedal) position.  
Check electrical wiring and switch operation.  
Inspect condition of the reel and bedknife and service  
as necessary.  
Check positioning of reel control safety switch and  
traction pedal neutral safety switch. Both must be  
adjusted to allow current flow from the “s” terminal to  
the starter solenoid.  
Refer to Page 26 for circuit diagram.  
Check for continuity of each safety switch.  
Replace switch as required.  
To avoid possible serious injury, before  
making any adjustments or performing  
maintenance, place all controls in  
neutral, fully lower cutting units to the  
ground, turn ignition switch “OFF” and  
remove key.  
Check battery for charge level. Replace or charge if  
necessary.  
Check for corrosion on battery terminals, clean as  
necessary.  
10.2—TRACTOR WILL NOT MOVE  
Disengage parking brake.  
Check towing valve assuring that the valve is totally  
closed.  
Check linkage from traction pedal to the pump  
control mechanism to assure complete attachment of  
alllinkages.  
10.3—REEL NOT TURNING:  
Check for debris jammed between reel and  
bedknife.  
Check for proper belt tension. Tensioning on belts  
for countershaft to reel is non-adjustable. Check the  
condition of the slider shaft (under spring) of the  
push and pull arms for free movement, if necessary  
clean shaft and apply grease to mating surfaces. If  
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11—LUBRICATION  
Item  
Description  
No. of Fittings  
Grease Items 1 through 9 (use pressure gun) every  
40 hours.  
1
2
3
4
5
6
7
8
9
Fork pivot bearing  
1
1
2
9
4
Rear wheel hub bearing  
Handle bar shaft pivot  
Pivotbearings  
Clean fittings and slowly fill until grease begins to  
seep out.  
Push arm brackets  
Reelengagement  
Apply several drops of SAE 30 oil to all linkage friction  
points.  
Neutral control bearing  
Countershaftbearing  
Countershaftbearing  
1
2
24  
HY70OM-8/99  
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®
NATIONAL HYDRO 70" TRIPLEX  
Item  
Description  
No. of Fittings  
1
2
3
4
5
6
7
Reel shaft bearing  
2
2
Grease Items 1 through 7 (use pressure gun) every  
40 hours.  
Reel to bed knife adjuster  
Roller bearing (per cutting unit)  
Roller adj. bracket (per cutting unit)  
Pull arm, rear  
4
4
2
4
4
Clean fittings and slowly fill until grease begins to  
seep out.  
Pull arm, front  
Pull arm bracket  
25  
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12—ELECTRICAL SCHEMATIC  
SEAT  
SWITCH  
(#07332)  
GROUNDWIRE  
(07104)  
REEL CONTROL  
SWITCH(#07325)  
HOURMETER  
(#07063)  
BATTERY  
Yellow  
GRD.  
IGNITIONSWITCH  
(#07065)  
GRD.  
AMMETER  
(#07064)  
STARTER  
SOLENOID  
(#07057)  
TRACTION  
PEDAL  
SWITCH  
(#302533)  
SOLENOIDWIRE  
(#07384)  
30AMPFUSE  
TOGGLE  
SWITCH  
(#07386)  
WIREHARNESS  
(#07328)  
REGULATOR  
STOP  
SWITCH  
ANTIAFTER  
FIRE  
SOLENOID  
STARTER WIRE  
(#07104)  
ENGINE  
STARTER  
NOTE  
THIRDWHEELASSIST  
MODELONLY  
SOLENOID  
VALVE  
(#07395)  
GROUND  
WIRE  
(#07385)  
SOLENOID  
WIRE  
(#07383)  
26  
HY70OM-8/99  
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®
NATIONAL HYDRO 70" TRIPLEX  
PARTS LIST  
Note: For your records and future ordering, fill in the following information.  
DATE PURCHASED  
MODEL NO.  
SERIAL NO.  
ORDERINGINFORMATION  
Whenorderingreplacementparts,alwaysfurnish:  
1. Your complete name, address and phone number.  
2. Model Number and Serial Number (plate located on the main frame  
between the oil tank and the fuel tank).  
3. Part Number (it is recommended that the correct number be verified  
with a current Master Price List).  
4. The full Description of the part.  
5. Quantity desired (quantity shown is the total number of parts con-  
tained in the particular view shown).  
