Kärcher SSE-503007A User manual

9.800-187.0
MODEL # ORDER #
HDS 4.8/30 Ea / SSE-503007A 1.575-620.0
HDS 4.8/30 Eb / SSE-503007B 1.575-621.0
HDS 4.8/30 Ec / SSE-503007C 1.575-622.0
OPERATOR’S MANUAL
®
To locate your local Kärcher Shark Commercial Pressure Washer Dealer nearest you,
visit www.karchercommercial.com or www.karchershark.com

CONTENTS
2
620-622 • 9.800-187.0 • Rev. 9/10
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 & Important Safety Information 3-5
Component Identification 6
Set Up Procedures 7
Operating Instructions 7
Steam Combination 7
Shutdown Procedures 7
General Washing Techniques 8
How to Use the Detergent Injector 9
Preventative Maintenance and Service 10
Maintenance and Service 11-12
Preventative Maintenance Schedule 13
Troubleshooting 14-17
Exploded Views 18-19
Exploded View, Parts List 20-21
Float Tank Exploded View & Parts List 22
Hose and Spray Gun Assembly 23
Pump Assembly, Exploded View and Parts List 24-25
Control Panel, Exploded View and Parts List (1.575-620.0,-621.0) 26-27
Control Panel, Exploded View and Parts List (1.575-622.0) 28-29
Steam Pump Exploded View & Parts List 30
Burner Specifications 31
KT.1 Series Pump Exploded View and Parts List 32-33
VRT 3 Exploded View and Parts List 34
PA8 5-3026 Unloader Exploded View and Parts List 35-36
Warranty

620-622 • 9.800-187.0 • Rev. 9/10
3
PRESSURE WASHER OPERATOR’S MANUAL
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 thor-
oughly. Failure to follow instruc-
tions could cause malfunction of
the machine and result in death,
serious bodily injury and/or
property damage.
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. 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.
5. 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:
OPERATE ONLY WHERE
OPEN FLAME OR TORCH
IS PERMITTED
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.
6. In oil burning models, use only kerosene, No. 1
home heating fuel, or diesel. If diesel is used, add
a soot remover to every tankful.
RISK OF FIRE.
DO NOT ADD FUEL
WHEN OPERATING
MACHINE.
WARNING
WARNING: Risk of fire — Do not
add fuel when the product is
operating or still hot.
WARNING: Do not use gasoline
crankcase draining or oil con-
taining gasoline, solvents or
alcohol. Doing so will result in
fire and/or explosion.
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 machine.
8. Do not allow acids, caustic or abrasive fluids to pass
through the pump.
9. Never run pump dry or leave spray gun closed
longer than 1-2 minutes.
10. Keep operating area clear of all persons.

620-622 • 9.800-187.0 • Rev. 9/10
OPERATOR’S MANUAL PRESSURE WASHER
4
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.
WARNING
PROTECT FROM
FREEZING
WARNING: Protect machine from
freezing.
15. 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.
16. 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.
17. Avoid installing machines in
small areas or near exhaust
fans. Adequate oxygen is
needed for combustion or
dangerous carbon monoxide
will result.
18. Manufacturer will not be liable for any changes
made to our standard machines or any components
not purchased from us.
19. 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.
20. Do not overreach or stand on unstable support.
Keep good footing and balance at all times.
21. Do not operate this machine when fatigued or under
the influence of alcohol, prescription medications,
or drugs.
IMPORTANT SAFETY INFORMATION
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.
11. Eye, hand, and foot protection
must be worn when using this
equipment.
WARNING
EAR PROTECTION
MUST BE WORN
WARNING: This machine
exceeds 85 db appropriate ear
protection must be worn.
WARNING
HOT DISCHARGE FLUID:
DO NOT TOUCH OR
DIRECT DISCHARGE
STREAM AT PERSONS.
WARNING: 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.
12. 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.
13. Never make adjustments
on machine while in opera-
tion.
14. Be certain all quick coupler fit-
tings are secured before using
pressure washer.

620-622 • 9.800-187.0 • Rev. 9/10
5
PRESSURE WASHER OPERATOR’S MANUAL
IMPORTANT SAFETY INFORMATION
Follow the maintenance instructions
specified in the manual.

