Hayter Mowers 71620 User Manual

OWNER  
6" and 8"  
Chipper  
OPERATOR’S  
MANUAL  
Models  
74824  
8" 24 HP Chipper with  
Hydraulic Feed  
72620  
6" 20 HP Chipper with  
Hydraulic Feed  
71620  
6" 20 HP Chipper  
Crary Company  
A Division of TerraMarc Industries  
237 12th St. NW • P.O. Box 849  
West Fargo, ND 58078-0849  
(701)282-5520 • FAX: (701)282-9522  
Manual P/N 13987-00  
Rev. 02/03  
Companion to 13988-00  
Limited Warranty  
Crary Bear Cat chippers are warranted for 1 year from date of sale for consumers , commercial, or rental  
operations.  
Within the above stated period, Crary Co. will replace any part(s) found to be defective in material and/or  
workmanship, after the receipt of the part in our plant. Labor costs to replace these defective parts will be  
paid at a Crary established labor rate and time allowed (flat rate) for repair. All transportation charges  
incurred in shipping part(s) are the responsibility of the purchaser.  
This warranty is void in the case of accidents, failure to perform normal maintenance, or failure to follow  
those instructions listed in the service manual. This warranty is also in lieu of all other expressed warranties  
and voids any implied warranty as to the merchantability or fitness of the product for a particular purpose  
and of any other obligation on the part of Crary Co. Some states do not allow limitations on how long the  
implied warranty lasts, so the above limitation may not apply to you.  
This warranty applies only to parts or components that are defective, and does not cover necessary repair  
due to normal wear, misuse, accidents, or lack of proper maintenance. This includes belts, pulleys, and  
chipper blades. Regular routine maintenance of the unit to keep it in proper operating condition is the  
responsibility of the owner.  
All warranty repair reimbursable under the Crary Co. warranty must be performed by an authorized Bear  
Cat service dealer using Bear Cat approved replacement parts. Repair or attempted repair by anyone other  
than an authorized Bear Cat service dealer is not reimbursable under the Crary Co. warranty. In addition,  
these unauthorized repair attempts may result in additional malfunction, the correction of which is not  
covered by warranty.  
Crary Co. is not liable for indirect, incidental, or consequential damages in connection with the use of this  
product including any cost or expense or providing substitute equipment or service during periods of  
malfunction or non-use.  
Some states do not allow the exclusion of incidental or consequential damages, so the above exclusion  
may not apply to you. This warranty gives you specific legal rights. You may also have other rights that  
vary from state to state.  
Be sure to note the serial number in any correspondence with Crary Co. or any authorized Bear Cat dealer.  
Crary Company  
A Division of TerraMarc Industries  
237 12th St. NW • P.O. Box 849  
WestFargo, ND58078-0849  
(701)282-5520FAX:(701)282-9522  
6" & 8" Bear Cat Chipper Operator’s Manual  
II  
CONTENTS  
SAFETY ..........................................................................................................................................................................1  
1.1 THE SAFETY ALERT SYMBOL ................................................................................................................................1  
1.2 BEFORE OPERATING .............................................................................................................................................. 1  
1.3 BEFORE OPERATING .............................................................................................................................................. 2  
1.4 OPERATION SAFETY ...............................................................................................................................................2  
1.5 MAINTENANCE AND STORAGE SAFETY ............................................................................................................... 3  
1.6 TOWING SAFETY.....................................................................................................................................................3  
1.7 BATTERY SAFETY ................................................................................................................................................... 3  
ASSEMBLY ....................................................................................................................................................................4  
2.1 ASSEMBLING THE MACHINE .................................................................................................................................. 4  
2.2 INSTALLING THE BATTERY ......................................................................................................................................5  
CONTROLS ....................................................................................................................................................................6  
3.1 MACHINE CONTROLS.............................................................................................................................................. 6  
OPERATION ................................................................................................................................................................... 7  
4.1 STARTING THE MACHINE ........................................................................................................................................ 7  
4.2 STOPPING THE ENGINE.......................................................................................................................................... 8  
4.3 CHIPPING .................................................................................................................................................................8  
4.4 ROTATING THE CHIPPER BASE .............................................................................................................................. 8  
4.5 HYDRAULIC FEED OPERATION (MODELS 72620 & 74824) .................................................................................... 9  
4.6 CONTROLARM OPERATION (MODELS 72620 & 74824) .........................................................................................9  
4.7 HYDRAULIC FEED COMPONENT LOCATIONS (MODELS 72620 & 74824) ............................................................ 9  
SERVICE & MAINTENANCE ......................................................................................................................................... 10  
5.1 SHARPENING CHIPPER BLADES ......................................................................................................................... 10  
5.2 SETTING CHIPPER BLADE CLEARANCE.............................................................................................................. 11  
5.3ADJUSTING DRIVE BELTS ..................................................................................................................................... 11  
5.4 REPLACING DRIVE BELTS .................................................................................................................................... 12  
5.5 CLEARING PLUGGED ROTOR ............................................................................................................................... 12  
5.6 REPAIRING OR REPLACING ROTOR BEARINGS.................................................................................................. 13  
5.7 GREASEABLE BEARINGS AND PIVOTS .............................................................................................................. 13  
5.8 OTHER SERVICE TIPS........................................................................................................................................... 13  
5.9 TRAILER SERVICE TIPS ........................................................................................................................................ 13  
5.10 HYDRAULIC FLUID (MODELS 72620 & 74824) ..................................................................................................... 14  
5.11 PUMP COMPONENT LOCATIONS (MODELS 72620 & 74824) ............................................................................. 14  
5.12 HYDROSTATIC PUMP STARTUP PROCEDURE (MODELS 72620 & 74824)........................................................ 14  
5.13 HYDRAULIC FEED MAINTENANCE (MODELS 72620 & 74824) ........................................................................... 15  
5.14 ADDING HYDRAULIC FLUID........................................................................ .................................................... 15  
TROUBLESHOOTING .................................................................................................................................................. 16  
6.1 GENERAL TROUBLESHOOTING............................................................................................................................ 16  
6.2 HYDROSTATIC PUMP TROUBLESHOOTING (MODELS 72620 & 74824) ............................................................... 17  
SPECIFICATIONS ........................................................................................................................................................ 18  
7.1 SPECIFICATIONS ................................................................................................................................................... 18  
7.2 BOLTTORQUE ....................................................................................................................................................... 19  
III  
6" & 8" Chipper Bear Cat Operator’s Manual  
1
Safety  
Section  
1.1 THE SAFETY ALERT SYMBOL  
This is the safety alert symbol. It is used in this Owner / Operator’s Manual and on your machine  
to alert you to potential hazards.  
