781SS-871SS 97-6642 0410 - ETS Company Pressure Washers ...

MODELS 781SS, 

871SS, 921SS 

OPERATING INSTRUCTIONS 

AND PARTS MANUAL 

Thank you for purchasing a Hotsy Pressure Washer. This manual covers the operation and maintenance 

of your pressure washer. All information in this manual is based on the latest product information 

available at the time of printing. Hotsy, Inc. reserves the right to make changes at any time without 

incurring any obligation. 

Read instructions carefully before attempting to assemble, install, operate or service this pressure 

washer. Failure to comply with instructions could result in personal injury and/or property damage! 

LISTED 

® 

SERIAL NUMBER: 

DATE PURCHASED: 

FOR SALES AND SERVICE, PLEASE CONTACT:

781SS SPECIFICATIONS 

● Pump Volume At Pump Head: 2.5 GPM/150 GPH 

● Pump Pressure At Pump Head: 2000 PSI 

● Burner Type: Fuel Oil Fired, 248,500 BTU/Hr. 

● Burner Fuel Pressure: 140 PSI 

● Machine Voltage: 6 HP Robin Subaru, Manual Start 

● Machine Weight: 287 Lbs. 

● Shipping Weight: 326 Lbs. 

● Exhaust Stack Size: 8" 

● Machine Dimensions: Length=48", Width=27", Height=42.5" 

921SS SPECIFICATIONS 

● Pump Volume At Pump Head: 3.0 GPM/180 GPH 








● Machine Dimensions: Length=47", Width=31", Height=49" 

871SS SPECIFICATIONS 

● Pump Volume At Pump Head: 2.71 GPM/162.6 GPH 








● Machine Dimensions: Length=48", Width=27", Height=42.5"

TRIGGER 

GUN 

WAND 

HIGH PRESSURE 

HOSE 

BURNER EXHAUST 

VENT 

BURNER 

ENGINE FUEL 

TANK 

COIL DRAIN 

PLUG 

Figure 1 - Machine Component Layout (871SS Shown) 

ENGINE 

BURNER SWITCH 

HIGH PRESSURE 

NOZZLES 

THERMOSTAT 

HOUR 

METER 

CONTROL 

BOX 

ANTI-SIPHON 

VALVE 

Page 4 Hotsy 781SS, 871SS, 921SS 97-6642 Rev. 10/04 

PUMP 

BURNER FUEL 

TANK 

DETERGENT 

INJECTOR 

DETERGENT 

INLET LINE

INTRODUCTION 

Thank you for purchasing a Hotsy Pressure Washer. 

This manual covers the operation and maintenance of 

the 781SS, 871SS and 921SS washers. All information 

in this manual is based on the latest product information 

available at the time of printing. 

Hotsy, Inc. reserves the right to make changes at any 

time without incurring any obligation. 

Owner/User Responsibility: 

The owner and/or user must have an understanding of 

the manufacturer’s operating instructions and warnings 

before using this Hotsy pressure washer. Warning information 

should be emphasized and understood. If the 

operator is not fluent in English, the manufacturer’s instructions 

and warnings shall be read to and discussed 

with the operator in the operator’s native language by 

the purchaser/owner, making sure that the operator 

comprehends its contents. 

Owner and/or user must study and maintain for future 

reference the manufacturers’ instructions. 

This manual should be considered a permanent 

part of the machine and should remain with it if 

machine is resold. 

When ordering parts, please specify model and 

serial number. 

ASSEMBLY 

Unpacking 

Unpack carefully. Wear safety glasses or goggles while 

unpacking, assembling, or operating pressure washer. If 

there are missing components or hidden damage, 

immediately contact carrier concerning discrepancies. 

1. Cut strapping band from pressure washer and pallet. 

2. Remove pressure washer from pallet. 

Parts Included 

• Pressure Washer 

Pressure Hose 

Wand 

Operating Instructions and Parts Manual 

Gasoline Engine Manual 

Parts Bag Containing: 

■ Pressure Nozzles (3 Ea.) 

■ Quick Disconnects (2 Ea.) 

■ Quick Disconnect Plug 

■ Trigger Gun 

Tools Required 

8" Adjustable Wrench 

Teflon Tape 

Flat Blade Screwdriver 

Hotsy 781SS, 871SS, 921SS 97-6642 Rev. 10/04 

Pressure Hose, Trigger Gun and Wand 

1. When assembling, use teflon tape on all threaded 

plumbing connections to prevent leakage. 

2. Install the pressure hose on the pressure washer as 

shown in Figure 2. 

Figure 2 - Pressure Hose Installation to Coil 

3. Assemble wand components as shown in Figure 3. 

NOTE: The pressure nozzle is not to be installed at 

QUICK 

DISCONNECT 

PRESSURE HOSE 

WAND 

QUICK DISCONNECT PLUG 

TRIGGER GUN 

PRESSURE HOSE 

RELIEF VALVE 

QUICK DISCONNECT 

Figure 3 - Pressure Hose Installation to Trigger Gun 

this time. 

4. Make sure all plumbing connections are tight. 

Page 5

IMPORTANT SAFETY 

INSTRUCTIONS 

WARNING: When using this machine basic precautions 

should always be followed, including the following: 

CAUTION: To reduce the risk of 

CAUTION 

injury, read operating instructions 

carefully before using. 

READ OPERATOR’S 

MANUAL THOROUGHLY 

PRIOR TO USE. 

1. Read the owner's manual thoroughly. 

Failure to follow instructions 

could cause malfunction 

and result in death, 

serious bodily injury and/or 

property damage. 

2. Know how to stop the machine and bleed pressures 

quickly. Be thoroughly familiar with the controls. 

3. Stay alert - watch what you are doing. 

4. All installations must comply with local codes. Contact 

your electrician, plumber, utility company or 

the selling distributor for specific details. 

WARNING: Flammable liquids 

WARNING 

can create fumes which can ignite 

causing property damage or 

severe injury. 

RISK OF EXPLOSION: 

DO NOT SPRAY 

FLAMMABLE LIQUIDS. 

WARNING 

KEEP WATER SPRAY 

AWAY FROM 

ELECTRICAL WIRING. 

5. Risk of explosion - do not 

spray flammable liquids or operate 

in an explosive location. 

Operate only where open 

flame or torch is permitted. 

WARNING: Do not place machine 

near flammable objects when 

the engine is hot. 

WARNING: Keep water spray 

away from electrical wiring or fatal 

electric shock may result. 

Read warning tag on electrical 

cord. 

WARNING: Spray gun kicks back. Hold with both 

hands. 

6. Grip cleaning wand securely with both hands before 

starting the cleaner. Failure to do this could 

result in injury from a whipping wand. 

WARNING: Risk of fire. Do not 

WARNING 

add fuel when the machine is operating. 

RISK OF EXPLOSION: 

USE CAUTION WHEN 

REFUELING. 

7. Allow engine to cool for 2 minutes 

before refueling. If any 

fuel is spilled, make sure area 

is dry before testing spark 

plug or starting the engine. 

