Kärcher Trailer HDS Series User manual

9.807-942-0-C 04/14/23
Trailer HDS Series
Hot Water - Diesel Heated
Operator’s Manual
MODELS: HDS 3.5/40 GE MT
1.103-844.0
HDS 3.5/4.0 Ge VMT
1.110-118.0
To locate your local Kärcher Commercial
Pressure Washer Dealer nearest you, visit
www.karchercommercial.com

2
Model Number: _____________________________________________
Serial Number: ______________________________________________
Date of Purchase: ____________________________________________
The model and serial numbers will be found on a decal attached to the
pressure washer. Record both serial number and date of purchase.
PATENT PENDING
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
Machine Data Label
Introduction
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 comprehends its contents. Owner and/or user must
study and maintain for future reference the manufacturers’ 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.
Notice
This trailer is equipped to meet applicable U.S. Federal safety standards. Check local and state
requirements regarding brakes and any additional equipment that may be required. Any modifications
or additions including load equalizing hitches, without written factory consent: usage in an
abnormal manner including overloading voids all manufacturers’ warranties and liability.
WARNING: This Owner's Manual contains safety information and instructions for your trailer. You
must read this manual before loading or towing your trailer.
You must follow all safety precautions and instructions.
AVERTISSEMENT: Ce manuel de l'utilisateur contient des informations en matière de sécurité et des
instructions pour la remorque. Lire le présent manuel avant de charger ou de remorquer la remorque.
Suivre toutes les précautions de sécurité et les directives.

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Table of Contents
Machine Data Label . . . . . . . . . . . . . . . . . . . . . . . . . .2
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety
Important Safety Information. . . . . . . . . . . . . . . . . . . 4
Important Trailer Safety Information . . . . . . . . . . . . 7
Tire Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Maintaining Proper Tire Pressure . . . . . . . . . . . . . . . 8
Never Tow the Trailer Before Checking . . . . . . . . . .8
Tow Vehicles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Safety Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Load-Carrying Capacity . . . . . . . . . . . . . . . . . . . . . 10
Tongue Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Caster Operations. . . . . . . . . . . . . . . . . . . . . . . . . . 12
Trailer Brake Operations. . . . . . . . . . . . . . . . . . . . . 13
What to Check And How To Check . . . . . . . . . . . .14
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wheel Lugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Ball Coupler Hitches . . . . . . . . . . . . . . . . . . . . . . . .14
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operations
Trailer Component Identification . . . . . . . . . . . . . . . 15
Accessory Assembly Instructions . . . . . . . . . . . . . . 16
Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . .17
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Operating Instructions. . . . . . . . . . . . . . . . . . . . . . .19
Detergents & General
Operating Techniques. . . . . . . . . . . . . . . . . . . . . 20
Shutting Down And
Clean-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Maintenance
Preventative Maintenance . . . . . . . . . . . . . . . . . . . 23
Maintenance And Service . . . . . . . . . . . . . . . . . . . .23
Unloader Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Winterizing Procedure. . . . . . . . . . . . . . . . . . . . . . .23
High Limit Hot Water Thermostat . . . . . . . . . . . . . .23
Pumps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Cleaning of Coils. . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Burner Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Oil Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Electrode Setting. . . . . . . . . . . . . . . . . . . . . . . . . . .25
KNA Burner Air Adjustment . . . . . . . . . . . . . . . . . . 25
Fuel Pressure Adjustment. . . . . . . . . . . . . . . . . . . .25
Removal of Soot and Heating Coil . . . . . . . . . . . . .25
Hub Inspection Removal-
Replacement And Adjustments. . . . . . . . . . . . . . 26
Torque Wrench Method . . . . . . . . . . . . . . . . . . . . . 27
Posi-lube Lubrication Procedure. . . . . . . . . . . . . . .27
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . .30
Trailer Maintenance . . . . . . . . . . . . . . . . . . . . . . . .31
Pump And Engine Oil Change Record . . . . . . . . . .31
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C

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Safety
Important Safety Information
WARNING: To reduce the risk of
injury, read operating instruc-
tions carefully before using.
AVERTISSEMENT: Pour réduire le
risque de blessures, lire attentive-
ment les instructions de
fonctionnement avant l'utilisation.
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.