Whenever you see this symbol, read and obey the safety message that follows it. Failure to obey  
the safety message could result in personal injury, death or property damage.  
Indicates an imminently hazardous situation that, if not avoided, will result in  
death or serious injury.  
DANGER  
Indicates a potentially hazardous situation that, if not avoided, could result in  
death or serious injury.  
WARNING  
CAUTION  
Indicates a potentially hazardous situation that, if not avoided, may result in  
minor or moderate injury.  
4. Familiarize yourself with all of the  
safety and operating decals on this  
equipment and on any of it’s at-  
tachments or accessories.  
7. Do not run this equipment in an  
enclosed area. Do not operate this  
equipment in or near buildings,  
windows, or air conditioners.  
1.2 BEFORE OPERATING  
5. Do not allow children or any per-  
son unfamiliar with the use of the  
unit to use this machine.  
8. If needed, always use an approved  
fuel container. Keep open flames,  
sparks, smoking materials, and  
other sources of combustion away  
from fuel.  
6. Keep the area of operation clear of  
all persons, particularly small chil-  
dren. Keep bystanders at least  
50 feet (15 meters) away from the  
area of operation.  
1. Read this Owner / Operator’s  
manual. Be completely familiar  
with the controls and the proper  
use of this equipment.  
9. Do not operate this machine if you  
are under the influence of alcohol,  
medications, or substances that  
can affect your vision, balance, and  
judgement. Do not operate if tired  
or ill. You must be in good health  
to operate this machine safely.  
2. Before inspecting or servicing any  
part of the machine, wait for all  
parts to stop moving. Be aware that  
rotating parts slow down gradually  
after power is stopped.  
3. Keep safety decals clean and leg-  
ible. Replace missing or illegible  
safety decals.  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 1  
Safety  
1.3 BEFORE OPERATING  
10. Wear safety glasses at all times  
while operating this machine.  
11. Use only in daylight or good artifi-  
cial light.  
cured before starting the machine.  
Check all screws, nuts, bolts, and  
other fasteners for proper tightness  
to ensure everything is in proper  
working condition once every 10  
hours of operation.  
12. Never use without proper guards  
in place.  
13. Avoid wearing loose fitting cloth-  
ing. Never operate this machine  
wearing clothing with drawstrings  
that could wrap around or get  
caught in the machine.  
15. Keep all guards, deflectors, and  
shields in place and in good work-  
ing condition.  
16. Do not transport or move machine  
while the machine is running.  
14. Check that all screws, nuts, bolts,  
and other fasteners are properly se-  
1.4 OPERATION SAFETY  
8. Set up your work site so you are  
not endangering traffic and the pub-  
lic. Take great care to provide ad-  
equate warnings.  
3. Shut off machine immediately if the  
cutting mechanism strikes any for-  
eign object or the machine starts  
making an unusual noise or vibrat-  
ing. Allow the machine to stop  
completely. After machine stops:  
WARNING  
Material can kickup or shift suddenly  
and cause serious injury or death.  
Wear eye and hearing protection.  
9. Ensure debris does not blow into  
traffic, parked cars, or pedestrians.  
A. Inspect for damage.  
B. Replace or repair any  
damaged parts.  
C. Check for and tighten any  
loose parts.  
10. Check the bolts for correct torque  
every 10 hours of operation.  
DANGER  
11. Shut off engine and allow machine  
to stop completely before clearing  
debris if the machine becomes  
clogged.  
Keep hands, feet and clothing out of  
inlets and discharge openings while  
machine is operating to avoid seri-  
ous personal injury.  
4. Stand clear of the discharge area  
when operating this machine.  
5. Keep your face and body back from  
the feed opening.  
1. Do not allow hands or any part of  
body or clothing near any moving  
part.  
6. Do not climb on machine when op-  
erating. Keep proper balance and  
footing at all times.  
2. Exclude pieces of metal, rocks,  
bottles, cans, and other foreign ob-  
jects from entering the machine.  
7. Keep the machine clear of debris  
and other accumulations.  
Page 2  
6" & 8" Bear Cat Chipper Operator’s Manual  
Safety  
1.5 MAINTENANCE AND STORAGE SAFETY  
1. Replace any missing or unread-  
2. Store the machine out of reach of  
children and where potential fuel  
vapors will not reach an open flame  
or spark.  
NOTE  
able safety decals. Refer to the  
parts manual for part numbers  
when ordering safety decals from  
an area Bear Cat dealer.  
If equipped, see engine owners  
manual or contact the engine manu-  
facturer for engine safety instruc-  
tions and decals.  
3. Allow machine to cool before stor-  
ing in an enclosure.  
1.6 TOWING SAFETY  
1. Rotate the discharge tube to face  
the opposite direction of the tow-  
ing vehicle before towing. This pre-  
vents the discharge tube from pro-  
jecting over the trailer wheels and  
striking foreign objects.  
