Hotsy 771 Service manual

SERIAL NUMBER:
DATE PURCHASED:
FOR SALES AND SERVICE, PLEASE CONTACT:
OPERATING INSTRUCTIONS
AND PARTS MANUAL
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!
SPECIFICATIONS
● Pump Volume At Pump Head: 3.0 GPM/180 GPH
● Pump Pressure At Pump Head: 1500 PSI
● Burner Type: (771) LP Gas Fired, 376,000 BTU/Hr.;
(772) Natural Gas Fired, 378,000 BTU/Hr.
● Machine Voltage: 230VAC/60Hz/1Ph
● Total Machine Amperage: 13 Amps
● Machine Weight: 355 Lbs.
● Shipping Weight: 390 Lbs.
● Exhaust Stack Size: 10"
● Machine Dimensions: Length = 31.5", Width = 20", Height = 36.5"
MODEL 771/772
L
I
S
T
E
D
®
Conforms To UL Standard 1776
L
I
S
T
E
D
®
C
Certified to CAN/CSA - B140.11
8.941-246.0

3
CONTENTS
HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
Model Number ______________________________
Serial Number ______________________________
Date of Purchase ___________________________
The model and serial numbers will be found on a decal attached
to the pressure washer. You should record both serial number and
date of purchase and keep in a safe place for future reference.
Introduction & Safety Information 4-6
Component Identification 7
Assembly Instructions 8
Installation Instructions 9-12
Operating Instructions 13-14
Maintenance and Service 15
Troubleshooting 16-17
Warranty

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
OPERATOR’S MANUAL PRESSURE WASHER
4
INTRODUCTION & IMPORTANT SAFETY INFORMATION
Thank you for purchasing this Pressure Washer.
We reserve 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 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 com-
prehends its contents.
Owner and/or user must study and maintain for future
reference the manufacturers’ instructions.
The operator must know how to stop the machine
quickly and understand the operation of all controls.
Never permit anyone to operate the engine without
proper 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. Use only identical replacement
parts.
This machine is to be used only by trained
operators.
IMPORTANT SAFETY
INFORMATION
READ OPERATOR’S
MANUAL THOROUGHLY
PRIOR TO USE.
WARNING: To reduce the risk of
injury, read operating instruc-
tions carefully before using.
1. Read the owner's manual
thoroughly. Failure to follow
instructions could cause mal-
function of the machine and
result in death, serious bodily
injury and/or property dam-
age.
2. Know how to stop the machine and bleed pressure
quickly. Be thoroughly familiar with the controls.
3. Stay alert — watch what you are doing.
4. Do not replace LP tank while machine is running.
5. All installations must comply with local codes. Con-
tact your electrician, plumber, utility company or the
selling distributor for specific details. If your machine
is rated 250 volts or less, single phase will be pro-
vided with a ground fault circuit interrupter (GFCI).
If rated more than 250 volts, or more than single
phase this product should only be connected to a
power supply receptacle protected by a GFCI.
DANGER: Improper connection of the equip-
ment-grounding conductor can result in a risk of
electrocution. Check with a qualified electrician or
service personnel if you are in doubt as to whether
the outlet is properly grounded. Do not modify the
plug provided with the product - if it will not fit the
outlet, have a proper outlet installed by a qualified
electrician. Do not use any type of adaptor with
this product.
WARNING
KEEP WATER
SPRAY AWAY FROM
ELECTRICAL WIRING.
WARNING: Keep wand, hose, and
water spray away from electric
wiring or fatal electric shock may
result.
6. To protect the operator from
electrical shock, the machine
must be electrically grounded.
It is the responsibility of the
owner to connect this machine
to a UL grounded receptacle of proper voltage and
amperage ratings. Do not spray water on or near
electrical components. Do not touch machine with
wet hands or while standing in water. Always dis-
connect power before servicing.
RISK OF EXPLOSION:
IF GAS SMELL
PRESENT TURN OFF
SUPPLY
WARNING
WARNING: Flammable liquids
can create fumes which can ig-
nite, causing property damage
or severe injury.
WARNING: Risk of explosion
— Operate only where open
flame or torch is permitted.
RISK OF FIRE.
DO NOT ADD FUEL
WHEN OPERATING
MACHINE.
WARNING
WARNING: Risk of fire — Do not
change tanks when the product
is operating or still hot.
WARNING: Use vapor fuel only.
7. Oil burning appliances shall
be installed only in locations
where combustible dusts and
flammable gases or vapors
are not present. Do not store
or use gasoline near this ma-
chine.
8. Keep operating area clear of all persons.
WARNING
USE PROTECTIVE
EYE WEAR
AND CLOTHING
WHEN OPERATING
THIS EQUIPMENT.
WARNING: High pressure spray
can cause paint chips or other
particles to become airborne
and fly at high speeds. To avoid
personal injury, eye, hand and
foot safety devices must be
worn.
9. Eye, hand, and foot protection
must be worn when using this
equipment.