DANGER: Keep wand, hose, and
water spray away from electric
wiring or fatal electric shock may
result.
DANGER: Garder la lance, le boyau et
le jet d'eau à l'écart de tout câblage
électrique ou des chocs électriques
mortels pourraient survenir.
4.To protect the operator from elec-
trical shock, the machine must be
electrically grounded.
WARNING: Flammable liquids can
create fumes which can ignite,
causing property damage or
severe injury.
AVERTISSEMENT: Des liquides
inflammables peuvent produire des
vapeurs qui peuvent s'enflammer,
causant ainsi des dommages à la
propriété ou des blessures graves.
WARNING: Risk of explosion —
Operate only where open flame or torch is
permitted. Do not spray flammable liquids
AVERTISSEMENT: Risque d'explosion - Utiliser unique-
ment dans des endroits où l'utilisation d'une flamme nue
ou d'une torche est permise. Ne pas pulvériser de
liquides inflammables.
5. 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.
WARNING: Risk of fire — Do not
add fuel when the product is
operating or still hot.
AVERTISSEMENT: Risque
d'incendie-Ne pas ajouter de
carburant pendant que la
machine fonctionner ou est
encore chaude.
WARNING: Do not use gasoline
crankcase draining or oil
containing gasoline, solvents or alcohol. Doing so
will result in fire and/or explosion.
AVERTISSEMENT: Ne pas utiliser d'essence, de
drainage du carter de moteur ou d'essence
contenant de l'huile, de solvants ou de l'alcool.
Agir de la sorte risquerait de créer un incendie et/
ou une explo
6. Operate only in locations where combustible dusts
and flammable gases or vapors are not present.
Do not store or use gasoline near this machine.
7. Do not allow acids, caustic or abrasive fluids to
pass through the pump.
8. Never run pump dry or leave spray gun closed
longer than 1-2 minutes.
9. Keep operating area clear of all persons.
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.
AVERTISSEMENT: Un jet haute
pression peut écailler la peinture
ou provoquer l'émission d'autres
particules dans l'air et leur
projection à hautes vitesses. Pour éviter les
lésions corporelles, une protection des yeux, du
visage, des mains et des pieds doit être portée lors
de l'utilisation de cet équipement
10. Always wear properly rated eye protection such as
safety goggles or face shield while spraying.
(Safety glasses do not provide full protection.)
WARNING
READ OPERATOR’S
MANUAL THOROUGHLY
PRIOR TO USE.
OPERATIONS
SAFETY
MAINTENANCE
DANGER
KEEP WATER
SPRAY AWAY FROM
ELECTRICAL WIRING.
WARNING
RISK OF EXPLOSION:
OPERATE ONLY WHERE
OPEN FLAME OR TORCH
IS PERMITTED
WARNING
RISK OF FIRE.
DO NOT ADD FUEL
WHEN OPERATING
MACHINE.
WARNING
USE PROTECTIVE
EYEWEAR, GLOVES
AND FOOTWEAR
WHEN OPERATING.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C

5
Safety
WARNING: This machine exceeds
85 dB. Appropriate ear protection
must be worn.
AVERTISSEMENT: Cette machine
excède 85 dB et une protection de
l'ouïe appropriée doit être portée
WARNING: Hot discharge fluid.
Do not touch or direct discharge
stream at persons or animals.
AVERTISSEMENT: Liquide de
décharge chaud. Ne pas toucher
ou décharger directement le jet
vers des personnes ou des
animaux
WARNING: This machine
produces hot water and must
have insulated components attached to protect the
operator.
AVERTISSEMENT: Cette machine produit de l'eau
chaude et doit comporter des composants isolés
attachés pour protéger l'opérateur.
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-
insulated areas of the pressure
washer.
AVERTISSEMENT: Risque de
blessures. Les surfaces chaudes
peuvent causer des brûlures.
Utiliser uniquement les zones de prise désignées
du pistolet pulvérisateur et de la lance. Ne pas
placer les mains ou les pieds sur des endroits non
isolés de la laveuse à pression
11. 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: Grip cleaning wand
securely with both hands
before starting. Failure to do
this could result in injury from a
whipping wand.
AVERTISSEMENT: Agripper la
lance de nettoyage avec les
deux mains avant de
commencer. Le non-respect de
cette consigne pourrait mener à
des blessures causées par le
mouvement violent de la lance.