(Fire and/or explosion may 

occur if this is not done.) 

Gasoline engines on mobile or portable equipment shall 

be refueled: 

a. Outdoors; 

b. With the engine on the equipment stopped; 

c. With no source of ignition within 10 feet of the 

dispensing point; 

d. With an allowance made for expansion of the 

fuel should the equipment be exposed to a higher 

ambient temperature. 

In an overfilling situation, additional precautions are 

necessary to ensure that the situation is handled in 

a safe manner. 

WARNING 

HIGH PRESSURE 

STREAM CAN PIERCE 

SKIN AND TISSUES. 

WARNING 

RISK OF 

ASPHYXIATION. 

USE THIS PRODUCT 

ONLY IN A WELL 

VENTILATED AREA. 

WARNING: Risk of injection or severe 

injury to persons - Keep 

clear of nozzle — Do not touch 

or direct discharge stream at persons. 

This machine is to be used 

only by trained operators. 

CAUTION: Hot discharge fluid. 

Do not touch or direct discharge 

stream at persons. 

8. High pressure developed by these machines can 

cause personal injury or equipment damage. Use 

caution when operating. Do not direct discharge 

stream at people, or severe injury and/or death may 

result. 

WARNING: High pressure can 

WARNING 

cause paint chips or other particles 

to become airborne and fly 

at high speeds. 

USE PROTECTIVE 

EYEWEAR WHEN 

OPERATING. 

9. Eye safety devices and foot 

protection must be worn when 

using this equipment. 

10. Never make adjustments on 

machine while in operation. 

WARNING: Use only in well ventilated 

areas. Failure to observe 

this warning could cause a loss 

of consciousness or death. 

11. Avoid installing in small areas 

or near exhaust fans. Exhaust 

contains poisonous carbon 

monoxide gas; exposure may 

cause loss of consciousness 

and may lead to death. It also 

contains chemicals known, in certain quantities, to 

cause cancer, birth defects or other reproductive 

harm. 

12. Do not operate with the spray gun in the off position 

for extensive periods of time as this may cause 

damage to the pump. 

13. The best insurance against an accident is precaution 

and knowledge of the machine. 

Page 6 Hotsy 781SS, 871SS, 921SS 97-6642 Rev. 10/04

14. Hotsy will not be liable for any changes made to 

our standard machines, or any components not purchased 

from Hotsy. 

15. Read engine safety instructions provided. 

16. Never run pump dry or leave trigger gun closed longer 

than 5 minutes. 

17. Inlet water must be from a cold, clean fresh city 

water supply. 

WARNING: Only use recom- 

WARNING 

mended fuel. Using other fuels 

may result in a serious explosion 

causing personal injury, property 

damage or loss of life. 

18. Use No. 1 or No. 2 heating oil 

(ASTM D306) only. NEVER 

use gasoline in your fuel oil 

tank. Gasoline is more combustible 

than fuel oil and could 

result in a serious explosion. NEVER use crankcase 

or waste oil in your burner assembly. Fuel unit 

malfunction could result from contamination. 

RISK OF FIRE OR 

EXPLOSION: USE 

VAPOR FUEL ONLY. 

19. Do not confuse gasoline and fuel oil tanks. Keep 

proper fuel in proper tank. 

20. Protect machine from freezing. 

21. Be certain all quick coupler fittings are secured before 

using pressure washer. 

22. Do not allow acids, caustic or abrasive fluids to 

pass through the pump. 

23. To reduce the risk of injury, close supervision is necessary 

when a product is used near children. Do not 

allow children to operate the pressure washer. This 

machine must be attended during operation. 

24. Do not operate this product when fatigued or under 

the influence of alcohol or drugs. Keep operating 

area clear of all persons. 

25. Protect high pressure hose from vehicle traffic and 

sharp objects. 

26. Before disconnecting high pressure hose from water 

outlet, turn burner off and pull the trigger on the spray 

gun allowing water to cool to below 100° F before 

stopping machine. Then open the trigger gun to relieve 

pressure. Failure to properly cool down or maintain 

the heating coil may result in a steam explosion. 

27. Do not overreach or stand on unstable support. Keep 

good footing and balance at all times. 

28. This machine must be attended during operation. 

INSTALLATION 

Getting Started 

IMPORTANT: Proper initial installation of equipment 

will assure more satisfactory performance, longer 

service life, and lower maintenance cost. 


IMPORTANT: The use of a backflow preventer on 

the water supply hose is recommended and may be 

required by local code. 

The pressure washer should be run on a level surface and 

in a protected area where it is not readily influenced by 

outside forces such as strong winds, freezing temperatures, 

rain, etc. The pressure washer should be located to assure 

easy access for filling of fluids, adjustments and 

maintenance. Normal precautions should be taken by the 

operator to prevent moisture from reaching the pressure 

washer. It is recommended that a partition be made between 

the wash area and the pressure washer to prevent direct 

spray from the wand from coming in contact with the 

pressure washer. Moisture reaching the equipment will 

reduce the pressure washer’s service life. All installations 

must comply with the local codes covering such installations. 

Venting 

DANGER: DO NOT run machine indoors or in an 

enclosed area, as exhaust fumes may be hazardous 

to your health. 

DANGER: DO NOT operate machine in areas where 

flammable vapors (gasoline, solvents, etc.) may be 

present, as this machine may ignite the vapors. 

CAUTION: All venting must be in accordance with 

applicable federal and state laws, and local ordinances. 

Consult local heating contractors. 

If the pressure washer is to be used in an enclosed area, a 

flue must be installed to vent burner and engine exhaust 

to the outside atmosphere. Be sure the flue is the same 

size as the burner exhaust vent on the pressure washer. 

See Figure 1 for location. Poor draft will cause the pressure 

washer to soot and not operate properly. When selecting 

the location for installation, beware of poorly ventilated 

locations or areas where exhaust fans may cause an 

insufficient supply of oxygen. Proper combustion can only 

be obtained when there is a sufficient supply of oxygen 

available for the amount of fuel being burned. If it is 

necessary to install the machine in a poorly ventilated 

area, outside fresh air may have to be piped to the burner 

and a fan installed to bring sufficient air into the machine. 

Locate the pressure washer so that the flue will be as 

straight as possible and protrude through the roof at a 

proper height and location to provide adequate draft. This 

oil fired pressure washer must have a draft regulator 

installed in the flue (available from most heating 

contractors). A draft regulator will permit proper upward 

flow of exhaust flue gases. 

In addition, the pressure washer should never be operated 

in an enclosed area where high ambient temperatures exist. 

High ambient temperatures (above 100o F) can cause engine 

oil failure and will greatly reduce the engine’s performance. 

Gasoline Engine 

The gasoline engine is preset for operation at altitudes 

below 3000 feet above sea level. If operated at higher 

altitudes, it may be necessary to install a high altitude 

main jet in the carburetor. Contact an authorized engine 

sales and service center for details. 