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
5
PRESSURE WASHER OPERATOR’S MANUAL
WARNING
PROTECT FROM
FREEZING
WARNING: Protect machine from
freezing.
13. To keep machine in best
operating conditions, it is
important you protect machine
from freezing. Failure to protect
machine from freezing
could cause malfunction of the
machine and result in death,
serious bodily injury, and/or property damage. Fol-
low storage instructions specified in this manual.
14. Inlet water must be clean fresh water and no hotter
then 90°F.
WARNING
RISK OF
ASPHYXIATION. USE
THIS PRODUCT ONLY
IN A WELL
VENTILATED AREA.
WARNING: Risk of asphyxiation.
Use this product only in a well
ventilated area.
15. Avoid installing machines in
small areas or near exhaust
fans. Adequate oxygen is
needed for combustion or
dangerous carbon monoxide
will result.
16. Manufacturer will not be liable for any changes
made to our standard machines or any components
not purchased from us.
17. The best insurance against an accident is precau-
tion and knowledge of the machine.
WARNING
RISK OF INJURY
FROM FALLS WHEN
USING LADDER.
WARNING: Be extremely careful
when using a ladder, scaffolding
or any other relatively unstable
location. The cleaning area
should have adequate slopes
and drainage to reduce the pos-
sibility of a fall due to slippery
surfaces.
18. Do not overreach or stand on unstable support.
Keep good footing and balance at all times.
19. Do not operate this machine when fatigued or under
the influence of alcohol, prescription medications,
or drugs.
20. Follow the maintenance instructions specified in
the manual.
21. Do not replace LP tank while machine is running.
Serious injury could result.
WARNING: Use vapor fuel only.
22. The LP models are designed to run on vapor pro-
pane fuel. Do not use liquid fuel. Have a qualified
serviceman install and service your equipment.
IMPORTANT SAFETY INFORMATION
WARNING
EAR PROTECTION
MUST BE WORN
WARNING: This machine exceeds
85 db appropriate ear protection
must be worn.
HOT DISCHARGE FLUID:
DO NOT TOUCH OR
DIRECT DISCHARGE
STREAM AT PERSONS.
CAUTION: Hot discharge fluid.
Do not touch or direct discharge
stream at persons.
WARNING: This machine pro-
duces hot water and must have
insulated components attached
to protect the operator.
WARNING
RISK OF INJURY.
HOT SURFACES
CAN CAUSE BURNS
WARNING: Risk of injury. Hot
surfaces can cause burns. Use
only designated gripping areas
of spray gun and wand. Do not
place hands or feet on non-insu-
lated areas of the pressure
washer.
10. To reduce the risk of injury, close supervision is
necessary when a machine is used near children.
Do not allow children to operate the pressure
washer. This machine must be attended during
operation.
TRIGGER GUN KICKS
BACK - HOLD WITH
BOTH HANDS
WARNING
WARNING: Grip cleaning wand
securely with both hands before
starting. Failure to do this could
result in injury from a whipping
wand.
11. Never make adjustments on
machine while in operation.
12. Be certain all quick coupler fit-
tings are secured before using
pressure washer.
RISK OF INJECTION
OR SEVERE INJURY
TO PERSONS. KEEP
CLEAR OF NOZZLE.
WARNING
WARNING: High pressure devel-
oped by these machines will
cause personal injury or equip-
ment damage. Keep clear of
nozzle. Use caution when oper-
ating. Do not direct discharge
stream at people, or severe in-
jury or death will result.

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
OPERATOR’S MANUAL PRESSURE WASHER
6
23. Never expose a spark or flame where there may
be unburned gas present.
24. Install the machine 18” above the floor and about
2 feet from wall providing adequate ventilation and
space.
25. When making repairs disconnect from electrical
source and shut off gas valve.
26. Install this machine on non combustible flooring.
27. Do not allow acids, caustic or abrasive fluids to pass
through the pump.
28. Never run pump dry or leave spray gun closed
longer than 1-2 minutes.
WARNING: If connection is made to portable water
supply, a back flow device must be provided.
Follow the maintenance instructions
specified in the manual.
IMPORTANT SAFETY INFORMATION
Example Of Down
Draft Diverter
For Gas Fired
Machines

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
7
PRESSURE WASHER OPERATOR’S MANUAL
COMPONENT IDENTIFICATION
WARNING
Honeywell
PV
MV
M
P
V
V
ON
OFF
PSI IN
OFF
F°
10-02033
200
165
130
95
235
270
300
TEMPERATURE
BURNER
RESET
PILOT LIGHT
PUMP
ON
OFF
MOTOR OVERLOAD
PUSH TO RESET
DEPOSITIVO DE REPOSICION
89412460-8
Pump — Delivers a specific gpm to the high pressure
nozzle which develops pressure.
Spray Gun — Controls the application of water and
detergent onto cleaning surface with trigger device.
Includes safety latch.
Wand — Must be connected to the spray gun.
High Pressure Hose — Connect one end to water
pump high pressure discharge nipple and the other
end to spray gun.
Relief Valve — Secondary pressure release in the
unlikely event the unloader valve fails.
Unloader Valve — Safety device which, when the
spray gun closes, prevents over pressurization.
Control Box
Pump
Unloader
Valve
Wand
High
Pressure
Nozzle
Detergent
Screen
Gas Valve
High
Pressure
Hose
GFCI
Spray Gun
Relief Valve
Exhaust Stack

