Hotsy 790SS Service manual

97-6232
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!
MODELS 790SS, 790SS-208,
795SS, 795SS-208

790SS
●Pump Volume At Pump Head: 2.8 gpm/168 gph
●Pump Pressure At Pump Head: 2000 psi
●Burner Type: Fuel Oil Fired, 289,900 BTU/Hr.
●Burner Fuel Pressure: 140 psi
●Machine Voltage: 230Vac/60Hz/1Ph
●Total Machine Amperage: 20 Amps
●Machine Weight: 380 Lbs.
●Shipping Weight: 430 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions:
Length = 51", Width = 29", Height = 42"
790SS-208
●Pump Volume At Pump Head: 2.8 gpm/168 gph
●Pump Pressure At Pump Head: 2000 psi
●Burner Type: Fuel Oil Fired, 289,900 BTU/Hr.
●Burner Fuel Pressure: 140 psi
●Machine Voltage: 208Vac/60Hz/1Ph
●Total Machine Amperage: 22 Amps
●Machine Weight: 380 Lbs.
●Shipping Weight: 430 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions:
Length = 51", Width = 29", Height = 42"
795SS
●Pump Volume At Pump Head: 3.5 gpm/210 gph
●Pump Pressure At Pump Head: 2000 psi
●Burner Type: Fuel Oil Fired, 289,900 BTU/Hr.
●Burner Fuel Pressure: 140 psi
●Machine Voltage: 230Vac/60Hz/1Ph
●Total Machine Amperage: 24 Amps
●Machine Weight: 380 Lbs.
●Shipping Weight: 430 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions:
Length = 51", Width = 29", Height = 42"
795SS-208
●Pump Volume At Pump Head: 3.5 gpm/210 gph
●Pump Pressure At Pump Head: 2000 psi
●Burner Type: Fuel Oil Fired, 289,900 BTU/Hr.
●Burner Fuel Pressure: 140 psi
●Machine Voltage: 208Vac/60Hz/1Ph
●Total Machine Amperage: 27 Amps
●Machine Weight: 380 Lbs.
●Shipping Weight: 430 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions:
Length = 51", Width = 29", Height = 42"

3
CONTENTS
97-6232 • HOTSY 790SS • REV. 5/06
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.
Important Safety Information 4-5
Component Identification 6
Assembly Instructions 7
Installation Instructions 8
Operation Instructions 9
General Cleaning Techniques & Storage 10
Maintenance 11
Troubleshooting 12-13
Exploded Views & Parts List 14-17
Control Panel Assembly & Parts List 18-19
Burner Assembly & Parts List 20-21
Fuel Tank Assembly & Parts List 22
Float Tank Assembly & Parts List 23
Pump Assembly & Parts List 24
Coil Outlet Assembly & Parts List 25
Detergent Valve Assembly & Parts List 26
Hose, Spray Gun & Wand Assembly & Parts List 27
Spray Gun - Exploded View & Parts List 28-29
Pump - Exploded View & Parts List 30-32
VBA Unloader Exploded View and Parts List 33
Wiring Diagram 34
Warranty