Page 7

Pre-Operation Check 

❑ Pump Oil (SAE 30W non-detergent oil) 

❑ Cold Water Supply (3.5 gpm • 5/8" • 20 psi) 

❑ Hose, wand, nozzles (nozzle size per serial plate) 

❑ Water filter (intact, nonrestrictive) 

❑ Engine fuel (unleaded 86 or higher) 

❑ Engine oil (SAE 10W40) 

❑ Burner fuel (No. 1 or No.2 home heating fuel or diesel) 

Oil Burner 

Burner Air Adjustment: The oil burner on this machine 

is preset for operation at altitudes below 3000 feet. If 

operated at higher altitudes, it may be necessary to 

adjust the air shutter and air band setting. Adjust the air 

shutter for a #1 or #2 smoke spot on the Bacharach 

scale. 

To adjust, start machine and turn burner ON (refer to 

Operation for details). Loosen two locking screws found 

in the air shutter openings (refer to Figure 4) and close 

air shutter until black smoke appears from burner 

exhaust vent. Note air shutter position. Next, slowly 

open the air shutter until white smoke just starts to 

appear. Turn air shutter halfway back to the black smoke 

position previously noted. Tighten locking screws. 

AIR SHUTTER LOCKING SCREW 

AIR SHUTTER 

2 

4 

6 

8 

10 

AIR SHUTTER 

LOCKING SCREW 

AIR BAND 

Figure 4 - Burner Adjustment 

AIR BAND 

LOCKING SCREW 

If the desired position cannot be obtained using only 

the air shutter, lock the air shutter in as close a position 

as can be obtained, then repeat the above procedure 

on the air band setting. 

CAUTION: If white smoke appears from burner 

exhaust vent during start-up or operation, discontinue 

use and readjust air bands. 

NOTE: If a flue is installed, have a professional serviceman 

adjust your burner for a #1 or #2 smoke 

spot on the Bacharach scale. 

OPERATION 

Before Starting 

1. Read all manuals provided with this pressure washer. 

Become familiar with location and function of all 

operating and safety controls. 

WARNING: Check hoses, fittings, wand, trigger gun 

and fuel connections daily for signs of wear, cracks 

and looseness, and replace as required. 

2. Connect water supply hose to the garden hose connector 

located on pump. The water faucet and supply 

hose must be capable of providing a minimum of 3.5 

gallons per minute (GPM). 

3. Fill oil burner fuel tank. Use kerosene, #1 grade home 

heating oil, #1 or #2 diesel fuel. DO NOT USE GASO- 

LINE, CRANKCASE OIL DRAININGS, OR WASTE 

OIL. 

WARNING: DO NOT fill engine fuel tank while engine 

is running or hot. Let engine cool before refueling 

or spontaneous fire may result. Fuel spillage or vapors 

could ignite if engine is hot. 

4. Fill the engine fuel tank. Do not overfill, fill to the 

bottom of filler neck only. Use lead free gasoline 

minimum 86 octane. DO NOT use gasoline containing 

more than 15% MTBE, 5% methanol or 10% 

ethanol. Refer to the provided gasoline engine 

manual for additional details. 

5. Check pump and engine oil levels. 

6. If detergents are to be used, only use detergents 

intended for pressure washers. Follow instructions on 

the detergent container. 

IMPORTANT: Before installing pressure nozzle on 

initial start-up, turn on the water supply and allow 

water to run from the end of the wand until clear to 

prevent the pressure nozzle from clogging. 

IMPORTANT: If the pressure washer has not been 

used for an extended period of time, remove the pressure 

nozzle from the end of the wand and turn on 

water supply. Allow water to run from the end of the 

wand until clear. 

7. Install the proper pressure nozzle for your cleaning 

needs on the end of wand, refer to Figure 5. 

MANUAL TRIGGER LOCK 

PRESSURE 

NOZZLE 

Figure 5 - Nozzle Installation/Manual Trigger Lock 


IMPORTANT: The trigger gun provided with this pressure 

washer is equipped with a manual trigger lock 

to prevent accidental operation of the trigger gun. 

(Refer to Figure 5.) The manual trigger lock should be 

used whenever the trigger gun is not in use. 

To Start 

DANGER: DO NOT point wand or trigger gun at yourself 

or at any person. Bodily injury may result from 

water under high pressure. 

WARNING: Wear eye, ear, hand, foot and skin protection 

at all times while operating pressure washer. 

IMPORTANT: The water must be turned on before 

starting. Running the pump dry will cause damage 

and void warranty. 

IMPORTANT: DO NOT allow the machine to run with 

trigger of the trigger gun released for more than 

10 minutes at any one time or damage to pump may 

occur. 

1. Turn ON water supply. 

2. Hold wand firmly, release trigger of trigger gun. 

3. Place engine ON/OFF switch in the ON position. 

4. Open fuel shutoff valve (if so equipped). Move choke 

lever to FULL CHOKE position, (choke may not be 

needed on warm engine). Move throttle lever to HALF 

THROTTLE position. 

5. Pull the rope starter slowly until resistance is felt, then 

pull briskly. Do not allow the rope starter to snap back 

against the engine. Return it gently to prevent damage 

to the starter. 

6. When the engine starts, move choke lever until 

engine runs smoothly. When engine warms, move 

choke lever to NO CHOKE position. Move throttle 

lever to FULL THROTTLE position. 

IMPORTANT: To allow for proper burner operation, the 

throttle control must be kept in the full throttle position 

during operation. 

NOTE: If engine fails to start, refer to Troubleshooting 

Guide in this manual. 

7. Squeeze trigger of trigger gun and allow air to purge 

from system. 

8. If HOT water is desired, adjust the thermostat to the 

proper temperature and turn burner switch ON. The 

burner will light immediately with a small puff of 

smoke. You may need to initially adjust your burner 

for peak performance. See Oil Burner section under 

Installation. If smoke continues, contact Customer 

Service at 1-303-792-5200. When the trigger of the 

trigger gun is released or when the thermostat temperature 

setting is reached, the burner will automatically 

turn off. 

To Clean 

DANGER: DO NOT place hands or fingers in front of 

high pressure spray. Bodily injury may result. 


The detergent injector valve operates by reducing the 

volume of water, thus a vacuum is achieved and 

detergent is drawn into the system. DO NOT reduce the 

water inlet flow so the pump cavitates due to water 

starvation. Operating a pump with insufficient water will 

damage the pump seals. 

1. Insert detergent inlet line into container of mixed 

detergent. 

2. Completely open detergent control knob located on 

the side of the detergent injector valve. Refer to 

WATER ADJUSTMENT KNOB 

WATER 

INCREASE 

DETERGENT 

OFF 

Figure 6 - Detergent Injector Valve 

WATER 

DECREASE 

DETERGENT 

ON 

DETERGENT CONTROL KNOB 

Figure 6. 

3. Start the detergent suction by rotating the water 

adjustment knob of the detergent injector valve. 

Refer to Figure 6. Turning the knob counterclockwise 

will pull detergent into the system. The flow 

may be observed through the clear detergent line. 