3. Do not exceed maximum towing  
speed, indicated on tire sidewall.  
Inflate tires to manufacturers specs  
as stated on the tire sidewall.  
secure it in the DOWN position be-  
fore use.  
6. Never allow passengers to ride on  
the chipper chute while the vehicle  
is moving, whether the chipper is  
running or not.  
4. Check wheel lug bolts periodically  
to ensure they are tight and se-  
cure.  
2. Connect hitch safety chains.  
Tighten and secure trailer hitch  
bolts. Do not attempt to tow the  
trailer if vehicle is not equipped with  
a 2” ball.  
7. If applicable, shut off fuel supply  
when towing.  
5. Make sure the jack stand on trailer  
is in the UP position to clear the  
ground during towing. Place the  
jack stand on a level surface and  
1.7 BATTERY SAFETY  
1. Improper use and care of the bat-  
tery on electric start models can  
result in serious personal injury or  
property damage. Always observe  
the following safety precautions:  
ANTIDOTE-Eye Contact: Flush  
with water for 15 minutes. Get  
prompt medical attention.  
Neutralize acid spills with a bak-  
ing soda and water solution. Prop-  
erly dispose of a damaged or worn-  
out battery. Check with local au-  
thorities for proper disposal meth-  
ods.  
3. The battery produces explosive  
gases. Keep sparks, flame or  
cigarettes away. Ventilate area  
when charging battery. Always  
wear safety goggles when work-  
ing near battery.  
2. Poison/Danger - Causes Severe  
Burns. The battery contains sulfu-  
ric acid. Avoid contact with skin,  
eyes or clothing. Keep out of  
reach of children.  
5. Do not short circuit battery. Se-  
vere fumes and fire can result.  
6. Before working with electrical wires  
or components: disconnect bat-  
tery ground (negative) cable first.  
Disconnect positive cable second.  
Reverse this order when reconnect-  
ing battery cables.  
4. The battery contains toxic materi-  
als. Do not damage battery case.  
If case is broken or damaged,  
avoid contact with battery contents.  
ANTIDOTE-External Contact:  
Flush immediately with lots of wa-  
ter.  
ANTIDOTE-Internal: Drink large  
quantities of water or milk. Follow  
with milk of magnesia, beaten egg  
or vegetable oil. Call a physician  
immediately.  
DANGER / POISON  
FLUSH EYES  
IMMEDIATELY  
WITH WATER  
SULFURIC  
ACID  
CAN CAUSE  
BLINDNESS OR  
SEVERE BURNS  
EYES  
EXPLOSIVE GASES  
NO  
• SPARKS  
• FLAMES  
GET  
MEDICAL  
HELP  
FAST  
CAN CAUSE  
BLINDNESS OR  
• SMOKING  
INJURY  
KEEP OUT OF THE REACH OF CHILDREN. DO NOT TIP. KEEP VENT CAPS TIGHT AND LEVEL.  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 3  
Assembly  
2
Section  
2.1 ASSEMBLING THE MACHINE  
1. Remove from shipping crate.  
flange and tighten the bolts to secure it. Install the  
second half of the clamp to the tube and flange. Rotate  
the tube 360 degrees and lock it in place with the handle  
to make sure it is mounted correctly.  
2. Support the frame on wood blocks or other support de-  
vice.  
3. Mount the two tires and rims to the axle assembly with  
the lug nuts (supplied).  
7. Install battery. (See Section 2.2)  
8. Fill the engine with oil (per instructions in supplied Honda  
engine manual) and the gas tank with gasoline.  
4. Mount the trailer hitch assembly to the frame using three  
3/8 X 3-1/2 inch bolts and locknuts (supplied).  
9. Fill the hydraulic reservoir. See Section 5.13 for specific  
instructions.  
5. Fasten the chipper chute to the main frame mounting  
bracket using eight 3/8 X 1 inch bolts and locknuts.  
Use three bolts on each side and two on the bottom.  
10. Your chipper should be ready to use.  
6. Attach the blower discharge tube to the mounting flange  
on the chipper frame. Half of the mounting clamp is  
already attached to the tube. Slide the tube into the  
Fig. #1  
Page 4  
6" & 8" Bear Cat Chipper Operator’s Manual  
Assembly  
2.2 INSTALLING THE BATTERY  
6. After filling, battery should be charged to the specifica-  
tions below and put into service immediately.  
1. The machine may or may not have been shipped with a  
battery depending on your area. If you did not receive a  
battery with your machine, you will need to purchase  
one.  
Temperature over 60° F  
3 amperes for 4 Hours.  
Temperature under 60° F  
3 amperes for 6 Hours.  
2. Use a battery that meets or exceeds the following speci-  
fications:  
Battery, Category, Lawn and Garden  
BCI Group Size U1  
200-250 CCA  
7. Place charged battery in battery box on chipper shred-  
der.  
7-3/4” X 5-3/16” X 7-5/16”  
8. Remove key from engine ignition.  
Suggested Source: Exide Cutting Edge, Type GT-H  
9. Install the positive (+) battery cable to the positive (+)  
battery terminal using a 5/16 X 1” hex head bolt and 5/  
16 nylock nut. An insulating boot is loosely installed  
on this cable. Slide the insulating boot over the termi-  
nal, making sure that the terminal is completely cov-  
ered.  
3. If you received a battery with your machine, proceed to  
the next step.  
NOTE  
The battery that was shipped with the machine was  
shipped dry. The battery will need to be serviced  
before installation.  
10. Install the negative (-) cable on the negative (-) battery  
terminal using a 5/16 X 1” hex head bolt and 5/16 nylock  
nut. There is no insulating boot for this terminal.  
