ICTC Holdings Corporation Paint Sprayer 300S Legend User Manual
AIRLESS SPRAY EQUIPMENT  
SAFETY, OPERATING AND  
MAINTENANCE INSTRUCTIONS  
AND PARTS LIST  
H.E.R.O. Industries  
a division of Middlefield Bancorp Limited  
2719 Lake City Way  
Burnaby, B.C., V5A 2Z6  
Phone: (604) 420-6543 Toll Free800-494-4376  
Fax: ( 604 ) 420-8725C  
E-Mail:sale[email protected] Website://www.hero.ca
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Table of Contents  
Important Safety Precautions  
Introduction  
4 – 5  
6
Operating Instructions  
Setting up to Spray  
6
7
Flushing The Unit  
8
Special Notes  
9
Airless Spray Painting Suggestions  
Trouble Shooting  
10 – 13  
14 – 22  
23  
Intake Seat Replacement  
Outgo Valve  
24  
Bleed Valve Repairs  
Diaphragm Replacement  
Hydraulic Head Insert Replacement  
Piston Repairs  
25  
26  
27  
28 – 29  
30  
Pressure Control Valve Repairs  
Accessories  
31  
Parts List & Description  
Exploded Unit Schematics  
32 – 36  
37 – 38  
IMPORTANT  
AS WITH ALL MECHANICAL EQUIPMENT, PROPER OPERATING AND MAINTENANCE  
PROCEDURES ARE REQUIRED TO KEEP YOUR H.E.R.O. AIRLESS PUMP PERFORMING  
TO YOUR SATISFACTION. THE FOLLOWING SAFETY, OPERATING AND MAINTENANCE  
INSTRUCTIONS ARE IMPORTANT.  
Read and understand this manual completely, especially with regard to all safety precautions. Read and  
follow instructions on all warning labels on your equipment. Keep the warning labels clean and readable at  
all times. Order new labels from your local distributor or from H.E.R.O. Industries if needed.  
The manufacturer shall not be responsible for any loss, damages, or injury of any kind or nature whatsoever  
resulting from the use the equipment other than in strict compliance with the instructions, cautions and  
warnings contained in this operating and instruction manual and as displayed on the face of the equipment.  
This system is capable of producing 2400 psi. ( spray pressure ). To avoid rupture and injury DO NOT  
operate this pump with components rated less than 3000 psi. working pressure (including but not limited to  
spray guns, hose and connections).  
Before servicing, cleaning or removing of any part, shut off power and relieve pressure.  
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IMPORTANT SAFETY PRECAUTIONS  
WARNING  
Material issuing from the spray tip is at high pressure. If fingers, or any part of the body are placed near  
the tip of the spray gun, it is possible that the spray could break the skin and inject some of the spray  
material. If injury does occur, seek immediate attention of a medical doctor. Be prepared to inform the  
doctor what fluid was injected, if the injury is of an injection nature. Equipment and chemicals when  
used improperly can be dangerous!  
ýNEVER place any part of the body in front of the spray tip or aim the gun toward any part of the  
body.  
ýNEVER point the gun toward any individual.  
ýNEVER treat any injury as a simple cut. If injury does occur, seek immediate medical attention. Be  
prepared to inform the doctor what fluid was injected.  
ýNEVER allow another person to use the sprayer unless he is thoroughly instructed on its operation  
and has read all safety precautions in this manual and all safety warning labels attached to unit.  
ýNEVER use around children.  
ýNEVER attempt to perform any maintenance or service on any part of the unit spray system without  
first;  
1. Shutting off the unit.  
2. Disconnecting the power cord from the outlet.  
3. Relieving all pressure in the pump by triggering the gun.  
4. Locking gun trigger in "LOCKED" position, with gun locked closed.  
ýNEVER operate the sprayer without the tip guard complete and in place.  
ýNEVER spray any material in the vicinity of open flame, pilot lights, electrical outlets or any other  
source of ignition.  
ýNEVER spray volatile materials with flash points lower than 140 F (60 C).  
ýNEVER attempt to stop any leakage in the paint line or at any fitting with your hand or any part of  
your body. Immediately shut off the unit should leakage occur.  
ýNEVER wash an electric motor, nor operate it in the rain or in wet or damp areas, to protect yourself  
from electric shock.  
ýNEVER allow paint hose to become kinked, or to vibrate against rough or sharp surfaces.  
ýNEVER operate the unit at pressures higher than the pressure rating of the lowest rated component  
in the system, or at pressure higher than factory preset.  
ýNEVER spray in an enclosed area. The spraying area must be well ventilated to safely remove  
chemical vapors.  
ýNEVER operate the unit with worn or damaged accessories, or with accessories other than those  
supplied by H.E.R.O. Industries, unless the accessories have been first specifically approved in  
writing by H.E.R.O. Industries.  
ýNEVER allow the unit to be serviced or repaired anywhere other than an authorized H.E.R.O.  
Service Center, or with other than genuine H.E.R.O. parts or components.  
ýNEVER leave unit unattended without first shutting off, triggering the gun to relieve all pump  
pressure, and setting the trigger lock on gun in "LOCKED" position, with gun locked closed.  
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ALWAYS  
þALWAYS follow H.E.R.O. recommendations for operation and safety completely.  
þALWAYS ensure that switch is in off position before plugging in the electric motor.  
þALWAYS set trigger lock on gun in "LOCKED" position when not in use, with gun locked close.  
þALWAYS check connections and fittings for tightness before operating the unit.  
þALWAYS locate the unit in a well ventilated area a minimum of 25 feet from the spray area.  
þALWAYS ground the unit, the paint containers, and the object being sprayed to eliminate static  
discharge. Ensure that all these objects remain grounded throughout the entire spraying operation.  
þALWAYS use approved 3 prong grounded extension cord and approved grounded outlets of the  
voltage and frequency specified on the motor. The outlet must be at least 25 feet from the spraying  
area.  
þALWAYS use approved 3 prong grounded extension cord not less than # 12/3 gauge up to 50 feet,  
and not less than # 10/3 gauge up to 100 feet. DO NOT exceed 100 feet of extension cord.  
þALWAYS use accessories and components approved for at least 3000 psi (working pressure) in the  
spraying system.  
þALWAYS use accessories and components supplied by H.E.R.O. Industries, or specifically  
approved in writing by H.E.R.O. Industries on with the unit  
þALWAYS examine accessories for wear or damage before operating the unit  
þALWAYS use lowest possible pressure when flushing and cleaning the unit, and hold the gun firmly  
against a metal container to reduce static discharge possibility.  
þALWAYS wear a face filter mask when operating the unit.  
þALWAYS ;  
1. Turn off the motor  
2. Disconnect the power cord from the outlet.  
3. Relieve all pressure in the pump by triggering the gun.  
4. Lock gun trigger in "LOCKED" position, with gun locked closed before attempting to perform any  
maintenance or service on any part of the unit spray system.  
þALWAYS wear safety glasses when operating the unit.  
þALWAYS ensure fire extinguishing equipment is readily available and properly maintained in the spray  
area.  
þALWAYS observe good housekeeping and keep the spray area free from obstructions.  
þALWAYS be aware that certain chemicals may react with aluminum, carbide, or other components in  
the pump system. Read the manufacturer's label on all materials to be sprayed, and follow the  
manufacturer's recommendations. If in doubt, consult your material supplier to be sure.  
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H.E.R.O. AIRLESS SPRAY PAINTING  
Welcome to the world of H.E.R.O. airless paint spraying. We are sure you will enjoy owning and operating  
your new H.E.R.O. model 300S or 300SL. With H.E.R.O. airless spray equipment you will avoid the  
inconvenience and mess of over spray. You are spraying paint, not air, and the paint is driven to the painting  
surface in a clean, fan shaped spray which penetrates all cracks and corners. To attain these results, you must  
adjust the pressure as low as possible. We recommend that you become familiar with your H.E.R.O. unit.  
Discuss with your dealer the useful accessory items he has to offer - various types of tips, extension poles for  
hard to reach areas, extra hose, etc. Use of accessory items is often the difference between a good job and an  
excellent one!  
OPERATING INSTRUCTIONS  
WARNING  
Do not attempt to operate this machine until you have read and understood all safety precautions and  
operating instructions. Equipment and chemicals when used improperly can be dangerous.  
Your H.E.R.O. airless sprayer has been fully factory tested prior to shipment.  
BEFORE STARTING YOUR H.E.R.O. PUMP....  
CHECK to ensure that the shipping seal has been removed from under the cap on the hydraulic tank.  
Hydraulic tank should be at least 3/4 full of H.E.R.O. LVO hydraulic fluid.  
CHECK all fittings and connections in the pump system, hose, and gun to ensure that they are tight.  
CHECK to ensure that there is a spray tip in the gun, and that the tip is the correct size for the coating you  
are to spray. ( There are various tips available, for each type of coating or configuration. See " Airless Spray  
Tip " on page 12/13 , for proper tip selection.  
CHECK to ensure that you have H.E.R.O. strainer bags, H.E.R.O. Wonder Wash, appropriate thinner for  
the paint, a waste container, and any other accessories you may require for the job.  
CHECK to ensure that you have adequate extension cord size and length if the machine cannot be situated  
immediately next to an electric outlet. Distances up to 50 feet require #12/3 wire grounded cord, up to 100  
feet require #10/3 wire grounded cord. DO NOT exceed 100 feet of extension cord. If distance is greater,  
obtain and install extra length of H.E.R.O. airless spray hose.  
READ THIS MANUAL THOROUGHLY.  
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SETTING UP TO SPRAY  
1 Remove unit from shipping carton. Inspect exterior of unit for any signs of  
freight damage. If any parts are found to be broken or damaged, immediately  
contact the carrier and arrange for an inspection of the concealed damage.  
Claims for freight damage must be made by the CONSIGNEE and not by the  
shipper. The carrier accepts full responsibility for the safe delivery of  
merchandise upon pick-up from the shipper.  
2 Attach intake hose assembly (ref# 1) onto hose barb (ref# 7). Tighten clamp (ref#  
6 ) securely.  
3 Attach prime hose (ref# 48) to prime valve (ref# 44). Secure with clamp (ref# 49).  
4 Attach paint hose to outgo tee (ref# 33).  
5 Attach gun to paint hose. NOTE; Spray tip and tip guard should be attached to  
gun prior to attaching to hose.  
6 Place intake siphon assembly into a clean 5 gallon pail.  
7 Install strainer bag (accessory item 5GAL SB) in pail and secure with large rubber  
band ( accessory item 106). NOTE; Strainer bag must remain 4 inches from the  
bottom of pail  
8 Trigger gun to release any pressure in the unit. Use extreme caution to ensure that  
the gun is not directed towards anyone or any object which may be damaged.  