620-622 • 9.800-187.0 • Rev. 9/10
OPERATOR’S MANUAL PRESSURE WASHER
6
Detergent
Pickup
Tube
Detergent
Bucket
(not included)
High Pressure
Nozzle
High
Pressure
Hose
Burner
Switch
Water Supply
Hose
(not included)
Trigger
High
Pressure
Nozzles
Hour
Meter
Spray Gun
Variable
Pressure
Wand
Burner Fuel
Tank
Float Tank
Quick
Coupler
Pump
Switch
Optional
Kit
#30-199
COMPONENT IDENTIFICATION

620-622 • 9.800-187.0 • Rev. 9/10
7
PRESSURE WASHER OPERATOR’S MANUAL
SET UP PROCEDURES
Place machine in a convenient location providing ample
support, drainage and room for maintenance.
Location:
1. Location of machine is important. Avoid installing
near combustible material or in poorly ventilated
areas. Machines are intended to be protected from
the outside environment.
2. Electrical connection to machine should be the
proper voltage, phase and amperage. See spec-
ifications for particular model. A power plug is
not provided to ensure proper connection by an
electrician.
3. Water source for machines should be supplied by a
5/8" I.D. garden hose with a city water pressure of
not less than 30 PSI. If the water supply is inade-
quate, or if the garden hose is kinked, the machine
will run very rough and the burner will not fire.
CAUTION: Use only fresh water in pressure
washer.
4. Fill diesel fuel tank with kerosene, No. 1 home
heating fuel or diesel.
OPERATING INSTRUCTIONS
1. Read safety, installation and preventative mainte-
nance instructions before starting machine.
2. Connect the water supply hose to the float tank
inlet swivel connector and turn on water supply.
3. Check fuel tank level.
4. Connect the high pressure hose quick coupler to
the discharge nipple by sliding quick coupler col-
lar back and inserting the quick coupler onto the
coupler nipple and pushing the quick coupler collar
forward to secure it.
5. Connect the wand, nozzle, hose and spray gun
(where applicable). Use teflon tape on pipe thread
connections to avoid water leaks (see component
identification).
6. Plug the power cord into the proper power supply.
(Refer to serial plate for information.)
7. Grip spray gun and wand handle securely.
8. Before installing pressure nozzle into wand
coupler, run machine allowing water to flush
through the system until clear.
9. For auto start machines only: Press the pump
switch “ON” and then pull trigger on the spray gun
to activate pressure switch which starts machine.
When a steady stream of water flows from the
spray gun and wand, turn the thermostat knob
to the 200° mark, then push the burner switch.
(Burner will light automatically.)
For time delay shut down machines: Simply
press pump switch "ON" and the machine will
start.
10. Turn the variable pressure control handle
clockwise to increase pressure.
11. To apply detergent, place detergent hose into
detergent container and open detergent valve.
GENERAL WASHING
TECHNIQUES
These machines are equipped with a spray gun and
various nozzle patterns. Use the wide patterns on easy
soil removal jobs and the narrow patterns on the more
difficult jobs or tight areas such as cracks and holes.
In most cases faster results and better detergent
economy will be obtained by applying the detergent
and letting it “set” for a few minutes prior to rinsing.
This enables it to do its soil penetrating and loosening
work.
Most cleaning work terminates with a high pressure
rinse as part of the normal cleaning procedure. In
some cases, however, the last operation may be the
application of a detergent (a sanitizer, for example).
After such work, run the machine using rinse water for
20-30 seconds to clear the pump and lines.
SHUTDOWN PROCEDURES
1. Place detergent line in a bucket of clear water al-
lowing detergent to be flushed from system. Then
turn detergent valve off.
2. Push burner switch off and pull spray gun allowing
water to flow, which will cool down the heating
coil.
3. After water has cooled, release the trigger on the
spray gun, which will activate a timer to shut the
machine off after one minute. Turn the pump switch
off if the machine is going to be left unattended.
4. Turn water off.
5. Protect from freezing (see Winterizing
Procedures).
STEAM COMBINATION
1. Turn the steam unloader valve counterclockwise
lightly until you feel resistance. (Detergent will not
siphon when the steam unloader valve is open.)
NOTE: The steam mode is built into the unloader.
Just turn the unloader adjustment knob counter-
clockwise until you feel resistance.
OPERATING INSTRUCTIONS