IfthePartNumberandtheDescriptionofyourorderdonotagree,  
the Part Number will be used to fill your order.  
27  
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HY70OM-8/99  
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TANK AND REAR FORK ASSEMBLY  
Qty.  
Item  
Qty.  
Part No.  
Description  
Item  
Part No. Description  
20  
21  
22  
07244  
302669  
07339  
TIREANDWHEELASSEMBLY  
OILTANKASSEMBLY(withFittings)  
OILCAP  
2
1
1
1
2
3
07333  
07258  
04512  
SEAT  
1
1
2
CAP, Bearing  
SPRING,Seat  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
23  
24  
25  
07355  
07101  
07175  
TANKBASE,Rubber  
SLIDE, Seat  
2
1
2
4
5
6
302228  
302133  
06029  
SUPPORT, Seat Spring  
BASE, Seat, (includes #6)  
BUSHING  
1
2
4
CLAMP,FuelLine  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
26  
27  
28  
302678  
07068  
07349  
FUELLINE  
1
1
1
7
8
9
07260  
CAP, Gas  
TANK, Gas (includes #27)  
SPRING  
1
1
1
VALVE,FuelShutoff  
SCREEN, Oil Tank  
302607  
302638  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
29  
30  
31  
07424  
07425  
07427  
TIRE, Rear (Tire Only)  
RIM  
1
1
1
10  
11  
12  
302552  
302551  
302162  
STRAP,Rubber  
STRAP,Tank  
BASE,Spring  
4
4
1
STEM,Valve  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
*32  
*33  
*34  
302560  
07389  
07387  
FORK  
1
1
1
13  
06130  
06131  
302070  
CONE,Bearing  
CUP,Bearing  
FRAME  
2
2
1
TIREANDWHEELASSEMBLY  
HUB  
14  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
*35  
*36  
*37  
07390  
MOTOR,Wheel  
BRACKET,Fitting  
BRACKET, Hoses  
1
1
1
15  
16  
17  
302043  
302068  
07318  
FORK  
1
1
1
302620  
302687  
SPACER, Rear Wheel  
HUB, Rear Wheel  
__________________________________________________________________________________________________________________________________________________  
__________________________________________________________________________________________________________________________________________________  
*38  
*39  
07426  
07269  
RIM  
BOLT, Wheel  
1
1
18  
19  
302067  
302069  
SPACER, Rear Wheel  
AXLE, RearWheel  
1
1
* Three Wheel Drive  
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HY70OM-8/99  
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STEERING TOWER ASSEMBLY  
Qty.  
Item  
Qty.  
Part No.  
Description  
Item  
Part No. Description  
20  
21  
07408  
302051  
DECAL,Instruction  
ARM,Steering  
1
1
1
2
09114  
302566  
COVER, Tower  
HANDLEBAR  
1
1
22 04011 RING,Snap  
___________________________________________________________________________________________________________________________________________________  
1
_______3_______________0__7__2___4__1________________C___O____N___T__R___O____L__,__T__h___r_o___t_t_l_e____________________________________________________________1_____  
23  
24  
302743  
04074  
TUBE, Steering  
END, Rod  
1
2
4
5
04012  
06030  
KEY,Woodruff  
BUSHING  
2
2
25 07372 DECAL, CE  
___________________________________________________________________________________________________________________________________________________  
1
_______6_______________0__4__0___7__3________________C___L___E__V___I_S____A___N___D___P___I_N__________________________________________________________________1_____  
26  
27  
04544  
302659  
SPRING  
SPACER, Spring  
1
1
7
8
07364  
302205  
CLAMP,Cable  
LEVER  
1
1
28 07242 CONTROL, Choke  
___________________________________________________________________________________________________________________________________________________  
1
_______9_______________0__7__0___0__7________________G___R___I_P________________________________________________________________________________________1_____  
29  
30  
07407  
07353  
DECAL, Dash  
COVER, Switch  
1
1
10  
11  
200676  
07325  
SPACER  
SWITCH  
1
1
31 07404 DECAL, Noise, LWA  
___________________________________________________________________________________________________________________________________________________  
1
_____1__2_______________3__0__2___2__0__8______________R___O____D___,__L__e__v___e__r__________________________________________________________________________1_____  
32  
33  
07405  
07406  
DECAL,LPA  
DECAL,Slope  
1
1
13  
14  
07065  
302041  
SWITCH,Ignition  
TOWER (includes #5)  
1
1
34 07403 DECAL,ParkingBrake  
___________________________________________________________________________________________________________________________________________________  
1
_____1__5_______________0__7__2__4___9________________G___R___O___M____M___E___T____________________________________________________________________________1_____  
35  
*36  
07457  
07386  
GRIP,HandleBar  
SWITCH, 3 WD  
2
1
16  
17  
302070  
07346  
FRAME  
LEVER,Brake  
1
1
*37 07490 DECAL, Dash  
1
_____1__8_______________0__7__3__4__7_________________C___A___B___L__E___,__B__r__a__k__e___,_R____._H___.__________________________________________________________1_____  
19 07348 CABLE,Brake,L.H.  