Secure the knob position with the knurled nut. 

4. The side detergent control knob can now be adjusted 

to meter the desired amount of detergent. 

5. Wash from the bottom to the top, using side to side 

motions. This washes away heavy dirt and allows 

the detergent to soak as you work toward the top. 

6. Do not wash at a 90 o angle to the work (straight at 

it). This will allow water to splash back at you and 

reduces your cleaning power. Wash at a 30° to 60° 

angle to the work. This will allow the water to splash 

away from you and the water will wash the dirt away 

faster and easier. 

7. Use the width of the spray pattern to wash in a wide 

path. Overlap spray paths for complete coverage 

washing from side to side, using slow, steady 

motions. 

8. The nozzle should be 12" to 24" from work, closer 

for tough areas. Be careful on painted or delicate 

surfaces, the pressure may damage surface if nozzle 

is too close. 

9. Small parts should be washed in a basket so the 

Page 9

pressure does not push them away. Larger, lightweight 

parts should be clamped down so the pressure 

does not push them away. 

10. Turn the side detergent control knob clockwise (CW) 

for detergent decrease. Wait for detergent to clear. 

Always rinse with cold water after using detergent. 

Rinse from the top to the bottom to prevent detergent 

from dripping onto a rinsed area. For the best results, 

contact your Hotsy dealer to help you select the best 

detergent for your application. 

To Stop 

1. If detergents were used, draw clear water through the 

detergent inlet line to purge detergent. Failure to do 

so may clog detergent injector valve. 

2. If burner was used, turn OFF burner switch and 

allow pump to run cold water through coil for several 

minutes. 

3. Move throttle lever to idle position. 

4. Turn engine ON/OFF switch to the OFF position. 

5. Close fuel shutoff valve (if so equipped). 

6. Turn water supply OFF. 

7. Squeeze trigger of trigger gun to relieve system 

pressure. 

STORAGE 

DANGER: DO NOT store flammable liquids (gasoline, 

diesel fuel, solvents, etc.) near pressure washer, 

or in non-ventilated areas. 

Protect from freezing by storing in a heated area, or by 

flushing the system with antifreeze (use an automotive 

engine antifreeze or windshield washer solvent to 

antifreeze). To flush the system with antifreeze, the 

following steps are to be followed: 

1. Connect the water supply hose to the garden 

hose connector located on the pump. Turn on water 

supply. 

2. Place the detergent inlet line into a container of 

antifreeze. 

3. Hold wand firmly, release trigger of trigger gun. 

4. Start engine. Place throttle lever in Full Throttle 

position. 

5. Squeeze trigger of trigger gun and allow water to 

flow from the end of the wand. Watch for antifreeze to 

be drawn through the detergent inlet line. Allow the 

antifreeze to be drawn into the system for 5 to 10 

seconds. 

6. Release the trigger of the trigger gun and stop 

engine. 

7. Turn off water supply and disconnect water supply 

hose from the pump. 

8. Attach a short length of hose (approximately 3 feet 

long) to the garden hose connector located on the 

pump. Install a funnel in the other end of the hose 

Figure 7 - Winterizing 

FUNNEL 

GARDEN 

HOSE 

CONNECTOR 

as shown in Figure 7. 

9. Hold wand firmly, release the trigger of the trigger 

gun. 

10. Start engine. Place throttle lever in the idle position. 

11. Squeeze trigger on trigger gun. 

12. Slowly pour antifreeze into the funnel. Continue to 

add antifreeze until antifreeze flows from the end of 

the wand. 

13. Squeeze and release the trigger of the trigger gun 

several times to antifreeze the unloader system. 

14. Release the trigger of the trigger gun. Stop engine. 

15. Squeeze the trigger of the trigger gun to relieve system 

pressure. 

For added protection, after antifreezing, disconnect the 

pressure hose from the machine and remove the coil 

drain plug (refer to Figure 1 for location.) After coil has 

drained, replace pressure hose and coil drain plug. If 

the pressure washer is not to be used for an extended 

length of time, it is recommended that the system be 

flushed with antifreeze for rust protection. Refer to the 

Gasoline Engine Manual for engine storage 

information. 


MAINTENANCE 

WARNING: Unauthorized machine modification or 

use of non-approved replacement parts may cause 

personal injury and/or property damage and will 

void the manufacturer warranty. 

Pump 

Lubrication: To lubricate pump, use 30W non-detergent 

oil for pump crankcase. Crankcase must be filled to 

center of red dot on oil gauge found on the side of the 

pump, refer to Figure 8. During the break-in-period, make 

sure the oil is changed after the first 40 hours of 

operation. After that, replace oil every 3 months or 500 

hours of operation, whichever comes first. 

OIL FILL/DIPSTICK 

OIL DRAIN 

PLUG OIL GAUGE 

Figure 8 - Pump Lubrication 

Proper Pump Care: 

DO NOT pump acids. 

DO NOT allow pump to run dry. 

Winterize if storing in freezing temperatures, refer 

to Storage for details. 

Use a water softener on the water system if known 

to be high in mineral content. 

Use only high quality detergents and follow manufacturer's 

mix recommendations. 

Flush the system with clear water immediately 

after using detergent solutions. 

Clean filter screen on detergent inlet line 

periodically. 

Flush the pressure washer system with antifreeze 

if storing for an extended period of time, refer to 

Storage for details. 


Gasoline Engine 

Refer to the provided Gasoline Engine Manual for 

recommended maintenance. 

Relief Valve 

WARNING: The relief valve on this pressure washer 

has been factory set and sealed and is a field nonadjustable 

part. Tampering with the factory setting 

may cause personal injury and/or property damage, 

and will void the manufacturer warranty. For replacement 

parts refer to Figure 18. 

Unloader Valve 

WARNING: The unloader valve on this pressure 

washer has been factory set and sealed and is a field 

nonadjustable part. Tampering with the factory setting 

may cause personal injury and/or property damage, 

and will void the manufacturer warranty. For 

replacement refer to Figures 12-14. 

Burner Fuel Filter 

Drain any water which has accumulated in fuel filter 

and clean or replace filter element as needed. Refer to 

Figure 10. 

Heating Coil 

Coil Descaling: In hard water areas, scale buildup within 

the heating coil will occur. Scale deposits will decrease 

the water temperature rise and may eventually clog the 

heating coil. Contact your local service center when 

descaling is needed. 

Coil Desooting: Poor grades of fuel oil or inadequate 

combustion air will cause heavy soot buildup on the 

outside surface of the heating coil. These deposits will 

insulate the coil. This will restrict the air flow through the 

coil, further aggravating the soot buildup. Contact your 

local service center when desooting is needed. 

Hour Meter 

This hour meter will monitor the total hours of operation 

of the pressure washer to signal when routine 

maintenance is required. 

Page 11

TROUBLESHOOTING GUIDE 

SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION 

Gas engine will not run. Out of gas. Replenish supply. Use only recommended 

fuels. Refer to Before Starting 

under Operation. 

uel valve closed (if so equipped). Open valve. 