620-622 • 9.800-187.0 • Rev. 9/10
OPERATOR’S MANUAL PRESSURE WASHER
8
2. Turn the thermostat knob to 270°. (The thermo-
stat is a high limit device and does not regulate
temperature.)
3. To stop, reverse steps 1 to 3 and set all controls
to their original settings.
4. Turn burner switch off, open trigger on spray
gun and allow water to cool.
PREVENTATIVE MAINTENANCE
1. Use clean fuel — kerosene, No. 1 home heating
fuel, or diesel. Clean or replace fuel filter every
100 hours of operation. Avoid water contaminat-
ed fuel as it will cause the fuel pump to seize.
De-soot coils monthly or use an additive
if diesel is being used.
2. Check to see that water pump is properly
lubricated (see pump lubrication below).
3. Follow Winterizing Procedures to prevent freeze
damage to pump and coils.
4. Always flush detergent from system after use.
5. If water is known to be high in mineral content,
use a water softener on your water system or
de-scale as needed.
6. Do not allow acidic, caustic or abrasive fluids to
be pumped through system.
7. Always use a high grade quality cleaning
detergents.
8. Never run pump dry for extended periods of
time.
9. Periodically delime coils per instructions.
1 0. If machine is operated with smoky or eye-burn-
ing exhaust, coils will soot up, preventing water
from reaching maximum operating temperature.
(See section on Burner Adjustments).
MAINTENANCE AND SERVICE
Pump Lubrication:
Use only SAE 30 weight non-detergent oil. Change oil
after first 50 hours of use. Thereafter, change oil every
three months or at 500 hour intervals. Oil level should
be checked through use of dipstick found on top of
pump or red dot visible through oil gauge window. Oil
should be maintained at that level.
Fuel:
Use clean fuel oil that is not contaminated with water
and debris. Use kerosene, No. 1 home heating fuel or
diesel. Drain fuel tank and replace fuel filter every 100
hours of operation.
Ignition Circuit:
Periodically inspect wires, spring contact and elec-
trodes for condition, security and proper spacing.
Transformer test: (CAUTION 10,000 VOLTS) use
defect free insulated screwdriver and keep fingers
off blade! Lay blade across one contact: OK if arc will
span 1/2" between end of blade and other contact.
(See illustration.)
Transformer Check
Electrode Setting
GENERAL CLEANING TECHNIQUES
Periodically Check Wiring Connections. If Nec-
essary To Adjust Electrodes, Use Diagram
Nozzle
Electrode5/32
1/4
5/32

620-622 • 9.800-187.0 • Rev. 9/10
9
PRESSURE WASHER OPERATOR’S MANUAL
WARNING: Some detergents
may be harmful if inhaled or
ingested, causing severe nau-
sea, fainting or poisoning. The
harmful elements may cause
property damage or severe
injury.
The machine can siphon and
mix detergents with the use of a
detergent injector kit.
1. Start machine as outlined in Operating
Instructions.
WARNING
RISK OF
ASPHYXIATION.
USE THIS PRODUCT
ONLY IN A WELL
VENTILATED AREA.
2. Place detergent pick-up tube into container of
detergent.
3. Adjust the metering valve to desired detergent
concentration.
4. When you finish washing, rinse by simply turning
the metering valve clockwise to increase pres-
sure.
5. For clean up, place detergent pick-up tube into
container of clear water and turn the metering
valve counterclockwise. Pull the trigger on the
spray gun for 2 minutes.
Detergent Metering
Valve
Detergent
Pick-up Tube
Detergent
Bucket
(not included)
Strainer
HOW TO USE THE DETERGENT INJECTOR