97-6232 • HOTSY 790SS • REV. 5/06
OPERATOR’S MANUAL PRESSURE WASHER
4
IMPORTANT SAFETY INFORMATION
WARNING
RISK OF
ASPHYXIATION.
USE ONLY IN A WELL
VENTILATED AREA.
WARNING
READ OPERATOR’S
MANUAL
THOROUGHLY
PRIOR TO USE.
WARNING
HIGH PRESSURE
SPRAY CAN PIERCE
SKIN AND TISSUES.
CAUTION:To reduce the risk of
injury, read operating instruc-
tions carefully before using.
1.Read owner's manual thor-
oughly. Failure to follow in-
structions could cause mal-
function of the machine and
result in death, serious bodily
injury and/or property dam-
age.
2. Knowhowtostopmachineandbleedpres-
sures 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: Risk of asphyxia-
tion. Use this product only in a
well ventilated area.
5. When the machine is work-
ing, do not cover or place in
a closed space where ventila-
tion is not sufficient.
WARNING: Risk of fire. Do not
add fuel when the machine is
operating.
6. Risk of explosion — do not
spray flammable liquids or
operate in an explosive lo-
cation. Operate only where
open flame or torch is permit-
ted.
WARNING: Keep water spray
away from electrical wiring or fa-
tal electrical shock may result.
7. To protect the operator from
electrical shock, the machine
must be electrically ground-
ed. It is the responsibility of
the owner to connect this
machine to a UL grounded
receptacle of proper voltage
and amper-
age ratings. Do not spray water on or near electri-
cal components. Do not touch machine with wet
hands or while standing in water. Always discon-
nect power before servicing.
8. Grip cleaning wand securely with both hands be-
fore starting the cleaner. Failure to do this could
result in injury from a whipping
wand.
WARNING: High pressure
stream of fluid that this equip-
ment can produce can pierce
skin and its underlying tissues,
leading to serious injury and
possible amputation.
9. 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.
10. Never make adjustments on machine
while in operation;disconnect from
electrical source or shut off gas
valve.
WARNING: High pressure spray
can cause paint chips or other
particles to become airborne
and fly at high speeds.
11. Eye safety devices and foot
protection must be worn
when using this equipment.
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-in-
sulated areas of the pressure
washer when starting gasoline
engine.
12. Machines with shut-off trigger gun should not be
operated with the trigger in the off position for ex-
tensive periods of time as this may cause damage
to the pump.
13. Protect from freezing.
14. Be certain all quick coupler fittings are secured
before using pressure washer.
15. Do not allow acids, caustic, or abrasive fluids to
pass through the pump.
16. Inlet water must be from a cold, fresh city water
supply.
17. 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.
WARNING
RISK OF INJURY.
HOT SURFACES
CAN CAUSE BURNS
WARNING
RISK OF FIRE.
DO NOT ADD FUEL
WHEN OPERATING
MACHINE.
WARNING
PROTECTIVE EYEWEAR
AND CLOTHING MUST
BE WORN.
WARNING
KEEP WATER SPRAY
AWAY FROM
ELECTRICAL WIRING.

97-6232 • HOTSY 790SS • REV. 5/06
5
PRESSURE WASHER OPERATOR’S MANUAL
IMPORTANT SAFETY INFORMATION
18.The best insurance against an accident is precau-
tion and knowledge of the machine.
19. Do not operate this product when fatigued or under
the influence of alcohol or drugs. Keep operating
area clear of all persons.
20. Hotsy will not be liable for any changes made to
our standard machines, or any components not
purchased from Hotsy.
21. Do not overreach or stand on unstable support.
Keep good footing and balance at all times.
22.Follow maintenance instructions specified in man-
ual.
23. Cleaning area should be provided with adequate
slopes and drainage to reduce possibility of falls
because of slipery surfaces.
24. Turn burner off and cool to 100°F before turning
machine off.
25.Use extreme caution when moving pressure washer
over rough or uneven surfaces.
26.When applying detergents follow the safety rules on
the detergent label. Use detergent from a covered
D.O.T. approved container.
27.This machine has been provided with Warning and
Instruction decals for the safety of the operator. If

97-6232 • HOTSY 790SS • REV. 5/06
OPERATOR’S MANUAL PRESSURE WASHER
6
COMPONENT IDENTIFICATION
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.
Detergent Injector — Allows you to siphon and mix
detergents.
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.
Unloader Valve — Safety device which, when the
spray gun closes, prevents over pressurization (Not
Shown.)
Note:If trigger on spray gun is released for more
than 2 minutes, water will leak from the pump
protector. Warm water will discharge from pump
High Pressure
Hose
Spray Gun
Wand
Detergent Line
Pump
Unloader
Valve
Hose Reel
Bracket
Pump
Switch
Burner
Switch
Adjustable
Thermostat
GFCI
Motor
Fuel
Oil Tank
High
Pressure Nozzle
Coil

97-6232 • HOTSY 790SS • REV. 5/06
7
PRESSURE WASHER OPERATOR’S MANUAL
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 pal-
let.
2. Remove pressure washer from pallet.
Parts Included
• Pressure Washer
• Pressure Hose/Trigger Gun Assembly
• Wand Assembly
• Handle
• Envelope Including:
■Bolt 5/16" - 18 x 1-1/2" (4 ea.)
■Flange Nut 5/16" - 18 (4 ea.)
■Flat Washer 5/16" (4 ea.)
■Operating Instructions/Parts Manual
Tools Required
• 10" Adjustable Crescent Wrench (2 ea.)
• Teflon Tape
Pressure Hose, Trigger Gun and Wand
1. Use teflon tape on plumbing connections to prevent
leakage.
2. Install pressure hose on machine as shown in
Figure 1 - Pressure Hose Installation
Thermal
Rupture
Disk
Pressure
Hose
Figure 2 - Wand/Trigger Gun Assembly
Wand
Assembly
Pressure Hose/
Trigger Gun Assembly
Bolts, Washers
and Flange Nut
Handle
Figure 3 - Handle Installation
Figure 1.
3. Attach the wand assembly to the pressure hose/trigger
gun assembly as shown in Figure 2.
Handle
1. Remove plastic tubing from ends of handle.
2. Insert the handle through the holes in the chassis as
shown in Figure 3. Use the bolts, washers and nuts