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
OPERATOR’S MANUAL PRESSURE WASHER
8
ASSEMBLY INSTRUCTIONS
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 distributor or carrier concerning
discrepancies.
1. Cut strapping band from pressure washer and
pallet.
2. Remove pressure washer from pallet.
Parts Included
• Hotsy High Pressure Washer
• High Pressure Hose
• Hose/GFCI Cord Hanger
• Wand
• Trigger Gun
• Operating Instruction and Parts Manual
• Parts Bag Containing:
■ Pressure Nozzle
■ Quick Disconnect
■ Quick Disconnect Plug
Tools Required
• 10" Adjustable Wrench (1 ea.)
• Medium Phillips Head Screwdriver (1 ea.)
• Large Slotted Head Screwdriver (1 ea.)
• 3/16" Allen Wrench (1 ea.)
•
Pipe Thread Sealing Compound For Gas Connec-
tors
• Teflon Tape
1. Install Hose/GFCI Cord Hanger on coil tank as shown
in Figure 1.
Figure 1 - Hose/GFCI Cord Hanger
Hose/GFCI
Cord Hanger
Pocket on
Coil Tank
Pressure Hose, Trigger Gun and Wand
1. When assembling, use teflon tape on all plumbing
connections to prevent leakage.
2. Install the pressure hose on the pressure washer as
shown in Figure 2.
3. Assemble wand components as shown in Figure 3.
NOTE: The pressure nozzle is not to be installed
at this time.
4. Make sure all plumbing connections are tight.
Figure 3 - Trigger Gun/Wand Assembly
Trigger Gun Wand
Pressure
Hose
89142460-4
Figure 2 - Pressure Hose
Valve, Safety Relief
Pressure Hose

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
9
PRESSURE WASHER OPERATOR’S MANUAL
INSTALLATION INSTRUCTIONS
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 codes.
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 should comply with the local
codes covering such installations.
Venting
DANGER: Do not run machine indoors or in an
enclosed area without proper ventilation, 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.
DANGER: Some gases are heavier than air and will
spill out on the floor in the time required for the safety
pilot valve to close off gas supply. Therefore, always
provide adequate space and ventilation around this
pressure washer.
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 exhaust to the
outside atmosphere. Be sure the flue is the same size
as the burner exhaust vent on the pressure washer lid.
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 gas fired pressure washer
must have a draft diverter installed in the flue (available
from most heating contractors). A draft diverter will permit
proper upward flow of exhaust flue gases.
Using LP Vapor Fuel From A Portable Bottle
CAUTION: Have a qualified gas service technician
install and service your equipment.
The model 771 has been factory built to use LP Vapor
fuel. DO NOT USE LIQUID FUEL.
You will need the following items:
• LP vapor fuel tank. We recommend using a mini-
mum 30-40 lb. bottle. Bottle must have a shut-off
valve.
• LP gas hose. Four foot long minimum, 3/4" inside
diameter. Must have 3/4" male NPT thread end
to attach to machine. Available through Hotsy,
Part Number 707452. This hose is supplied in the
771 Portable Gear/LP Bottle Rack Kit, Part Number
280771.
• Gas primary regulator. Controls the pressure from
the gas bottle into the gas valve. Regulator must
be capable of handling 376,000 BTU/Hr. with an
adjustment range of 12.0 to 14.0 water column
inches. Available through Hotsy, Part Number
860178.
• Gas pressure gauge or gas manometer
• 10" Adjustable wrench
• Medium Phillips head screwdriver
• Large slot head screwdriver
• 3/16" Allen wrench
• Pipe thread sealing compound for gas
connections
1. Disconnect the machine from the power source.
2. Remove the chassis front panel to gain access to the
gas valve. Refer to Figure 4.
3. Turn the gas valve ON/OFF knob to the OFF
position.
30 - 40
lbs.
LP
Vapor
Tank
Figure 4 - LP Vapor Gas
To
Burner
Ring
ON/OFF
Knob
Gas Valve
✽ Gauge
Front Chassis
Panel
✽ Pressure
Hose (707214)
Inlet Pressure Tap
✽ Primary
Regulator
(860178)
✽ Shut-
Off
Valve
✽ Not Supplied w/Machine