NOTE; Unit may contain storage solution.  
9 To remove storage solution, add one gallon of thinner, compatible with the type of  
paint to be used, to the siphon pail.  
10 Turn pressure control handle (ref# 43) counter clockwise to lowest pressure setting.  
11 Be sure motor switch is in "OFF" position. Plug unit into 115V, 15 amp., grounded  
circuit. NOTE; If using an extension cord, you MUST use a #12/3 wire  
grounded cord, up to 50 feet or #10/3 wire grounded cord, up to 100 feet. DO  
NOT EXCEED 100 FEET OF EXTENSION CORD. If distance is greater,  
purchase and install additional lengths of airless spray hose.  
12 Turn motor switch "on".  
13 Turn prime valve handle (ref# 43) counter clockwise until fully open. Allow  
thinner to circulate back into the siphon pail for a few minutes. Then turn the prime  
valve knob clockwise to close the valve ( close tightly ), and direct the flow to the  
paint hose and gun. Leave the pressure setting low.  
14 Trigger gun into waste container.  
15 Pour paint through strainer bag into siphon pail.  
16 Repeat steps 13 and 14, until paint flows freely. NOTE; Never turn prime  
valve back to "prime" position when the unit is under pressure.  
17 Spray a test pattern. Begin by spraying a test pattern onto old newspaper or  
other scrap material.  
18 Increase the pressure, slowly at first, by turning the pressure control knob  
clockwise. Continue increasing the pressure until the spray pattern is uniformed  
from top to bottom, with no heavy areas. Secure pressure control setting, by  
turning the silver lock ring (ref# 76) counter clockwise until snugly against the  
face of the pressure control knob. If heavy areas are still visible at maximum  
pressure setting, thin the paint with the correct thinner, according to the paint  
manufacturer's recommendations.  
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FLUSHING THE UNIT AT SHUTDOWN  
OR COLOR CHANGE  
If shutting down for a short period of time, it is sufficient to trigger the gun  
to relieve pressure. Then set the safety lock on gun to "locked" position with  
the gun locked closed and immerse the gun in a container of the correct  
thinner for the paint you are spraying.  
1. Remove spray tip from gun.  
2. Turn pressure control knob counter clockwise to low pressure setting.  
Only use sufficient pressure to allow material to move through the  
sprayer. DO NOT operate at or near full pressure.  
3. Remove siphon assembly from paint container.  
4. Trigger gun, back into paint container, until unit runs dry.  
NOTE: Pump and spray hose will continue to contain paint. This paint  
may be recovered by placing prime hose into paint container and draining  
the remainder while re-priming with cleaning fluid. See step 5* and 6*.  
5. Place siphon assembly in container of correct thinner, for the spray  
product being used,, and prime the pump as shown in step 13, of  
"Spraying". *See special notes from step 4. Allow thinner to circulate  
back into the container for a few minutes to flush the prime valve.  
6. Close prime valve.  
7. Trigger gun into paint container until thinner comes through. *See special  
notes from step 4. Re-direct flow into waste container and continue  
spraying until thinner runs clear. Heavily soiled thinners may have to be  
changed to complete cleaning job.  
8. Lift siphon assembly and allow pump to run dry.  
9. Repeat procedure using a gallon of H.E.R.O. Equipment Wonder Wash  
solution. If not using Wonder Wash, unit must not be stored with water.  
Only store with a non corrosive material ( Paint thinner, solvent ).  
10. Switch unit "off" and trigger gun to relieve remaining pressure.  
11. Remove and rinse gun handle filter in correct thinner.  
SPECIAL STORAGE INSTRUCTIONS  
In areas where the sprayer is NOT used 12 months of the year, special  
preparations must be used for winter or off season storage. Because solvents  
evaporate quickly, they should not be used for long term storage. A petroleum  
based solution ( solvent and oil ) should be used as an extended storage  
material. DO NOT allow storage solution to freeze in the sprayer.  
H.E.R.O. Equipment Wonder Wash, available from your H.E.R.O.  
distributor, will provide the added cleaning benefits of solvent at a much  
lower cost. Suitable as a short term ( 1-2 days ) storage solution only  
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SPECIAL NOTES AND INSTRUCTIONS  
NEVER LEAVE THE UNIT UNDER PRESSURE WHEN NOT SPRAYING (MOTOR TURNED  
OFF). RELIEVE PRESSURE BY TRIGGERING GUN. NEVER STORE THE UNIT WITH PAINT  
OR WATER IN THE PUMP SYSTEM, EVEN OVERNIGHT.  
ý NEVER attempt to start the motor when the unit is under pressure. Relieve pressure and follow  
instructions in "Setting up to spray"  
ý NEVER attempt to run the motor on longer or lighter extension cord than specified.  
ý Avoid operating the unit while tilted. Keeping it level assures greater operating efficiency.  
þ If motor's thermal overload switch has opened, unplug unit and allow it to cool.  
ý DO NOT attempt to resume spraying before determining and correcting the cause of overheating.  
þ Always follow flushing and cleaning instructions exactly.  
þ In hot weather, locate unit in shade.  
þ Regularly check the level of H.E.R.O. LVO hydraulic fluid in the hydraulic tank. It should be kept near  
full, top up as needed with only genuine H.E.R.O. LVO hydraulic fluid.  
þ Crankshaft eccentric bearing should be greased at regular intervals consistent with hours of use. Use  
MO-2 grease ( i.e. common auto grease) approximately every 10 hours of operation.  
þ If you wish to power your H.E.R.O. airless sprayer with a generator, it must be a minimum of a 4500  
watt generator, in good operating condition.  
NOTE; An electric tool must be powered by a generator which has an output wattage of at least three  
times the maximum draw of the motor under full load.  
þ A minimum 50’ and a maximum of 300’ of airless spray hose may be used.  
NOTE: 50’ x 3/8” paint hose ( part # 117 ) should be used for every 50’ x 1/4” paint hose  
( part # 114 ) over 100’.  
100’ total length of paint hose = 2 of 50’ x 1/4” paint hose.  
150’ total length of paint hose = 2 of 50’ x 1/4” paint hose and 1 of 50’ x 3/8 paint hose.  
200’ total length of paint hose = 2 of 50’ x 1/4” paint hose and 2 of 50’ x 3/8 paint hose.  
250’ total length of paint hose = 3 of 50’ x 1/4” paint hose and 2 of 50’ x 3/8 paint hose.  
300’ total length of paint hose = 3 of 50’ x 1/4” paint hose and 3 of 50’ x 3/8 paint hose.  
þ Product viscosity, altitude ( feet above sea level ) and vertical reach can effect pump performance and  
special accessories may be required. Product viscosity may have to be further reduced at higher  
elevations. Special “ High Altitude” siphon assemblies ( part # 4-210-HA ) are available for use in  
areas at or above 5000 feet above sea level. This kit may also prove beneficial if spraying thicker  
viscosity materials. The larger diameter 3/8” paint hose should also be used.  
þ Check drive belt ( part # 66/100 ) tension frequently. The belt will stretch with use, and should be  
adjusted after 20 hours of operation and again after 50 hours. Periodic checks after 50 hours should be  
made. Failure of the drive belt is not covered by the equipment warranty, so proper maintenance of the  
belt is important.  
þ Regularly check fittings, bolts, nuts and connections for damage. Tighten, adjust or replace as required.  
þ Check crankshaft alignment often. An out of alignment crankshaft will cause the damage to the  
eccentric bearing.  
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AIRLESS SPRAY PAINTING  
SUGGESTIONS AND TECHNIQUE  
A good airless spray application is the result of many factors. Surface preparation, which includes cleaning  
and degreasing, priming, material compatibility, quality finish product and correct application technique, are  
all important to the finished results.  
The key to all good applications is a good spray gun technique. The finished results are what the client will  
look at and base his opinion on. Your skill and abilities are as important as good equipment and good paint.  
Proper application techniques can easily be learned by using the following simple guidelines. If you are not  
familiar with the basic spray techniques we recommend that you study this portion of the manual and  
practice the techniques shown. Practice your technique on scrap cardboard or old newspaper until you feel  
confident.  
FOR EXCELLENT RESULTS, READ AND PRACTICE THESE TECHNIQUES  
1. Always strain all paint through a H.E.R.O. strainer bag.  
The most common reason for airless sprayers to malfunction is foreign matter jamming the valves or  
plugging the tip. Always strain the paint before putting through the pump.  
2. Always spray at the lowest pressure setting which will provide a uniform spray fan. (fig. 1, page 11)  
Adjust pressure control knob so that paint is completely atomized . Insufficient pressure will result in  
"tailing". Too much pressure will result in excess fog and over spray, excess tip wear, and increased  
sprayer wear and tear. See setting up to spray, page 5.  
3. Always spray at right angles to the surface being sprayed. (fig. 2, page 11)  
Angling or arcing the nozzle toward the surface will cause uneven coverage and excessive over spray.  
4. Always hold spray gun 12-15 inches from spray surface. (fig. 3, page 11)  
Too close and the fan width will be reduced and material will be applied too heavily (runs).  
Too far from the surface and you will have excessive over spray and light coverage (transparent).  
5. Always move the gun parallel to the surface being sprayed, at a consistent speed.  
This avoids uneven coverage (thick or thin areas).  
6. Always start the spray stroke before triggering the gun and release the trigger before completing the  
stroke. (fig. 4, page 11)  
This avoids heavy build up of paint at either end of the spray stroke.  
7. Always lap your spray pattern by one half. (fig. 5, page 11)  
This assures full coverage of the surface being painted.  
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AIRLESS SPRAY PAINTING  
SUGGESTIONS AND TECHNIQUE  
FIG. 1  
Poor  
Good  
Tailing  
Good Pattern  
Fog, Over Spray  
FIG. 2  
FIG. 2  
FIG. 3  
FIG. 4  
FIG. 5  
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AIRLESS SPRAY PAINTING SUGGESTIONS AND TECHNIQUE  
SPRAY TIP SELECTION  
TIP SIZE  
FOR APPLICATION OF  
.021  
.018  
.015  
.013  
.011  
.009  
Exterior Latex on large unobstructed areas. (max. size allowed) ( 60 OZ. )  
Interior Latex, Exterior Latex, Shake Paint, Exterior Flat Paints. ( 46 OZ. )  
Alkyd Flat Enamel, Interior Latex, Semi-Gloss Enamel, Stains. ( 30 OZ. )  
Fine ground Gloss Enamels, and good quality Stains. ( 23 OZ. )  
Clear Varnishes and Lacquers. ( 15 OZ. )  
Clear Varnishes and Lacquers. ( 10 OZ. )  
NOTE: The above volumes achieved with gun wide open for 1 minute and pump spraying at 2000 psi.  
