9.803-436.0-F09/14/23
OPERATOR MANUAL
To locate your local Kärcher Commercial Pressure Washer Dealer nearest you
visit www.karchercommercial.us
MODEL # ORDER #
HDS 5.6/35 De Cage 1.110-622.0
HDS 5.6/35 De Cage 1.110-623.0
98034360-1
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Temperature
When the light is on, it means the engine is overheating.
Turn machine off and perform maintenance.
Glow Plug
When the light is on the engine is being pre-heated.
When the light turns off the engine can be started.
Low Oil
When the light is on, it means check the oil level.
Add oil if needed.
Battery is Not Charging
When the light is on, it means check battery and/or
charging system.
IDENTIFICATION OF OPERATIONAL LABEL SYMBOLS
1.575-609.0 SPECIFICATIONS
• Pump Volume at Pump Head: 5.2 GPM
• Pump Pressure at Pump Head: 3500 PSI
• Burner BTU's: 432,173
• Engine: Kubota D1105
• Burner Voltage: 12V DC
1.575-610.0 SPECIFICATIONS
• Pump Volume at Pump Head: 5.2 GPM
• Pump Pressure at Pump Head: 3500 PSI
• Burner BTU's: 456,365
• Engine: Kubota D1105
• Burner Voltage: 120V AC
3
CONTENTS
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.
9.803-436.0-F • Operator Kärcher HDS Diesel
Introduction & Important Safety Information 4-6
Component Identifi cation 7
Assembly Instruction 8
Operating Instructions 9
Detergents & Cleaning Tips 10
Shut Down & Clean-Up 11
Storage 11
Maintenance 12
Troubleshooting 13-16
Preventative Maintenance & Oil Change Chart 17
9.803-436.0-F • Operator Kärcher HDS Diesel
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 fl uent 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.
SAVE THESE 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 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.
KEEP WATER
SPRAY AWAY FROM
ELECTRICAL WIRING.
DANGER: Keep wand, hose, and
water spray away from electric
wiring or fatal electric shock may
result.
4. All installations must comply
with local codes. Contact
your electrician, plumber,
utility company or the selling
distributor for specifi c details.
WARNING
EAR PROTECTION
MUST BE WORN
WARNING: This machine ex-
ceeds 85 db appropriate ear
protection must be worn.
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 fl y at high speeds. To avoid
personal injury, eye, hand and
foot safety devices must be
worn.
5. Eye, hand, and foot protection
must be worn when using this
equipment.
6. Keep operating area clear of all persons.
RISK OF EXPLOSION:
OPERATE ONLY
W
HERE 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 fl ame
or torch is permitted.
RISK OF FIRE.
DO NOT ADD FUEL
WHEN OPERATING
MACHINE.
WARNING
WARNING: Risk of fi re — Do not
add fuel when the product is
operating or still hot.
WARNING: Do not use gaso-
line crankcase draining or oil
containing gasoline, solvents
or alcohol. Doing so will re-
sult in fire and/or explosion.
WARNING: Risk of fi re — Do not spray fl ammable
liquids.
7. Allow engine to cool for 1-2 minutes before refuel-
ing. If any fuel is spilled, make sure the area is dry
before testing the spark plug or starting the engine.
(Fire and/or explosion may occur if this is not done.)
Gasoline engines on mobile or portable equipment
shall be refueled:
a. outdoors;
b. with the engine on the equipment stopped;
c. with no source of ignition within 10 feet of
the dispensing point; and
d. with an allowance made for expansion of the
fuel should the equipment be exposed to a
higher ambient temperature.
DANGER
9.803-436.0-F • Operator Kärcher HDS Diesel
5
PRESSURE WASHER
OPERATOR’S MANUAL
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 specifi ed 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, scaff olding
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 allow acids, caustic or abrasive fl uids to
pass through the pump.
21. Never run pump dry or leave spray gun closed
longer than 1-2 minutes.
22. Machines with shut-off spray gun should not be
operated with the spray gun in the off position for
IMPORTANT SAFETY INFORMATION
In an overfi lling situation, additional precautions are
necessary to ensure that the situation is handled
in a safe manner.
WARNING: Risk of injury. Disconnect battery
ground terminal before servicing.
8. When in use , do not place machine near fl ammable
objects as the engine is hot.