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
OPERATOR’S MANUAL PRESSURE WASHER
10
INSTALLATION INSTRUCTIONS
4. Use pipe thread sealing compound at all hose connec-
tions and at gauge port pipe plugs to prevent leaks.
DO NOT use teflon plumbing tape.
5. Attach a 3/4" inside minimum diameter LP gas hose
to the inlet port of the machine. Make sure you use
a hose that is suitable for LP gas.
6. Install the gas pressure gauge or manometer into
the gas valve inlet pressure tap. The reading at this
location will indicate the incoming gas pressure from
your gas bottle primary regulator.
It is very important that the incoming gas pressure
be between 12.0-14.0 water column inches (.43 - .50
PSI).
WARNING: Maximum inlet pressure to machine 14.0
water column inches (.50 PSI).
To control the pressure from the LP bottle you must have
a primary regulator. If you purchase a regulator from
Hotsy, Part Number 860178, it will be preset from the
manufacturer and should not require adjustment. If your
primary regulator does not produce the correct pressure
range contact your local Hotsy Service Representative.
After connecting the gas hose to your regulator, install
the regulator on the bottle. The regulator 860178 has
a POL fitting which will screw directly into an LP Vapor
fuel bottle.
7. The gas pressure coming out of the gas valve and
going to the burner ring has been factory set and
should not require adjustment. If you replace your
gas valve, you will need to adjust the new valve for a
burner ring gas pressure of 11 water column inches
(.39 PSI). Follow the installation and adjustment in-
structions provided with your replacement valve.
8. After correct pressures have been established,
remove gauge and replace with pipe plug.
9. Always check new gas line connections for leaks with
soapy water.
10. Reinstall the chassis front panel on the machine.
Converting From LP to Natural Gas Fuel
CAUTION: Have a qualified gas service technician
modify, install and service your equipment.
The Model 771 has been factory built to use LP Vapor fuel,
however this model can be field converted to run on natural
gas fuel. It is very important to follow these instructions
when converting the unit for natural gas fuel.
Modifications will need to be made to several components
within the washer. Before starting, disconnect gas and
electrical power supply from the machine.
You will need the following items:
• Gas pressure gauge or gas manometer
• 10" Adjustable wrench
• Medium Phillips head screwdriver
• Large slot head screwdriver
• 3/16" Allen wrench
• Pipe thread sealing compound for gas connections
• Drill and drill bit #55 (.052)
• Natural gas orifice, Part Number 753141
• LP To Natural Gas Regulator Valve Conversion Kit
Part Number 753142
1. Remove both the chassis front and rear panels from
the machine to gain access to the burner assembly.
2. Turn the gas valve ON/OFF knob to the OFF position.
Refer to Figure 5.
3. Disconnect the wire leads to the gas valve.
4. Remove the burner ring assembly from the machine by
removing the U-bolt and the two nuts. Save all hard-
ware for reassembly after modifications are made.
5. Disconnect the aluminum gas line from the pilot.
(Refer to Burner Assembly).
6. Carefully remove the LP gas pilot from the burner ring
(Refer to Figure 6).
7. Remove the LP gas orifice from the pilot (Refer to
Figure 6).
8. Install natural gas orifice, Part Number 753141.
9. Carefully remove burner nozzles from burner ring.
Figure 5 - Gas Valve
Outlet Pressure Tap
To Burner Ring
Pilot Outlet
Pilot Adjustment
(Under Cap Screw)
ON/OFF Knob
Inlet Pressure Tap
Pressure Regulator
Adjustment
(Under Cap Screw)
Gas Valve
✽Gauge
Connect Gas
Here
✽ Not Supplied w/Machine
Figure 6 - LP Gas Pilot
Burner Ring
Gas
Pilot
Gas Orfice &
Alumninum Gas Line
Wire Lead To
Gas Regulator
Valve