All volumes are approximate. To test worn tips, spray water through the tip at 2000 psi. for 1 minute.  
Spray into bucket and weigh amount (less weight of bucket). If it is substantially greater than what is  
listed above, then the tip should be discarded or reclassified. As a tip wears, the hole gets larger and the  
fan pattern becomes narrower.  
ORIFICE SIZE  
All tips are rated by the size of the orifice or bore size. The bore size is measured in thousandths of an inch  
( .018 = 18 thousandths of an inch ). The size of tip required is based on the consistency of the material to be  
sprayed. The thicker the paint, the larger the tip size required. Always consult the product label or ask the  
paint retailer for the manufacturer's recommendations with regard to proper tip sizes.  
FAN WIDTH  
Fan width or pattern width is determined by the spray tip's "fan width" classification. This size is measured in  
inches, and is determined when spraying 12 inches from the spray surface. Various methods of noting the fan  
widths are used by tip manufacturers. Ask your distributor for assistance.  
NOTE: Two tips having the same tip size, but different fan widths will deliver the same amount of paint  
over a different area (wider or narrower strip). A spray tip with a narrow pattern width makes it easy to  
spray in tight places. Use only good quality, high-pressure tungsten carbide spray tips.  
SPRAY TIP REPLACEMENT  
During use, especially with Latex paint, high pressure and material abrasion will cause the orifice to grow  
larger. As the orifice grows larger, the fan width grows smaller. Replace tips before they become excessively  
worn. Worn tips waste paint, cause over spray, make cutting in difficult, and decrease sprayer performance.  
NOTE: When using Latex paint, a spray tip will wear at the rate of one size for approximately every 100  
gallons of material sprayed.  
An excessively worn tip can be the cause of apparent operating problems with the unit. If a tip is worn  
past the aperture size which the unit can support, pulsation will become evident in the spray fan/pattern.  
Added strain is placed on the Hydrapulse membrane as it attempts to keep the spray pressure consistent.  
When the tip wears beyond .021, its is releasing more material than the unit is bringing in. The natural  
reserve of product in the paint chamber is reduced and harm to the membrane begins. ALWAYS check  
your tips for wear when trouble shooting the equipment. The 300S/SL can support up to a maximum of  
a .021 tip.  
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SPRAY TIP SELECTION  
AIRLESS TIP’S FLOW RATE ( GALLONS PER MINUTE )  
Orifice Size  
In Inches  
GPM  
Flow Rate  
Orifice Size  
In Inches  
GPM  
Flow Rate  
.007  
.009  
.011  
.013  
.015  
.017  
.05  
.08  
.12  
.18  
.23  
.30  
.018  
.019  
.021  
.023  
.026  
.031  
.35  
.40  
.47  
.57  
.72  
1.1  
AIRLESS TIP RECOMMENDATIONS  
COATINGS  
COATING  
VISCOSITY  
FILTER  
MESH  
ORIFICE  
SIZE *  
Varnishes  
Light Body  
100 – 150  
.009, .011  
.009, .011  
.009, .011  
.009, .011  
.011, .013  
.011, .013  
Lacquer Finishes (clear)  
Sanding Sealers  
Shellac (clear)  
Transparent Stain  
Water Sealers (clear)  
Solid Stains  
Medium Body  
60 – 100  
.013, .015  
.013, .017  
.015, .017  
.017, .019  
Exterior House Paint  
Interior Wall Paint  
Interior & Exterior Primers  
Commercial Grade Architectural Coatings:  
Interior Wall Paints  
Heavy Body  
Extra Heavy  
30 – 60  
.017, .019  
.017, .019  
.019, .023  
.019, .023  
Interior Wall Primers  
Dry Fall (Quick Dry)  
One Coat, Primer-Finish Paints  
Elastomerics  
.021 – .031  
.021 – .027  
.025 – .031  
Pigmented Water Proofer’s  
Block Filler  
* Fan width between 8 and 12 inches.  
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TROUBLESHOOTING  
Hydraulic Energy Regulated Output (H.E.R.O.) is more than just our name, it is the bases for the  
operation of the pump. It is the regulation or control, of hydraulic energy, which allows the equipment to  
build and then deliver or have an output of pressure. Once you have a basic understanding of the operation of  
the equipment and the effect created in one area and how it will effect operation in another area, you will be  
better able to diagnose and make repairs.  
All H.E.R.O. diaphragm pumps are made up of two (2) distinct pumps. The first, and most important  
pump is the hydraulic pump. The hydraulic system is made up of two valves, the hydraulic intake valve (ref#  
62) and the hydraulic outgo valve, known as the hydraulic pressure control valve (ref# 73). The second pump  
is known as the paint or material pump. The paint system is made up of two basic valves, the paint intake  
valve assembly (ref# 11-15), paint outgo valve, (ref# 22). A third valve, known as a prime valve (ref# 34) is  
used during the priming procedure, (see "setting up to spray"). For correct operation, all five valves must be  
in good working condition. For this manual we will refer to the two systems as "hydraulic" and "paint".  
At the center of these two pumps is the diaphragm. The diaphragm is a flexible nylon disc which transfers  
the energy (pressure) created by the hydraulic pump, to create energy (pressure) in the paint pump. The  
function of the diaphragm is to create a barrier between the hydraulic oil and the spray material and transfer  
the energy created.  
To fully understand and trouble shoot a H.E.R.O. pump, always keep in mind that "for every action,  
there is an opposite or corresponding re-action". For every action of the hydraulic intake valve (ref# 62),  
there is an opposite re-action of the hydraulic outgo valve (ref# 73). At the same time there are  
corresponding re-actions taking place within the paint pump. This means that as the hydraulic intake valve is  
opening, so is the corresponding paint intake valve, and while the hydraulic outgo valve is closing, so is the  
corresponding paint outgo valve. The operation and function of each valve is discussed at the end of this  
section.  
For correct operation to begin, the hydraulic system must be fully primed and all air must be removed  
( see "purging" page 19 ). Operation begins with piston in the backward position (fig.# 2). At this point the  
hydraulic intake is open, while the hydraulic outgo valve is closed. The corresponding paint valves are in  
similar positions.  
As the piston moves forward, it pushes hydraulic oil forward. This movement of oil causes the hydraulic  
intake valve to close and the diaphragm to move forward (fig.# 1). The hydraulic outgo valve will remain  
closed until sufficient pressure is created to cause it to open. While the hydraulic valves are operating a  
corresponding re-action is taking place in the paint valves. The forward movement of the diaphragm pushes  
the paint, causing the paint intake valve, (ref# 11-15) to close. The trapped paint requires a means of release,  
so it forces the outgo valve, (ref# 22), to open and paint flows to the gun.  
Fig. 2  
Fig. 1  
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TROUBLESHOOTING  
The backward movement of the piston, creates a vacuum in the hydraulic system. This causes the  
hydraulic outgo valve to close and the hydraulic intake valve to open (fig# 1). Opening of the hydraulic  
intake valve allows a new supply of hydraulic oil to enter the system, replacing the oil which was used on the  
forward stroke. Once again a corresponding re-action is taking place in the paint pump. The diaphragm is  
pushed backward by the paint intake spring, (ref# 15). The backward diaphragm movement causes a vacuum  
in the paint pump. This vacuum causes the intake valve to open, allowing a new supply of paint to enter. The  
corresponding paint outgo valve is drawn closed by the vacuum created by the diaphragm.  
These operations are repeated at a rate of 750 times a minute. These continuously repeated actions draw  
paint into the pump, pressurize it, and then deliver it to the gun. The failure, of any one valve, to operate  
correctly will effect the overall equipment performance.  
Each of the five valves mentioned earlier, have an important function and will effect the overall  
performance of the unit if not performing correctly.  
HYDRAULIC INTAKE VALVE (REF# 62, PART # 4-30)  
The hydraulic intake valve, is a small vacuum valve which controls the hydraulic oil entering the  
hydraulic pump/cylinder area. Once the oil has past through the valve it is prevented from returning. The  
valve is commonly called a “one way check valve”. Valve failure will result in the hydraulic pump being  
unable to build pressure, and the diaphragm will stop moving. Spray pressure will cease.  
HYDRAULIC OUTGO VALVE (REF# 73, PART # 4-27C)  
The hydraulic outgo valve, better known as the "pressure control valve", is used to control the units  
operating pressure. The valve is fully adjustable from 0 psi. to 3000 psi. By turning the pressure control valve  
knob (ref# 74) clockwise the pressure is increased. The hydraulic pump continues to build at all times and  
must have a means of releasing this pressure. Pressure applied to the P.C. ball, (ref# 87) will keep it lodged  
in the P.C. seat (ref# 86) until the internal hydraulic oil pressure is sufficient to cause it to open. The point at  
which the oil is released is equal to the level set by the control knob. As components within the pressure  
control valve wear, the valve looses its ability to maintain or reach the required pressures (see "low static  
pressure").  
PAINT INTAKE VALVE ASSEMBLY (REF# 11-15)  
The paint intake valve is made up of five items, endcap (ref# 11) complete with seat (ref# 12), intake  
ball (ref# 13), cage complete with spring (ref# 14), and large spring (ref# 15). The intake valve controls the  
incoming flow of spray materials and is responsible for keeping them from returning to the source. The ball  
must be able to create a complete seal on the seat, otherwise pressure will be lost. A worn intake valve will  
permit correct static pressure, but supply lower spray pressure. A worn intake ball will become smaller in  
diameter and loose its ability to seal at the seat. A worn seat will develop a large step in the area where  
contact with the ball is made. This can cause the intake ball to distort in shape making the ball egg shaped. If  
the valve assembly becomes warm to the touch, this may be a sign of a loose or worn seat or erosion / wash  
out of the endcap block. The seat is Loc-Titeed into the endcap and must remain tightly sealed at all times.  
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TROUBLESHOOTING  
PAINT OUTGO VALVE (REF# 22, PART # 4-11A)  
The paint outgo valve monitors and controls the flow of spray materials as it leaves the sprayer. It also  
works together with the paint intake valve, to build paint pressure as specified by the setting made by the  
hydraulic outgo valve (pressure control valve). A worn outgo valve will result in pulsation in the spray  
material and cause the paint hose to jump and vibrate vigorously.  