4. Remove or destroy any sealing device which may have  
been used to close or restrict the vent openings.  
IMPORTANT  
º
5. Remove battery vent caps and fill cells until baffle  
plate is covered with 1.25” of electrolyte at 80° F. Bat-  
tery and electrolyte must be at a temperature above  
60° F, but should not exceed 100° F.  
DO NOTATTEMPT TO STARTTHE ENGINEATTHIS  
TIME. Wait until you have read the complete starting  
instructions in the Operation Section of this Manual.  
11. Secure battery box cover.  
WARNING  
To avoid sparks and a possible explosion or fire due  
to a short circuit:  
1. Do not touch the positive (+) battery terminal and  
any surrounding metal with tools, jewelry or other  
metal objects.  
2. When installing battery cables, connect positive  
(+) cable first and negative (-) cable last.  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 5  
Controls  
3
Section  
3.1 MACHINE CONTROLS  
6. Rotor Access Cover: Used to remove chipper blades.  
7. Engine Battery: Shipped without battery.  
For engine controls and maintenance please refer to the  
Honda engine owners manual included with the machine.  
1. Engine Fuel Tank: Use unleaded fuel—do not mix with  
oil.  
8. Clutch Foot Pedal: Used to engage rotor assembly drive  
belt.  
2. Trailer Hitch: Always use 2 inch ball and safety chains.  
9. Adjustable Chipping Anvil.  
3. Jack Stand: Always have in UP position and clear from  
ground when moving. When is use, place in DOWN  
position on a level surface.  
CAUTION  
4. Engine Drive Belts and Shield: Never remove shields  
when in use.  
The chipper rotor may continue to rotate even with the  
engine stopped. Do not attempt any repair or  
adjustments until the entire machine has come to a  
complete stop and spark plug wire is removed. Never  
operate this machine without all safety shields in place.  
5. Chipper Chute: Feed materials to be chipped through  
the chute.  
Fig. #2  
Page 6  
6" & 8" Bear Cat Chipper Operator’s Manual  
Operation  
4
Section  
3. Depress foot clutch pedal down, this will disengage drive  
belts and enable engine to start.  
4.1 STARTING THE MACHINE  
4. Refer to Honda engine owners manual for engine star-  
ing.  
CAUTION  
Move machine to a clear, level area outdoors before  
starting. Do not operate machine on a paved, concrete,  
or gravel surface. Do not operate in the vicinity of  
bystanders. Make sure cutting chamber is empty  
before starting.  
5. Once engine is running and no choke is needed, slowly  
let foot clutch pedal up. This will engage drive belt and  
the rotor will turn.  
6. If engine kills when engaging foot clutch pedal, either  
use more choke or increase engine RPM.  
7. When clutch is engaged, the foot pedal may vibrate or  
shake until the engine and rotor have increased to full  
running RPM.  
CAUTION  
Obtain and wear safety glasses at all times when  
operating the machine. Do not wear loose fitting  
clothing. The operator should always wear heavy  
boots, gloves, pants, and shirt. Use common sense  
and practice safety to protect yourself from branches,  
sharp objects, and other harmful objects.  
8. The chipper frame assembly can turn 360 degrees clock-  
wise or counterclockwise. Press down on the foot pedal  
located underneath the frame near the tow hitch and  
the frame will pivot on the trailer to your desired loca-  
tion. Let up on the foot pedal and the frame will lock  
into place for use. The discharge tube can also turn 360  
degrees to your desired location.  
1. Before starting, fill engine with oil to the correct level.  
See engine manual for operation and maintenance in-  
structions.  
NOTE  
Some oil usage is normal. Check level with each use.  
2. Before starting, fill fuel tank with fresh, clean unleaded  
regular gasoline. DO NOT MIX OIL WITH GASOLINE.  
WARNING  
Handle fuel (gasoline) with care. It is highly flammable.  
Always use an approved container and fill tank  
outdoors. Never add fuel to a running or hot engine.  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 7  
Operation  
4.2 STOPPING THE ENGINE  
3. Refer to Honda owners manual for stopping procedures.  
CAUTION  
4. Allow machine to come to a complete stop. You may  
release the foot clutch pedal to help slow the rotor once  
the engine has stopped running.  
Obtain and wear safety glasses at all times when  
operating the machine. Avoid wearing loose fitting  
clothing. Always wear heavy boots, gloves, pants, and  
shirt. Use common sense and practice safety to protect  
yourself from branches, sharp objects, and other  
harmful objects.  
NOTE  
The heavy rotor will continue to turn for some time  
after the engine has been shut off. You can tell that  
the rotor has stopped when no noise or machine  
vibration is present. Inserting a branch into the  
chipper chute to contact the blades will slow the rotor  
and shorten stopping time.  
1. Move throttle to SLOW position.  
2. Depress foot clutch pedal.  
4.3 CHIPPING  
The Bear Cat chipper is designed to chip a variety of materials  
into a more readily decomposing or handled condition. The  
following guidelines can be used to help you get started.  
2. Place limb, butt end first, into the chipper chute until it  
contacts the feed roller. The actual feed rate of the limb  
into the chipper depends on the type of material fed and  
sharpness of the cutting blades. Operate feed roller at a  
rate that will not kill the engine.  
WARNING  
3. Rotate the branch to improve cutting action.  
Keep face and body away from the feed opening. Do not  
overreach. Keep proper balance and footing at all times.  
4. The chipping blades dull with use and require periodic  
sharpening. Refer to Service and Maintenance, "Sharp-  
ening Chipper Blades" for instructions.  
1. Trim side branches that cannot be bent enough to feed  
into the chipper chute. Hold small diameter branches  
together in a bundle and feed in simultaneously.  