97-6232 • HOTSY 790SS • REV. 5/06
OPERATOR’S MANUAL PRESSURE WASHER
8
INSTALLATION INSTRUCTIONS
Getting Started
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
where it is not readily influenced by outside sources
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 coming in contact with the pressure
washer. Moisture reaching the equipment will reduce the
pressure washer’s life. All installations should comply with
the local codes covering such installations.
Venting
CAUTION: All venting must be in accordance with ap-
plicable 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. Exhaust gases should not be vented into a
wall, a ceiling, or a concealed space of a building. Be sure
the flue is the same size as the burner exhaust vent on
the pressure washer. See Component Identification 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.
Oil Burner
Burner Air Adjustment: The oil burner is preset for
operation at altitudes below 3000 feet. If operated at
higher altitudes, it may be necessary to adjust the air band
setting. Adjust the air band 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 band 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.
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 ser-
viceman adjust your burner for a #1 or #2 smoke spot
on the Bacharach scale.
For additional burner component information, see
Burner Assembly. It is recommended that the oil burner
be serviced yearly or as needed. Contact your local
service center.
Figure 4 - Burner Air Band Adjustment
Air Shutter Locking Screw
Air Shutter
Air Band
Air Band Locking Screw
Air Shutter Locking
Screw

97-6232 • HOTSY 790SS • REV. 5/06
9
PRESSURE WASHER OPERATOR’S MANUAL
OPERATION INSTRUCTIONS
Before Starting
WARNING: Check hoses, guns, fittings, and fuel con-
nections daily for signs of wear, cracks and loose-
ness, and replace as required.
1. Read all manuals provided with this pressure washer.
Become familiar with location and function of all
operating and safety controls.
2. Connect water supply hose to the standard garden
hose connector. The water faucet and supply hose
must be capable of providing 3.0 gpm for 790SS,
790SS-208 and 4 gpm for 795SS, 795SS-208.
3. Fill fuel tank. Use kerosene, #1 grade home heating
oil, #1 or #2 diesel fuel. DO NOT USE GASOLINE,
CRANKCASE OIL DRAININGS OR WASTE OIL.
4. Check pump oil level.
5. If detergents are to be used, only use detergents
intended for pressure washers. Follow instructions on
the detergent container.
Electrical Connections
WARNING: Make sure all switches and controls are
in the OFF position prior to plugging in.
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.
Connect electrical cord and test the GFCI using the reset
and test procedures provided on the GFCI device. The
GFCI must be reset and tested with every use. Do not
use machine if the GFCI device fails test.
Nozzle Installation
IMPORTANT: Before installing 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
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. Allow water to run from the end of the wand
until clear.
1. Install the proper pressure nozzle for your cleaning
needs on the end of the wand. Refer to Figure 5.
IMPORTANT: The trigger gun provided with this pres-
sure washer is equipped with a manual trigger lock to
prevent accidental operation of the trigger gun; refer
to Figure 5.The trigger lock should be used whenever
the trigger gun is not in use.
To Start
IMPORTANT: The water must be turned on before
starting. Running the pump dry will cause damage
to pump seals and void warranty.
IMPORTANT: DO NOT allow the machine to run in
bypass for more than 10 minutes at any one time or
damage to pump may occur.
1. Turn water ON.
2. Hold gun firmly, squeeze trigger of trigger gun and turn
pump switch ON. Allow air to purge from system.
3. If HOT water is desired, turn burner switch ON.
Adjust thermostat to desired temperature.The burner
will fire immediately with a small puff of smoke. If
smoke continues refer to the Troubleshooting Guide
in this manual. When the trigger gun is closed the
burner will turn off.
To Stop
1. If detergents were used, draw clear water through the
detergent line to purge detergent.
2. If burner was used, turn off burner switch and allow
pump to run cold water through coil.
3. Turn pump switch OFF.
4. Turn OFF water supply.
Figure 5 - Nozzle Installation/Trigger Lock
Pressure Nozzle
Manual Trigger
Lock