Pressure washer runs 

but won't spray. 

Low spray pressure at 

pressure nozzle. 

Loose spark plug wire. Reconnect. 

Choke or throttle set incorrectly. Refer to To Start under Operation. 

Engine ON/O switch in O 

position. 

Place engine ON/O switch in ON 

position. 

Low engine oil level. Replenish supply. Engine will not start 

or run if oil is low (on engines equipped 

with low oil protection). 

Refer to provided gasoline engine manual for additional troubleshooting. 

Trigger of trigger gun released. Squeeze trigger. 

Water supply not turned on. Open water supply valve. 

Clogged pressure nozzle. Clean pressure nozzle opening. 

Inadequate water supply. ully open faucet. Check for kinked or 

damaged hose. Use 5/8 inch minimum 

hose. Check for debris clogging inlet 

screen. 

Partially clogged or damaged 


Air being drawn through detergent 

inlet line. 

Detergent injector valve not set 

correctly. 

Uneven spray pattern. Partially clogged or damaged 


Pressure washer will 

not produce hot water. 

Clean or replace. 

Refill detergent container. Ensure that 

pick-up screen is fully immersed. 

Refer to To Clean for settings. 

Clean or replace. 

Burner switch in O position. Place switch in ON position. 

Inadequate fuel supply. Refill fuel tank. Use only recommended 

fuels. Refer to Before Starting 

under Operation. 

Inadequate water supply. ully open faucet. Check for kinked or 

damaged hose. Use 5/8 inch minimum 

hose. Check for debris clogging inlet 

screen. 

Trigger of trigger gun released. Squeeze trigger. Water must be spraying 

for burner to light. 


When ordering from your dealer, please provide the following: 

Model Number: 781SS, 871SS, 921SS 

Machine Serial Number: ________________________________ 

Component Part Number: ______________________________ 

Description: __________________________________________ 


TROUBLESHOOTING GUIDE 

SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION 

Pressure washer will not 

produce hot water. 

...continued 

Poor or no detergent 

flow. 

Thermostat set too low. Adjust thermostat to desired temperature. 

Blown fuse. Replace. use is located in Control 

Box. 

Engine is running too slow. Move throttle lever to full throttle 

position. 

Inadequate detergent supply. Refill detergent container. Ensure that 

pick-up screen is fully immersed. Open 

detergent valve. 

Detergent screen or hose clogged. Clean. Always start with a clean detergent 

container. 

Detergent injector valve not set 

correctly. 

Clogged detergent injector check 

valve. 

Poor cleaning. Improper detergent concentration or 

mixing. 

Refer to To Clean for settings. 

Clean check valve at detergent injector 

inlet. 

Mix detergent per manufacturer's 

instructions. Ensure that powdered 

detergents are fully dissolved. 

Wrong detergent for the application. Select appropriate detergent. 

Rinsing with hot water. A final rinse with cold water will reduce 

water spotting. 

IMPORTANT 

If the pressure washer demonstrates other symptoms or the corrective actions 

listed do not correct the problem, contact the local authorized Hotsy Service 

Center. The Hotsy Service Center can be identified by visiting www.hotsy.com 

or by calling 1-800-525-1976. 

Page 13

20 

21 

22 

FOR 

DETAIL SEE 

BURNER 

ILLUS. 

6 

5 

Figure 9 - Exploded View Left Side 

12 

14, 55 

25 

44 

19 

2 

18 

17 

RECTIFIER 

(REVERSED 

VIEW) 

26 


1 

27 

15 

6 

16 

53 

5 10 

23 

24 

FOR 

DETAIL 

SEE COIL 

OUTLET 

ILLUS. 

7 

5 

9 

6 

13 

FOR 

DETAIL SEE 

CONTROL 

BOX 

ILLUS. 

11 

8

51 


54 

50 

52 

31 

48 

49 

28 

32 

29 

47 

30 

4 

31 

6 

45 

32 

32 

31 

46 

31 

FOR 

DETAIL SEE 

PUMP ASSY 

ILLUS. 

42 

34 

33 

33 

35 

41 

32 

43 

39 

36,37 

38 

40 

3 

Page 15

Ref. No. Part No. Description Qty. 

1 318226 Chassis, Welded Assy 1 

375575 Chassis, Weldment (921SS) 1 

2 780460 Washer, 5/16" x 1-1/4", 

Fender, SAE 3 

3 952724 Tank, Fuel, 6-Gallon 1 

952733 Tank, Fuel, 8 Gal Hotsy (921SS) 1 

4 707116 Hose, 1/4", Fuel Line, Green (22") i 

5 703155 Nut, 5/16", SMAEC, NC 15 

6 780452 Washer, 5/16", Flat, SAE 12 

7 859815 Grommet, Rubber, Nozzle Holder 3 

8 646113 Label, Detergent Metering 1 

9 785096 Mount, Rubber Vibration, 40 Duro 2 

10 784446 Mount, Rubber, Vibration, 30 Duro 2 

11 834416 Label, Instructions 1 

12 860273 Regulator, Voltage, 15 Volt 1 

13 357054 TGB, RD 0.375 x .125W x 30 1 

14 735323 Screw, 10/32" x 3/4" BH SOC CS 4 

15 268006 Insulation, Cerfelt 16" x 50" 1 

16 226222 Coil, 16" 1 

17 698247 Nipple, 1/2" Hex, Steel 1 

18 375449 Coil, Tank SS, Weldment 1 

19 824115 Clip, Retaining, U-Type 4 

20 213044 Top Hat, Weld Assy, 

16" Hotsy Coil 1 

21 268004 Insulation, Cerfelt, 16 OD x 8.3 ID 1 

22 860102 Ring, Insulation Retainer, 

16" Top Hat 1 

23 829979 Label, Plate Aluminum 2 

24 10-07993 Label, Warnings 1 

25 859806 Grommet, 2-1/8" x 2-7/8" x 7/16" 

Rubber 1 

26 815329 Bushing, 1" Snap 1 

27 616000 Bushing, Snap, 5/8" 1 

28 698200 Nipple, 1/4" x 2" x 1/2", Brass 1 

29 615279 Bushing, 3/8" x 1/4", Galv. 1 

30 851080 Filter, Fuel Hotsy, 3/8" Female 1 

31 698020 Hose Barb, 1/4" Barb x 1/4" ML Pipe 3 

32 823988 Clamp, Hose, UNI .46-.54 ST 4 

33 867368 Hose, 1/4", Push-On, Fuel Line i 

34 780456 Washer, 5/8", Flat, SAE 8 

35 983013 Wheel & Tire, 6.5" 