__________________________________________________________________________________________________________________________________________________  
1
* Three Wheel Drive  
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HY70OM-8/99  
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ENGINE AND FOOTREST ASSEMBLY  
Qty.  
Item  
Part No.  
Description  
Item  
Part No. Description  
Qty.  
20  
21  
22  
07262  
07257  
302092  
NON-SKID,L.H.  
DECAL,Up  
1
1
1
1
2
3
09158  
COVER  
FRAME  
KEY  
1
1
1
302070  
202436  
PLATE,Mounting  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
23  
24  
25  
302096  
302095  
07252  
SHROUD,L.H.  
SHROUD,R.H.  
1
1
1
4
5
6
302745  
591181  
302744  
COUPLER, Pump  
DISK,Coupler  
1
1
1
DECAL,NationalMowerCompany  
COUPLER,Engine  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
26  
27  
28  
302064  
07261  
07270  
FOOTREST, R.H.  
NON-SKID,R.H.  
FAN  
1
1
1
7
8
9
302437  
302093  
302359  
KEY  
1
1
1
FRONT PLATE, Air Duct  
AIRBOX  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
29  
30  
31  
302557  
07360  
07399  
GUARD,Muffler  
CLAMP  
1
1
2
10  
11  
12  
302301  
08061  
HEATSHIELD  
GUIDE,Belt  
BRACKET,BeltGuide  
1
2
1
KNOB  
302699  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
32  
33  
34  
302623  
07430  
07433  
STOP, Pedal  
1
1
1
13  
14  
15  
302435  
03628  
03928  
KEY  
PULLEY  
1
1
2
CLAMP,Muffler,1-1/8”  
CLAMP,Muffler,1-1/4”  
BELT (Gates 6840)  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
35  
36  
302706  
GUIDE,Hose  
ENGINEANDPARTS  
(Order Through Briggs & Stratton)  
1
1
16  
17  
18  
302128  
494664  
07256  
PIPE,Exhaust  
MUFFLER  
1
1
1
DECAL, Down  
__________________________________________________________________________________________________________________________________________________  
__________________________________________________________________________________________________________________________________________________  
19  
302065  
FOOTREST, L.H.  
1
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HY70OM-8/99  
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TRACTION PEDAL AND PUMP ASSEMBLY  
Qty.  
Qty.  
Item  
Part No.  
Description  
Item  
Part No. Description  
21  
22  
23  
302479  
06129  
04075  
ARM  
1
1
2
1
2
3
09128  
07263  
302533  
PEDAL,Traction  
1
1
1
BEARING,Ball  
END, Rod  
NON-SKID,Pedal  
SWITCHASSEMBLY  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
24  
25  
26  
08068  
04539  
302480  
ROD  
SPRING  
1
1
1
4
5
6
07248  
07275  
07272  
GROMMET  
CYLINDER,Lift  
PUMP  
1
1
1
CONTROL, Pump  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
27  
28  
29  
04069  
06126  
302150  
KEY  
1
6
1
7
8
9
302156  
07264  
07240  
PEDAL,Lift  
1
2
1
BLOCK, Bearing  
PIVOT,Pedal  
NON-SKID,Pedal,Left  
LINK  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
30  
31  
32  
302703  
07360  
07364  
BRACKET, Switch  
CLAMP,Cable  
CLAMP,Cable  
1
1
1
10  
11  
12  
07274  
302070  
07276  
VALVE,Lift  
FRAME  
1
1
1
OILFILTERASSEMBLY  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
33  
34  
35  
07394  
302624  
07410  
BLOCK, 2WD  
SPACER  
1
4
1
07277  
07278  
07388  
HEAD, OilFilter  
ELEMENT,OilFilter  
MOTOR,Wheel  
1
1
2
TIRE, Front (Tire Only)  
13  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
36  
37  
38  
07425  
07427  
302791  
RIM  
1
1
2
14  
15  
16  
07350  
07351  
07352  
CALIPER,R.H.  