620-622 • 9.800-187.0 • Rev. 9/10
OPERATOR’S MANUAL PRESSURE WASHER
10
Fuel Control System:
These machines utilize a fuel solenoid valve located
on the fuel pump to control the flow of fuel to the
combustion chamber. This solenoid valve, which is nor-
mally closed, is activated by a flow switch when water is
flowing through it. When an operator releases the
trigger on the spray gun, the flow of water through the
flow switch stops, turning off the current to the fuel
solenoid. The solenoid then closes, shutting off the
supply of fuel to the combustion chamber. Controlling
the flow of fuel in this way allows for an instantaneous
burn or no burn situation, thereby eliminating high
and low water temperatures, and combustion smoke
normally associated with machines incorporating
a spray gun.
CAUTION: Periodic inspection is recommended to
insure that the fuel solenoid valve functions prop-
erly. This can be done by operating the machine and
checking to see that when the trigger on the spray gun
is in the off position, the burner is not firing.
Fuel Pressure Adjustment:
To adjust fuel pressure, turn the pressure adjusting
screw clockwise to increase, counterclockwise to
decrease. Do not exceed 200 psi.
NOTE: When changing fuel pump, a by-pass plug
must be installed in return line port or fuel pump will
not prime.
Air Adjustment:
Note: The oil burner on this machine is preset for op-
eration at altitudes below 1000 ft. If operated at higher
altitudes, it may be necessary to adjust the air band
setting. Adjust air band for a #1 or #2 smoke spot on
the Bacharach scale. A one-time initial correction for
your location will pay off in economy, performance,
and extended service life. If a smoky or eye-burning
exhaust is being emitted from the stack, two things
should be checked. First, check the fuel to be certain
that kerosene or No. 1 home heating fuel is being
used. Next, check the air adjustment on the burner.
An oily, smoky fire indicates a lack of air and the air
band should be moved to allow the air to flow through
the burner. Sharp eye-burning fumes indicate too
much air flowing through the combustion chamber.
The air band should be readjusted to allow less air
to flow through the burner.
To adjust Beckett burner: Start machine and turn
burner ON. Loosen two locking screws found in the
air shutter openings (refer to illustration) 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 posi-
tion previously noted. Tighten locking screws.
If the desired position cannot be obained 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.
Burner Nozzle:
Keep the tip free of surface deposits by wiping it with
a clean, solvent-saturated cloth, being careful not to
plug or enlarge the nozzle. For maximum efficiency,
replace the nozzle each season.
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 disk ruptures it will need to be replaced.
Cleaning of Coils:
In alkaline water areas, lime deposits can accumulate
rapidly inside the coil pipes. This growth is increased
by the extreme heat build up in the coil. The best
preventative for liming conditions is to use high quality
cleaning detergents. In areas where alkaline water is
an extreme problem, periodic use of Deliming Powder
(Part #98040590) will remove lime and other deposits
before coil becomes plugged.
PREVENTATIVE MAINTENANCE & SERVICE
Air Band
Adjustment
Screw
Air Band
Fuel
Pump

620-622 • 9.800-187.0 • Rev. 9/10
11
PRESSURE WASHER OPERATOR’S MANUAL
Deliming Coils:
Periodic flushing of coils is recommended.
Step 1 Fill the float tank with 4 gallons of water,
then add 1 lb. of deliming powder.
Mix thoroughly.
Step 2 Remove nozzle from the wand assembly
and put the wand and spray gun into float
tank. Attach a nylon stocking to the end of
the wand to collect debris.
Step 3 Turn pump switch on, allowing solution to
be pumped through coils and back into the
float tank. Solution should be allowed to
circulate 2 - 4 hours.
Step 4 After circulating solution, clean and drain
float tank and flush entire system with fresh
water. Replace nozzle in wand.
Spray Nozzles:
Each machine is equipped with four spray nozzles.
Different spray nozzles are calibrated for each
machine depending on the flow and pressure of
that particular model. Spray nozzles vary in bore
size and angle of spray. Popular spray angles are
0°, 15°, 25°, 40°. When ordering, please specify size
and angle of nozzle. Nozzle size for each machine
is located on the serial plate.
Unloader Valve:
The unloader valve traps pressure in the line when
the spray gun is closed. Machines with unloader
valves are preset and tested at the factory before
shipping.
Tampering with the factory setting may cause per-
sonal injury and/or property damage and will void
the manufacturer's warranty.
Winterizing Procedure:
Damage due to freezing is not covered by warranty.
Adhere to the following cold weather procedures when-
ever the washer must be stored or operated outdoors
under freezing conditions.
During winter months, when temperatures drop
below 32°F, protecting your machine against freezing is
necessary. Siphoning a small amount of antifreeze into
the system is recommended. This is done by pouring a
50/50 mix of antifreeze and water into the float tank and
then siphoning 100% antifreeze through the detergent
line with the pump on. If compressed air is available,
an air fitting can be screwed into float tank strainer
fitting and, by injecting compressed air, all water will
be blown out of the system.
Low Pressure Diagnosis:
Refer to Troubleshooting Chart for low pressure. If, by
referring to the chart, the trouble is found to be either
the unloader or pump, your next step is to determine
which is the problem. This can be done by eliminat-
ing the unloader from the system and attaching the
discharge hose directly to the pump. If high pressure
is present, then the unloader needs repairing.
CAUTION: When using this procedure to test com-
ponents, keep spray gun open at all times.
Removal of Soot and Heating Coil:
In the heating process, fuel residue in the form of soot
deposits may develop between the heating coil pipe
and block air flow which will affect burner combustion.
When soot has been detected on visual observation,
the soot on the coil must be washed off after following
the coil removal steps which follow.
Coil Removal:
Removal of the coil, because of freeze breakage or
to clean soot from it, can be done quickly and easily.
1. Disconnect hose from pump to inlet side of
the coil.
2. Carefully disconnect thermostat sensor,
making sure you do not crimp capillary tube.
3. Remove all the fittings from the inlet and
discharge side of coil.
4. Remove the burner assembly from the
combustion chamber.
5. Remove the 3-3/8" bolts from each side of coil
and tank assembly (these bolts are used to
fasten tank and handles to chassis).
6. Remove the two bolts which are underneath the
bottom wrap (to keep the coil from moving).
7. Remove tank top wrap exposing insulation
and coil.
8. Bend back insulation tabs.
9. Carefully fold back the insulation and remove
insulation retainer plates and coil.
1 0. Replace or repair any insulation found to
be torn or broken.
1 1. To reinstall new or cleaned coil, reverse
steps 9 through 1.
PREVENTATIVE MAINTENANCE & SERVICE