PRIME VALVE (REF# 34, PART # 4-606 – NEW)  
The prime valve is used at the beginning and end of the spray operation (see "setting up to spray"). The  
function of the prime valve is to assist in removing air from the paint pump when beginning to spray. It is  
necessary to remove all air from the paint pump so that the spray material can replace it. The pump will  
function without the prime valve, however, the initial priming procedure would require considerably longer  
to complete. During the priming procedure the diaphragm is exposed to its greatest amount of stress. Use of  
the prime valve and a lightweight thinner, which is compatible with the intended spray material, will reduce  
diaphragm stress and reduce priming time. The prime valve will also allow you to remove any unused paint  
left in the pump and hose at the completion of a job. When the prime valve is open the material is pumped  
through the paint intake and outgo and back to the source by way of the prime valve return hose. When  
closed, no material should be escaping from the prime valve return hose (ref# 48). If material escapes  
through the prime valve return hose, when the valve is closed, spray pressure at the gun will be reduced.  
The solution to almost all problems can usually be found in the paint side valves. However, before  
performing any repair or looking further, the following are things which can cause an apparent sprayer  
failure, without any mechanical problem. ALWAYS check these items before preceding.  
1. Circuit breaker open or fuse blown.  
2. Motor not plugged in.  
9. Gun handle filter plugged.  
10. Paint hose plugged.  
3. Motor not switched on.  
11. Loose fitting or hole in siphon hose.  
12. Intake siphon hose plugged.  
13. Siphon screen missing or plugged.  
14. Sprayer under pressure when restarting.  
15. Strainer bag plugging siphon screen.  
4. Motor thermal reset popped.  
5. Too light or too long of an extension cord.  
6. Pressure control knob loose or missing.  
7. Spray tip plugged.  
8. Spray tip worn out.  
UNLESS YOU ARE KNOWLEDGEABLE ABOUT THE REPAIR OF HIGH PRESSURE  
EQUIPMENT, DO NOT ATTEMPT TO REPAIR AN AIRLESS SPRAYER YOURSELF. ALWAYS  
FOLLOW ALL SAFETY PRECAUTIONS. THE H.E.R.O. SERVICE VIDEO TAPE (1-620-VHS OR 1-  
620-BETA) WILL PROVIDE COMPLETE SERVICE TRAINING. SEE YOUR H.E.R.O.  
DISTRIBUTOR TO PURCHASE A COPY.  
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TROUBLESHOOTING  
PRESSURE TEST  
To verify the performance of an airless sprayer, use of pressure gauge is required. A pressure gauge (min.  
3000 psi) installed at the gun, using a new .021 tip, and not less than 50 feet of H.E.R.O. airless spray hose is  
needed. If you do not have access to these items, your local H.E.R.O. authorized service center will be able  
to perform this test. Your model 300S/SL is manufactured to perform at;  
2650 psi -- Static pressure, with lock ring (ref# 76) on pressure control valve (ref# 73).  
1950 psi -- Pressure drop, when gun trigger is squeezed.  
2250 psi -- Spraying pressure, after recovery time.  
If your unit is unable to perform to the above pressure levels consult the troubleshooting guide for the  
required repair procedure.  
DIAPHRAGM TEST  
If your unit is disabled and you are unable to perform a pressure test, use the following procedures for  
determining the area to repair. This test will divide the two halves of the equipment (hydraulic from paint)  
and make identification of your solution easier to obtain. This test is commonly referred to as the  
"Diaphragm Test"  
The solution to almost all problems can be found in the paint side valves, due to the increased wear from  
contact with the abrasive paint/spray materials. Intake valve assembly (ref# 11-15), Outgo valve (ref# 22),  
and Prime valve (ref# 34) make up the three paint valves. Refer to pages where exploded views of these  
valves are shown. To eliminate the hydraulic side of the pump  
(piston side of diaphragm) as a source of problems;  
1 Remove the intake valve end cap (ref# 11) by removing the  
four cap screws (ref# 9 ).  
2 Remove large spring (ref# 15).  
3 Start unit.  
4 Increase the pressure by turning the pressure control knob  
(ref# 74) clockwise to full pressure.  
5 Put pressure on the center of the exposed diaphragm with the  
handle of a screwdriver or other blunt object. NOTE: The  
diaphragm is located between the paint head (ref# 18) and  
the hydraulic head (ref# 53)  
6 If you are UNABLE to stop or alter the hydrapulse  
membrane's movement, then the hydraulic side is operating  
properly. The problem is located in the “Paint” pump. See  
troubleshooting guide for additional information.  
56  
19  
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TROUBLESHOOTING  
SITUATION  
POSSIBLE CAUSE (REMEDY)  
ELECTRIC MOTOR WON'T START/RUN  
1. Unit unplugged or building circuit fuse is blown. (check, replace or reset fuse)  
2. Pump under pressure. (reduce pressure setting by turning pressure control knob counter-clockwise,  
trigger gun to relieve pressure).  
3. Too light or too long of extension cord. (replace with correct cord. If distance greater than 100 feet,  
obtain and install extra length of H.E.R.O. airless spray hose).  
4. Unit's thermal overload switch has opened. (determine and correct cause of overheating).  
ELECTRIC MOTOR STALLS/QUITS  
1. See "Electric Motor Won't Start/Run  
2. Drive belt is loose. (tighten drive belts by evenly turning belt tension bolts on either side of motor  
clockwise. Loose belts generally emit loud squealing noises).  
3. Unit primes, builds pressure, but pump “seizes” or “stops” when gun is triggered. ( loose belts, tighten).  
TOTAL LOSS OF PRESSURE, DIAPHRAGM MOVEMENT CANNOT BE STOPPED OR  
ALTERED. (SEE "DIAPHRAGM TEST")  
1. Paint too thick. (thin paint according to manufacturer's recommendations).  
2. Intake ball (ref# 13) worn or jammed opened/closed. (remove intake endcap (ref# 11) and cage (ref# 14).  
Inspect intake ball, (ref# 13), to ensure it is free, round, and has no nicks or cuts. Inspect ball cage and  
cage spring for damage or wear. Inspect for foreign material jamming ball. Replace parts as needed).  
3. Intake seat loose/bypassing. (remove intake endcap, (ref# 11) and ball cage, (ref# 14). Check seat to  
ensure it is tightly secured in endcap block. Remove intake elbow (ref# 8) and inspect block from the  
inbound direction. Look for any washout or erosion. Removal of seat may be required for positive  
identification of washout or erosion.  
4. Outgo valve ball (ref# 26) worn or jammed. (remove outgo valve, (ref# 22). Invert valve and unthread  
outgo valve upper, (ref# 29), from outgo lower, (ref# 23). Remove crush washer, (ref# 24), outgo seat,  
(ref# 25), outgo ball, (ref# 26), outgo cage, (ref# 27), outgo spring, (ref# 28), from outgo upper tunnel.  
Inspect outgo ball to ensure that it is round and free of nicks or cuts. Inspect for foreign material jamming  
ball. Inspect ball and cage for wear. Replace parts as needed).  
5. Outgo valve (ref# 22) incorrectly assembled. (disassemble and reassemble outgo valve, closely following  
detailed instructions on page 24).  
TOTAL LOSS OF PRESSURE, DIAPHRAGM HAS NO MOVEMENT OR MOVEMENT CAN BE  
STOPPED. (SEE "DIAPHRAGM TEST")  
1. Hydraulic intake valve (ref# 62) defective. (remove hydraulic feed line, (ref# 63), from hydraulic  
intake valve. Plug hydraulic feed line so hydraulic fluid does not drain. Remove hydraulic intake valve  
from elbow, (ref# 61). Check hydraulic intake valve to ensure that it flows in one way only, into the  
cylinder. Replace if necessary. NOTE; Item cannot be repaired ).  
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TROUBLESHOOTING  
SITUATION  
POSSIBLE CAUSE (REMEDY)  
TOTAL LOSS OF PRESSURE, DIAPHRAGM HAS NO MOVEMENT OR MOVEMENT CAN BE  
STOPPED...CONTINUED.  
2. Air lock created on hydraulic side of pump. (air entering hydraulic side due to loose hydraulic feed  
line fittings, (ref# 63), punctured hydraulic feed line, poor seal at hydraulic intake valve, (ref# 62), or  
elbow, (ref# 61). Tighten hydraulic feed line, test for leaks, or apply Teflon tape or pipe sealant on  
fittings. Purge air as per detailed instructions below).  
3. Pressure control valve ball (ref# 87) worn out/jammed. (remove hydraulic return line, (ref# 72), from  
pressure control valve fitting, (ref# 81). Remove pressure control valve, (ref# 73), from elbow, (ref# 61).  
Disassemble pressure control valve, by removing valve seat, (ref# 86), from body, (ref# 82). Inspect for  
and remove foreign material. Inspect ball for wear. Install pressure control repair kit, (ref# 88), if  
necessary).  
4. Piston rod (ref# 93) disconnected from piston (ref# 91). (reconnect piston rod following detailed  
instructions on page 28-29).  
NO PRESSURE, BLUE HYDRAULIC FLUID IN PAINT  
1. Diaphragm broken. (replace with complete diaphragm, (ref# 51). Closely follow detailed instructions on  
page 26. NOTE; If, and only if, paint has contaminated the hydraulic side of the pump, the entire  
hydraulic system must be cleaned and flushed. Make sure to remove and clean the hydraulic tank screen,  
(ref# 66), during this process. Refill only with genuine H.E.R.O. LVO hydraulic fluid.  
NOTE; If lacquer has contaminated the hydraulic system, the piston seal, (ref# 90), must be changed  
in addition to flushing the system. Closely follow detailed instructions on page 28-29).  
HYDRAULIC SIDE OF PUMP HAS BEEN REPAIRED AND REASSEMBLED, DIAPHRAGMNOT  
MOVING "PURGING"  
1. Air lock created on hydraulic side of pump. (when the hydraulic side of the pump is working there is no  
air in it. During repairs it is possible that air has been trapped in the hydraulic system. It must be removed  
or the pump will not work. To purge the air from the hydraulic system; remove the pressure control  
knob, (ref# 74), from the valve. Gently pull the P.C. stem, (ref# 77), out. It will pull out about 1/8".  
Remove the vented hydraulic cap, ref# 68), from the hydraulic tank, (ref# 65), and install accessory  
pressure cap, item 4-45-3. With a bicycle pump, apply a few pounds of air pressure to the hydraulic tank.  
This will force the oil through the hydraulic system and push out any of the trapped air. Wait a few  
minutes. Remove pressure cap and replace with vented cap. Restart the unit and install pressure control  
knob.  
NOTE: Unit may be running during purging procedure to speed up the procedure. If a pressure cap  
is unavailable, simply running the equipment for approximately 5-10 minutes with the P.C. stem  
pulled out, will purge the system).  