CALIPER,L.H.  
ROTOR  
1
1
2
STEM,Valve  
KIT, Brake Pad  
__________________________________________________________________________________________________________________________________________________  
__________________________________________________________________________________________________________________________________________________  
39  
40  
302855  
302884  
07395  
HEXADJUSTER,Pump  
WASHER,Plated  
BLOCK 3WD  
1
1
1
17  
18  
19  
07269  
07243  
06036  
BOLT, Wheel  
10  
2
1
TIRE&WHEELASSEMBLY  
BUSHING  
*41  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
20  
06037  
BEARING,Thrust  
1
* Three Wheel Drive  
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HY70OM-8/99  
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LIFT ARM AND DRIVE ASSEMBLY  
Qty.  
Item  
Part No.  
Description  
Item  
Part No. Description  
Qty.  
15  
16  
17  
03630  
04012  
302172  
PULLEY  
KEY,Woodruff  
3
3
1
1
2
3
302076  
07458  
ARM,Lift  
1
1
6
CHAIN* Three Wheel Drive (5 Links)  
SUPPORT,Bearing  
ARM, Push (includes #21)  
302325  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
18  
19  
20  
302227  
05073  
06125  
SHAFT  
1
1
2
4
5
6
06127  
302161  
04540  
BLOCK, Bearing  
STRAP,Lift  
12  
1
1
SHAFT, Push Arm  
BEARING,PillowBlock  
SPRING,BeltIdler  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
21  
06032  
06124  
302360  
BUSHING  
BEARING,Flange  
SCRAPER,Pulley  
4
1
3
7
8
9
302070  
302082  
07365  
FRAME  
ARM,Idler  
CHAIN  
1
1
4
23  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
24  
25  
26  
302114  
04073  
BRACKET  
CLEVISANDPIN  
ROD, Lift Link  
1
2
1
10  
11  
12  
03631  
06038  
302169  
PULLEY,Idler  
1
3
1
BEARING,Thrust  
ARM, Push(Includes#21)  
302702  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
27  
28  
07265  
302611  
CHAIN(6Links)  
SPACER  
1
2
13  
14  
03629  
302455  
PULLEY  
BAR,Lift  
1
1
* Three Wheel Drive  
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HY70OM-8/99  
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FRONT CUTTING UNIT ASSEMBLY  
Qty.  
Qty.  
Item  
Part No.  
Description  
Item  
Part No.  
Description  
302905  
302829  
SKIDBAR,L.H.  
FRAME,CuttingUnit,R.H.  
1
1
1
302840  
302841  
SIDEPLATE,L.H.  
SIDEPLATE,R.H.  
1
1
26  
302828 FRAME,CuttingUnit,L.H.  
1
___________________________________________________________________________________________________________________________________________________  
2
03606  
PULLEY  
1
___________________________________________________________________________________________________________________________________________________  
27  
28  
302491  
302738  
REEL, 6 Blade  
REEL, 8 Blade  
1
1
3
302827  
302826  
BRACKET, Rear Roller, L.H.  
BRACKET, Rear Roller, R.H.  
1
1
29 201437 WASHER, Backup  
1
___________________________________________________________________________________________________________________________________________________  
4
302336  
SHAFT  
1
___________________________________________________________________________________________________________________________________________________  
30  
31  
06120  
06121  
CUP,Bearing  
CONE,Bearing  
BRACKET, Rear Roller, R.H.  
2
2
1
5
6
302360  
302601  
04521  
SCRAPER,Pulley  
SLEEVE,Rubber  
SPRING  
1
1
1
302836  
___________________________________________________________________________________________________________________________________________________  
7
___________________________________________________________________________________________________________________________________________________  
302838  
200236  
BRACKET, Rear Roller, L.H.  