12. Never make adjustments on machine while in
operation.
13. Be certain all quick coupler fittings are secured
before using pressure washer.
WARNING: High pressure
developed by these machines
will cause personal injury or
equipment damage. Keep clear
of nozzle. Use caution when
operating. Do not direct
discharge stream at people or
animals, or severe injury or
death will result.
AVERTISSEMENT: La haute
pression générée par ces machines causera des
lésions corporelles ou des dommages à
l'équipement. Se tenir à l'écart de la buse. Faire
preuve de prudence lors de l'utilisation. Ne pas
décharger directement le jet vers des personnes
ou des animaux, car cela risquerait de causer des
blessures graves ou même la mort.
WARNING: Protect machine
from freezing.
AVERTISSEMENT: Protéger la
machine contre le gel
14.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. Follow storage instructions
specified in this manual.
15. Inlet water must be clean fresh water and no hotter
then 90°F.
WARNING
EAR PROTECTION
MUST BE WORN
WARNING
HOT DISCHARGE FLUID:
DO NOT TOUCH OR
DIRECT DISCHARGE
STEAM AT PERSONS.
WARNING
RISK OF INJURY.
HOT SURFACES
CAN CAUSE BURNS
WARNING
TRIGGER GUN KICKS
BACK — HOLD WITH
BOTH HANDS
WARNING
RISK OF INJECTION
OR SEVERE INJURY
TO PERSONS. KEEP
CLEAR OF NOZZLE.
WARNING
PROCTECT FROM
FREEZING
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C

6
Safety
DANGER: Risk of asphyxiation.
Use this product only in a well
ventilated area.
DANGER: Risque d'asphyxie:
Utiliser ce produit uniquement
dans un endroit bien ventilé.
1. Avoid operating machines in
small areas or near exhaust
fans. Adequate oxygen is
needed for combustion or dangerous carbon
monoxide will result.
2. Manufacturer will not be liable for any changes
made to our standard machines or any compo-
nents not purchased from us.
3. The best insurance against an accident is
precaution and knowledge of the machine.
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
possibility of a fall due to
slippery surfaces.
AVERTISSEMENT: Étant donné
que les matériaux de friction de
certains segments de frein contiennent de
l'amiante, certaines mesures de précaution doivent
être prises au moment de procéder à des
opérations d'entretien des freins
4. Do not overreach or stand on unstable support.
Keep good footing and balance at all times.
5. Do not operate this machine when fatigued or
under the influence of alcohol, prescription medica-
tions, or drugs.
Follow the maintenance instruc-
tions specified in the manual.
Reporting Safety Defects
If you believe that your trailer has a defect which could
cause a crash or could cause injury or death, you
should immediately inform the National Highway Traffic
Safety Administration (NHTSA) in addition to notifying
Kärcher.
If NHTSA receives similar complaints, it may open an
investigation, and if it finds that a safety defect exists in
a group of trailers, it may order a recall and remedy
campaign. However, NHTSA cannot become involved
in individual problems between you, your dealer or
Kärcher.
To contact NHTSA, you may either call the Auto Safety
Hotline toll-free at 1-888-327-4236 (TTY: 1-800-424-
9153) or write to:
NHTSA
1200 New Jersey Avenue, SE
West building
Washington, DC 20590
6. You can also obtain other information about motor
vehicle safety from, http://www.safecar.gov.
Checklist Before Every Trip:
• Tire pressure and tire condition
• Wheel lugs*
• Bearing lube and tightness
• Hitch
• Safety chains
• 12V running lights
• Distribution and security
• Caster up in travel position
* Check lug nuts for tightness before initial trip, at 10
miles, 25 miles and 50 miles. Recheck every 3 months
or 3000 miles.
NOTE: Checking all of the above steps before every
trip is key for safety.
WARNING
RISK OF INJURY
FROM FALLS WHEN
USING LADDER.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
DANGER
RISK OF
ASPHYXIATION.
USE THIS PRODUCT
ONLY IN A WELL
VENTILATED AREA.

7
Important Trailer Safety Information
Referencing the Utility Trailer in this
Manual
All references to the trailer or component parts to either
left or right are made with the assumption that you are
standing behind the trailer facing forward. Your left
hand or right hand is the equivalent on the trailer.