Steel Rim, 12.5" Tire 4 


36 817322 Cap, 5/8" Axle Hub, Black 4 

37 848616 Nut, .61 ID, Push, Flat 4 

38 817312 Cap, w/Fuel Gauge 1 

39 661277 Standpipe 1 

40 2-0027 Elbow, 3/8" 1 

41 799490 Swivel, 1/4" JIC Fem, Push-On 1 

42 815230 Bushing, Rubber, Nitrile 2 

43 2-10491 Plug, 1/4"JIC 1 

44 213191 Insulation 1 

45 615433 Bolt, 5/16" - 24 x 3/4" NF HH 4 

46 860282 Reducer, M14 to 1/4" F 1 

47 646226 Label, Hot/Caliente 

w/Arrows Warning 1 

48 661278 Engine, 7 HP Robin (871SS) 1 

661280 Engine, 6HP Robin (781SS) 1 

5-0005 Engine, Robin 9HP (921SS) 1 

49 615939 Screw, 5/16" x 1-1/2" Whiz 4 

50 4-02037824 Hose, 3/8" x 24", 2 Wire, 

Pressure Loop 1 

51 801102 Nipple, 3/8" Hex, Steel 1 

52 715744 Plug, 3/8", Sq. Head, Galv. 1 

53 926598 Rivet, 1/8" x 1/4", POP, AL 8 

54 954812 Tee, 3/8" NPT, 2500 WP, Brass 1 

55 799484 Nut, 10/32" Keps 4 

▲ 444461 Label, Caution, Gasoline, White 1 

▲ 646026 Label, Warning, Carbon Monoxide 1 

▲ 834153 Label, Fuel Type 1 

▲ 834154 Label, Caution Winterize 1 

▲ 834159 Label, Use Hotsy Detergent 1 

▲ 646095 Label, Troubleshooting 1 

▲ 213191 Insulation Pancake, 18" 1 

▲ 753187 Key, 3/16" x 3/16" x 2" SST 1 

▲ 890874 Tag, Oil Burner 1 

▲ 735321 Screw, 4 mm x 6 mm, Pan Head 1 

▲ 11-3101 Tab, Gas Engine 1 

▲ 11-3100 Warning, Unloader 1 

▲ Not Shown 

❉ Order Amount Needed In Feet 


1-1/8" 

9 

Figure 10 - Burner Assembly 

8 

5/32" 

AIR CONE 

ELECTRODE SETTINGS 

1/4" 

5/32" 


1 616027 Burner 1 

2 698023 Nipple 3/8" x 1/4" Hose 1 

3 ✪ 851080 Fuel Filter 1 

4 615279 Reducer Bushing 3/8" x 1/4" 1 

5 698200 Pipe Nipple 1/4" x 2-1/2" 1 

6 661257 Street Elbow 1/4" 1 

7 698019 Nipple 1/8" x 1/4" Hose 1 


2 

3 

6 

4 

7 

5 

10 


8 900650 Nozzle, 1.50, 90° 1 

9 661413 Electrodes 1 

10 830492 Fuel Pump 1 

11 723369 Solenoid 1 

12 676894 Fuel Line 1 

▲ 783813 Motor 1 

▲ 630730 Coupling 1 

▲ 676640 Blower Fan 1 

■ Standard hardware item available locally. 

▲ Not Shown 

Replacement Parts 

1 

11 

12 

✪ 875490 Filter Element 1 

Page 17

14 

Figure 11 - Control Box Assembly 


1 95-0710983516 Box, Front 1 

2 11-0511 Label, Control Box 1 

3 785118 Hour Meter, 12-28 V DC 1 

4 875465 Switch, Rocker, 15A/12V 1 

5 835150 Knob, Thermostat 1 

6 735321 Screw, 4mm x 6mm, Pan Head 2 

7 915390 Plate, Thermostat Cover 1 

8 955930 Thermostat 1 

9 707147 Capacitor 1 

13 


10 612937 Bolt, 1/4" x 3/4" 4 

11 630649 Channel 2 

12 703127 Locknut, 1/2" 3 

13 615414 Box, Back 1 

14 703185 Nut, 1/4" 4 

15 6-051561 Strain Relief 3 

▲ 676638 Fuse, ATC 30 Amp 1 

▲ 707146 Holder, Fuse 1 

▲ 829620 Plug 1 

16 358026 Clamp 1 

17 612945 Bolt, 1/4-20 x 1/2" 1 

18 703106 Nut, 1/4" 1 

19 2-011681 Cap, Capacitor, 1.37 x 1.50 x 

.060 BLK, W/o Hole 1 

20 860140 Relay 1 

▲ Not Shown 


12 

15 2 

11 

10 

20 

1 

8 

19 

9, 16, 17, 18 

3 

4 

7 

6 

5

Figure 12 - Pump Assembly (871SS Shown) 


1 830148 Pump, Hawk, HHS335BR, Bulk Pkg 1 

2 921464 Unloader, HM SS Unset 1 

3 898141 Nipple, 3/8" x 2"L, Brass 1 

4 961534 Hose, 1/4" x 1/2", Braided 

Vinyl 4 ft. 

5 935159 Strainer, Chemical, 

with 1/4" Brass Barb 1 

6 823989 Clamp, Hose, UNI .40-.48 ST 1 


1 

2 

11 

14 

10 

3 

9 

4 

8 

7 


7 801126 Swivel, 3/8" MP x 3/4" GHF 

w/Strainer 1 

8 873596 Injector, Adjustable, Inlet 1 

9 661356 Elbow, 1/2" JIC x 3/8" Fem, 90° 1 

10 829663 Plug, 3/8" Gas Tap 1 

11 875651 Switch, Pressure, Black 1 

12 ▲ 921421 Pump Protector 1 

13 921395 Valve, Anti-Siphon 1 

14 799515 Nipple, 1/2" JIC x 3/8" Pipe 1 

15 ▲ 875575 Spring, .95 x .055 x .6 1 

▲ Not Shown 

6 

5 

13 

Page 19

15 

12 

11 

Figure 13 - Pump, Exploded View (781SS Shown) 

10 

3 4 

Ref. No. Part No. Description Qty/Pump 

1 830160 Pump, Comet, 2527G 1 

2 661356 Elbow, 1/2" JIC x 3/8", 90° 1 

3 801126 Swivel, GHF 1 

4 661361 Elbow, 3/8", 45° Street 1 

5 873596 Injector Adjustable 1 

6 600071 Nipple, 3/8" Hex 1 

7 875651 Switch, Pressure 1 

8 722787 Elbow, 1/8" MNPT x 1/4" FNPT 1 

9 921421 Pump Protector 1 

10 823988 Clamp, Hose, UNI .46 - .54 1 

11 961534 Hose, 1/4" x 1/2" Braided 4 ft. 

12 935159 Strainer 1 

13 715736 Plug, 1/8 Sq. 1 

14 600260 Adapter 3/8 NPT x 1/4 NPT 1 

15 921395 Valve, Anti-Siphon 1 

5 

2 

9 

7 

14 


6 

13 

8 

1

3 

Figure 14 - Pump, Exploded View (921SS Shown) 

1 


1 5-1260 Pump, Hotsy HS3040 1 

2 5-3029 Unloader, PA 8GPM@3650 PSI, VB55 

EZ/47 Series 1 

3 921422 Pump, Protector, 1/2" PTP 1 

4 722774 Nipple, 1/2" x 3/8", Pipe 1 

5 873596 Injector, Adjustable, Inlet 1 

6 961534 Hose, 1/4" x 1/2" Braided 

Vinyl 4 ft. 