9. Oil burning appliances shall be installed only in
locations where combustible dusts and fl ammable
gases or vapors are not present. Do not store or
use gasoline near this machine.
10. Use No. 1 or No. 2 heating oil (ASTM D306) only.
NEVER use gasoline in your fuel oil tank. Gasoline
is more combustible than fuel oil and could result
in a serious explosion. NEVER use crankcase or
waste oil in your burner. Fuel unit malfunction could
result from contamination.
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.
11. Transport/repair with fuel tank EMPTY or with fuel
shut-off valve OFF.
HOT DISCHARGE FLUID:
DO NOT TOUCH OR
DIRECT DISCHARGE
STREAM AT PERSONS
OR ANIMALS.
CAUTION: Hot discharge fl uid.
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.
12 To reduce the risk of injury, close supervision is nec-
essary 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 operation.
14. Be certain all quick coupler fi ttings are secured
before using pressure washer.
9.803-436.0-F • Operator Kärcher HDS Diesel
OPERATOR’S MANUAL
PRESSURE WASHER
6
extensive periods of time as this may cause dam-
age to the pump.
23. Protect discharge hose from vehicle traffi c and
sharp objects. Inspect condition of high pressure
hose before using or bodily injury may result.
24. Before disconnecting discharge hose from water
outlet, turn burner off and open spray gun to al-
low water to cool below 100° before stopping the
machine. Then open the spray gun to relieve pres-
sure. Failure to properly cool down or maintain the
heating coil may result in a steam explosion.
25. Do not overreach or stand on unstable support.
Keep good footing and balance at all times.
26. Do not operate this machine when fatigued or under
the infl uence of alcohol, prescription medications,
or drugs.
Follow the maintenance instructions speci-
fi ed in the manual.
IMPORTANT SAFETY INFORMATION
9.803-436.0-F • Operator Kärcher HDS Diesel
7
PRESSURE WASHER
OPERATOR’S MANUAL
98034360-2
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COMPONENT IDENTIFICATION
Pump — Develops high pressure by pumping water
volume through nozzle.
Spray Gun — Controls the application of water and
detergent onto cleaning surface with trigger device.
Includes safety latch.
Detergent Metering Valve — Controls detergent mix-
ture.
Wand — Must be connected to the spray gun.
Rupture Disk — Will burst when extreme pressure limits
are reached.
Pressure Switch — Activates fuel solenoid to turn off
burner when trigger on spray gun is released.
Unloader Valve — Safety control which releases pres-
sure when spray gun trigger is released.
High Pressure Hose — Connect one end to water pump
discharge nipple and the other end to spray gun.
Pressure Nozzle — Inserted into wand quick coupler
to develop pressure
Adjustable Thermostat — Prevents water temperature
from exceeding high temperatures. Is not used to main-
tain constant temperature setting.
High
Pressure
Hose
Wand
Spray
Gun
Trigger
Detergent Bucket
(not included)
Diesel Fuel
Tank
Water
Supply Hose
(not included)
Flue Adapter
Optional 7-10049
Insulation Gasket
Optional 7-01471
Burner
Switch
Pressure Nozzle
Adjustable
Thermostat
Detergent
Pick-up Hose
Inlet Connection
Detergent
Metering
Valve
NOTE: Burner air adjustment
must be tested after installation.
Pump
Rupture
Disk
Unloader
Valve
Pressure
Switch
Safety Latch
9.803-436.0-F • Operator Kärcher HDS Diesel
OPERATOR’S MANUAL
PRESSURE WASHER
8
98034360-8
98034360-6
98034360-5
98034360-4
98034360-3
ASSEMBLY INSTRUCTIONS
STEP 1: Attach the high pressure
hose to the spray gun using teflon
tape on hose threads.
STEP 3: Remove shipping cap, if
equipped, and install oil dipstick.
Check pump oil level by using
dipstick or observe oil level in oil
window (if equipped). Use 10W-40
or 30W non detergent oil.
STEP 6: Connect the garden hose
to pump water inlet. Inspect inlets.
CAUTION: Do not run the pump
without water or pump damage
will result.
STEP 2: Pull the spring-loaded col-
lar of the wand coupler back to insert
your choice of pressure nozzle.