Tire Safety
The most common cause of trailer tire failure is under-
inflation. Therefore, it is important that you always
maintain the specified air pressure as indicated by the
tire manufacturer on the tire's side-walls. This informa-
tion can also be found on the tire label or the air
pressure molded on the tire side-wall.
The most important things you can do to maintaining
proper tire pressure are observe all tire and trailer
maximum carrying capacities, avoid road hazards, and
inspect the tires for cuts, slashes and other irregulari-
ties. These practices, along with other care and mainte-
nance, can improve handling, help protect you and
others from avoidable breakdowns and accidents,
improve fuel economy, and increase the life of your
tires.
Make tire safety a regular part of your trailer mainte-
nance routine. The time you spend is minimal
compared to the amount of time, inconvenience, and
potential safety hazards that can occur from a flat tire or
failure.
Basic Tire Maintenance
Properly maintained tires improve the load-carrying
capability of your trailer. You can help avoid flat tires
and tire failures by maintaining proper tire pressure,
observing tire and trailer capacity limits, avoiding road
hazards, and inspecting your tires regularly.
Identifying Your Recommended Tire
Pressure and Maximum Load Carrying
Capacity for Your Trailer
Both the tire placard and the VIN label are permanently
attached on top of the frame of your trailer and have the
required information printed on them. They also list the
maximum load that can be placed on the trailer without
exceeding the load limits of the tires or the trailers other
components. These labels indicate the manufacturer’s
information including:
Recommended tire size.
• Recommended tire inflation pressure.
• The maximum weight the trailer is designed to
carry.
• Gross vehicle weight rating of the trailer.
• Gross axle weight rating of the trailer.
Understanding Tire Pressure and Load
Limits
Tire inflation pressure is the level of air in the tire that
provides it with the load-carrying capacity and affects
the overall performance of the trailer. The tire inflation
pressure is a number that indicates the amount of air
pressure that is inside the tire. It is measured in pounds
per square inch (PSI). The tire must be inflated to the
air pressure as designated on the labels. Also listed on
the labels is the air pressure in kilo Pascals (kPa),
which is a metric measurement. Tire manufacturers
determine the air pressure to maximize the amount of
weight the tires can safely carry. The proper tire
pressure for your trailer tires is referred to as the
"recommended cold inflation pressure." It is difficult to
obtain the recommended tire pressure if your tires are
not cold when the reading is taken because the air will
expand when it is warmed by towing down the road,
thus increasing the air pressure inside. If air is added to
a tire that is low the air pressure should never exceed
the recommended pressure.
It is important to check your trailer’s tire pressure at
least once a month for the following reasons:
Most tires will naturally lose air over time.
Tires can lose air suddenly if driven over an object that
punctures or cuts the tire. Sometimes a sharp blow
from a pothole or curb can knock the tire loose from the
rim causing immediate deflation.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C

8
Important Trailer Safety Information
Maintaining Proper Tire Pressure
Locate the recommended tire pressure on the trailer's
tire information placard or owner's manual.
Record the tire pressure of all tires. If the tire pressure
is too high in any of the tires, slowly release air by
gently pressing on the tire valve stem with the edge of
your tire gauge until you get the correct pressure.
If the tire pressure is too low, note the difference
between the measured tire pressure and the correct tire
pressure. These "missing" pounds of pressure are what
you will need to add.
Add the missing pounds of air pressure to each tire that
is under inflated.
Check all tires to make sure they have the same air
pressure.
If you have been towing your trailer and think that a tire
is under inflated, fill it to the recommended cold inflation
pressure indicated on your trailer's tire label placard or
the VIN label. You can also check the sidewall of the
tire for a correct tire inflation pressure. Your tire will
have a slightly lower air pressure because the tire is
warm when you are inflating it, but it will be much better
than to continue to tow it with the under inflation it may
have had. Once the trailer has been parked long
enough to allow the tires to cool down, recheck the tire
pressure and add additional air to return the tire
pressure to the recommended level.
Tire Size
To maintain the trailer's carrying capacity and safety,
purchase only the same size tires as what were origi-
nally supplied on the trailer.
Safety Tips
Slow down if you have to go over a pothole or other
object in road.