7 935159 Strainer, Chemical w/1/4" Brass 

Barb 1 

8 823989 Clamp, Hose, UNI .40-.48ST 1 


15 

14 

2 

13 

6 

4 

12 

5 

9 

8 


9 661361 Elbow, 3/8" Steel, Street, 45° 2-00575 1 

10 801126 Swivel, 3/8" MP x 3/4" GHF 

w/Strainer 2-10943 1 

11 921395 Valve, Anti-Siphon, Watts 8BI 2-30062 1 

12 661357 Elbow, 1/2" JIC, 3/8", 90° 2-0053 1 

13 830584 Plug, 1/8" Countersunk 2-1044 1 

14 644802 Elbow, 3/8" Street 2-0031 1 

15 875651 Switch, Pressure 6-02165 

1 

7 

10 

11 

Page 21



1 89-3202001800 Cap 1/8"" 1 

2 89-3609015600 Screw M8 x 55 4 

3 89-1220004500 Valve Kit 6 

4 89-1210004900 O-Ring 1.78 x 12.42 6 

5 89-3009012900 Valve Seat 6 

6 89-3604002800 Suc./Del. Valve 6 

7 89-1802019200 Spring 6 

8 89-1205003300 Valve Cage 6 

9 89-0601027300 Spacer 2 

10 89-1210015100 O-Ring 1.78 x 17.17 6 

11 89-3202023600 Plug 6 

12 89-1215027100 Reg. Val Kit for AX 270 PSI 1 

13 89-1817005300 Knob 1 

14 89-3622003000 Stop Adjustable Nut M4 x 4 1 

15 89-1227002200 Nut 1 

16 89-1802018200 Spring 1 

17 89-0204004600 Adjustable Knob 1 

18 89-0009020700 Seat 1 

19 89-2409007700 Piston Rod 1 

20 89-1210040600 O-Ring 1 

21 89-0009020600 Ring 1 


22 89-0204004500 Housing 1 

23 89-1210040700 O-Ring 1 

24 89-1210040500 O-Ring 1 

25 89-0009020500 Ring 1 

26 89-1210040400 O-Ring 1 

27 89-0009020400 Ring 1 

28 89-3002050800 Housing with Ball 1 

29 89-3009012200 Seat 1 

30 89-1210040300 O-Ring 1 

31 89-3009001300 Valve Seat 1 

32 89-1210035600 O-Ring 1.78 x 25.12 3 

33 89-1241005000 Piston Seal Ø14 3 

34 89-0019010300 Sealing Ring 3 

35 89-3201001800 Oil Level Plug 1 

36 89-1802015300 Spring 3 

37 89-2409008900 Piston 3 

38 89-0009022100 Ring 3 

39 89-0009022000 Ring Ø14 3 

41 89-3200007100 Plug G3/8 1 

42 89-3002052200 Support 1 

43 89-0019003400 Sealing Ring 40 x 55 x 7 1 


781SS Pump Exploded View Parts List Continued 


44 89-1210042900 O-Ring 1 

45 89-0001039500 Eccentric Shaft 3/4"" 1 

46 89-0438007600 Ball Bearing 40 x 80 x 18mm 1 

47 89-0001041700 Eccentric Shaft 8"" 1 

48 89-0436001600 Axial Bearing 1 

49 89-2816002500 Thrust Bearing 1 

50 89-3609000500 Screw M8 x 20 1 

51 89-0403013500 Pump Crankcase 1 

52 89-3609000500 Screw M8 x 20 4 

53 89-3410029800 Injector Body 3/8 NPT 1 

54 89-1210004900 O-Ring 1.78 x 12.42 1 

55 89-1210004000 O-Ring 1.78 x 15.6 1 

56 89-3410030300 Injector Body Kit 3/8 NPT 1 

57 89-1802019700 Spring 1 

58 89-2409008600 Check Valve 1 



59 89-1210039700 O-Ring 1 

60 89-2409009100 Check Valve Kit 1 

61 89-0009021900 Ring 3 

62 89-0009023000 Ring 3 

63 89-1241005600 Piston Seal 2700 PSI 3 

64 89-3200001700 Plug 1/8 x 8 1 

65 89-3200000700 Plug 3/8 Gas OT58 1 

66 89-2803043500 Injector Kit 1 

67 89-2803042500 Hose Barb Fitting 1 

68 89-2812006700 O-Ring 1 

69 89-3003002600 Ball 1 

70 89-1802018000 Spring 1 

71 89-3218029900 Pump Valve Chamber 1 

72 89-3200001700 Plug 1/8 x 8 1 

77 89-2800008100 Garden Hose Swivel 1 

Page 23

4 



1 878197 Allen Screw 6 

2 735313 Crankcase Cover Allen Screw 5 

3 858431 Sight Glass, 3/8" 1 

4 827324 Crankcase Cover 1 

5 855889 Crankcase Cover Gasket 1 

6 630685 Crankshaft 1 

7 617639 Ball, Bearing 1 

8 630684 Crankshaft Seal 1 

9 600127 Mounting Range 1 

2 

1 

5 


3 


10 780561 Washer 4 

11 876152 Mounting Flange Screw 4 

Replacement Parts 

753701 Seal Packing Kit (15mm) 1 

753037 Complete Seal Packing Kit (15mm) 3 

753039 Complete Valve Assembly Kit 6 

877655 Plunger Seal Kit 1 

753040 Ceramic Sleeve Kit (15mm) 3

Figure 17- Pump, Exploded View (HS3040G, HS3540G, HS4040G, HS5030G) 

ITEM PART NO. DESCRIPTION QTY ITEM PART NO. DESCRIPTION QTY ITEM PART NO. DESCRIPTION QTY 

1 70-020225 Crankcase 1 

2 70-060201 Plunger Guide 3 

3* 70-000103 Plunger Oil Seal 3 

4* 70-060107 O-Ring Ø1.78 x 31.47 3 

5* 70-000220 "V" Seal , 15mm 6 

6* 70-120120 Pressure Ring, 15mm 3 

7* 70-030027 Support Ring 15mm 6 

8* 70-030020 Intermed. Ring 15mm 3 

9 70-160120 Brass Plug, 1/2" 1 

10 70-060307 Copper Washer 1/2" 1 

11 70-160216 Manifold Housing 1 

12* 70-060119 O-Ring Ø2.62 x 17.13 6 

13* 70-360470 Valve Assembly 6 

14* 70-060165 O-Ring Ø2.62 x 20.29 6 

15 70-160130 Valve Plug 6 

16 70-180103 Manifold Stud Bolt 8 

17 70-140001 Washer 8 

18 70-060306 Copper Washer 3/8" 1 

19 70-160117 Brass Plug 3/8" 2 

20** 70-150318 Valve Seat 6 

21** 70-120200 Valve Plate 6 


22** 70-090030 Valve Spring 6 

23** 70-060405 Valve Cage 6 

24 70-180112 Hexagonal Screw 9 

25 70-140002 Washer 4 

26 70-050056 Closed Bearing Housing 1 

27 70-060163 O-Ring Ø 1.78 x 60.05 2 

28 70-150003 Snap Ring 1 

29 70-021310 Double Row Ball Bearing1 

30 70-000491 Crankshaft (3040G) 1 

70-000492 Crankshaft (3540G) 1 

70-000493 Crankshaft (4040G) 1 

70-000494 Crankshaft (5030G) 