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
11
PRESSURE WASHER OPERATOR’S MANUAL
10. Enlarge the diameter of each nozzle using a #55
drill bit (.052"). Make sure the holes are drilled
straight and all metal shavings are cleared from
inside nozzles. Carefully reinstall the nozzles into
the burner ring, do not over tighten, do not use pipe
thread sealing compound.
11. Remove regulator cap screw, pressure regulator
adjustment screw and spring. (Refer to Figure 7.)
12. Install the replacement spring, supplied in the Natu-
ral Gas Conversion Kit. (Refer to Figure 7.)
13. Install the new plastic pressure regulator adjustment
screw. Assure that the screw top is flush with the
regulator top.
14. Replace the natural gas pilot. Inspect compression
fittings on aluminum gas line. If fittings are dam-
aged, replace with compression fitting supplied with
orifice kit. To replace compression fittings cut the
aluminum gas line as close to the old compression
fitting
as possible. Install new compression fitting. Install
aluminum gas line into pilot and tighten.
15. Install the burner ring assembly into the chassis and
secure.
16. Connect your natural gas supply to the inlet port of
the machine gas plumbing. (Refer to Figure 5.)
IMPORTANT: This gas line must be provided with a
shut off valve.
17. Install the gas pressure gauge or manometer into the
gas valve inlet pressure tap. This reading will indicate
the incoming gas pressure from your gas supply.
18. It is very important that the incoming gas pressure
be between 4.5 - 14.0 water column inches (.16
- .50 PSI). If adjustment is necessary, it must be
done by a qualified gas service technician.
WARNING: Maximum inlet pressure to machine 14.0
INSTALLATION INSTRUCTIONS
water column inches (.50 PSI).
19. Next install the gas gauge or manometer in the outlet
pressure tap port of the gas valve. (Refer to Figure
5.) This reading will indicate the gas pressure going
to the burner ring.
20. Because of the safety features within the gas valve,
adjustment of the burner ring gas pressure can
only be made while the machine is running and the
burner is lit. Follow the instructions under Before
Starting and To Start for details to operate burner.
21. Turn pressure regulator adjustment screw clockwise
to increase gas pressure. Adjust gas pressure to 3.5
water column inches. (.13 PSI).
22. Turn off the burner and pump. Shut off gas supply
to the machine before removing the gas gauges or
manometers. Always check new gas line connec-
tions with soapy water for leaks.
23. Install the new cap screw. (Refer to Figure 7.)
24. Remove LP gas label on gas valve.
25. Reinstall the chassis front and rear panels on the
machine.
Converting from Natural Gas
to LP Vapor Gas
CAUTION: Have a qualified gas service technician
install and service your equipment.
To convert back to LP vapor fuel, it is important to follow
the following instructions.
Modifications will need to be made to several components
within the washer. Before starting, disconnect gas and
electrical power supply from the machine.
You will need the following items:
• Gas pressure gauge or gas manometer
• 10" Adjustable wrench
• Medium Phillips head screwdriver
• Large slot head screwdriver
• 3/16" Allen wrench
• 44 gas nozzles #66 orifice Part Number 908260
• LP Vapor gas pilot Part Number 829858
• LP Vapor gas conversion kit Part Number 753138
• LP Vapor fuel tank. We recommend using a mini-
mum 30 - 40 lb bottle. Bottle must have a shut-off
valve.
• LP gas hose - four feet long minimum, 3/4" inside
diameter. Must have 3/4" male NPT thread end
to attach to machine. Available through Hotsy,
Part Number 707432. This hose is supplied in the
771 portable gear/LP bottle Rack Kit, Part Number
280771.
• Gas primary regulator. Controls the pressure from
the gas bottle into the gas valve. Regulator must
be capable of handling 376,000 BTU/Hr. with an ad-
justment range of 12.0 to 14.0 inches Water Column.
Figure 7 - Pressure Regulator
PARTS
CAPSCREW
PRESSURE REGULATOR
ADJUSTING SCREW
SPRING
BLACK
BLACK
RED
SILVER
BLACK
STAINLESS
STEEL
COLOR CODE FOR
LP GAS NATURAL GAS
Pressure Regulator Housing

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
OPERATOR’S MANUAL PRESSURE WASHER
12
INSTALLATION INSTRUCTIONS
Available through Hotsy, Part Number 860178.
1. Refer to Converting to Natural Gas and follow steps
1 through 6.
2. Discard pilot and replace with LP vapor gas pilot,
Hotsy Part Number 829858.
3. Carefully remove burner ring nozzles.
4. Replace the natural gas nozzles with the #66 gas
nozzles. It is important to replace them as LP vapor
gas is required to use smaller orifice gas nozzles
than natural gas. When installing the nozzles into the
burner ring, do not over tighten and do not use pipe
thread sealing compound.
5. Refer to Converting to Natural Gas and follow steps
11 through 13 except use LP Vapor Conversion Kit
instead of Natural Gas Conversion Kit. (Refer to
Figure 8.)
6. Refer to Converting to Natural Gas and follow steps
14 and 15.
7. To complete LP vapor conversion reference LP
Vapor Gas From A Portable Bottle and follow steps
4 through 11.