4.4 ROTATING THE CHIPPER BASE  
1. Disengage the Chipper LiftArm from the Chipper Base  
and then realese it by pressing it down.  
2. Rotate the Chipper Base to desired position.  
3. Once the Chipper Base has been positioned, lift up the  
Chipper Arm and lock it in place.  
WARNING  
The Chipper Base must always be locked in place.  
Failure to do so my result in machine vibration, serious  
bodily injury or death.  
Fig. #3  
Page 8  
6" & 8" Bear Cat Chipper Operator’s Manual  
Operation  
4.5 HYDRAULIC FEED OPERATION MODELS 72620 & 74824  
1. Start the chipper engine. Bring the chipper up to operat-  
ing speed. See "Operation" section for starting, opera-  
tion, and stopping instructions.  
3. If the chipper jams, reverse the feed by moving the con-  
trol arm in the reverse direction. Remove the branch  
and rotate it before reinserting it into the chute again.  
2. Engage the hydraulic feed by moving the control arm as  
shown below. The feed rate increases as the arm is  
moved.  
WARNING  
Please read and follow all safety instructions in this  
manual. Failure to operate the chipper in accordance with  
the safety instructions MAY RESULT IN PERSONAL IN-  
JURY!  
4.6 CONTROL ARM OPERATION MODELS 72620 & 74824  
Fig. #4  
4.7 HYDRAULIC FEED COMPONENT LOCATIONS MODELS 72620 & 74824  
Roller Assembly  
Hydraulic  
Motor  
Chipper  
Chute  
Reservoir  
Crossover  
Relief  
Valve  
Hydrostatic  
Pump  
Fig. #5  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 9  
Service & Maintenance  
5
Section  
5.1 SHARPENING CHIPPER BLADES  
WARNING  
When the Chipper Blades dull, chipping becomes difficult.  
It is recommended that the chipper blades are sharpened  
every 5-15 hours of chipper operation.  
The rotor assembly has a lock mechanism. When  
working on the rotor assembly, use the lock  
mechanism at all times. Remove plastic bearing cover  
under chipper chute. There is a hole in the rotor jack  
shaft and a matching hole in the bracket mounted to  
the rotor bearing front side. Install a punch through the  
rotor shaft and bracket to lock the rotor in place.  
The Chipper Blades are two edged. When the first edge  
dulls, flip the blade to use the sharp second edge. After  
both edges are dull, sharpen the chipper blades.  
Follow the procedure below to remove the chipping blades  
for sharpening:  
rotor so that the bolts holding the chipper blades are  
most accessible (See Fig. #6).  
WARNING  
3. Remove the two hex head bolts holding the blade itself.  
Repeat for all four blades. The four chipping blades have  
two edges per blade and can be reversed one time each  
before sharpening. Reinstall chipping blades and pro-  
ceed with chipping.  
Before inspecting or servicing any part of the machine,  
shut off the power source, disconnect the spark plug  
wire from the spark plug, and make sure all moving  
parts have come to a complete stop. The chipping  
blades are sharp! Use care when working on machine  
to avoid injury.  
4. If already reversed, the chipping blades will have to be  
ground to a 45 degree angle. Be careful when grinding  
so that the blade material does not get too hot and  
change color–this will remove the blade's special heat  
treated properties. Use short grinding times and cool  
with water. Try to remove an equal amount off each blade  
to maintain balance.  
1. Remove the two 3/8 inch retaining bolts holding the ac-  
cess cover to main frame assembly.  
2. Tilt access cover over to allow rotor access. Rotate the  
5. Replace the chipping blades and tighten bolts to 75 ft.  
lbs.  
Fig. #6  
Page 10  
6" & 8" Bear Cat Chipper Operator’s Manual  
Service and Maintenance  
5.3 SETTING CHIPPER BLADE 5.3 ADJUSTING DRIVE BELTS  
CLEARANCE  
Check the condition of the drive belt annually or after every  
30 hours of operation, whichever comes first. If the belt is  
The four edged chipping blades should clear the chipping  
cracked, frayed, worn, or stretched, replace it. Only  
anvil located directly under the chipper chute by 1/16 inch  
replace belt with original branded type belt, do not use  
to 1/8 inch. The chipping anvil is adjustable and  
single type belts. To adjust the belt, proceed as follows:  
reversible.  
1. Depress foot clutch pedal. Shut engine off and discon-  
1. Lift rotor access cover and expose rotor (See Fig. #7).  
nect battery cables.  
Loosen the three 1/2 inch bolts that hold the chipper  
anvil to the frame.  
2. Remove large belt guard (three 5/16 inch bolts).  
2. Measure the amount of clearance between chipping  
3. Adjust the eyebolt that anchors the idler spring to ad-  
blade and chipping anvil from inside of housing.  
just belt tension. Tighten the eyebolt until the belt de-  
flection at the center of the belt is 7/16" when a 20 lb.  
load is placed against the belt (See Fig. # 9).  
3. Adjust inward or outward to desired measurement.  
4. Tighten bolts on chipping anvil to 75 ft. lbs. and resume  
4. Replace belt guard.  
operation.  
5. Start engine and test belt for looseness.  
If chipping anvil edge is damaged or worn unevenly,  
remove the three bolts holding the anvil and use one of the  
other three edges. Adjust for correct measurement.  
Fig. #7  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 11  
Service and Maintenance  
5.4 REPLACING DRIVE BELTS  
5.5 CLEARING PLUGGED ROTOR  
1. Remove large belt guard (three 5/16" bolts).  
WARNING  
2. Loosen bolts on hydraulic pump and remove belt, if  
equipped.  
If the machine becomes plugged, depress the foot  
clutch pedal, shut off the engine, disconnect the spark  
plug wire, and allow the machine to come to a complete  
stop before clearing debris. Do not operate the machine  
without proper guards and screens in place.  