31 70-180302 Set Screw 1 

32 70-160006 Oil Dip Stick 1 

33 70-020010 Needle Roller Bearing 1 

34 70-050055 Engine Flange 1 

35 70-140304 Spring Washer 4 

36 70-180128 Flange Screw 4 

37 70-180220 Engine Screw, 5/16" 4 

38 70-140051 Washer 4 


REPAIRKITNUMBER70-260824 70-260825 70-260823 70-260007 70-260027 

KIT 

DESCRIPTION 

ITEMNUMBERS INCLUDED 

NUMBE 

R OF 

CYLIN 

DERS 

KIT 

WILL 

SERVICE 

Plunger 

Seal 

15mm 

4, 

5, 

7 

Complete 

SealPacking15mmPlunger15mm Complete 

Valve 

3, 

4, 

5, 

6, 

7, 

8 

44, 

45, 

46, 

47, 

48 

TORQUE 

SPECS 

Item # Ft. 

-lbs 

1575 1630 2418 349 4513 5111 40 70-180221 Engine Screw 3/8" 4 

41 70-140052 Washer 4 


43 70-000109 Crankshaft Seal 1 

44* 70-030211 Plunger Nut 3 

45* 70-120025 Plunger, 15mm 3 

46* 70-140027 Copper Spacer 3 

47* 70-060130 O-Ring Ø1.78x5.28 3 

48* 70-000913 Teflon Ring 3 

49 70-000302 Plunger Rod 3 

50 70-150001 Snap Ring 6 

51 70-150201 Connecting Rod Pin 3 

52 70-010001 Connecting Rod 3 


54 70-180105 Connecting Rod Screw 6 

55 70-060009 Cover Gasket 1 

56 70-020350 Crankcase Cover 1 

57 70-060302 Gasket, G3/8 1 

58 70-070001 Sight Glass, G3/8 1 

* Part available in kit (See below) 

** Part available in kit ONLY (See below) 

Plunger 

Oil 

Seals 

12, 13, 

14 

3 

1 3 3 1 1 

Page 25

Figure 18 - Pump, Exploded View 


Figure 19 - Coil Outlet Assembly 


1 698247 Hex Nipple 1/2" x 2" 1 

2 875555 Relief Valve Seat 1 

3 799501 Elbow 1/4" x 3/8" Hose 1 

4 780565 Copper Washer 2 

5 915630 Plug 3/8" 2 


1 

9 

4,5 

6 

4,5 


6 783845 Relief Valve Manifold 1 

7 ■ Screw 4mm x 6 mm 1 

8 644802 Street Elbow 3/8" 1 

9 640100 Relief Valve Cartridge 1 

■ Standard hardware item available locally. 

2 

7 

8 

3 

Page 27

Figure 20 - Trigger Gun/Wand Assembly 


1 867207 Hose, 3/8" x 50', 1 Wire, 

Tuff-Skin 1 

2 860447 Gun, Shutoff 1 

3 915786 Nipple, 1/4" x 1/4" NPT ST Male 1 

4 826169 Coupler, 1/4" Female, Brass 2 

5 936647 Wand, SGL STR, Insulated, 48" 1 

6 799091 Nozzle, SACQMEG, 0003.5, 

Red 1 

799092 Nozzle, SACQMEG, 1503.5, 

Yellow 1 

799093 Nozzle, SACQMEG, 4003.5, 

White 1 

3 

1 

2 

4 

5 


4 

6

Figure 21 - Wiring Diagram (871SS Shown) 


Page 29

97-6642 • Rev. 10/04 

WARRANTY 

HOTSY LIMITED WARRANTY: 

Hotsy products are warranted by the Hotsy Corporation (Hotsy) to be free of defects in material and 

workmanship under normal use, for a period of ONE YEAR from the date of the original purchase. 

Items that fail due to normal wear such as o-rings hoses, seals, quick couplers, nozzles, gunjets, etc. or 

damage resulting from neglect, abuse, tampering, or modification are not covered under this warranty. 

Hotsy will at its option repair or replace any part covered by this warranty which is defective under 

normal use for one year at no charge for parts or labor. All defects must be verified by an authorized 

Hotsy service location. This warranty is not transferable. 

EXCEPTIONS TO THE ONE YEAR WARRANTY FOR PARTS ONLY ARE: 

Hotsy Pumps: SEVEN YEAR Warranty (LIFETIME Brass Manifold Warranty- 

Even Against Freezing) 

General Pumps: FIVE YEAR Warranty 

Heating Coils: FOUR YEAR Warranty 

LIMITATION OF LIABILITY: 

To the extent allowable under applicable law, Hotsy liability for consequential and incidental damages 

is expressly disclaimed. Hotsy liability in all events is limited to, and shall not exceed, the purchase 

price paid for the equipment. Hotsy liability is limited to repair or replacement of defective parts only, at 

the option of the Hotsy Corporation. 

WARRANTY DISCLAIMER: 

Hotsy has made a diligent effort to illustrate and describe the product in this literature accurately; 

however, such illustrations and descriptions are for the sole purpose of identification, and do not 

express or imply a warranty that the product is merchantable or fits a particular purpose, or that the 

product will necessarily conform to the illustrations or descriptions. 

PRODUCT SUITABILITY: 

Many states and localities have codes and regulations governing sales, construction, installation, and/ 

or use of products for certain purposes, which may vary from those in neighboring areas. While 

attempts to assure that its products comply with such codes, it cannot guarantee compliance and 

cannot be responsible for how the product is installed or used. Before purchase and use of a product, 

please review the product application, and national and local codes and regulations, and be sure that 

the product, installation, and use will comply with them. 

PROMPT DISPOSITION: 

Hotsy will make a good faith effort for prompt correction or other adjustments with respect to any 

product which proves to be defective within limited warranty. For any product believed to be defective 

within limited warranty, contact dealer from whom product was purchased. Dealer will give additional 

directions. If unable to resolve satisfactorily, write to Hotsy at address below, giving dealer's name, 

address, date of purchase, model, serial number, and describing the nature of the defect. If product 

was damaged in transit to you, file claim with freight carrier. 

The Hotsy Corporation 

www.hotsy.com 

1-800-525-1976

781SS-871SS 97-6642 0410 - ETS Company Pressure Washers ...

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