620-622 • 9.800-187.0 • Rev. 9/10
OPERATOR’S MANUAL PRESSURE WASHER
12
High Limit Hot Water Thermostat:
For safety, each machine is equipped with a high limit
control switch. In the event the temperature of the water
should exceed its operating temperature the high limit
control will turn the burner off until the water cools.
CAUTION: The thermostat uses a capillary tube.
Do not bend or strike with any object.
PREVENTATIVE MAINTENANCE & SERVICE

620-622 • 9.800-187.0 • Rev. 9/10
13
PRESSURE WASHER OPERATOR’S MANUAL
This pressure washer was produced with the best available materials and quality craftsmanship. However, you
as the owner have certain responsibilities for the correct care of the equipment. Attention to regular preventative
maintenance procedures will assist in preserving the performance of your equipment. Contact your dealer for
maintenance. Regular preventative maintenance will add many hours to the life of your pressure washer. Perform
maintenance more often under severe conditions.
OIL CHANGE RECORD
PREVENTATIVE MAINTENANCE
Check pump oil level before first use of your new pressure washer. Change pump oil after first 50 hours and
every 3 months or 500 hours thereafter. Use SAE 30 weight oil, non-detergent.
MAINTENANCE SCHEDULE
Pump Oil Inspect Oil level daily
Change After first 50 hours, then every 500 hours or annually
Check and Tighten Belts Every 3 months
Remove Burner Soot Annually
Burner Adjustment/Cleaning Annually
Replace Burner Nozzle Annually
Descale Coil Annually (More often if required)
Replace High Pressure Nozzle Every 6 months
Replace Quick Couplers Annually
Clean Water Screen/Filter Weekly
Replace HP Hose Annually (If there are any signs of wear)
Grease Motor Every 10,000 hours
Check Fuel Filter Every 3 months
Check Safety Controls Daily
Date Oil Changed
Month/Day/Year
Estimated Operating
Hours Since
Last Oil Change

620-622 • 9.800-187.0 • Rev. 9/10
PRESSURE WASHER Troubleshooting Guide
14
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
LOW OPERATING
PRESSURE
Faulty pressure gauge Test with 2nd gauge. If bad install new gauge.
Insufficient water supply Use larger garden hose; clean water filter at inlet. Clean
screen inside float tank.
Old, worn or incorrect spray nozzle Match nozzle number to machine and/or replace with
new nozzle.
Belt slippage Tighten or replace; use correct belt.
Plumbing or hose leak Check plumbing system for leaks. Retape leaks with
teflon tape.
Faulty or misadjusted unloader valve
(Where applicable)
Adjust unloader for proper pressure. Install repair kit
when needed. Test PSI with unloader removed, taking
pressure directly off the pump.
Worn packing in pump Install new packing kit.
Fouled or dirty inlet or discharge valves
in pump
Clean inlet and discharge valves.
Worn inlet or discharge valves Replace with valve kit.
Low power supply Check voltage of building and compare with require-
ments. Obtain a different power source.
Detergent metering valve left open suck-
ing air, or faulty metering valve
Close and/or replace metering valve.
BURNER WILL
NOT LIGHT
Little or no fuel Fill tank with fuel.
Improper fuel or water in fuel Drain fuel tank and fill with proper fuel.
Plugged fuel filter Replace as needed.
Misadjusted burner air bands Readjust air bands for clean burn.
Little or no fuel pressure from fuel
pump
Increase fuel pressure to specification on fuel pump
and/or replace fuel pump.
Faulty burner transformer Test transformer for proper arc between contacts. Re-
place as needed.
Disconnected or short in electrical wir-
ing
All wire contacts should be clean and tight. No breaks
in wire.
Burner motor thermal protector tripped If tripped, check voltage, connections, and extensions
for cause. Check fuel pump shaft rotation for binding
causing motor to overheat.
Flex-coupling slipping on fuel pump shaft
or burner motor shaft
Replace if needed.
On-Off switch defective Check continuity through burner switch.
Heavy sooting on coil and burner, can
cause interruption of air flow and shorting
of electrodes
Clean as required.
Improper electrode setting Clean and set according to diagram in Operators
Manual.
Fuel not reaching combustion chamber Check fuel pump for proper flow. Check solenoid flow
switch on units with spray gun control, for proper on-off
fuel flow control.
Clogged burner nozzle Replace.
Water not flowing through unloader Open spray gun to allow water to flow.
Flow switch malfunction Remove test for continuity and replace as needed.
Fuel solenoid malfunction Replace if needed.