ADJUSTER,Reel  
SPRING,ReelAdjuster  
1
2
2
8
9
04077  
04071  
02644  
END, Rod  
RING,Snap  
WASHER  
2
1
3
32  
33  
04542  
10  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
34  
302549  
302550  
REEL CARRIER, R.H.  
REELCARRIER, L.H.  
1
1
11  
12  
302639  
302171  
CROSSLINK  
PULLARM(includes#13)  
1
1
35  
05075  
ADJUSTER,HexReel  
2
___________________________________________________________________________________________________________________________________________________  
13  
06035  
BUSHING  
1
___________________________________________________________________________________________________________________________________________________  
36  
37  
06119  
302507  
BEARING,Roller  
ROLLER, Rear (includes #38)  
4
1
14  
302185  
302186  
PLATE,Side,R.H.  
PLATE,Side,L.H.  
1
1
38 05078 PIN,Roller  
2
__________________________________________________________________________________________________________________________________________________  
15  
05072  
SPACER  
1
__________________________________________________________________________________________________________________________________________________  
39  
40  
06119  
302181  
BEARING  
SHIELD  
4
1
16  
17  
05080  
302846  
SHAFT,FrontRoller  
ADJUSTER,Roller(Shown)  
1
2
41 302659 SLEEVE  
2
___________________________________________________________________________________________________________________________________________________  
302847  
ADJUSTER,Roller  
2
___________________________________________________________________________________________________________________________________________________  
42  
43  
04543  
302179  
SPRING  
CROSSBAR  
1
1
18  
19  
201802  
302310  
NUT  
BEDKNIFE  
8
1
44 03929 BELT,BX-58  
1
___________________________________________________________________________________________________________________________________________________  
20  
02109  
SCREW, Bedknife  
8
___________________________________________________________________________________________________________________________________________________  
45  
46  
302513  
302653  
ROLLER (includes No's. 16, 21–23, 46  
CAP, End  
1
2
21  
22  
302504  
02641  
SPACER  
WASHER  
17  
16  
47 09173 GUARD,Reel  
1
___________________________________________________________________________________________________________________________________________________  
23  
02272  
NUT,Roller  
2
___________________________________________________________________________________________________________________________________________________  
48  
49  
200256  
07437  
SCREW and NUT  
DECAL, Hydro70  
2
1
24  
25  
302311  
302904  
BEDBAR&KNIFEASSEMBLY  
SKIDBAR,R.H.(Shown)  
1
1
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CENTER (REAR) CUTTING UNIT ASSEMBLY  
Qty.  
Item  
Part No.  
Description  
Qty.  
Item  
Part No.  
Description  
1
2
302820  
302840  
CROSSBAR  
SIDEPLATE,L.H.  
1
1
28  
29  
302248  
302511  
ARM, Pull(includes#47)  
PLATE,Side  
1
1
3
302491  
REEL, 6 Blade  
1
___________________________________________________________________________________________________________________________________________________  
____3__0_______________3__0__2___3__6__0______________S___C___R___A___P___E___R___,_P___u___l_l_e__y_______________________________________________________________1______  
4
5
302738  
06120  
REEL, 8 Blade  
CONE,Bearing  
1
2
31  
32  
201383  
302836  
CAPSCREW  
BRACKET, Rear Roller  
1
1
06121  
CUP,Bearing  
2
___________________________________________________________________________________________________________________________________________________  
____3__3_______________0__3__6__0___6________________P___U___L__L__E___Y__________________________________________________________________________________1______  
6
7
201437  
302838  
WASHER, Backup  
BRACKET, Rear Roller  
1
1
34  
35  
302847  
06119  
ADJUSTER,Roller  
BEARING  
2
1
8
302245  
BRACKET, Pull Arm  
1
___________________________________________________________________________________________________________________________________________________  
____3__6_______________2__0__0___2__3__6______________A___D___J__U___S___T___E__R___,__R___e___e__l_______________________________________________________________1______  
9
10  
04077  
302639  
END, Rod  
ROD, Pull  
2
1
37  
38  
04542  
05075  
SPRING,ReelAdjuster  
ADJUSTER,HexReel  
2
2
11  
05072  
SPACER  
1
___________________________________________________________________________________________________________________________________________________  
____3__9_______________3__0__2___5__0__7______________R___O___L___L__E___R___,__R___e___a__r__(__i_n__c__l_u___d__e__s___#___4__0___)________________________________________2______  
12  
13  
302830  
302311  
FRAME,CuttingUnit  
BEDBAR&KNIFEASSEMBLY  
1
1
40  
41  
05078  
302181  
PIN,Roller  
SHIELD  
1
1
14  
302846  
ADJUSTER,Roller  
2
___________________________________________________________________________________________________________________________________________________  
___4___2_______________3__0__2__8___4__2______________P___L__A___T___E___,_S___i_d___e__,__R___._H___.______________________________________________________________1______  
15  
16  
05080  
201802  
SHAFT,Roller  
NUT,Bedbar  
1
8
43  
44  
302401  
302658  
GUARD,Rear  
SLEEVE  
1
1
17  
02109  
SCREW, Bedbar  
8
__________________________________________________________________________________________________________________________________________________  
___4___5______________0___4__5__4__4_________________S__P___R___I_N___G__________________________________________________________________________________1______  
18  
19  
302310  
302504  
BEDKNIFE  
SPACER  
1
17  
46  
302273  
302272  
CARRIER,Reel,R.H.  