Do not run over curbs and try not to strike the curb
when parking.
For a free brochure visit:
www.nhtsa.dot.gov
IMPORTANT: Before towing this trailer be sure to
read the instructions and warnings supplied in this
manual. Also read the information supplied with
your tow vehicle so you know and understand it's
limitations.
Never Tow the Trailer Before Checking
• Coupler and latch assembly show no signs of
wear or damage.
• Coupler hitch and hitch ball are of the same
size.
• Coupler and safety chains are safely secured to
the hitch.
• Check all fasteners for proper tightness.
• Load is securely tied down to the trailer.
• Wheel lug nuts are properly tightened to the
right torque.
• Wheel bearings are properly adjusted and
maintained.
• Load is within the maximum load carrying
capacity of trailer.
• Tires are properly inflated and are road worthy.
• All trailer lighting is working properly.
IMPORTANT: The load must be distributed equally
on the bed of the trailer if possible. Heavy, concen-
trated loads may cause damage or possible failure
of the trailer.
WARNING: Loads place on the trailer must be
securely tied to the trailer. Always use appropriate
tie downs designed to restrict loads from moving
when properly attached. Failure to do so will allow
shifting of the load causing potential trailer failure
and/or loss of the load and personal injury.
AVERTISSEMENT: Les charges placées sur la
remorque doivent être solidement attachées à la
remorque. Toujours utiliser des arrimages
appropriés conçus pour empêcher les charges de
bouger lorsqu'elles sont bien attachées. Le
nonrespect de cette consigne permettra le
mouvement de la charge, entraînant une
défaillance potentielle de la remorque et/ou une
perte de la charge et des lésions corporelles.
This trailer is equipped to meet all applicable federal
safety standards in effect the day of manufacture.
Check local and state requirements regarding any addi-
tional equipment that may be required.
The addition of optional equipment to your trailer may
in- crease the total weight of your trailer package to
where it now exceeds the maximum load carrying
capacity of the trailer.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C

9
Important Trailer Safety Information
Tow Vehicles
WARNING: Serious injury or property damage can
result if the total weight of your loaded trailer exceeds
the capacity of the hitch and/or your tow vehicle.
AVERTISSEMENT: Des blessures graves ou de
dommages à la propriété peuvent survenir sir le poids
total de la remorque chargée excède la capacité de
l'attelage et/ou du véhicule remorqueur.
It is very important that you know and understand the
towing capabilities of your tow vehicle. This is especially
true with the braking abilities of the tow vehicle. You
should check with your authorized dealer to see what the
capabilities are for the total towing load and the maximum
allowable tongue weight for the vehicle you plan on using
for towing.
It is also important that the lighting system in the tow
vehicle has sufficient capacity support the additional load
the trailer lighting will add to the system. A heavy duty
flasher may be required to make your turn signals function
properly.
Trailer Ball & Couplers
WARNING: Failure to properly engage the hitch ball in
the coupler ball socket and securely lock the coupler
latch mechanism can cause the trailer to become
detached from the tow vehicle while traveling, which
may cause serious injury or property damage.
AVERTISSEMENT: Le non-respect d'engager
correctement la boule d'attache dans la cavité de la
boule de l'attelage et de verrouiller solidement le
mécanisme du loquet de l'attelage pourrait mener la
remorque à se détacher du véhicule remorqueur
pendant le déplacement, ce qui pourrait causer des
blessures graves ou des dommages à la propriété
Ball diameter for which rating (GVWR) shall not exceed
the gross trailer weight marked on the trailer coupler.
The hitch balls have the rated load they are capable of
towing stamped Into the top of the ball.
Make sure the ball that you use to tow your trailer has the
same capacity rating as the coupler.
Do not use a different size ball than the size the coupler is
designed to use.
Hitch Coupler Troubleshooting
If the coupler becomes damaged it must be repaired or
replaced before towing. When the coupler is placed on the
ball, the latch should close firmly. Keep the latch
mechanism lightly oiled and clean. Items to check for are
as follows:
1. Latch does not grasp ball securely:
• Check the ball size. Make sure the ball and
coupler are the same size.
2. Latch does not snap into full latch position:
• Check adjustment. Latch mechanism may be too
tight.