620-622 • 9.800-187.0 • Rev. 9/10
15
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
MACHINE
SMOKES
Improper fuel or water in fuel Drain tank and replace contaminated fuel.
Improper air adjustment Readjust air bands on burner assembly.
Low fuel pressure Adjust fuel pump pressure to specification on fuel pump.
Air leaks in fuel lines Check fuel lines for leaks or air bubbles. Tighten or replace
as needed.
Plugged or dirty burner nozzle Replace.
Faulty burner nozzle spray pattern Replace nozzle.
Heavy accumulation of soot on coils
and burner assembly
Remove coils and burner assembly. Clean thoroughly.
Misaligned electrode Realign electrodes to specifications.
Obstruction in smoke stack Check for insulation blockage or other foreign objects.
LOW WATER
TEMPERATURE
Improper fuel or water in fuel Drain fuel tank and replace with proper fuel.
Low fuel pressure Increase fuel pressure.
Weak fuel pump Check fuel pump pressure. Replace pump if needed.
Fuel filter partially clogged Replace as needed.
Soot build up on coils Clean coils with soot remover.
Lime build up in coils Clean inside of coils with coil clean.
Improper burner nozzle See parts list.
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm or
hot
Lower incoming water temperature.
Fuel pump pressure too high See specifications on fuel pump for proper fuel pres-
sure.
Fuel pump defective Replace fuel pump.
Detergent line sucking air Tighten all clamps. Check detergent line for holes.
Defective high limit switch Replace.
Incorrect fuel nozzle size See specifications for proper size.
Insufficient water supplied Check G.P.M. to machine.
Restricted water flow Check nozzle for obstruction, proper size.
PUMP MOTOR
STOPS AFTER A
FEW MINUTES
OF OPERATION,
OR STARTS
SLOW
Insufficient voltage Use heavier drop cord and check voltage at receptacle.
Check name plate for amperage draw.
Plugged nozzle Remove and clean nozzle. Turn on water pump and flush
lines, replace nozzle.
Wrong spray nozzle See serial plate for minimum nozzle size.
Automatic overload switch tripped Allow motor to cool - switch will automatically reset.
Motor wet Allow to dry.
Short in electrical wiring Wire contacts should be clean and tight. No breaks in
wires.
Coil liming up causing excessive
pressure
See section on Preventative Maintenance.
Water pump low or out of oil causing
pump to bind up
Fill to correct level.