CARRIER,Reel,L.H.  
1
1
20  
02641  
WASHER  
16  
___________________________________________________________________________________________________________________________________________________  
___4___7_______________0__6__0__3__5_________________B___U__S___H___I_N___G________________________________________________________________________________2______  
21  
22  
02272  
04541  
NUT,RollerShaft  
SPRING  
2
1
48  
49  
03930  
302653  
BELT,BX-38  
CAP, End  
1
2
23  
302252  
PULLARM(includes#25)  
1
___________________________________________________________________________________________________________________________________________________  
___5___0_______________3__0__2__5___1__3______________R___O___L___L__E___R____(_i_n___c__l_u__d___e__s___#__1___5__,__1___9__-_2___1__,__4___9__)________________________________2______  
24  
25  
302255  
06031  
SLEEVE  
BUSHING  
1
1
51  
52  
302680  
302681  
REELGUARDASSEMBLY,R.H.  
REELGUARDASSEMBLY,L.H.  
1
1
26  
04071  
RING,Snap  
1
___________________________________________________________________________________________________________________________________________________  
___5___3_______________2__0__0__2___5__6______________S___C___R___E___W_____A__N___D____N___U___T_______________________________________________________________1______  
27  
02644  
WASHER  
3
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PUMP  
WHEEL  
MOTOR  
FILTER  
LIFT  
CYLINDER  
TANK  
NEEDLE  
VALVE  
LIFT  
VALVE  
WHEEL  
MOTOR  
REAR  
WHEEL  
MOTOR  
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HYDRAULICHOSEANDLINEASSEMBLY  
Qty.  
Item  
Part No.  
Description  
Item  
Part No. Description  
Qty.  
1
2
3
07303  
07309  
07310  
HOSE,Motor  
3
1
1
12  
13  
14  
07304  
07308  
07302  
HOSE,LiftCylinder  
LINE, CaseDrain  
HOSE, Case Drain, L.H.  
1
1
1
LINE, Pump to Tee  
LINE, Pump to Tee  
________________________________________________________________________________________________________________________________________________________  
4
5
6
07299  
07306  
07311  
HOSE, Case Drain, R.H.  
LINE, CaseDrain  
1
1
1
15  
16  
17  
07377  
07378  
07305  
LINE, Tee to Block  
LINE, Tee to Block  
HOSE,Motor  
1
1
1
LINE, Pump to Filter  
________________________________________________________________________________________________________________________________________________________  
7
8
9
07307  
07300  
07375  
LINE, Tank to Pump  
HOSE,Suction  
1
1
1
*18  
*19  
*20  
07380  
07379  
07382  
LINE,BlocktoBulkhead  
LINE,BlocktoBulkhead  
HOSE,BulkheadtoBulkhead  
1
1
2
LINE,PumptoValve  
________________________________________________________________________________________________________________________________________________________  
10  
11  
07376  
07301  
LINE,FiltertoValve  
HOSE,LiftCylinder  
1
1
*21  
*22  
07381  
302688  
HOSE, RearMotor  
SLEEVE,Hoses  
2
1
* Three Wheel Drive  
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PUMP  
WHEEL  
MOTOR  
FILTER  
LIFT  
CYLINDER  
TANK  
NEEDLE  
VALVE  
LIFT  
VALVE  
WHEEL  
MOTOR  
REAR  
WHEEL  
MOTOR  
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HYDRAULICFITTINGASSEMBLY  
Qty.  