• Check to see that the coupler housing has not
been damaged, keeping the ball hitch from fitting
completely into the housing as designed.
3. Keep the tongue blocked up when not in use so the
coupler and mechanism are not in the ground being
exposed to dirt and moisture.
4. Apply a small amount of an automotive grease to the
ball before hitching coupler to prevent wear of the two
parts during towing.
5. Make sure the latch safety pin is in position before
towing.
Coupler & Ball Engagement
If the coupler and towing ball resist attempts to make
engagement, do not force latch assembly. Instead, check
the ball diameter to verify that it conforms to Society of
Automotive Engineers (SAE) specifications. Standard two-
inch diameter ball should be within the limits of 2.000-
inches to 1.970-inches. Balls larger than 2.000- inches will
not readily fit the coupler. A two-piece coupler ball is not
recommended.
If the coupler becomes damaged it must be repaired or
replaced before towing. When the coupler is placed on the
ball, the latch should close firmly. Keep the latch
mechanism lightly oiled and clean.
Improper engagement of the coupler and ball can cause
damage if the vehicles separate in transit, thus, caution
must be exercised to insure a secure hook-up. Lower the
coupler onto the ball with the coupler latch in the vertical
position. Continue to lower the trailer tongue until the jack
clears the ground, then flip the coupler latch to its locked
(horizontal) position. At this point visually observe that the
ball is fully engaged in the ball hitch. An even better check
to make sure the two are fully engaged is to raise the
tongue of the trailer again using the jack. Raise until the
ball hitch connection starts to raise the rear of the tow
vehicle. If the connection was not properly made, the ball
and socket will separate as the tongue of the trailer is
raised.
Class Coupler Ball Diameter
II 3,500# GVWR 2”
III 5,000# GVWR 2”
IV 8,000# GVWR 2”
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C

10
Important Trailer Safety Information
Safety Chains
Listed in the chart below are the different class sizes of
safety chains and the rated load each chain must be
capable of withstanding.
WARNING: Failure to properly attach safety chains
between the trailer and tow vehicle can result in a
runaway trailer.
AVERTISSEMENT: Le non-respect de fixer
correctement les chaînes de sécurité entre la
remorque et le véhicule remorqueur peut mener à
l'emballement de la remorque.
WARNING: To avoid accidents, before trailering:
AVERTISSEMENT: Pour éviter les accidents avant
de procéder à un remorquage :
• Hitch only to ball size marked on coupling.
• Atteler uniquement à une boule dont la taille
correspond à celle indiquée sur l'attelage.
• Ball clamp must capture ball and lever or hand
wheel is fully clamped.
• La boule de serrage doit capturer la boule et le
levier ou le volant à main est complètement
serré.
• Cross safety chains under coupling.
• Croiser les chaînes de sécurité sous l'attelage.
• Allow only enough slack for turns.
•Laisser suffisamment de jeu pour permettre la
rotation libre.
The safety chains on your trailer are an added
insurance that it will not become detached from the tow
vehicle. All safety chains are provided with an added
clasp to keep them from becoming accidentally
detached from the tow vehicle. Your trailer hitch on the
tow vehicle should have two attaching holes or rings for
attaching the safety chains, preferably one on each
side of the ball hitch. Crisscross the chains under the
tongue, the chain on the left side of the trailer tongue
attached to the right side of the ball hitch, the chain on
the right side of the trailer tongue attached to the left
side of the ball hitch.
This prevents the trailer tongue from dropping to the
road should the coupler or ball hitch fail. The chains
should be rigged as tight as possible with just enough
slack to allow tight turns to be made. This can be
accomplished by twisting the chain hook in a clockwise
or counterclockwise direction thus twisting the link
spacing and making the chain shorter. Also by keeping
your chains as short as possible you prevent them from
dragging on the road and wearing the chain links. If for
any reason you find it necessary to replace a safety
chain, use only original equipment.
Load-Carrying Capacity
Located on the front left-hand side of the frame, (either
the inside or the outside) is the VIN (Vehicle Identifica-
tion Number) tag. It will show the GVWR (Gross Vehicle
Weight Rating) which is the maximum load that can be
applied to the tires on the trailer. The GVWR and the
carrying capacity of the trailer are based on the tire size
installed on the trailer.