Accessory  
Item  
4-45-3  
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TROUBLESHOOTING  
SITUATION  
POSSIBLE CAUSE (REMEDY)  
PUDDLE OF OIL APPEARING UNDER SPRAYER DURING OPERATION  
1. Hydraulic fitting loose/cracked or hydraulic lines are punctured. (examine all hydraulic lines and fittings  
for cracks, breaks or looseness. Replace or tighten as required).  
2. Piston seals (ref# 90) worn. (remove and replace piston seals, following closely the detailed instructions  
on page 28-29).  
CORRECT STATIC PRESSURE, BUT REDUCED SPRAYING PRESSURE  
(Check with pressure gauge, see page 17 for details).  
1. Spray tip worn out/too large. (replace with new, correct sized spray tip. Tip most not exceed a newer  
condition .021 tip ).  
2. Paint hose incorrect. (replace hose with genuine H.E.R.O. airless spray hose (min. 50 feet). Steel braided  
hoses must not be used ).  
3. Intake valve seat (ref# 12) worn. (replace intake seat closely following detailed instructions on page 23).  
4. Intake ball (ref# 13) worn. (replace intake balls when signs of wear, deformation, nicks or cuts are  
evident. An out of round ball is the sign of a worn intake seat, (ref# 12), and both items should be  
replaced).  
5. Outgo seat (ref# 25) worn. (replace seat).  
6. Outgo ball (ref# 26) worn/damaged. (replace outgo ball).  
7. Prime valve (ref# 34) bypassing. (start sprayer. With prime valve closed tightly, handle, (ref# 43), turned  
clockwise fully, check prime valve return hose, (ref# 48), for material bypass. Repair prime valve using,  
(ref# 47), if material is bypassing.  
LOW STATIC PRESSURE, LOW SPRAY PRESSURE  
(Check with pressure gauge, see page 17 for details).  
1. Pressure control valve stem screw (ref# 79) loose. (remove pressure control knob, (ref# 74), and inspect  
screw for looseness. Screw should be secured to stem, (ref# 78), with Loc-Tite. If the screw turns  
independent of the stem than it must be re-secured. Secure unit so it will not move. Install pressure gauge  
and .021 spray tip. Obtain a piece of wood, to use as a pusher or purchase a pressure control adjustment  
tool, 27C-15. Remove pressure control screw and put some Loc-Tite 609 on threads. Turn the screw into  
the stem a few turns and push it in to its maximum and read pressure. Turn the screw in or out until 3000  
psi static pressure is obtained. If you obtain a pressure which higher than 3000 psi, trigger gun to release  
some pressure and continue adjusting screw until correct pressure is obtained. Let Loc-Tite set up.  
2. Pressure control ball (ref# 87) and/or seat (ref# 86) worn. (remove entire pressure control valve, (ref#  
73), from sprayer. Remove valve seat, ball, retainer, (ref# 85), and spring, (ref# 84), from valve. Replace  
with pressure control repair kit, (ref# 88). Hold valve body vertical while placing in spring, followed by  
retainer. Retainer should be below the valve body (approx. 3/8") when positioned correctly. Center ball  
on retainer, turn valve seat into body until finger tight, using pipe dope or Teflon tape to seal. Fully  
tighten using wrench. See page 30.  
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TROUBLESHOOTING  
SITUATION  
POSSIBLE CAUSE (REMEDY)  
FLUID BEING SPRAYED OUT OF TIP PULSATES, SPRAY HOSE LIES QUIET WHEN GUN  
TRIGGER CLOSED  
1. Spray tip worn out or too large. (replace with new tip of correct size. Tip must not exceed a good  
condition .021 tip ).  
2. Paint hose incorrect type. (replace with genuine top quality H.E.R.O. airless spray hose. Steel braided  
hose is not recommended ).  
3. Too short a length of hose. (minimum 50' of airless spray hose is required. Replace or add hose until a  
minimum of 50' is being used).  
FLUID BEING SPRAYED OUT OF TIP PULSATES, SPRAY HOSE CONTINUES TO MOVE  
VIGOROUSLY WHEN GUN TRIGGER CLOSED  
1. Outgo valve (ref# 22) assembled incorrectly. (remove the outgo valve and reassemble closely following  
the instructions on page 24).  
2. Outgo valve ball (ref# 26) worn out or jammed. (inspect outgo ball to ensure that it is round and free of  
nicks or cuts. Inspect for foreign material jamming ball. Inspect seat and cage for wear. Replace parts as  
required).  
PUMP SPRAYS WATER OR SOLVENT AT CORRECT PRESSURES, BUT WILL NOT SPRAY  
PAINT (Check with pressure gauge, see page 17)  
1. Air leak in paint intake siphon assembly. (check all fittings and hose clamps in intake assembly for  
tightness).  
2. Air leak in paint intake. (check for cracked or broken intake fittings. Swivel connector, (ref# 8), or hose  
barb, (ref# 7), may be damaged due to over tightening. Look for small black hairline fractures. Replace  
damaged parts).  
3. Partial blockage in paint intake siphon hose, (ref# 5) or siphon screen (ref# 2) (clean and remove any  
blockages from intake siphon hose or screen. Check to insure strainer bag is not clogging intake siphon  
hose or screen).  
SPRAYER DOES NOT PRIME WITH PAINT  
1. Heavy bodied paint, pump dry. (refer to " Operating Instructions" and follow priming instructions  
using the correct thinner for the paint you are to use).  
SPRAYER DOES NOT PRIME WITH CORRECT THINNER  
1. Pump completely dry. (pump may experience difficulty in priming when it is completely dry. First invert  
siphon tube and pour thinner into siphon tube, to help prime dry pump).  
2. Intake siphon assembly (ref# 1) has loose/damaged fittings, loose clamps, or damaged hose. (check all  
fittings, hose clamps, for tightness, siphon hose for damage or holes. Replace or tighten as required).  
3. Intake valve ball (ref# 13) stuck. (remove intake endcap, (ref# 11), and free ball and reassemble).  
4. Outgo valve ball (ref# 26) stuck. (remove outgo valve, (ref# 22). Unthread outgo valve upper body, (ref#  
29), from outgo body lower, (ref# 23). Remove outgo seat, (ref# 25), from upper body. Free ball and  
reassemble following detailed instructions on page 24).  
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TROUBLESHOOTING  
SITUATION  
POSSIBLE CAUSE (REMEDY)  
SPRAY MATERIAL LEAKS AT PRIME VALVE STEM  
1. Prime valve stem packings (ref# 38 or 39) defective. (replace damaged packings following detailed  
instructions on page 25.  
SPRAY MATERIAL LEAKS OUT PRIME VALVE HOSE WITH VALVE CLOSED  
1. Prime not closed tightly. (tighten valve handle (ref# 43) further)  
2. Prime valve worn. ( install prime valve repair kit, (ref# 47). See page 25 for detailed instructions.)  
SPRAY PATTERN IS SPOTTY OR UNEVEN  
1. Pressure is too low. (increase pressure slowly until problem is corrected ).  
2. Spray material too thick. (thin as recommended by material manufacturer).  
3. Plugged siphon screen, siphon tube, gun filter or a combination. (inspect and clean or replace as  
required).  
4. Plugged tip. (remove and clean tip).  
5. Pump malfunctioning or unsuitable for the material. (refer to other areas of troubleshooting guide and  
check material requirements vs 300S/SL output abilities).  
SPRAY PATTERN LEAVES LINES OR FINGERS  
1 Pressure too low. (increase pressure slowly until problem is corrected).  
2 Worn tip. (replace tip).  
3 Tip too small for spray material. (change to larger tip or increase pressure. See material manufacturers  
recommendations).  
EXCESSIVE OVERSPRAY OR FOGGING  
1. Pressure too high. (reduce pressure as required).  
2. Material too thin. (follow material manufacturers recommendations re-thinning).  
3. Tip too large. (reduce tip size).  
4. Improper application technique. (refer to proper application techniques on page 10-11).  
5. Too windy. (wait for wind to let up).  
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REPLACEMENT OF INTAKE SEAT  
Tools or Supplies Required  
¨
¨
1/4 Allan wrench  
Torque Wrench  
¨
¨
5/8 Socket  
Hammer  
¨
¨
Loc-Tite 609  
¨
¨
Crescent Wrench  
Vise – Optional  
Lacquer Thinner  
1. Remove the four bolts (ref# 9), securing the intake endcap (ref# 11) to  
the pump.  
2. Remove the ball cage (ref# 14), ball (ref# 13) and elbow (ref# 8) from the  
endcap.  
11  
3. Place endcap on work bench, with external side facing up.  
4. Use socket or screw driver and hammer to gently tap out seat.  
5. Remove any Loc-Tite residue from the area from which the seat was  
removed. Inspect for any signs of wear or erosion in this area. If wear or  
erosion is found, discard the entire endcap and replace with 4-4B.  
6. Use lacquer thinner to clean both the seat and endcap in the area where  
the seat will be positioned.  
7. The fit of the seat to endcap is very tight. To aid in the installation, place  
the endcap in very hot water and the seat in very cold water. The heat  
causes the endcap to expand and the cold causes the seat to contract,  
making installation easier.  
8
9
Socket  
8. Dry off seat and endcap.  
9. Apply Loc-Tite 609, around the outside of seat and in the machined area  
where the seat will rest.  
Seat ( ref# 12 )  
10. Slip seat into the endcap. The seat should rest flush with or slightly  
below the surrounding area, when correctly installed. Use a wooden or  
nylon dowel to gently tap into place if the seat did not fall into place  
fully. Use caution as the tungsten carbide seat is very brittle, ( yet  
strong ) and may chip or break. NOTE: If the seat will not fit into the  
endcap using the heating /cooling method;  
Clean, free  
of defects  
A. Follow steps 6 & 8.  
B. Place seat into endcap and put 5/8” socket against seat.  
C. Place entire assembly into vise, with endcap against one vise jaw and  
the socket against the other.  
D. Tighten the vise and it will work as a press to force the seat into the  
endcap.  
11. Use a steel punch and punch four(4) new marks around the newly  
installed seat. The punch marks help to expand the metal around the seat,  
giving a firmer grip.  
12. Allow the endcap to sit for at least 12 hours while the Loc-Tite cures.  
13. Always install a new intake ball (ref# 13) after replacing seat.  
14. Install intake cage, ensuring a minimum 1/32” clearance between ball  
and cage sides.  