Safety
Latch
Spray
Gun
High Pressure
Hose
Wand
Pressure
Nozzle
Dipstick
Water
Inlet
Pump
Discharge
Fitting
STEP 4: Connect the high pressure
hose to the pump discharge tting.
Push coupler collar forward until
secure.
STEP 5: Connect garden hose to
cold water source and turn water on
completely. Never use hot water.
Garden
Hose
98034360-7
9.803-436.0-F • Operator Kärcher HDS Diesel
9
PRESSURE WASHER
OPERATOR’S MANUAL
98034360-10
OPERATING INSTRUCTIONS
98034360-9
STEP 1: Read operator's manual before operating machine. Check engine
oil level. Oil level should be level with the bottom of the oil ller neck. (Refer
to the engine’s operating manual included with machine.) We recommend
that the oil be changed after the first 50 hours of use, then once every
200 hours. NOTE: Improper oil levels will cause low oil sensor to shut o
engine. IMPORTANT! Do not run engine with high or low oil levels
as this will cause engine damage.
STEP 2: Fill engine/burner fuel tank
with No. 2 diesel fuel. Check engine
and pump oil levels. Check engine
radiator uid level. Install proper bat-
tery making sure that the red cable
is attatched to the positive terminal.
Use a 12V group 24 style battery.
Oil Dipstick
Fuel
Tank
STEP 3: Read engine manual. The
keyed ignition is located on engine
control panel. Turn key to rst posi-
tion. The glow plug light will illumi-
nate. When light goes out, turn key
to start (second) position. Do not
hold key in start position longer than
ve (5) seconds or starter motor will
be damaged.
STEP 4: Before installing pres-
sure nozzle, trigger spray gun to
eliminate trapped pressure. Then
run machine allowing water to ush
through the system until clear.
STEP 5: With spray gun and wand
pointed away from you or anybody
else, insert pressure nozzle into
quick coupler on end of wand. Press
trigger on spray gun to obtain pres-
surized cold water spray.
WARNING! Never replace noz-
zles without engaging the safety
latch on the spray gun trigger.
Oil Cap Filter
98034360-12
STEP 6: For hot water, turn burner
switch to ON when a steady stream
of water flows out of spray gun.
Burner will light automatically.
NOTE: Do not start machine with
burner switch on.
STEP 7:
Turn thermostat above 180°
mark. Thermostats are high limit
devices not temperature regulators.
STEP 8: To apply detergent, place
detergent pick-up tube into a con-
tainer of detergent and turn the
detergent valve counterclockwise.
STEP 9: To stop, reverse steps
and set all controls to their original
settings.
Turn burner switch OFF and open
trigger on spray gun, allowing water
to cool.
98034360-13
Safety
Latch
Trigger
OP
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98034360-11
Key
Switch
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98034360-14
Burner
Switch
Thermostat
98034360-15
Detergent
Valve
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98034360-16
Burner
Switch
9.803-436.0-F • Operator Kärcher HDS Diesel
OPERATOR’S MANUAL
PRESSURE WASHER
10
98034360-17
WARNING: Some detergents
may be harmful if inhaled or in-
gested, causing severe nausea,
fainting or poisoning. The harm-
ful elements may cause property
damage or severe injury.
STEP 1: Use detergent designed
specifically for pressure washers.
Household detergents could dam-
age the pump. Prepare detergent
solution as required by the manu-
facturer. Fill a container with pres-
sure washer detergent. Place the
lter end of detergent suction tube
into the detergent container.
STEP 2: Open detergent valve to desired mixture ratio
by turning detergent knob.
STEP 3: With the engine running,
pull trigger to operate machine.
Liquid detergent is drawn into the
machine and mixed with water.
Apply detergent to work area.
Do not allow detergent to dry on
surface.
IMPORTANT: You must flush the
detergent line after each use by placing the suction
tube into a bucket of clean water, then run the pres-
sure washer for 1-2 minutes.
THERMAL PUMP PROTECTION
If you run the engine on your pressure washer for 3-5
minutes without pressing the trigger on the spray gun,
circulating water in the pump can reach high tempera-
tures. When the water reaches this temperature, the
pump protector engages and cools the pump by dis-
charging the warm water onto the ground. This thermal
device prevents internal damage to the pump.