The GVWR is the maximum carrying capacity of the
trailer with its respective tires. It may not necessarily
equal the total GVWR of the trailer less the empty
weight of the trailer because there may be another
controlling factor such as frame strength that reduces
the carrying capacity to what is listed on the VIN tag.
TRAILER
C L A S S
TRAILER
WEIGHT GVWR
IN LBS.
MINIMUM BRAKING
STRENGTH IN LBS.
I to 2,000 2,000
II 2,000 to 3,500 3,500
III 3,500 to 5,000 5,000
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
Bottom View

11
Important Trailer Safety Information
The tire label will list the tire size that was installed on
the trailer as original equipment when it was sold to
you, the consumer. It also lists the maximum carrying
capacity of the trailer.
IMPORTANT: The total weight of the load must
never exceed the weight of cargo listed on the tire
label and/or the maximum load carrying capacity
listed on the VIN tag on your trailer. The GVWR
(Gross Vehicle Weight Rating) listed is the
maximum total weight of the trailer with accesso-
ries and all cargo allowable to be carried on the
tires that are installed on the trailer.
WARNING: Fishtailing caused from improper
tongue weight on the tow vehicle hitch ball can
cause loss of control of the tow vehicle and
resulting serious injury or property damage.
AVERTISSEMENT: Une embardée causée par un
poids de l'attelage inapproprié sur la boule
d'attache du véhicule remorqueur peut causer une
perte de contrôle du véhicule remorqueur et causer
des blessures graves et des dommages à la
propriété
CAUTION: The maximum load applied to the trailer
must never exceed the carrying capacity of the
trailer as stated on the VIN label and/or the tire
placard. Doing so may cause failure of one or more
component parts of the trailer causing potential
damage to the trailer and/ or a potential accident.
All concentrated loads must be spread over as
large an area as possible to eliminate potential
damage to the decking.
ATTENTION: Risque de blessures causées par une
buse mal verrouillée. Agir de la sorte risquerait de
causer une défaillance d'une ou plusieurs
composantes de la remorque, causant des
dommages potentiels à la remorque et/ou un
accident potentiel. Toutes les charges concentrées
doivent être réparties sur une surface aussi large
que possible pour éliminer tout dommage potentiel
au patio
Shown next is an example of the tire label that is placed
on your trailer showing the items just discussed above.
Once you have familiarized yourself with the informa-
tion supplied on the example tire label and VIN tag,
check the tire size and capacity of your trailer as shown
on the VIN tag on your trailer.
Proper Weight Distribution & Tongue
Weight
Ensuring that your trailer has the proper GVWR is very
important. Once that has been established and you
have the load on the trailer it is equally important that
you have proper weight distribution.
Tongue Weight
The tongue weight on your trailer is 10%-15% of the
total weight of the trailer and all the cargo that it is
carrying. This is the amount of weight that is then trans-
ferred to the tow vehicle through the ball hitch.
Example: The total weight of the trailer with load is 800
pounds. The tongue weight should not be less than 80
pounds (10%).
Too light of tongue weight can cause the trailer to “fish-
tail” (sway Weight Rating) as you travel down the
highway. This creates excessive strains on the tow
vehicle, hitch and on the trailer itself. It can very easily
lead to an accident.
To adjust for too light of a tongue weight the load must
be shifted forward with respect to the axle. This will
increase the weight that is transferred to the tongue.
Adjustments should be made until the tongue weight
falls within 10% -15% recommended range. Likewise, if
you have too much tongue weight adjust the weight
backwards with respect to the axle until the tongue
weight falls in the recommended range
Tow vehicles vary on how much tongue weight they can
support for proper towing.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
TIRE AND LOADING INFORMATION
RENSEIGNEMENTS SUR LES PNEUS ET LE CHARGEMENT
The weight of cargo should never exceed
XXXX kg or XXXX lbs
TIRE SIZE COLD TIRE PRESS.