Clearance  
15. Install intake elbow (ref# 8), ensuring elbow is in line with cage.  
16. Install intake valve, using the four bolts removed in step 1.  
17. Torque to 30 foot pounds, using criss-cross pattern.  
Cross Section View  
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OUTGO VALVE  
Tools or Supplies Required  
5/8” Open end wrench  
¨
¨
¨
Vise  
¨
11/16” Open end wrench ¨ 1” Open end wrench  
Outgo  
swivel  
Teflon Tape or pipe sealant.  
ref# 30  
1 Open prime valve, (ref# 34) in order to release pressure from the material side of  
pump.  
2 Remove pressure control knob, (ref# 74) and pull P.C. stem, (ref# 77) out to internal  
stop, thereby releasing hydraulic pressure.  
29  
3 Disconnect outgo tee, (ref# 33) from outgo swivel, (ref# 30) on the outgo valve.  
4 Remove outgo valve from machine by turning counter clockwise.  
5 Invert valve and secure upper part of valve, (ref# 29) in vise.  
6 Remove lower half of valve, (ref# 23).  
7 Remove crush washer, (ref# 24), seat, (ref# 26), ball, (ref# 26), cage, (ref# 27) and  
spring, (ref# 28). Clean and inspect all parts for wear. Replace any worn parts.  
8 Apply Teflon tape to threads of outgo upper body.  
9 Place spring, large end first, into outgo body. Spring should fit into slot machined 28  
into tunnel.  
10 Place cage onto spring, with open end up.  
NOTE: Cage should be open so that it drags down the sides of the tunnel during  
installation. If closed too much it will trap the ball and cause pulsation in spray 27  
pattern.  
11 Place ball into cage.  
12 Install seat, beveled side down to ball. Seat should fit snugly into outgo body. Press  
on seat to ensure it will compress until it is flush with outgo body. Release slowly to  
26  
25  
ensure the parts do not dislodge themselves.  
13 Place crush washer on seat. Replace crush washer if badly crushed.  
14 Thread outgo lower onto outgo upper until finger tight. Tighten 1/2 turn with 24  
wrench. NOTE: Teflon tape or pipe sealant should be used.  
15 Attach repaired valve to machine, installing a new crush washer, (ref# 21) following  
steps 3-4 in reverse order.  
23  
SPECIAL NOTES:  
¨
¨
To check the ball for wear, place against a new seat and check sealing edge against a  
bright light.  
A used seat may be checked in a similar manner using a new ball. Replace used part  
if light pass at sealing edge.  
21  
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REPAIR OF BLEED VALVE  
Tools or Supplies Required  
¨
¨
Vise  
¨
5/8 Open end wrench  
¨
3/4 Open end wrench  
9/16 Open end wrench ¨ Teflon Tape, optional* ¨ Loc-Tite, optional **  
44  
41  
42  
35  
43  
36  
24  
26  
37  
40  
47  
38  
Bleed Valve Repair Kit Installation  
39  
1. Open bleed valve (ref # 34), turning handle counter-clockwise to release pressure from material side of  
pump.  
2. Remove bleed valve return hose, (ref # 48) from bleed valve return fitting, (ref # 44).  
3. Place wrench on bleed valve connector, (ref # 35). Turn counter-clockwise to remove valve from outgo  
tee, (ref # 33).  
4. Secure valve vertically in vise, clamping vise jaws on the flats of valve nut ( ref # 36 ). See picture above.  
5. Use wrench to remove valve housing (ref # 41) from nut, (ref # 36).  
6. Remove ball, (ref # 37 ), seat, (ref # 26) and crush washer, (ref # 24).  
7. Install new crush washer and seat, ( ensuring the beveled surface of seat is facing out ) into the bleed valve  
nut ( ref # 36 ). Place new ball into bevel of seat.  
8. Re-install valve housing ( * Use of Teflon Tape or pipe sealant is optional ). Tighten 1/4 turn past finger  
tight. If leakage occurs at this junction point during operation, tighten 1/4 turn more or until leakage stops.  
9. To install new valve stem, or valve stem seals, (ref # 38 or 39), continue at step 9 .  
10. Complete steps 1 to 5 from above.  
11. Place valve housing in vise.  
12. Use 1/2” wrench to loosen jam nut ( ref # 42 ), and remove handle.  
13. Remove jam nut from valve stem ( ref # 40 ), and unthread valve stem down through housing.  
14. Remove existing o-ring and washer ( ref # 38 & 39 ) from stem. Replace with new parts, ensuring they are  
installed in the correct order on stem. Refer to diagram.  
15. Thread stem back into housing until all threads are used. Thread jam nut on to valve stem.  
16. Re-assembly valve. Refer to steps 6 to 8 from instructions above.  
17. Thread handle onto valve stem. Allow stem to thread down onto ball ( internally ). Tighten handle firmly.  
Hold handle while tightening jam nut ( Ref # 42 ) tightly against handle. ( ** Use of Loc-Tite is optional )  
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DIAPHRAGM REPLACEMENT  
Tools or Supplies Required  
¨
¨
1/4 Allan wrench  
1/8 Allan wrench  
¨
¨
4-45-3 Pressure cap  
¨
¨
Torque Wrench  
Rags  
¨
¨
3/8” Open end wrench  
Drip / collection tray  
H.E.R.O. hydraulic oil  
Items marked  
with * are  
included in  
4-22CRK  
D*  
B*  
C*  
F*  
C*  
Repair Kit  
Small steel  
Plate “E”  
Large steel  
Hub “A”  
1. Tilt unit up onto its’ nose ( resting vertically on handle, ref# 130). See Fig. 1, page 27.  
2. Remove the eight bolts ( ref# 17) securing the paint head ( ref# 18) to the hydraulic head ( ref# 53).  
3. Remove diaphragm ( ref# 51) from the hydraulic head.  
4. If the diaphragm’s metal hubs are rough or sharp, replace with complete diaphragm. Continue at  
step 11.  
5. If the diaphragm’s hubs are smooth and unworn, replace with repair kit ( ref# 52).  
6. Dismantle old diaphragm.  
7. Slide “large” steel hub (A) onto new screw (B) provide in kit. The screw should fit in counter sunk  
hole, leaving the flat side of hub facing away from screw head.  
8. Thread the small nylon disc (C), diaphragm pad (D) and second small disc (C) onto the screw.  
There is no correct side to the pads. They MUST be threaded on to avoid leakage due to the hole  
being enlarged.  
9. Slide the smaller hub (E) onto the screw, being certain the beveled edge of the plate is next to the  
nylon pads. During operation the diaphragm flexes over the beveled edge. If reversed, ( flat edge  
against diaphragm ) the diaphragm will be cut on the sharp edge while in operation. Thread on and  
tighten nut (F), supplied in kit. DO NOT re-use old nut.  
10. Fill the hydraulic head cavity with genuine H.E.R.O. hydraulic oil, before placing diaphragm onto  
hydraulic head.  
11. Place new or repair diaphragm onto hydraulic head with the large hub facing up ( Screw head  
visible ). Ensure diaphragm is centered and within the hydraulic head’s recessed area.  
12. Place paint head / endcap assembly onto the hydraulic head. Ensure correct orientation.  
13. Install mounting bolts, and using a criss-cross pattern, tighten bolts to 30 foot pounds.  
14. Purge hydraulic oil system per instructions on page 19.  
¨
The diaphragm will take on a wrinkled or puckered appearance almost immediately after operation  
begins. Do Not be concerned by this. A diaphragm requires replacement when hydraulic oil appears  
in the spray material. Annual replacement of the diaphragm is recommended as part of your  
preventive maintenance procedures.  
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HYDRAULIC HEAD INSERT REPLACEMENT  
Tools or Supplies Required  
¨
¨
1/4 Allan wrench  
Vise  
¨
¨
4-45-3 Pressure cap  
¨
¨
Torque Wrench  
Rags  
¨
17S Balls ( 2 ) Slightly  
used. May damage new.  
H.E.R.O. hydraulic oil  
Fig. 1  
17  
18  
53  
Fig. 2.  
Fig. 3  
This small lip  
will roll over  
to secure  
Insert  
23A-1  
Steel ball  
( 17S )  
59  
130  
Vise  
jaws  
Vise  
jaws  
1. Tilt unit up onto its’ nose ( resting vertically on handle, ref# 130). See Fig. 1.  
2. Remove the eight bolts ( ref# 17) securing the paint head ( ref# 18) to the hydraulic head ( ref# 53).  
3. Place rags around the cylinder area to absorb hydraulic oil which will leak while performing step 4.  
4. Remove the six bolts ( ref# 59 ) securing the crossblock/cylinder/hydraulic head. Bolts are  
accessed from the underside of crossblock.  
5. Remove hydraulic head ( ref# 53) to work bench.  
6. Remove old, broken or damaged insert ( ref# 55).  
NOTE: Insert should have no movement, when properly installed. If it is spinning or able to  
move back and forth, but has not come completely free of the hydraulic head, it may be possible  
to re-tighten using the same installation instructions to follow. See steps 8 – 10.  
7. Place new insert into the hydraulic head. See fig. 2. Insert will protrude through the hydraulic head  
by approximately 1/8”. To affix the insert the extra material of the insert must be flared to secure to  
the hydraulic head.  
8. Position a steel ball on the front and back of the insert. See figure 3.  
9. Position this assembly in the jaws of a vise.  
10. Slowly close the vise jaws. The vise acts as a press and the ball will cause the extra insert material  
to flair around the head. Continue closing vise until the insert is tight and can no longer be rotated  
or spin in the hydraulic head. Over tightening can create cracks or splits in the flange/flare, leading  
to repeat failures. Do Not over tighten.  
11. Re-assemble pump, in the reverse order of removal. Torque all bolts to 30 foot pounds.  
12. Once the repairs are completed , return unit to horizontal position, replenish lost oil and purge per  
instructions on page 19.  
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PISTON REPAIRS  
Tools or Supplies Required  
Golf tee  
¨
¨
¨
¨
Vise  
¨
¨
¨
¨
Grease  
9/16 Open end wrench  
1/2 Socket  
Pick or dental tool.  
Torque Wrench  
H.E.R.O. hydraulic oil.  
4-45-3 Pressure cap  
¨
¨
¨
¨
Circlip pliers  
Three(3)  
per side  
Ref# 114  
A
B
C
88  
87  
89  
86  
1. Remove hydraulic feed line, (ref# 63) from hydraulic intake valve, (ref# 62) and also remove hydraulic  
return line, (ref# 72) from the pressure control valve, (ref# 73). Plug lines to minimize oil loss. (Hint; golf  
tees work well for this)  
2. Remove the bolts, (ref# 114) passing through the side frames, (ref# 110,111), into the crossblock, (ref#  
60).  