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
13
PRESSURE WASHER OPERATOR’S MANUAL
OPERATION INSTRUCTIONS
Before Starting
1. Read all manuals provided with this pressure washer.
Become familiar with location and function of all
operating and safety controls.
WARNING: Make sure all switches and controls are in
the OFF position prior to plugging in electrical cord.
DANGER: Do not stand in water while plugging or
unplugging electrical cord.
CAUTION: This pressure washer is equipped with a
UL approved ground fault circuit interrupter (GFCI)
power cord. Use UL grounded type receptacles
of proper voltage and amperage ratings. Where a
properly grounded receptacle is not available, it is
the personal responsibility of the owner to have one
installed. Always disconnect power before servicing
your pressure washer.
CAUTION: This machine is equipped with a 35 foot
long power cord protected by a ground fault circuit
interrupter (GFCI). DO NOT use extension cords
because of possible severe electrical shock and/or
damage to the machine.
DANGER: This equipment is designed to run on
vapor fuel. DO NOT use liquid fuel. Have a qualified
serviceman install and service your equipment.
2. Connect electrical cord to an overload protected
230VAC/60Hz/1PH grounded circuit, minimum 15
ampere rated. Test the GFCI using the reset and test
procedure located on the GFCI device. Do not use
machine if GFCI fails test. The GFCI must be reset
and tested with every use.
WARNING: Check hoses, fittings, wand, trigger gun
and fuel connections daily for signs of wear, cracks
and looseness, and replace as required.
3. Connect water supply hose to the garden hose con-
nector located on machine’s front. The water faucet
and supply hose must be capable of providing a
minimum of 3.0 gallons per minute (GPM).
4. Connect proper gas supply. See instructions under
Using LP Vapor Fuel and Converting to Natural
Gas.
5. Check pump oil level.
6. If detergents are to be used, only use detergents
intended for pressure washers. Follow instructions on
the detergent container.
IMPORTANT: Before installing nozzle on initial start-
up, turn on the water supply and pump switch and
allow water to run from the end of the wand until clear
to prevent the nozzle from clogging.
IMPORTANT: If the pressure washer has not been
used for an extended period of time, remove the
nozzle from the end of the wand and turn on water
supply and pump switch. Allow water to run from the
end of the wand until clear.
8. Install the pressure nozzle on end of wand, (refer to
Figure 8).
NOTE: To prevent damage to the pressure nozzle,
only place the wrench on hex area when tightening.
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 8). The trigger lock should be used
whenever the trigger gun is not in use.
IMPORTANT: Pump may require priming the first time
the pressure washer is run. See step 9.
9. If you are running the machine for the first time, or
the machine has been sitting for a period of time, the
pump may require priming. To prime the pump, run
pressure washer with only the pump switch on.
IMPORTANT: On initial start up or if a new gas bottle
is installed it is necessary to bleed the air from the
gas line before the pilot will light. Refer to step 10
for details.
10. If you are running the machine for the first time,
have changed the gas bottle, or have performed
maintenance to the burner assembly, there will
be air in the gas line. To bleed out the air from
the gas line, run pressure washer with pump and
burner switch on and thermostat on highest set-
ting. Squeeze trigger gun for 15 seconds. If the
burner has not ignited, release trigger for 5 seconds
and re-squeeze. If the burner has not ignited after
10 tries, see the Troubleshooting Guide in this
manual.
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 protec-
tion 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 trig-
ger of trigger gun released for more than 10 minutes
Figure 8 - Nozzle Installation/Manual Trigger Lock
Manual Trigger Lock
Pressure
Nozzle

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
OPERATOR’S MANUAL PRESSURE WASHER
14
OPERATION INSTRUCTIONS
at any one time or damage to pump may occur.
WARNING: If ignition or flame failure is experienced,
discontinue use of burner at once by turning burner
switch off. Have cause of failure corrected by an
authorized service technician. After corrections are
made, refer to OPERATION for start-up instructions.
1. Connect electrical cord and test GFCI device.
2. Turn on water supply.
3. Turn on gas supply.
4. Grasp wand firmly. Turn on pump switch.
5. Turn on burner switch, and adjust thermostat to
desired temperature.
6. Squeeze trigger of trigger gun. The pilot will auto-
matically ignite, quickly followed by the firing of the
burner ring. If ignition does not take place within 5 to 7
seconds see Troubleshooting Guide in this manual.
When the trigger of the trigger gun is released or ther-
mostat setting is reached, the burner will turn off.
To Clean
DANGER: Do not place hands or fingers in front of
high pressure spray. Bodily injury may result.
1. Insert the detergent inlet line into the container of
mixed detergent. The detergent metering valve on the
chassis allows the detergent flow to be controlled.
2. Adjust the width of the pressure nozzle spray pattern
to meet your cleaning needs. Adjustment is made
by rotating the outer housing of the pressure nozzle,
(refer to Figure 9). The spray pattern can be adjusted
from 0 degrees solid stream to 80° fan spray. Release
the trigger of the trigger gun prior to making any spray
pattern adjustments.
3. 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.
4. Do not wash at a 90° angle to 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.
5. Use the full width of the spray pattern to wash in a
wide path. Overlap spray paths for complete cover-
age. Wash from side to side, using slow, steady
motions.
6. 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.
7. Small parts should be washed in a basket so the
pressure does not push them away. Larger, lightweight
parts should be clamped down so the pressure does
not push them away.
8. To rinse, turn the detergent metering valve clockwise.
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
NOTE: If the machine is unplugged, the GFCI must
be reset prior to use. Always test GFCI before each
use.
1. If detergents were used, draw clean water through
the detergent inlet line to purge detergent. Failure to
do so may clog detergent metering valve.
2. If burner was used, turn OFF burner switch and
allow pump to run cold water through coil for several
minutes.
3. Turn OFF pump switch.
4. Turn OFF water supply.
5. Squeeze trigger of trigger gun to relieve system pres-
sure.
6. Turn off main shut-off valve on gas supply.
Figure 9 - Pressure Nozzle
Solid
Stream
Fan
Spray
Outer
Housing