97-6232 • HOTSY 790SS • REV. 5/06
OPERATOR’S MANUAL PRESSURE WASHER
10
CLEANING TECHNIQUES
Pre-rinse cleaning surface with fresh water. Place de-
tergent suction tube directly into cleaning solution and
apply to surface at low pressure (for best results, limit
your work area to sections approximately 6 feet square
and always apply detergent from bottom to top). Allow
detergent to remain on surface 1-3 minutes. Do not
allow detergent to dry on surface. If surface appears
to be drying, simply wet down surface with fresh water.
If needed, use brush to remove stubborn dirt. Rinse at
high pressure from top to bottom in an even sweeping
motion keeping the spray nozzle approximately 1 foot
from cleaning surface. Use overlapping strokes as you
clean and rinse any surface. For best surface cleaning
action spray at a slight angle.
Recommendations:
• Before cleaning any surface, an inconspicuous
area should be cleaned to test spray pattern and
distance for maximum cleaning results.
• If painted surfaces are peeling or chipping,
use extreme caution as pressure washer may
remove the loose paint from the surface.
• Keep the spray nozzle a safe distance from the
surface you plan to clean. High pressure wash a
small area, then check the surface for damage. If
no damage is found, continue to pressure wash-
ing.
CAUTION - Never use:
• Bleach, chlorine products and other corrosive
chemicals
• Liquids containing solvents (i.e., paint thinners,
gasoline, oils)
• Tri-sodium phosphate products
• Ammonia products
• Acid-based products
These chemicals will harm the machine and will dam-
age the surface being cleaned.
GENERAL CLEANING TECHNIQUES & STORAGE
RINSING
It will take a few seconds for the detergent to clear.
Apply safety latch to spray gun. Select and install de-
sired high pressure nozzle. NOTE: You can also stop
detergent from flowing by removing detergent siphon
tube from bottle.
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, attach
a short length of hose to the garden hose connector
located on the pump. Place the other end of the hose into
a container of antifreeze. Start machine and allow to run
until antifreeze flows from the end of the wand. Squeeze
and release the trigger of 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 Component Identification 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.

97-6232 • HOTSY 790SS • REV. 5/06
11
PRESSURE WASHER OPERATOR’S MANUAL
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 side of the pump; refer
to Figure 6. 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.
• 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 clear 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.
Fuel Tank
1. When reinstalling or replacing the drain plug in the
fuel tank, refer to Figure 7 for proper installation.
2. Insert the drain plug in the hole so that the face of the
expansion plug is flush against the tank.
3. Tighten the wing nut to 1/2" to 5/8" as shown.
Pump Motor
On a yearly basis, oil pump motor per instructions on
motor nameplate.
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 replace-
ment refer to Pump Assembly.
Burner Fuel Filter
Drain any water which has accumulated in fuel filter and
clean or replace element as needed. For replacement
parts, refer to Burner Assembly.
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.
Figure 6 - Pump Lubrication
Oil Fill/Dip Stick
Sight
Glass
Oil Drain
Figure 7 - Fuel Tank Drain Plug Installation
Fuel Tank Expansion Plug
1/2” to 5/8”
Wing Nut

97-6232 • HOTSY 790SS • REV. 5/06
PRESSURE WASHER Troubleshooting Guide
12
TROUBLESHOOTING

97-6232 • HOTSY 790SS • REV. 5/06
13
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
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.
OPTIONAL EQUIPMENT
❍860201 16" Swivel Hose Reel
❍860202 13" Swivel Hose Reel
✰860203 16" Fixed Hose Reel
✰860204 13" Fixed Hose Reel
❍Requires the following items:
707426 Hose 3/8" x 36" (1 ea.)
644802 Street Elbow 3/8" (2 ea.)
✰Requires the following items:
707426 Hose 3/8" x 36" (1 ea.)
644802 Street Elbow 3/8" (1 ea.)
When ordering from your dealer, please provide the following:
Model Number: 790SS, 790SS-208, 795SS, 795SS-208
Machine Serial Number: ________________________________
Component Part Number: ______________________________
Description: __________________________________________