3. Place a drain tray under cylinder area.  
4. Grasp the pump assembly, and pull away from the piston. Stop when piston pulls free, to allow the  
hydraulic oil to drain into pan. Completely remove pump assembly from between side frames.  
5. If only replacing piston seals, (ref# 90) continue at step 15.  
6. Remove the piston, (ref# 89) from eccentric bearing, (ref# 98). Move to clean work bench for repairs.  
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PISTON REPAIRS  
7. Remove piston circlip, using circlip pliers. Remove piston from rod.  
NOTE: Use extreme caution not to damage circlip or the internal circlip groove of piston. Piston rod  
circlip, washer, o-ring, and nut are not available individually. Parts are available with the purchase of  
piston rod, (ref# 93) only. The circlip will have one sharp edge and one smooth edge. The smooth edge  
should be towards the washer. If reversed, the rod will continually pull out of the piston.  
8. Remove bronze piston rod seat, (ref# 92) from piston, (ref# 91).  
9. Examine all parts for wear or damage. Replace as required.  
10. Fill the center cavity of piston rod seat until flush with grease. Slide seat into piston with concave side  
(filled with grease) facing out.  
11. Lightly grease the ball end of piston rod. Push piston rod into piston until ball end of rod contacts seat.  
12. Slide o-ring and steel washer down rod and into piston. Slide circlip down into piston and snap into the  
internal circlip groove of piston using circlip pliers.  
NOTE: Circlip must fully expand into groove of piston. Circlip has fully expanded when there is 13/64"  
space between circlip eyelets.  
12.NOTE: If you experience difficulty installing circlip, remove a small quantity of grease. When  
installed correctly, rod should move slowly and without any free play.  
13. If piston seals, (ref# 90) are required, they may be installed now or after piston has been re-attached.  
14. Thread rod into eccentric bearing holder, (ref# 98) until nut is flush with eccentric bearing. Tighten  
snugly.  
NOTE: Piston rod nut must remain fully threaded onto rod, if during installation, the nut begins to  
loosen from rod, re-tighten to rod. Place vise grips on rod to assist in tightening piston rod into  
eccentric.  
15. Remove and discard old piston seals.  
16. Piston seal kits, (ref# 90) contain a total of four pieces (1 o-ring, 1 flat washer, 2 cup washers). Take note  
of their installation sequence by referring to drawing. The piston has three machined grooves, which  
have been marked on the drawing as A, B, & C.  
17. Place flat washer (one side has a contoured face) into groove "C", then place o-ring in front of flat  
washer, so that it fits into the contoured face of the flat washer.  
18. Place one cup washer into groove "B", with open face of cup washer facing the end of piston. (towards  
hydraulic oil when installed)  
19. Place second cup washer into groove "A".  
NOTE: Always work from the front of the piston back so that you are always moving the cup  
washers over filled grooves. This avoids damage that can occur to the cup washers if they have to be  
dug out of one groove and moved to another. Avoid over stretching.  
NOTE: A small, dental like tool, may be used to assist in moving cup washers.  
20. Apply grease to seals before installing in cylinder, (ref# 57).  
21. Slide pump assembly into side frames and guide piston into cylinder  
NOTE: Use care not to push the piston too far into cylinder. If piston rings slide in too far they will  
pass through cylinder into the hydraulic cavity. Complete dismantling of piston will be required to  
remove. The piston can not be pulled back if the seals have gone through cylinder.  
22. Reattach crossblock bolts, as removed in step 2. Torque bolts to 30 foot pounds.  
23. Reconnect hydraulic lines, as removed in step 1.  
24. Add new hydraulic oil to hydraulic tank, using only genuine H.E.R.O. LVO hydraulic oil.  
25. Once the repairs have been completed, the hydraulic oil will require purging to remove the trapped air.  
See "PURGING" instructions on page 19.  
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PRESSURE CONTROL VALVE  
77  
88  
81  
74  
76  
79  
82  
78  
80 83  
84  
85 86 87  
Tools or Supplies Required  
11/16” Open end wrench  
1” Open end wrench  
¨
¨
¨
Vise  
7/16” Open end wrench  
¨
¨
¨
¨
H.E.R.O. hydraulic oil  
4-45-3 Pressure cap  
Teflon Tape or pipe sealant, optional *  
1 Remove pressure control knob, (ref# 74) and pull P.C. stem, (ref# 77) out to the internal stop (1/16" to  
1/8") thereby releasing hydraulic pressure.  
2 Remove hydraulic return line, (ref# 72) from P.C. fitting, (ref# 81).  
3 Place 11/16" wrench on P.C. seat, (ref# 87). Turn counter-clockwise to remove complete valve.  
4 Place complete valve in vise and remove seat from body, (ref# 81).  
5 Remove ball, (ref# 86), retainer, (ref# 85), and spring, (ref# 84) from body. Inspect ball for nicks or cuts  
and replace if damaged. Inspect seat at sealing edge, for signs of wear. A good condition seat will have a  
very small beveled at the sealing edge. The larger the bevel the more wear has taken place. Inspect  
retainer for wear. The retainer has a small locating hole in it. The hole should be flush or slightly  
beveled. The greater the wear on the ball, seat, and retainer the poorer the static pressure will be. Replace  
parts individually, or use repair kit, (ref# 88).  
6 Hold P.C. body vertical. Place spring into body, place retainer onto spring. Ensure retainer fits  
completely over spring. Retainer should rest below end of body by approximately 1/4" to 3/8". Place ball  
onto retainer, ensuring ball is located on center hole.  
7 Thread on seat, using care not to dislodge the ball from its position on the retainer. Tighten firmly.  
8 Apply pipe dope or Teflon tape to exterior threads of seat. Install into elbow. Tighten to prevent leaks  
and return to original position.  
9 Reattach hydraulic line. See "PURGING" instructions on page 19.  
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ACCESSORIES  
1/4x1/4  
Hose to Hose Connector  
114  
Paint Hose, 50’ x 1/4”  
3-Whipend  
10-55-011-2  
10-55-011-4  
10-55-300-2  
10-55-300-4  
5GAL SB-25  
4-649  
Whipend, 3’ x 3/16”  
ASM Gun, Model 400, 2 Finger Trigger, c/w 1710 Zip Tip  
ASM Gun, Model 400, 4 Finger Trigger, c/w 1710 Zip Tip  
ASM Gun, Model 300, 2 Finger Trigger, c/w 1710 Zip Tip  
ASM Gun, Model 300, 4 Finger Trigger, c/w 1710 Zip Tip  
Strainer Bags, 5 Gallon, 25 per Carton  
Wonder Wash, 1.5 ounce, 48 per Carton  
Wonder Wash, 5 ounce, 25 per Carton  
Wonder Wash, 5 lbs. Bulk  
4-655  
4-660  
4-662  
Wonder Coat, 1 Liter Bottle  
4-664  
Wonder Coat, 12 x 4-662 Carton  
661  
Spray Trigger, for use with 4-662  
4-666  
Wonder Coat, 4 Liter Bottle ( Refill )  
Hydraulic Oil ( LVO ), 1 Liter Bottle  
Hydraulic Oil ( LVO ), 4 Liter Bottle  
Pressure Gauge, c/w Mounting Tee  
Pressure Cap  
4-LVO-1  
4-LV0-4  
4-67/19  
4-45-3  
10-QRP-3  
10-QRP-5  
10-QRP-8  
BB-010  
Quick Reach Extension Pole, 3 Feet  
Quick Reach Extension Pole, 5 Feet  
Quick Reach Extension Pole, 8 Feet  
“Bucket Buster” Plastic Pail Opener  
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PARTS LIST  
Please order parts by the appropriate part number and not by reference number.  
The quantity required, per unit, is shown for each part number. Part numbers in bold text indicate  
whole assemblies or kits. These parts may also be purchased individually  
INTAKE PARTS  
REF  
PART #  
4-210  
DESCRIPTION  
SIPHON ASSEMBLY COMPLETE, ( Ref# 2-7, 48-50 )  
SCREEN, Siphon, Coarse, Includes  
Not Used  
QTY  
ASSY  
1
1
2
3
4
5
6
7
8
9
187A  
189A-1  
4-184A  
1/75-3  
667-27  
667-26  
3B  
TUBE, Siphon, Metal, 5 Gal.  
HOSE, Siphon, 21”L x 3/4” ID, Lacquer Resistant  
CLAMP  
1
1
2
BARB, Hose to Elbow, 3/4”  
1
ELBOW, 3/4”  
1
CAPSCREW, SKT HD 3/8NC x 2”, Gr. 8  
WASHER, 3/8" Hi Collar Lock  
ENDCAP, Includes ref# 12  
4
10 3-2  
11 4-4B  
12  
4
ASSY  
6
SEAT, 3/4” Tungsten Carbide  
1
1
13 17S  
BALL, 3/4”, Steel, Corrosion Resistant,  
Use with spring cage ( 4-183S )  
14 4-183S  
15 19A  
16 5V  
CAGE, Spring Loaded, Use with steel ball ( 17S )  
SPRING  
1
1
O-RING, Viton  
1
17  
3
CAPSCREW, SKT HD, 5/16 x 1-3/4"  
HEAD, Material / Paint  
8
18 21E  
1
19 4-6652  
20 4-6653  
REPAIR KIT ( Ref# 13 (2), 14-16 )  
OVERHAUL KIT ( Ref# 12, 13 (2), 14-16 )  
KIT  
KIT  
OUTGO PARTS  
21 7C  
WASHER, Copper Crush  
OUTGO VALVE COMPLETE, ( Ref# 23-30)  
LOWER, Valve Body  
WASHER, Copper Crush  
SEAT, 3/8, Tungsten Carbide  
BALL, NYLON, 3/8  
1
22 4-11A  
23 11A-1  
24 11A-3CP  
25 11A-4  
26 11A-5  
27 11A-6  
28 11A-7  
29 11A-2  
ASSY  
1
1
1
1
1
1
1
CAGE  
SPRING  
UPPER, Valve Body,  
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PARTS LIST  
Please order parts by the appropriate part number and not by reference number.  