3. Lift belt idler pulley off drive belt and remove drive belt  
from pulleys.  
4. Install new belt on pulleys and lower belt idler. Check  
alignment of pulleys and adjust if needed.  
CAUTION  
5. Adjust the eyebolt that anchors the idler spring to ad-  
just belt tension. Tighten the eyebolt until the belt de-  
flection at the center of the belt is 7/16" when a 20 lb  
load is place against the belt (See Fig. #9).  
Remember to use rotor shaft lock when working on rotor.  
Feeding too large or too much chipable material at once  
may plug the chipper. To clear plugged rotor, proceed as  
follows:  
6. Replace hydraulic pump belt, if equipped. Readjust hy-  
draulic pump belt tension by sliding the hydraulic pump  
in the mounting slots. Tighten bolts.  
1. Depress foot clutch pedal and stop engine. Release  
foot clutch pedal when engine is stopped.  
7. Replace belt guard.  
2. Remove the two 3/8" retaining bolts holding the access  
cover to the main frame assembly.  
8. Depress foot clutch pedal, start engine, release foot  
clutch pedal to engage belt, and test unit. Readjust  
pulleys and belt tension if needed.  
3. Lift up rotor access cover.  
4. Clean the debris out the chipper rotor. Turn the rotor by  
hand to be sure it is free to rotate.  
7/16"Deflection  
5. Close rotor access cover and replace bolts.  
6. Depress foot clutch pedal, and start engine. Release  
foot clutch pedal when engine is running to engage drive  
belt. Resume operation.  
Fig.#8  
Page 12  
6" & 8" Bear Cat Chipper Operator’s Manual  
Service and Maintenance  
5.6 REPAIRING OR REPLACING RO-  
TOR BEARINGS  
11. Close cover and replace bolts.  
12. Replace belt guard and resume operation.  
1. Remove the two 3/8 inch retaining bolts holding access  
cover to main frame assembly. Tilt access cover over to  
allow rotor access.  
13. Depress foot clutch pedal, start engine, release foot  
clutch pedal to engage belt, and test unit. Readjust  
pulleys and belt tension if needed.  
2. Remove large belt guard (three 5/16 inch bolts).  
14. On hydraulic units remove hydraulic pump and belts  
prior to step 3 and replace prior to step 12.  
3. Lift belt idler pulley off drive belt and remove belt from  
pulleys. Using the push bolts from the bushing, remove  
the bushing and pulley from the rotor shaft.  
5.7 GREASEABLE BEARINGS AND  
PIVOTS  
WARNING  
The models have five greaseable bearings and pivots that  
require grease every 50 hours:  
The rotor assembly has a lock mechanism. When work-  
ing on the rotor assembly, use the lock mechanism at all  
times. To use, remove plastic bearing cover under the  
chipper chute. There is a hole in the rotor jack shaft and a  
matching hole in the bracket mounted to the rotor bearing  
front side. Install a punch through the rotor shaft and  
bracket to lock the rotor in place.  
1. Two bearings on the rotor shaft.  
2. One greaseable bushing on the foot clutch pedal pivot.  
3. One grease zerk on idler pivot.  
4. If a rotor bearing needs repair, it is best to remove the  
complete rotor assembly from chipper frame.  
4. One grease zerk on discharge chute.  
5. Using an overhead hoist or lifting device, remove the  
four 1/2 inch bolts on each rotor bearing and lift the rotor  
assembly completely out of the frame. The complete  
rotor assembly weighs 275 lbs.  
5.8 OTHER SERVICE TIPS  
1. Service engine according to the Honda engine manual.  
Change engine oil and filter as recommended in manual.  
6. Once the rotor assembly is out of the frame, both bear-  
ings can be removed by a puller and replaced on the  
shaft.  
2. Every 10 hours of operation, all bolts and other fasten-  
ers should be checked for correct torque.  
7. Use the overhead hoist or lifting device to return the  
complete rotor assembly to the chipper frame.  
5.9 TRAILER SERVICE TIPS  
8. Install the four 1/2 inch bolts on each bearing to secure  
them to the frame. Tighten bolts to 75 ft. lbs.  
1. Check wheel bolt torque every 10 hours of towing use.  
9. Replace drive belt on pulleys and lower belt idler. Check  
alignment of pulleys and adjust engine if needed.  
2. Check air pressure in tires every 10 hours of towing.  
Inflate to pressure marked on sidewall of tire.  
10. Check belt tension before start-up. Adjust the eyebolt  
that anchors the idler spring to adjust the belt tension.  
Tighten the eyebolt until the belt deflection at the center  
of the belt is 7/16" when a 20 lb. load is placed against  
the belt (See Fig. #8).  
3. Check and repack wheel bearings with grease every 12  
months.  
4. When towing, use a 2 inch trailer ball, and always con-  
nect the safety chains. Make sure trailer hitch bolts are  
tight and secure.  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 13  
Service and Maintenance  
5.12 HYDROSTATIC PUMP START UP  
PROCEDURE (MODELS 72620 &  
74824)  
5.10 HYDRAULIC FLUID (MODELS  
72620 & 74824)  
Handle pressurized hydraulic fluid carefully. Escaping  
pressurized hydraulic fluid can have sufficient force to  
penetrate your skin causing serious injury. This fluid may  
also be hot enough to burn. Serious infection or reactions  
can develop if proper medical treatment is not  
administered immediately.  
Follow this start-up procedure when starting a new  
installation or when restarting an installation in which the  
hydrostatic pump has been removed from the system.  
1. Before starting the hydrostatic pump, make sure all  
system components (reservoir, fittings, etc.) are clean.  