620-622 • 9.800-187.0 • Rev. 9/10
PRESSURE WASHER Troubleshooting Guide
16
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
RELIEF VALVE
LEAKS OR
SPRAYS OUT
WATER
Spray nozzle plugged Remove nozzle and clean out obstruction.
Misadjusted or defective relief valve Adjust or replace as needed.
Scale or dirt plugging inside of coils “See “”Preventative Maintenance Cleaning of
Coil””.”
DETERGENT NOT
DRAWING
Air leak Tighten all clamps. Check detergent lines for holes.
Detergent metering valve packing not
tight or packing worn
Tighten nut. Replace valve or packing.
Filter screen on detergent suction hose
plugged
Clean or replace.
Dried up detergent plugging metering
valve or injector
Clean and flush.
Restrictor in float tank missing Install restrictor.
High viscosity of detergent Dilute detergent to specifications.
MACHINE WILL
NOT DRAW UP
DETERGENT
Clamps holding detergent lines are loose Tighten clamps.
Hole in detergent line(s) Repair hole.
Strainer basket plugged Remove and clean.
BURNER MOTOR
WILL NOT RUN
Overload protector tripped Push reset button.
Fuel pump seized Replace fuel pump.
Burner fan loose of misaligned Position correctly, tighten set screw.
Defective control switch Replace switch.
Loose wire Check and replace or tighten wiring.
Defective burner motor Replace motor.
EXCESSIVE
VIBRATION IN
DELIVERY LINE
Irregular function of check valves, meter-
ing valves
Check and replace if necessary.
TEMPERATURE
RELIEF VALVE
LEAKS WATER
(PUMP
PROTECTOR)
Spray gun in OFF position with machine
operating for an extended period of time
Open spray gun to cool circulating water.
Relief valve defective Replace valve.
Particle between valve and seat Remove internal parts and clean.
BURNER STAYS
ON WHEN SPRAY
GUN IS IN OFF
POSITION
Fuel pump pressure too high Lower fuel pressure to specifications.
Flow switch malfunction Test for continuity and replace as needed.
Fuel solenoid defective Replace fuel solenoid.
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
Pump sucking air Check water supply and possibility of air seepage.
Valves sticking Check and clean or replace if necessary.
Unloader valve seat faulty Check and replace if necessary.
Nozzle incorrectly sized See serial plate for minimum nozzle size.
Worn piston packing Check and replace if necessary.

620-622 • 9.800-187.0 • Rev. 9/10
17
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
PUMP NOISY Air in suction line Check water supply and connections on suction line.
Broken or weak inlet or discharge
valve springs
Check and replace if necessary.
Excessive temperature of liquid Reduce to below 60°C (140°F).
Foreign matter in valves Check and clean if necessary.
Worn bearings Check and replace if necessary.
PRESENCE OF
WATER IN OIL
Oil seal worn Check and replace if necessary.
High humidity in air Check and change oil twice as often.
Piston packing worn Check and replace if necessary.
WATER DRIPPING
FROM UNDER PUMP
Piston packing worn Check and replace if necessary.
O.R. Plunger retainer worn Check and replace if necessary.
Cracked ceramics Check and replace if necessary.
OIL DRIPPING Oil seal worn Check and replace if necessary.
Cracked manifold Check and replace if necessary.

620-622 • 9.800-187.0 • Rev. 9/10
PRESSURE WASHER Troubleshooting Guide
18
For
Detail See
Float Tank
Illus.
For
Detail See
Control
Panel
Illus.
50
66, 67
78 79
77
49
42
43
61
68
63
1
6
41
64
60
39
40
5
Thermostat
(Enlarged View)
Line to
Pump
84
78
85
87 86
13
71 72
69
82
81
77
80
Line to
Pump
Line to Detergent
Supply
8
65
76
3
4
88
71
72
58
EXPLODED VIEW - LEFT SIDE
96

620-622 • 9.800-187.0 • Rev. 9/10
19
PRESSURE WASHER OPERATOR’S MANUAL
98001870-2
Steam
Option
47
17
3
75
22
32
70, 71
26
54
28
45
48
47
12
10
2
20
9
16
33
19
18
24
21
22
23
27
29
14
46
36
37
38
30
15
7
13
13
25
62
13
90
83
72
71
35
91 92
90
For
Detail
See Pump
Illus.
Line
from
Float
Tank
55
56
57
47
59
46
52
53
47
66
4
4
To
Detergent
Pump
89
93
22
95
44
94
51
EXPLODED VIEW - RIGHT SIDE
74
73
79