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
15
PRESSURE WASHER OPERATOR’S MANUAL
Storage
DANGER: Do not store flammable liquids (gasoline,
diesel fuel, solvents, etc.) near pressure washer, or
in non-ventilated areas.
1. 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, fill the
float tank with antifreeze. Start machine and allow
to run until antifreeze flows from the end of the wand.
Squeeze and release the trigger gun several times to
antifreeze the unloader system. Also draw antifreeze
through the detergent inlet line to antifreeze the
detergent system. For added protection after
antifreezing, disconnect the pressure hose from
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.
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 sight glass window found on the rear of the pump, (refer
to Figure 11). During the break-in-period, make sure the
oil is changed after the first 25 hours of operation. After
that, replace oil every 3 months or 300 hours of operation,
whichever comes first.
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.
MAINTENANCE
• Use a water softener on the water system if known
to be high in mineral content.
• Use only high quality detergents and follow manu-
facturer’s mix recommendations.
• Flush the system with clean water immediately
after using detergent solutions.
• Clean filter screen on detergent inlet line periodi-
cally.
• Flush the pressure washer system with antifreeze
if storing for an extended period of time. Refer to
Storage for details.
Pump Motor
On a yearly basis, oil pump motor per instructions on
motor nameplate.
NOTE: Some motors may be equipped with perma-
nently lubricated bearings and will not require ad-
ditional lubrication.
Gas Burner
It is recommended that the gas burner be serviced yearly
or as needed. Contact your local service center.
Rupture Disk
If pressure from pump or thermal expansion should
exceed safe limits, the rupture disk will burst, allowing
high pressure to be discharged through hose to ground.
When the disk ruptures it will need to be replaced.
Caution: Inspect rupture disk annually for any
obstruction.
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 Figure 21, Item 3.
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 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.
Figure 10 - Pump Lubrication
Oil Fill
Sight Glass
Oil Drain

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
PRESSURE WASHER Troubleshooting Guide
16
TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
PRESSURE WASHER
WILL NOT RUN.
Pump switch in OFF position. Place switch in ON position.
Electric plug not fully
inserted into wall receptacle.
Insert plug fully into
known working receptacle.
GFCI tripped. Reset GFCI. Refer to instructions on GFCI.
Fuse blown or circuit breaker
tripped in electrical supply line.
Replace fuse or reset circuit breaker.
Use only circuits of adequate capacity.
Motor circuit
overload tripped.
Allow sufficient time for motor to cool
down. Depress red thermal protector
reset button, located on pump motor.
PRESSURE
WASHER RUNS
BUT WON’T SPRAY.
Trigger of trigger gun released. Squeeze trigger.
Water supply not turned on. Open water supply valve.
Clogged nozzle. Clean nozzle opening.
Inlet water screen clogged. Check screen and clean if necessary.
Pump lost its prime. Refer to Before Starting, Step 9.
LOW SPRAY
PRESSURE
AT NOZZLE.
Inadequate water supply. Fully open faucet. Check for kinked or
damaged hose. Use 5/8 inch minimum hose.
Check for debris clogging inlet screen.
Partially clogged
or damaged nozzle.
Clean or replace.
Air being drawn through deter-
gent inlet line.
Refill detergent container. Ensure that pick-up
screen is fully immersed.
UNEVEN SPRAY
PATTERN.
Partially clogged
or damaged nozzle.
Clean or replace.
POOR OR NO
DETERGENT FLOW.
Inadequate
detergent supply.
Refill detergent container. Ensure that pick-up
screen is fully immersed.
Detergent screen
or hose clogged.
Clean. Always start with a clean detergent
container.
Detergent metering
valve not opening.
Check that handle or
knob is not slipping on shaft.
POOR CLEANING. Improper detergent
concentration
or mixing.
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.

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
17
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
771/772 OPTIONAL EQUIPMENT
280263 Portagear/LP Rack Kit
When ordering from your dealer, please provide the following:
Model Number: 771/772
Machine Serial Number: ________________________________
Component Part Number: _______________________________
Description: __________________________________________
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.
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
BURNER WILL
NOT IGNITE WHEN
TRIGGER GUN
IS OPEN
Burner switch is off. Turn switch on.
Loose electrical connections. Tighten electrical connection.
Gas valve off. Turn gas valve on.
Pressure switch not operative. Test pressure switch and replace if defective.
Manual valve on
gas supply line is closed.
Open valve.
Low service
supply pressure.
Refer to Using LP Vapor Gas From A Portable
Bottle or Converting To Natural Gas, and sections
on how to check and set incoming pressure.
Ai in gas line. Refer to Before Starting, step 10.
Defective pilot flame rod. Replace.
Defective primary regulator. Replace.
Defective gas valve. Replace.
Pump switch turned off. Pump must be running before burner will light.
Inadequate water supply. Fully 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.
Adjustable thermostat
setting is too low.
Raise temperature setting.
BURNER
SMOKES OR HAS
OBNOXIOUS ODOR
Stack restriction. Refer to Venting under Installation.