Premium hydraulic fluids containing high quality rust,  
oxidation, and foam inhibitors are required. These include  
premium turbine oils, API CD engine oils per SAE J183,  
M2C33F or G automatic transmission fluids meeting  
Allison C-3 or Caterpillar TO-2, and certain specialty  
agricultural tractor fluids.  
2. Fill the reservoir with recommended hydraulic fluid, which  
should be filtered before entering the reservoir.  
3. The inlet line leading from the reservoir to the charge  
pump must be filled before start-up. Loosen the fitting  
on this inlet line until oil bleeds out.  
WARNING  
5.11 PUMP COMPONENT LOCA-  
TIONS (MODELS 72620 & 74824)  
Do not start engine unless pump is in neutral position on  
the cable.  
4. Start the engine and run at the lowest possible RPM.  
5. As air is purged from the unit, the oil level in the reser-  
voir will drop and bubbles may appear in the fluid. Refill  
the reservoir as necessary.  
6. Run the unit and move the control arm in both direc-  
tions for several minutes until any remaining air is purged  
from the unit. Refill the reservoir as necessary.  
Fig. #9  
7. Check to ensure feed roller stops when control arm is in  
the neutral position. Adjust the cable clevis or anchor if  
the feed roller doesn't stop.  
NOTE  
A motor fitting may have to be loosened and oil bled to  
remove air from the system (use same procedures as  
steps 3-5).  
8. Shut down the engine, check for and correct any fluid  
leaks, and check the reservoir level. Add fluid if neces-  
sary. The hydrostatic pump is now ready for operation.  
NOTE  
Hydrostatic pressure controlled by the crossover relief  
valve is factory set at 1750 PSI.  
Page 14  
6" & 8" Bear Cat Chipper Operator’s Manual  
Service and Maintenance  
2. Fill the reservoir with recommended hydraulic fluid.  
(Note: The hydraulic fluid must be filtered before before  
entering the reservoir)  
5.13 HYDRAULIC FEED MAINTE-  
NANCE (72620 & 74824)  
3. The inlet line leading from the reservoir to the charge  
pump must be filled before start-up. Loosen the fitting  
at the pump on the inlet line until oil bleeds out.  
CAUTION  
Before servicing or repairing any of the hydrostatic feed  
components (pump, motor, and/or relief valve), contact  
your dealer or factory service department. Warranty on  
these items may be void without prior authorization.  
4. Start the engine and run at the lowest possible RPM.  
5. Loosen the motor fittings until oil bleeds out to remove  
air from the system. Retighten fittings.  
6. As air is expelled from the unit, the oil level in the reser-  
voir drops down and bubbles may appear in the fluid.  
Refill the reservoir as necessary.  
CAUTION  
Hydraulic systems contain fluid under high pressure.  
Never check for leaks with your hands. Relieve pres-  
sure before disconnecting any hydraulic lines.  
7. Run the feed roller in both directions for several minutes  
until any remaining air is completely expelled from the  
unit. Refill the reservoir as necessary.  
8. Shut down the engine, check and correct any fluid leaks.  
check. Check the reservoir level and add fluid if neces-  
sary. The hydrostatic pump is now ready for operation.  
The hydrostatic pump normally does not require regular  
fluid changes. The system filter should be changed at 250  
hour or annual intervals. The fluid and filter should be  
changed and system cleaned if the fluid becomes  
contaminated with foreign matter (water, dirt, grease, etc.)  
or if the fluid has been subjected to temperature levels  
greater than the maximum recommended.  
There is a greaseable bearing on each side of the main  
jack shaft on the main hydraulic feed housing. Grease  
periodically.  
5.14 ADDING HYDRAULIC FLUID  
Hydraulic fluid is used to drive the feed roller. The  
hydraulic pump is attached to the motor (diesel models)  
or connected to the motor with a belt (gasoline models).  
Premium hydraulic fluids containing high quality rust,  
oxidation, and foam inhibitors are required. These include  
premium turbine oils, API CD engine oils per SAE J183,  
M2C33F or G automatic transmission fluids meeting  
Allison C-3 or Caterpillar TO-2, and certain specialty  
agricultural tractor fluids.  
Below are the necessary startup procedures:  
1. Before starting the hydrostatic pump, make sure all sys-  
tem components (reservoir, fittings, etc.) are clean.  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 15  
Troubleshooting  
6
Section  
6.1 GENERAL TROUBLESHOOTING  
Problem  
Probable Cause  
Obstructed discharge  
Plugged rotor  
Suggested Remedies  
Use branch or similar object  
to clear discharge  
Rotor does not turn  
Clear rotor  
Use branch or similar object  
to clear discharge  
Obstructed discharge  
Hard to feed chipper or  
excessive power needed  
to chip  
Dull chipper blades  
Sharpen blades  
Adjust clearance  
Improper blade clearance  
Use branch or similar object  
to clear discharge  
Obstructed discharge  
Plugged rotor  
Clear rotor, feed material into  
shredder more evenly  
Chipper requires  
excessive power or stalls  
Green material will not  
discharge  
Alternately feed dry material,  
or allow material to dry  
Plugged rotor  
Clear rotor  
Drive belts squealing or  
smoking  
Adjust belt tension or replace  
belts if needed  
Loose or worn belts  
Check drive belts and pulleys  
for bad or worn spots  
Drivehead vibration  
Inspect rotor for broken or  
missing chipper blades and  
paddles. Repair if needed.  
Check rotor to see if it  
wobbles. Check to see if the  
rotor is assembled correctly  
Vibration while running  
Rotor out of balance  
Engine problems  
Engine dies or runs  
poorly  
Contact local Honda dealer  
Page 16  
6" & 8" Bear Cat Chipper Operator’s Manual  
Troubleshooting  
6.2 HYDROSTATIC PUMP TROUBLESHOOTING MODELS 72620 & 74824  
Symptom  
Probable Cause  
Suggested Remedy  
Engine not operating at correct  
speed.  