Item  
Part No.  
Description  
Item  
Part No. Description  
Qty.  
17  
18  
19  
07293  
07292  
07281  
NIPPLE  
1
2
2
1
2
3
07283  
07284  
07297  
FITTING,Reducer  
FITTING,Straight  
FITTING,45°  
2
2
2
FITTING,90°  
ADAPTER,Straight  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
20  
21  
22  
07388  
07275  
07277  
MOTOR,Wheel  
CYLINDER,Lift  
HEAD,Filter  
2
2
1
4
5
6
07285  
07286  
07272  
FITTING,Straight  
FITTING,90°  
4
2
1
PUMP,Hydraulic  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
23  
24  
25  
07278  
07298  
07295  
CARTRIDGE,Filter  
FITTING,Tee  
1
2
1
7
8
9
07287  
07288  
07369  
FITTING,90°  
1
1
2
FITTING,Straight  
FITTING,45°  
FITTING,90°  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
26  
27  
28  
07282  
07357  
07391  
FITTING,Tee  
FITTING,90°  
1
1
4
10  
11  
12  
07356  
07290  
07291  
FITTING,90°  
FITTING,90°  
1
1
1
FITTING,Straight  
FITTING,Straight  
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
*29  
*30  
*31  
07393  
07392  
07412  
FITTING,StraightBulkhead  
FITTING,90°Bulkhead  
FITTING,Straight  
3
1
2
13  
14  
15  
07341  
07317  
07316  
FITTING,Plug  
GAUGE,Sight  
SCREEN,Tank  
1
1
1
___________________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
*32  
07390  
MOTOR,Wheel  
1
16  
07279  
VALVE,Needle  
1
* Three Wheel Drive  
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BASKET ASSEMBLY – Kit No. 070001  
Item  
Part No.  
Description  
Qty.  
1
2
07337  
BASKET,Rear  
HANGER  
1
1
1
1
1
302526  
3
4
5
_______________________3__0_2_5__6_2__________________________________________________________________________________________________________  
SHIELD,RearCuttingUnit  
302527  
302528  
BRACKET, Basket  
BRACKET, Basket  
6
_______________________3__0_2_3_9__0_________________________________________________________________________________________________________  
SHIELD,FrontThrow  
BRACKET, Basket  
BASKET, Front  
2
7
8
302529  
07338  
1
2
1
1
6
1
9
10  
11  
12  
_______________________3__0_2_3__8_3__________________________________________________________________________________________________________  
BRACKET, Basket  
302525  
07499  
04080  
HANGER  
BUSHING  
COTTER,Hairpin  
BELT TOOL KIT – KIt No. 070008  
46  
HY70OM-8/99  
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®
NATIONAL HYDRO 70" TRIPLEX  
HEIGHT OF CUT BAR – Kit No. 070009  
Qty.  
Part No.  
Description  
Item  
Qty.  
Item Part No.  
Description  
1
2
3
02129  
02128  
302214  
SCREW,Machine  
CAPSCREW,HexHead  
CHANNEL  
1
1
1
4
5
302654  
02282  
DECAL  
NUT,Wing  
1
2
_________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
PUMP – Part No. 07272  
Qty.  
Part No.  
Description  
Item  
Qty.  
Item Part No.  
Description  
1
2
3
302760  
302761  
302763  
SNAPRING  
2
1
1
4
5
302762  
302759  
SEAL  
SHAFT,Input  
1
1
RING,Retaining  
BEARING,input  
_________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
47  
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WHEEL MOTOR – Part No's. 07273, 07388 07390  
Qty.  
Part No.  
Description  
Item  
Qty.  
Item Part No.  
Description  
4
5
302717  
302714  
NUT,Hex  
SEALKIT  
1
1
1
2
302718  
302715  
KEY  
1
1
BEARINGHOUSING  
3
302716  
SHAFT&BEARINGKIT  
1
_________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
LIFT VALVE – Part No. 07274  
Qty.  
Part No.  
Description  
Item  
Qty.  
Item Part No.  