The quantity required, per unit, is shown for each part number. Part numbers in bold text indicate  
whole assemblies or kits. These parts may also be purchased individually  
OUTGO PARTS  
REF  
30 20  
PART #  
DESCRIPTION  
QTY  
SWIVEL  
1
31 4-6654  
32 4-6655  
33 13-1  
REPAIR KIT ( ref# 21, 24, 26(2), 27-28 )  
OVERHAUL KIT ( ref# 21, 24, 25, 26(2), 27-28 )  
TEE, Female x Male x Male  
BLEED VALVE COMPLETE ( Ref# 35-46 )  
CONNECTOR, 1/4 x 1/4  
KIT  
KIT  
1
34 4-606  
35 14A  
ASSY  
2
1
36 606-2  
37 11A-5  
38 606-8  
39 606-15  
40 606-10  
41 606-1  
42 HW4053  
43 4-606-9  
44 603-6  
45 603-12  
46 606-12  
47 4-606RK  
48 4-185B  
49 196  
NUT, Bleed Valve  
Ball, 3/8, Steel  
1
O-RING, Bleed Valve, Stem  
WASHER, Back – Up  
1
1
STEM, Bleed Valve  
1
HOUSING, Bleed Valve  
1
JAM NUT, 3/8 NC  
1
HANDLE, T, Complete with pin  
BARB, Hose  
1
1
DECAL, Bleed Valve “Close Tightly After Prime”  
LABEL, Bleed Valve “Max WPR 4000 PSI”  
REPAIR KIT, Bleed Valve ( Ref# 24, 25, 37 )  
HOSE, P.V. Return Line  
1
1
KIT  
1
CLAMP  
1
50 188  
TIES  
2
HYDRAULIC PARTS  
51 4-22C  
52 4-22CRK  
53 4-23A-2  
54 4-23A  
55 23A-1  
DIAPHRAGM ASSEMBLY  
REPAIR KIT, Diaphragm ( Diaphragm less steel plates )  
HEAD ASSEMBLY, complete with insert. ( ref# 54-55 )  
HEAD, Hydraulic.  
1
KIT  
ASSY  
1
1
1
1
6
6
INSERT, Head, 3/4” cylinders only  
O-RING  
56  
5
57 24/75  
58 HW5050P  
59 36  
CYLINDER, 3/4"  
WASHER, 5/16" SAE, Plated  
CAPSCREW, SKT. HD., 5/16NC x 2-3/4"  
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PARTS LIST  
Please order parts by the appropriate part number and not by reference number.  
The quantity required, per unit, is shown for each part number. Part numbers in bold text indicate  
whole assemblies or kits. These parts may also be purchased individually  
HYDRAULIC PARTS  
REF  
PART #  
DESCRIPTION  
QTY  
60 35A  
CROSSBLOCK, Aluminum  
1
61 25-2  
ELBOW  
3
62 4-30  
VACUUM VALVE  
1
63 4-31  
FEED LINE, LVO, C/W Fittings, Includes ref# 64  
ORIFICE, Metering  
1
64 31-1  
1
65 4-45A  
66 4-45-1  
67 45-4  
TANK, Complete With Fittings, (ref# 66-68)  
SCREEN, Tank  
ASSY  
1
ELBOW, Return  
1
68 4-45-2  
69 45B  
LID, Vented, Hydraulic Tank  
BRACKET, Tank  
1
1
70 HW1010P  
71 45C  
CAPSCREW, HX HD, 1/4NC x 1/2  
STRAP  
2
2
72 4-28  
RETURN LINE, LVO, C/W Fittings  
PRESSURE CONTROL VALVE, Complete ( Ref# 74-87 )  
KNOB, P.C., Includes Ref# 75  
SETSCREW, SKT. HD. 5/16 NC x 5/16"  
LOCK NUT, Aluminum, P.C.  
STEM ASSEMBLY ( Ref# 78-80 )  
STEM, P.C.  
1
73 4-27C  
74 4-27C-7  
75 HW2010  
76 27C-6  
77 4-27C-10  
78 27C-10A  
79 27C-10B  
80 27C-12  
81 4-27C-11  
82 27C-8  
83 27C-9  
84 27C-5  
85 27C-4  
86 27C-3  
87 27C-2  
88 4-27CRK  
89 4-38A/75  
90 4-37A/75  
91 4-38A/75-1  
ASSY  
ASSY  
1
1
ASSY  
1
SCREW, Stem, P.C.  
1
O-RING, P.C.  
2
FITTING, Oil Return, P.C.  
BODY, P.C.  
1
1
CIRCLIP, P.C.  
1
SPRING, P.C.  
1
RETAINER, P.C.  
1
SEAT, 38-40RC, P.C.  
1
BALL, Steel  
1
KIT  
ASSY  
1
REPAIR KIT, Ref# 84-87  
PISTON & ROD ASSEMBLY, 3/4" ( Ref# 90-93 )  
SEAL SET, Piston, 3/4"  
PISTON, Only, W/O Seals, 3/4"  
1
H.E.R.O. INDUSTRIES  
300S / 300SL LEGEND Owner’s Manual  
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PARTS LIST  
Please order parts by the appropriate part number and not by reference number.  
The quantity required, per unit, is shown for each part number. Part numbers in bold text indicate  
whole assemblies or kits. These parts may also be purchased individually  
HYDRAULIC PARTS  
REF  
PART #  
DESCRIPTION  
QTY  
92 38A-3  
SEAT, Piston, Bronze  
1
1
93 4-38A-2  
ROD, Piston, C/W Nut, Washer, O-Ring, Circlip  
DRIVE PARTS  
BEARING, Crankshaft Side  
LT. CARRIAGE, 5/16NC x 5/8"  
WASHER, Lock, 5/16  
94 05-80-5000  
95 HW1055  
96 HW5060P  
97 HW4030P  
98 4-39  
2
4
4
4
NUT, HX. HD, 5/16  
ECCENTRIC BEARING & HOLDER, C/W Zerk, Ref# 99,100 ASSY  
99 39-2  
BEARING, Eccentric, Outer  
1
100 4-39-3  
101 4-41  
Holder, Eccentric, C/W Zerk  
1
CRANKSHAFT, Includes Ref# 102  
RACE, Eccentric, Inner  
ASSY  
102 39-1  
1
103 4-46  
KEEPER PLATES, with hardware  
KEYSTOCK, 3/16 SQ x 1.5"  
ASSY  
104 4-49  
2
1
2
1
1
1
105 4-65/100  
106 HW2020  
107 66/100  
108 4-48/100  
109 4-61/74  
65/101M  
SHEAVE, Pump, C/W Set Screws (2), ref# 105  
SET SCREW, SKT. HD., 5/16 NC x 7/16  
BELT  
SHEAVE, Motor, C/W Set Screws ( See Ref# 105 )  
MOTOR, 1.0 H.P., Doerr Motor, Includes Switch, Cord.  
SWITCH, On/Off, Doerr Motors, Push on Connectors  
FAN, Doerr Motors  
61/105  
61/106  
CLIP, Fan, Doerr Motors  
61/107  
COVER, Fan, Doerr Motors  
CHASSIS PARTS  
110 4-53  
FRAME, Left Side  
1
1
2
6
6
1
111 4-52  
FRAME, Right Side  
112 58  
BRACKET, Motor Cord Wrap  
WASHER, 5/16 SAE  
113 HW5050P  
114 HW1050P  
115 4-51  
CAPSCREW, HX. HD., 5/16NC x 1/2"  
ROD, C/W Clips ( Includes Ref# 116 )  
H.E.R.O. INDUSTRIES  
300S / 300SL LEGEND Owner’s Manual  
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PARTS LIST  
Please order parts by the appropriate part number and not by reference number.  
The quantity required, per unit, is shown for each part number. Part numbers in bold text indicate  
whole assemblies or kits. These parts may also be purchased individually  
CHASSIS PARTS  
REF  
PART #  
DESCRIPTION  
QTY  
116 59  
E-CLIP  
2
1
2
2
1
2
117 4-50  
BRACKET, Motor Mounting, Includes Ref# 118-119  
CAPSCREW, HX. HD., 5/16NC x 1-1/4", Gr. 5, Full Thread  
NUT, Hex Jam, 5/16"  
118 HW1070F  
119 HW4040  
120 4-67/13B  
121 4-67/14  
122 HW1020P  
123 HW5030P  
124 HW5040P  
125 HW4020P  
126 4-66/12-1  
127 66/10-1  
128 66/10BM-1  
129 HW1010P  
130 4-1/75-3  
131 67/16A  
LEG  
FOOT PAD, c/w ref# 124, 125  
CAPSCREW, HX HD, 1/4NC x 3/4, PLATED  
WASHER, 1/4 SAE, PLATED  
WASHER, 1/4 Regular Lock, PLATED  
NUT, 1/4NC HX, PLATED  
BELTGUARD ASSEMBLY, c/w ref# 127 & 128, BLACK  
BELTGUARD, BLACK  
ASSY  
1
1
2
1
2
2
FINGER GUARD  
CAPSCREW HX HD, 1/4NC x 1/2, PLATED  
FRAME HANDLE  
WHEEL, 8 1/4”  
132 67/17  
COTTER PIN  
300S ONLY CHASSIS PARTS  
AXLE  
133 210-1  
134 67/12  
135 211  
1
1
1
1
1
1
1
1
1
1
HANDLE GRIP  
HANDLE  
136 212  
SPRING CLIP  
137 213  
PIN  
138 HW1092P  
139 HW5072P  
140 HW4062P  
141 HW4060P  
142 214  
CAPSCREW, HHCS, 7/16NC x 2-1/4, PLATED  
WASHER, 7/16, L9 TENSION  
NUT, STOVER, 7/16  
NUT, 7/16NC HSF  
SIPHON HOLDER  
300SL ONLY CHASSIS PARTS  
HANDLE, SNAP ON  
143 2/78  
144 198  
1
1
AXLE  
H.E.R.O. INDUSTRIES  
300S / 300SL LEGEND Owner’s Manual  
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PARTS SCHEMATIC  
300S / 300SL LEGEND  
48  
300SL  
50  
6
1
5
4
143  
122  
49  
6
7
2
144  
124  
127  
128  
125  
126  
134  
133  
8
130  
122  
122  
122  
135  
131  
123  
142  
137  
122  
124  
125  
141  
140  
132  
136  
139  
138  
120  
124  
121  
125  
H.E.R.O. INDUSTRIES  
300S / 300SL LEGEND Owner’s Manual  
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PARTS SCHEMATIC  
300S / 300SL LEGEND  
H.E.R.O. INDUSTRIES  
300S / 300SL LEGEND Owner’s Manual  
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Manufactured by:  
H.E.R.O. INDUSTRIES  
2719 LAKE CITY WAY  
BURNABY, B.C.  
CANADA  
Phone: 604-420-6543  
800-494-4376  
Fax:  
604-420-8725  
Purchased From  
__________________________  
__________________________  
__________________________  
__________________________  
Model: __________________  
Serial #: _________________  
Date of Purchase:  
H.E.R.O. INDUSTR
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