Repair engine governor  
Control linkage damaged or  
binding.  
Repair control linkage.  
Will not attain normal feed rate  
Bypass valve stuck partially  
open. (Problem in one direction  
only.)  
Repair bypass valve. Remove  
foreign material from valve.  
Control linkage damaged or not Repair or reconnect control  
connected  
linkage  
Repair drive (replace broken  
belt, repair sheared key, repair  
splined coupling, etc.  
Will not feed when control arm  
is moved  
Drive between engine and  
pump damaged  
Refill reservoir. Purge air from  
transmission.  
Pump low on fluid.  
Loose belt between engine and Tension drive belt (replace if  
pump.  
necessary).  
Refill reservoir. Purge air from  
transmission.  
Pump low on fluid.  
Feed rate is sluggish under  
load  
Large amount of water in  
hydraulic fluid (evaporates  
when hot resulting in low fluid  
level).  
Drain fluid from reservoir and  
unit, replace filter element, and  
refill with new fluid.  
Check relief pressure in  
system with a pressure gauge  
rated to 2500 psi. (System set  
by factory at 1750 psi.)  
Hydraulic feed will not pull in Hydraulic system overloading  
logs over 4" in diameter, or  
continuously stalls or stops  
and causing system to go over  
relief.  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 17  
Specifications  
7
Section  
7.1 SPECIFICATIONS  
Model  
Specifications  
71620  
Model  
72620  
Model  
72824  
Overall size  
76x80x90" 93x80x90" 93x80x90"  
(LxWxH)  
Max. Chipper  
Capacity  
6"  
4
6"  
4
8"  
4
Chipper Blade  
Qty.  
Reversible Reversible Reversible  
Tool Steel Tool Steel Tool Steel  
1500 RPM 1500 RPM 1500 RPM  
Rotor Speed  
Rotor Size  
30" Dia. X 30" Dia.x 30" Dia. X  
1.25"  
1.25"  
1.25"  
Rotor Weight  
Rotor Shaft  
Diameter  
275 lbs.  
275 lbs.  
275 lbs.  
1.75  
1.75  
1.75"  
Discharge Size  
Drive Type  
8"  
Belt  
8"  
Belt  
8"  
Belt  
Belt Size  
3B83  
3D83  
3B83  
Weight  
Wheel Base  
Tire Size  
1445  
66"  
1865  
66"  
1870  
66"  
5.31-12  
5.31-12  
5.31-12  
Fuel Tank Cap.  
(Gal.)  
6
6
6
Honda 20 Honda 20 Honda 24  
HP HP HP  
Engine  
Specifications are subject to change because of design  
modifications.  
Page 18  
6" & 8" Bear Cat Chipper Operator’s Manual  
Specifications  
7.2 BOLT TORQUE  
CHECKINGBOLTTORQUE:  
The tables shown below give correct torque values for various bolts and capscrews. Tighten all bolts to the torques specified  
in chart unless otherwise noted. Replace hardware with the same strength bolt.  
SAE - 2  
SAE - 5  
SAE - 8  
A
ENGLISH  
TORQUE  
Bolt Torque*  
Bolt  
Diameter  
SAE 5  
SAE 2  
SAE 8  
1/4”  
5/16”  
3/8”  
9.5  
25  
44  
7.5  
15  
27  
5.5  
11  
20  
9
18  
33  
17  
35  
63  
12.5  
26  
46  
7/16”  
1/2”  
9/16”  
5/8”  
3/4”  
7/8”  
1”  
1-1/8”  
1-1/4”  
70  
44  
67  
95  
135  
240  
240  
360  
510  
725  
32  
50  
70  
100  
175  
175  
270  
375  
530  
52  
80  
115  
160  
280  
450  
100  
150  
225  
300  
550  
875  
75  
110  
155  
215  
375  
625  
925  
1150  
1650  
115  
160  
225  
400  
650  
975  
675 1300  
850 1850 1350  
1200 2600 1950  
A
METRICTORQUESPECIFICATIONS  
Bolt  
Diameter  
Bolt Torque*  
4.8  
8.8  
10.9  
12.9  
M3  
M4  
M5  
.5  
3
5
.4  
2.2  
4
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
M6  
M8  
6
15  
29  
50  
4.5  
11  
21  
37  
60  
11  
28  
55  
95  
150  
240  
330  
475  
650  
825  
1200  
8.5  
20  
40  
17  
40  
80  
12  
30  
60  
19  
47  
95  
14.5  
35  
70  
M10  
M12  
M14  
M16  
M18  
M20  
M22  
M24  
M27  
70  
140  
225  
350  
475  
675  
925  
1150  
1700  
105  
165  
255  
350  
500  
675  
850  
1250  
165  
260  
400  
560  
800  
1075  
1350  
2000  
120  
190  
300  
410  
580  
800  
1000  
1500  
80  
110  
175  
250  
350  
475  
600  
875  
125  
175  
240  
330  
425  
625  
92  
125  
180  
250  
310  
450  
Torque figures indicated above are valid for non-greased or non-oiled threads and heads unless otherwise specified. Therefore, do not grease or  
oil bolts or capscrews unless otherwise specified in this manual. When using locking elements, increase torque values by 5%.  
*
Torque value for bolts and capscrews are identified by their head markings.  
6" & 8" Bear Cat Chipper Operator’s Manual  
Page 19  
Crary Company  
A Division of TerraMarc Industries  
237 12th St. NW • P.O. Box 849  
WestFargo, ND58078-0849  
(701)282-5520FAX:(701)282-9522  
Manufactured in the  
United States of America  
by Crary Company  

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