CLEANING TIPS
Pre-rinse cleaning surface with fresh water. Place de-
tergent suction tube directly into cleaning solution and
apply to surface (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 deter-
gent 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 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 thinner,
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.
RINSING
It will take a few seconds for the detergent to clear.
Apply safety latch to spray gun. Open detergent valve.
Select and install the desired high pressure nozzle.
NOTE: You can also stop detergent from flowing by
simply removing detergent siphon tube from bottle.
WARNING
98034360-19
DETERGENTS & GENERAL CLEANING TECHNIQUES
Detergent
Valve
98034360-18
Detergent
Knob
9.803-436.0-F • Operator Kärcher HDS Diesel
11
PRESSURE WASHER
OPERATOR’S MANUAL
OP
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98034360-21
98034310-26
98034360-20
SHUTTING DOWN AND CLEAN-UP
98034360-22
STEP 1: Remove detergent suction
tube from container and insert into
one gallon of fresh water. Open
detergent mixing valve. Pull trigger
on spray gun and siphon water for
one minute.
STEP 2: Turn burner switch off and
continue spraying, allowing water to
cool below 100°F.
To stop engine, turn key to off
position.
STEP 3: Turn o water supply.
STEP 5: Disconnect the garden
hose from the water inlet on the
machine.
STEP 6: Disconnect the high
pressure hose from high pres-
sure outlet. Protect from freezing.
STEP 7: Engage
the spray gun
safety lock.
STEP 4: Press trig-
ger to release wa-
ter pressure.
STORAGE
On-O
Key Switch
Safety
Latch
Measures should be taken to protect your FOCS series
engine if the engine is not operated for a period of 30
days or more. Proper storage will protect the engine
from corrosion and prevent costly repairs due to storage
induced problems.
Storage - 1 to 6 months
1. Start and idle the engine at a no-load condition for
15 minutes.
2. Stop the engine, allow the engine to cool enough
to safely drain the oil as shown Re-install the oil
drain plug, then ll the crankcase with MIL-L-644-
P9 protectant oil. Fill the fuel tank with a high grade
fuel preservative (add mix) such as STA-BIL per the
manufacturer recommendations.
3. Start and operate the engine at 3/4 speed for 5-10
minutes.
4. Stop the engine, allow to cool enough to safely
drain the engine oil as shown. Re-install the oil
drain plug.
5. Refill the engine with standard recommended lu-
bricating oil.
6. Drain the fuel tank. Remove the fuel lter. Install a
new fuel lter.
7. Carefully clean all debris from the radiator ns.
8. Remove the intake manifold. Rotate the engine
until the intake valve opens at each cylinder. Using
suitable means, pour approximately 1 tsp. of engine
oil into each cylinder. Rotate the engine several
revolutions. Spray the inside of the intake manifold
with SAE 10 W oil. Replace the intake manifold
using a new gasket.
9. Spray the inside of the exhaust manifold with SAE
10W oil.
10. Cover all openings with tape and apply grease to
any and all unpainted surfaces.
11. Loosen the fan belt before wrapping the engine in
plastic film and storing in a dry place away from
high voltage sources and o the ground.
Storage - In excess of 6 months
Perform the storage preparation procedures approxi-
mately as detailed, except with the following changes.
1. Replace the oil in step 2 above with MIL-L-21260,
grade 2, SAE 30W rustproof oil.
2. Delete steps 5 and 11 above.
3. Coat any and all unpainted surfaces with MIL-C
16173D, grade 3 anti-rust grease.
4. Replace anti-freeze every 2 years.
98034360-23
98034360-24
Water
Inlet
Garden
Inlet
98034360-25
High
Pressure
Outlet
Burner
Switch
9.803-436.0-F • Operator Kärcher HDS Diesel
OPERATOR’S MANUAL
PRESSURE WASHER
12
MAINTENANCE
PREVENTATIVE MAINTENANCE
1. Check to see that water pump is properly lubri-
cated.
2. Follow winterizing instructions to prevent freeze
damage to pump and coils.
3. Always neutralize and ush detergent from system
after use.
4. If water is known to have high mineral content, use
a water softener in your water system, or de-scale
as needed.
5. Do not allow acidic, caustic or abrasive uids to be
pumped through system.