97-6232 • HOTSY 790SS • REV. 5/06
OPERATOR’S MANUAL PRESSURE WASHER
14
KEEPGUARDINPLACE
ATALLTIMES
OFF
F°
10-02033
200
165
130
95
235
270
300
TEMPERA
TURE
BURNER
RESET
PUMP
ON
OFF
WARNING
EXPLODED VIEW - LEFT SIDE
Brake Assembly
65
62 64
61
63
60
30
32
1
51
31
33
35
2
For
Detail See
Control
Box Assy.
27
3
4
50
49
58
59
22
43
23
21
17
16
34
26
25
66
67
20
19
18
6
28
11
29
6
For
Detail See
Coil Outlet
Assy.
To Float
Tank
To
Detergent
Injector
Foot Brake Detail
(Reversed View)

97-6232 • HOTSY 790SS • REV. 5/06
15
PRESSURE WASHER OPERATOR’S MANUAL
EXPLODED VIEW - RIGHT SIDE
For
Detail See
Float Tank
Assy.
For
Detail See
Detergent
Valve
Assy.
24
42
37
38
13
12
14
15
39
12 6
36
48
40
44
47
45 10
41
For
Detail See
Fuel Tank
Assy.
9
12
For
Detail See
Burner
Assy.
615
12
6
57
48
46
47
6
5
7
8
53
For
Detail See
Brake
Assy.
6
55
52
7
8
54
68

97-6232 • HOTSY 790SS • REV. 5/06
OPERATOR’S MANUAL PRESSURE WASHER
16
EXPLODED VIEW PARTS LIST
ITEM PART NO. DESCRIPTION QTY
1 375000 Coil 1
2 646328 Hotsy Decal 2
3 375452 Coil Tank 1
4 646342 Nozzle Identification Decal 1
5 859815 Grommet (Nozzle Holder) 3
6 703107 Flange Nut 5/16" - 18 20
7 780452 Flat Washer 5/16" 5
8 612975 Bolt 5/16" - 18 x 1-1/2" 5
9 834086 Chassis Decal 2
10 375530 Chassis 1
11 785011 Motor, 4Hp230V1Ph (790SS) 1
5-1084 Motor, 4Hp200V1Ph (790SS-208) 1
784411 Motor, 5Hp230V1Ph (795SS) 1
5-10531 Motor, 5Hp200V1Ph (795SS-208) 1
12 90-400500 Flat Washer 5/8" 8
13 983013 Wheel 12-1/2" 4
14 848616 Push Nut 4
15 817322 Hubcap 4
16 780451 Flat Washer 1/4" 5
17 615952 Bolt 1/4" - 20 x 3/4" 3
18 830376 Pulley, 2AK44 (790SS, 790SS-208) 1
5-40408501 Pulley, BK34 (795SS, 795SS-208) 1
19 815133 Pulley Bushing 1
20 809184 Belt, AX31 (790SS, 790SS-208) 2
5-604034 Belt, BX35 (795SS, 795SS-208) 1
21 615826 Beltguard 1
22 4-02047722 Hose 3/8" x 22" 1
23 834180 Beltguard Warning Decal 2
24 375507 Hose Reel Mount 1
25 615532 Bolt 8 mm x 16 mm 4
26 780479 Lock Washer 8 mm 4
27 11-0328 Operating Instructions Decal 1
28 826167 Strain Relief 1
29 703127 Strain Relief Nut 1
30 213044 Burner Exhaust Vent 1
31 860102 Retaining Ring 1
32 873779 Vent Insulation 1
33 824115 Exhaust Vent Clip 4
34 220501 Pump Base 1
35 861644 Hose Hanger 1
36 834159 Hotsy Detergent Decal 1
37 613025 Bolt 1/2" - 13 x 5" 1
38 780455 Flat Washer 1/2" 1
39 444438 Detergent Metering Decal 1
40 834185 Decal Water Inlet 1
ITEM PART NO. DESCRIPTION QTY
41 834154 Winterize Decal 1