HOTSY 771/772 • 8.941-246.0 • Rev. 12/10
33
PRESSURE WASHER WARRANTY
HOTSY LIMITED NEW PRODUCT WARRANTY
PRESSURE WASHERS
WHAT THIS WARRANTY COVERS
All Hotsy pressure washers are warranted by Hotsy to the original purchaser to be free from defects in materials and work-
manship under normal use, for the periods specified below. This Limited Warranty is subject to the exclusions shown below,
is calculated from the date of the original purchase, and applies to the original components only. Any parts replaced under
this warranty will assume the remainder of the part’s warranty period.
SEVEN YEAR PARTS AND ONE YEAR LABOR WARRANTY:
Components manufactured by Hotsy, such as frames, handles, top and bottom wraps, float tanks, fuel tanks, belt guards, and
internal components on the oil-end of HOTSY manufactured pumps. General, AR, Liberty, Comet and swash and wobble
plate pumps have a one year warranty. Heating coils have a five year warranty from date of original machine purchase.
ONE YEAR PARTS AND ONE YEAR LABOR WARRANTY:
All other components, excluding normal wear items as described below, will be warranted for one year on parts and
labor. Parts and labor warranty on these parts will be for one year regardless of the duration of the original component
manufacturer’s part warranty.
WARRANTY PROVIDED BY OTHER MANUFACTURERS:
Motors, generators, and engines, which are warranted by their respective manufacturers, are serviced through these manu-
facturers’ local authorized service centers. Hotsy is not authorized and has no responsibility to provide warranty service
for such components.
WHAT THIS WARRANTY DOES NOT COVER
This warranty does not cover the following items:
1. Normal wear items, such as nozzles, spray guns, discharge hoses, wands, quick couplers, seals, filters, gaskets,
O-rings, packings, pistons, pump valve assemblies, strainers, belts, brushes, rupture disks, fuses, pump protec-
tors.
2. Damage or malfunctions resulting from accidents, abuse, modifications, alterations, incorrect installation, improper
servicing, failure to follow manufacturer’s maintenance instructions, or use of the equipment beyond its stated us-
age specifications as contained in the operator’s manual.
3. Damage due to freezing, chemical deterioration, scale build up, rust, corrosion, or thermal expansion.
4. Damage to components from fluctuations in electrical or water supply.
5. Normal maintenance service, including adjustments, fuel system cleaning, and clearing of obstructions.
6. Transportation to service center, field labor charges, or freight damage.
WHAT YOU MUST DO TO OBTAIN WARRANTY SERVICE
In order to obtain warranty service on items warranted by Hotsy, you must return the product to your Authorized Hotsy
Distributor, freight prepaid, with proof of purchase, within the applicable warranty period. If the product is permanently
installed, you must notify your Authorized Hotsy Distributor of the defect. Your Authorized Hotsy Distributor will file a claim
with Hotsy, who must subsequently verify the defect. In most cases, the part must be returned to Hotsy freight prepaid
with the claim. For warranty service on components warranted by other manufacturer’s, your Authorized Hotsy Distributor
can help you obtain warranty service through these manufacturers’ local authorized service centers.
LIMITATION OF LIABILITY
Hotsy’s liability for special, incidental, or consequential damages is expressly disclaimed. In no event shall Hotsy’s liability
exceed the purchase price of the product in question. Hotsy makes every effort to ensure that all illustrations and specifica-
tions are correct, however, these do not imply a warranty that the product is merchantable or fit for a particular purpose, or
that the product will actually conform to the illustrations and specifications. Our obligation under this warranty is expressly
limited at our option to the replacement or repair at a service facility or factory designated by us, of such part or parts as
inspection shall disclose to have neen defective. THE WARRANTY CONTAINED HEREIN IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE ARE EXPRESSLY LIMITED TO THE DURATION OF THIS WRITTEN WARRANTY.
Hotsy does not authorize any other party, including authorized Hotsy Distributors, to make any representation or promise
on behalf of Hotsy, or to modify the terms, conditions, or limitations in any way. It is the buyer’s responsibility to ensure that
the installation and use of Hotsy products conforms to local codes. While Hotsy attempts to assure that its products meet
national codes, it cannot be responsible for how the customer chooses to use or install the product. Some states do not al-
low limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages,
so the above limitation or exclusion may not apply to you. This warranty gives you specific legal rights and you may also
have other rights which vary from state to state.
HOTSY
www.hotsy.com

If you are looking for replacement parts for your Hotsy, please contact your local dealer. You
can nd a dealer by calling Hotsy at 800-525-1976 or by visiting www.hotsy.com.

Form # 8.941-246.0 • Revised 12/10 • Printed in U.S.A. by Hotsy