6. Always use high grade quality cleaning products.
7. Never run pump dry for extended periods of time.
8. Use clean No. 2 diesel fuel. Clean or replace fuel
lter every 250 hours of operation. Avoid water con-
taminated fuel as it will damage the fuel pump.
9. If machine is operated with smoky or eye burning
exhaust, coils will soot up. Adjust air bands and fuel
pressure for proper emission.
10. Never allow water to be sprayed on or near the
engine or burner assembly or any electrical com-
ponent.
11. Periodically delime coils as per instructions.
12. Check to see that engine is properly lubricated. Use
SAE 10W40 grade oil.
It is advisable, periodically, to visually inspect the
burner. Check air inlet to make sure it is not clogged
or blocked. Wipe o any oil spills and keep equipment
clean and dry.
The ow of combustion and ventilating air to the burner
must not be blocked or obstructed in any manner.
The area around the washer should be kept clean and
free of combustible materials, gasoline and other am-
mable vapors and liquids.
MAINTENANCE AND SERVICE
Unloader Valves:
Unloader valves are preset and tested at the factory
before shipping. Occasional adjustment of the unloader
may be necessary to maintain correct pressure.
Adjusting Unloader Valves:
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. Ad-
here to the following cold weather procedures whenever
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 neces-
sary. Store the machine in a heated room. If this is not
possible then mix a 50/50 solution of anti-freeze and
water in the oat tank. Turn the engine on to siphon the
anti-freeze mixture through the machine. If compressed
air is available, an air fitting can be screwed into the
oat tank by removing the oat tank strainer and tting.
Then inject the compressed air. Water will be blown
out of the machine when the trigger on the spray gun
is opened.
High Limit Hot Water Thermostat:
For safety, each machine is equipped with a tempera-
ture sensitive high limit control switch. In the event that
the water should exceed its operating temperature,
the high limit control will turn the burner o until the
water cools, then it will automatically reset itself. The
thermostat sensor is located on the discharge side of
the heating coil. The thermostat control dial is located
on the control panel.
Pumps:
Use only SAE 10W-40 or 30W non-detergent oil.
Change oil after rst 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 the red dot visible through the oil gauge
window. Oil should be maintained at that level.
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.
The Rupture Disk should be replaced every two years.
9.803-436.0-F • Operator Kärcher HDS Diesel
13
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
LOW OPERATING
PRESSURE
Faulty pressure gauge Install new gauge.
Insu cient water supply Use larger supply hose; clean lter at water
inlet.
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 te on tape.
Faulty or misadjusted unloader
valve
Adjust unloader for proper pressure. Install
repair kit when needed.
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.
Obstruction in spray nozzle Remove obstruction.
Leaking pressure control valve Rebuild or replace as needed.
Slow engine RPM Set engine speed at proper speci cations.
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.
BURNER WILL
NOT LIGHT
Little or no fuel Fill tank with fuel.
Improper fuel or water in fuel Drain fuel tank and ll with proper fuel.
Clogged fuel line Clean or replace.
Plugged fuel lter 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 speci cation and/or
replace fuel pump. Test with pressure gauge.
Faulty burner transformer Test transformer for proper arc between
contacts. Replace as needed.
(continued on next
page)
Disconnected or short in electrical
wiring
All wire contacts should be clean and tight.
No breaks in wire.
9.803-436.0-F • Operator Kärcher HDS Diesel
PRESSURE WASHER Troubleshooting Guide
14
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
BURNER WILL
NOT LIGHT
(continued from
previous page)
Flex coupling slipping on fuel
pump shaft or burner motor shaft
Replace if needed.
On-O switch defective Check for electrical current reaching burner
assembly with burner switch on.
Heavy sooting on coil and burner
can cause interruption of air ow
and shorting of electrodes
Clean as required.
Improper electrode setting Check and reset according to diagram in
Operator’s Manual.
Fuel not reaching combustion
chamber
Check fuel pump for proper ow. Check solenoid
ow switch on machines with spray gun control,
for proper on-o fuel ow control.
Clogged burner nozzle Clean as required.
Thermostat faulty or slow engine
speed
Increase engine RPM to increase voltage.
Flow switch malfunction Remove, test for continuity and replace as needed.
Flow solenoid malfunction Replace if needed.
FLUCTUATING
PRESSURE
Valves worn Check and replace if necessary.
Blockage in valve Check and replace if necessary.