620-622 • 9.800-187.0 • Rev. 9/10
OPERATOR’S MANUAL PRESSURE WASHER
20
ITEM PART NO. DESCRIPTION QTY
1 9.803-002.0 Face Plate, Belt Guard 1
2 9.802-872.0 Tab, Belt Guard Mount 3
3 9.802-794.0 Nut, Cage, 1/4" x 12
Gauge 14
4 9.802-753.0 Screw, 1/4" x 3/4" HH NC,
Whiz Loc 6
5 9.803-015.0 Belt Guard, Short, No
Relief 1
6 9.802-746.0 Thumb Screw,
1/4"-20 x 1/2" 4
7 Burner Assembly, See Burner Specifications
Page 28
8 9.804-0030.0 Screw, 1/4" x 3/4", BHSCS 4
9 9.802-138.0 Hose Barb, 1/4" BRB x 1/4"
MNPT 1
10 9.802-143.0 Hose Barb, 1/4" BRB x 1/4"
MNPT, 90° 1
11 9.802-519.0  Strain Relief 1
12 9.802-108.0 Nipple, 1/4” Hex 1
13 6.390-126.0 Clamp, Hose, .46 - .54 9
14 8.725-306.0 Filter, Fuel, Oil H20 1
15 9.803-014.0 Coil, Rodless 1
16 9.803-006.0 Weldment, Bottom Wrap,
SS, Super Skid 1
17 9.802-013.0 Nipple, 1/2" x 2-1/2",
Galvanized, Sch 80 1
18 9.802-015.0 Nipple, 1/2" x 4", Galvanized,
Sch 80 1
19 8.706-141.0 Coupling 1
20 9.802-032.0 Tee, 1/2", Female, Steel
Pipe 1
21 9.802-040.0 Elbow, 1/2" JIC, 1/2", 90°,
P/ TF5405-8-8 1
22 8.902-433.0 Valve, Safety Relief 1
23 9.802-171.0 Nipple, 3/8" x 3/8" NPT ST
Male 1
24 9.802-191.0 Valve, Safety Relief, 5000
PSI 1
25 8.706-207.0 Elbow, 3/8" Street 1
26 9.802-883.0 Insulation, Front Head, No
Hole 1
27 9.802-894.0 Insulation, Burner Head,
w/ Hole 1
28 9.802-896.0 Insulation, Blanket-No Foil,
24" x 57" 1
29 9.802-653.0 Gasket, Burner Flange 2
30 9.802-902.0 Insulation/Blanket-Die Cut
28" x 24" 1
31 9.802-727.0  Bolt, 3/8" x 1-3/4" Tap 2
32 9.802-781.0 Nut, 3/8", Flange, Whiz Loc,
NC 5
EXPLODED VIEW PARTS LIST
ITEM PART NO. DESCRIPTION QTY
33 8.711-785.0 Hose, 3/8" Push-On 24"
34 9.802-797.0  Screw, SS #10 x 1/2"
Hex Head Tek 8
35 8.706-248.0 Plug 3/8 1
36 9.149-003.0 Discharge Manifold 1
37 9.803-132.0 Insulation Retainer Plate 2
38 9.803-005.0 Top Wrap, SS 1
39 9.802-998.0 Weldment, Frame, Super
Skid 1
40 9.802-080.0 Tank, Fuel, 8 Gallon, Black 1
41 9.802-053.0 Bushing, Rubber Nitrile 2
42 9.802-056.0 Diptube Assy, Plastic 10.75"
Long 1
43 9.802-054.0 Elbow, Fuel Tank Zinc 1
44 9.802-459.0 Switch, MV60 (Steam
Option) 1
45 9.804-045.0 Motor, 10 HP/1PH/230V
(620.0) 1
9.802-335.0 Motor, 10 HP/3PH/230V,
460V (621.0, 622.0) 1
46 9.802-720.0 Bolt, 3/8" x 1", NC HH 7
47 9.802-807.0 Washer, 3/8", SAE Flat 12
48 9.802-779.0 Nut, 3/8", SAE Flat 4
49 9.802-383.0 Pulley, Motor, 2BK36H 1
50 9.802-401.0 Bushing, Motor, H x 1-3/8" 1
51 9.196-012.0 Screw, 10-24" x 1/4" 1
52 9.802-099.0 Washer, Snubbing 3
53 9.802-814.0 Washer, 3/8", Lock, Split
Ring 3
54 9.803-009.0 Bracket, Belt Tension 1
55 9.802-710.0 Bolt, 5/16" x 1", NC HH 2
56 9.802-776.0 Nut, 5/16", ESNA, NC 2
57 9.802-733.0 Bolt, 3/8" x 3-1/2", Tap 1
58 9.802-754.0 Bolt, 1/4-20 x 1/2" Hex 4
59 9.802-789.0 Nut, 3/8" HEX, NC 2
60 9.804-060.0 Pulley, Pump, 2BK65H 1
61 9.802-403.0 Bushing, Pump, HX 25mm 1
62 9.802-254.0 Hose, 1/4", Push-On,
Fuel Line, 60" 2
63 9.802-418.0 Belt, BX39 1
64 9.804-056.0 Panel, Control 1
65 9.802-799.0 Screw, #14 x 1", Tek, Blk,
Zinc 13
66 8.750-094.0 Thermostat, Adjustable,
302°F 1
67 9.802-447.0  Conduit, Corrugated
Tubing, 1/4", 100 ft. Roll 40"
68 9.804-044.0 Valve, Metering, 1/4" Hose 1
69 9.800-185.0 Label, Operating Inst 1