97-6232 • HOTSY 790SS • REV. 5/06
17
PRESSURE WASHER OPERATOR’S MANUAL
EXPLODED VIEW PARTS LIST
42 612949 Bolt, 5/16” x 3/4” NC Grade 5 CS Zinc 2
43 715755 Coil Drain Plug 1
44 824102 Cord Clip 1
45 815329 Snap Bushing 1
46 630609 Cord Clamp 1
47 935175 Screw #10 - 24 x 1/2" 3
48 703105 Flange Nut #10 - 24 3
49 11-0326 Decal, Inst./Warning 1
50 873778 Pancake Insulation 1
51 873777 Coil Insulation 1
52 262020 GFCI Cord Hanger 1
53 859806 Grommet (Wand Holder) 1
54 630610 Vinyl Cap 1
55 210001 Machine Handle 1
56 2-0052 Nipple, 1/2" JIC x1/2 MNPT 1
57 780460 Fender Washer 5/16" 3
58 698247 Nipple, 1/2” x 2” 1
59 754717 Tee, 1/2” 1
60 95-07104827 Lever, Brake 1
61 95-07104829 Linkage, Brake, Red 1
62 95-07104828 Bracket, Brake Pad, Red 1
63 90-100472 Bolt, 1/4”-20 x 1.0 PLT, Carriage, Zinc 4
64 703185 Nut, 1/4” ESNA, NC 4
65 780451 Washer, 1/4” Flat, SAE 10
66 919667 Pulley, 2AK 64 H (790SS, 790SS-208) 1
919498 Pulley, BK 85H (795SS, 795SS-208) 1
67 815202 Bushing, Sheave, H x 24mm 1
68 9.800-049.0 Label, Cleaning Solution 1

97-6232 • HOTSY 790SS • REV. 5/06
OPERATOR’S MANUAL PRESSURE WASHER
18
CONTROL PANEL ASSEMBLY
ITEM PART NO. DESCRIPTION QTY
1 646033 Control Box Decal 1
2 950186 Pump Switch 1
3 875477 Screw #10 - 32 x 1/2" 2
4 703126 Hex Nut #10 - 32 2
5 829960 Hole Plug 1
6 950187 Burner Switch 1
7 915390 Thermostat Mount Plate 1
8 835150 Thermostat Dial 1
9 615411 Control Box Front 1
10 936659 ▲Ground Wire w/Bolt 1
11 955930 Thermostat 1
12 735321 Screw 4 mm x 6 mm 2
13 615414 Control Box Back 1
14 615952 Bolt 1/4" - 20 x 3/4" 3
15 780502 Lock Washer 1/4" External Tooth 1
16 703106 Flange Nut 1/4" - 20 4
17 6-051562 Strain Relief 4
ITEM PART NO. DESCRIPTION QTY
CONTROL PANEL PARTS LIST
20
21
23
24
17 27
26
9
1
25
22
13
18
14
19
2
4
7
12
8
6
5
3
11
15
16

97-6232 • HOTSY 790SS • REV. 5/06
19
PRESSURE WASHER OPERATOR’S MANUAL
18 703127 Locknut, 1/2" 4
19 825989 Cord 12/3 SJO 27"
20 826009 Cord 16/4 SJO 50"
21 630682 Power Cord w/GFCI, 20A(790SS Only) 1
631004 Power Cord w/GFCI, 30 Amp 1
22 847750 Cable Wrap 12"
23 444459 Decal Cord 1
24 646020 Decal GFCI 1
25 70-180503 Screw, M4 x 10 4
26 70-030207 Nut, 4
27 875651 Switch, Pressure 1
▲Not Shown
CONTROL PANEL PARTS LIST

97-6232 • HOTSY 790SS • REV. 5/06
OPERATOR’S MANUAL PRESSURE WASHER
20
BURNER ASSEMBLY
BURNER PARTS LIST
ITEM PART NO. DESCRIPTION QTY
1 615964 Burner 1
2 698020 Nipple, 1/4" NPT x 1/4" H 1
3 644750 Elbow, 1/4" Street 1
4 698200 Nipple, 1/4" x 2-1/2" 1
5 615279 Bushing, 3/8" - 1/4" 1
6 851080 Fuel Filter Assembly 1
7 799131 Nipple, 1/4"H x 3/8"MNPT 1
8 944845 Fuel Pump w/230V Solenoid 1
9 944413 Fuel Solenoid 1
10 890718 Transformer 1
11 723367 Electrode Assembly 1
12 825616 Air Cone, F-16 1
13 079506 Nozzle, 1.75 A 90° 1
14 783741 Motor 1
15 867368 Hose, 1/4” Push-On, Fuel Line 18"
16 707116 Hose, 1/4” Fuel Line, Green 21"
17 823998 Clamp, Hose 2
875590 ▲Filter Screen Replacement 1
ITEM PART NO. DESCRIPTION QTY
5/32”
1/16”
5/16”
16
13
17
7
6
11
10
9
8
12
14
5
4
3
2
17
15
1