Pump sucking air Check water supply and air seepage at joints in
suction line.
Worn piston packing Check and replace if necessary.
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 speci cations.
Plugged or dirty burner nozzle Replace nozzle.
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 setting Realign electrodes to speci cations.
Obstruction in smoke stack Check for insulation blockage or other foreign
objects.
Low engine RPM Increase RPM.
9.803-436.0-F • Operator Kärcher HDS Diesel
15
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
LOW WATER
TEMPERATURE
Improper fuel or water in fuel Replace with clean and proper fuel.
Low fuel pressure Increase fuel pressure.
Weak fuel pump Check fuel pump pressure. Replace pump if
needed.
Fuel lter partially clogged Replace as needed.
Soot build-up on coils not allowing
heat transfer
Clean coils.
Improper burner nozzle Call Dealer.
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm or
hot
Lower incoming water temperature.
Fuel pump pressure too high See speci cations for proper fuel pressure.
Fuel pump defective Replace fuel pump.
Detergent line sucking air Tighten all clamps. Check detergent lines for
holes.
Defective temperature switch Replace.
Incorrect fuel nozzle size Call Dealer.
Insu cient water supplied Check water G.P.M. to machine.
Restricted water ow Check nozzle for obstruction, proper size.
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 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.
WATER DRIPPING
FROM UNDER
PUMP
Piston packing worn Check and replace if necessary.
O-Ring plunger retainer worn Check and replace if necessary.
Cracked piston Check and replace if necessary.
Pump protector Lower water supply pressure. Do not run with
spray gun closed longer than 2 minutes.
9.803-436.0-F • Operator Kärcher HDS Diesel
PRESSURE WASHER Troubleshooting Guide
16
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
OIL DRIPPING
Oil seal worn Check and replace if necessary.
EXCESSIVE
VIBRATION IN
DELIVERY LINE
Irregular functioning of the valves Check and replace if necessary.
DETERGENT
NOT DRAWING
Air leak Tighten all clamps. Check detergent lines for
holes.
Restrictor in oat tank is missing Replace restrictor. Check for proper ori ce in
restrictor.
Filter screen on detergent suction
hose plugged
Clean or replace.
Dried up detergent plugging
metering valve
Disassemble and clean thoroughly.
High viscosity of detergent Dilute detergent to speci cations.
Hole in detergent line(s) Repair hole.
Low detergent level Add detergent, if needed.
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
ON INSTALLATION
Pump sucking air Check water supply and possibility of air seep-
age.
Valves sticking Check and clean or replace if necessary.
Nozzle incorrectly sized Check and replace if necessary (See serial
plate for proper size).
Unloader valve seat faulty Check and replace if necessary.
Worn piston packing Check and replace if necessary.
BURNER
MOTOR WILL
NOT RUN
Fuel pump seized Replace fuel pump.
Burner fan loose or misaligned Position correctly, tighten set screw.
Defective control switch Replace switch.
Loose wire Check and replace or tighten wiring.
Defective burner motor Replace motor.
RELIEF VALVE
LEAKS WATER
Relief valve defective Replace or repair.
9.803-436.0-F • Operator Kärcher HDS Diesel
17
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 preventa-
tive 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.
Check pump oil level before rst use of your new pressure washer. Change pump oil after rst 50 hours and
every 3 months or 500 hours thereafter. Use non-detergent SAE 10W-40 or 30W oil.
PREVENTATIVE MAINTENANCE
MAINTENANCE
Date Oil Changed
Month/Day/Year
No. of Operating Hours
Since Last Oil Change
Brand Name and
Type of Oil (see above)
Maintenance Operation
Every 8 Hrs
or Daily
25 Hrs or
Weekly
100 Hrs or
Yearly
200 Hrs or
Monthly Yearly
Check Oil Pump
x
Engine
x
Change Oil Pump
x
Engine
x
Air Cleaner X
Belt Tension
x
Check Valve Clearance
x
Fuel Tank Filter
x
Water Filter/Clean Check
x
Rupture Disk
Replace every 2 years
OIL CHANGE RECORD
NOTE: Follow Kubota engine manual recommendations in manual provided.
Change engine oil after rst 50 hours and then every 200 hours thereafter.
Form #9.803-436.0 • Printed in U.S.A.