Description  
4
5
6
302728  
302729  
302730  
RETAINER  
O'RING  
2
1
1
1
2
3
302725  
302726  
302727  
SHIM,Mylar  
O'RINGKIT  
BALL  
AR  
1
2
O'RING  
_________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
48  
HY70OM-8/99  
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®
NATIONAL HYDRO 70" TRIPLEX  
LIFT CYLINDER – Part No. 07275  
Qty.  
Part No.  
Description  
Item  
Qty.  
Item Part No.  
Description  
4
5
6
302712  
302713  
NA  
PISTON  
1
1
1
1
2
3
302709  
302711  
302710  
SHAFTWELDMENT  
SEALKIT  
GLAND,End  
1
1
1
LOCKNUT,1/2"–13UNC  
TUBEWELDMENT  
_________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
FRONT ROLLER SCRAPER KIT – Part No. 070005  
Qty.  
Part No.  
Description  
Item  
Qty.  
Item Part No.  
Description  
4
5
02302  
302692  
WASHER,Lock  
SCRAPER,Roller  
12  
3
1
2
302693  
02012  
HANGER  
CAPSCREW,HexHead  
6
12  
6
02205  
NUT,Full  
6
_____3_______________0__2___4___0__2_______________________W_____A___S___H____E___R____,__F___l_a___t__________________________________________1___2________  
___________________________________________________________________________________________________________________________________________________  
49  
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REAR ROLLER SCRAPER KIT – Part No. 070013  
Qty.  
Part No.  
Description  
Item  
Qty.  
Item Part No.  
Description  
3
4
09169  
302865  
CABLE, RollerScraper  
ADJUSTER,RearRoller  
3
3
1
2
302864  
02228  
ADJUSTER,RearRoller  
NUT,Jam  
3
12  
VALVE BLOCK – Part No. 07395  
Qty.  
Part No.  
Description  
Item  
Qty.  
Item Part No.  
Description  
5
6
7
302723  
302724  
302721  
CARTRIDGE, Valve, 3WD  
COIL, Valve, 3 WD  
1
1
1
1
2
302719  
302720  
N/A  
VALVE,Needle  
SEALKIT  
BLOCK,Valve  
1
1
1
SPOOL, Valve, 3WD  
3
_________________________________________________________________________________________________________________________________________  
___________________________________________________________________________________________________________________________________________________  
4
302722  
SEAL KIT, 3 WD  
1
50  
HY70OM-8/99  
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®
NATIONAL HYDRO 70" TRIPLEX  
NATIONAL MOWER COMPANY  
ONEYEAR  
LIMITED WARRANTY  
For the period of one year from the date of purchase (45 days if the product  
is used for rental purposes), National Mower Company will repair or replace free  
of charge, for the original purchaser, any part or parts found by inspection to be  
defective by our Factory Authorized Service Station or by the Factory at St. Paul,  
Minnesota to be defective in material or workmanship or both. All transportation  
charges on parts submitted for repair or replacement under this warranty shall be  
paid for by the purchaser.  
Thiswarrantydoesnotincludeengines,enginepartsortireswhicharecovered  
under separate warranties furnished by their manufacture or supplier.  
AllserviceunderthiswarrantywillbefurnishedandperformedbyourFactory  
Authorized Service Stations.  
-THERE IS NO OTHER EXPRESS WARRANTY-  
IMPLIEDWARRANTIES,INCLUDINGTHOSEOFMERCHANTABILITYAND  
FITNESSFORAPARTICULARPURPOSE, ARELIMITEDTOONEYEAR  
FROM PURCHASE OR 45 DAYS IF THE PRODUCT IS RENTED AND TO THE  
EXTENT PERMITTED BY LAW, ANY AND ALL IMPLIED WARRANTIES ARE  
EXCLUDED. THE ABOVE REMEDY OF REPAIR AND REPLACEMENT OF  
DEFECTIVE PARTS IS THE PURCHASER’S EXCLUSIVE REMEDY FOR ANY  
DEFECT,MALFUNCTIONORBREACHOFWARRANTY.LIABILITYFOR  
INCIDENTALORCONSEQUENTIALDAMAGESUNDERANYANDALL  
WARRANTIES IS EXCLUDED TO THE EXTENT PERMITTED BY LAW.  
NATIONAL MOWER COMPANY  
700 Raymond Avenue, St. Paul, Minnesota 55414, U.S.A.  
51  
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