REAR XXXXXXX XXX KPA (XX PSI)
INTER XXXXXXXXX
FRONT XXXXX
SPARE XXXXX
SEE OWNER’S
MANUAL FOR
ADDITIONAL
INFORMATION
VOIR LE MANUAL
DE L’USAGER
POUR PLUS DE
RENSEIGNEMENTS
MANUFACTURED BY: KARCHER NORTH AMERICA INC. DATE OF MFG.:XX/XXXX
GAWR (EACH AXLE)
V.I.N. : TYPE : TRAILER TRX-XXXX
WITH TIRES RIMS AT COLD
XXXX KG (XXXX LB) XXXX XXXX XXX KPA (XX PSI) SINGLE
THIS VEHICLE CONFORMS TO ALL APPLICABLE U.S. FEDERAL MOTOR VEHICLE SAFETY STANDARDS
IN EFFECT ON THE DATE OF MANUFACTURE SHOWN ABOVE.
XXXXXXXXXXXXXXXXX
GVWR (XXXX KG (XXXX LB)

12
Important Trailer Safety Information
Caster Operations
This trailer has a caster for manual transporting while
using the pressure washer and to keep the trailer
tongue off the ground when not trailering.
WARNING: The caster must be in the up position
when trailering the unit.
AVERTISSEMENT: La roulette doit être en position
relevée lors du remorquage de l'appareil.
STEP 1: Release the quick release pin by rotating it
clock wise. Pull Quick release pin from receptacle.
Rotate the caster clockwise.
STEP 2: Insert quick release pin in receptacle. Lock
quick release pin in place by rotating pin counter clock-
wise. Reverse step to lower caster.
NOTE: Before towing, diesel shut-off valve must be in
the OFF position.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
Quick release
pin

13
Important Trailer Safety Information
Trailer Brake Operations
WARNING: To avoid injury, the trailer brake must
be set when operating the pressure washer or
when not in use.
AVERTISSEMENT: Pour éviter les blessures, le
frein de la remorque doit être serré lors de l'utilisa-
tion du nettoyeur haute pression ou lorsqu'il n'est
pas utilisé.
To set the brake, press down on the brake pedal until it
engages on the back tires.
To release the brake, push the center of the brake to
release see that it has disengaged from the back tire.
CAUTION: This brake has a spring mechanism that
will return brake to its dis-engaged state. Make sure
foot or hand is moved out of the pinch point area.
ATTENTION : Ce frein est doté d'un mécanisme à
ressort qui ramènera le frein à son état désengagé.
Assurez-vous que le pied ou la main est sorti de la
zone du point de pincement.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C

14
What to Check And How To Check
Tire Pressure
Proper air pressure for your tires is printed on the
sidewall. Check pressure while tires are cold. Do not
raise or lower pressure to meet load. Pressure other
than recommended pressure will lead to excessive tire
wear or tire failure. Balancing recommended.
Wheels
Check wheels for hole elongation or “out of round”. This
condition can be caused by lug nuts not being tight or
being too tight. Trailer wheels can be damaged by
chuck holes or curb jumping. You may not be aware of
the road shock to the wheels without periodic checks.
Replace any wheel that is bent. Replace any wheel if
you see elongation of the bolt holes.
Wheel Lugs
Wheel lug nuts must be tightened with a torque wrench.
Refer to the chart below for proper torque.
1. Start all bolts or nuts by hand to
prevent cross threading.
2. Tighten bolts or nuts following
sequence at right.
3. The tightening of the fasteners
should be done in stages.
Following the recommended sequence, tighten
fasteners per wheel torque chart below.
4. Wheel nuts/bolts should be torqued before first
road use and after each wheel removal. Check and
re-torque after the first 10 miles, 25 miles and
again at 50 miles. Check periodically thereafter.
Wheel Torque Requirements
Ball Coupler Hitches
Coupler assembly includes a latch lever and latch lever
safety pin or hitch pin. Be sure the latch lever is locked
and the pin properly secured before moving your trailer.
The pin can be engaged fully only if ball is properly
seated in the coupler.
Tires
Before mounting tires onto wheels make certain that
the rim size and contour is approved for the tire as
shown in the Tire and Rim Association Yearbook or the
tire manufacturer’s catalog. Also make sure the tire will
carry the rated load. If the load is not equal on all tires
due to trailer weight distribution, use the tire rated for
the heaviest wheel position.
NOTE: The capacity rating molded into the
sidewall of the tire is not always the proper rating
for the tire if used in a trailer application. Use the
following guideline:
1. LT and ST tires: use the capacity rating molded into
the tire.
2. Passenger Car Tires: Use the capacity rating
molded into the tire sidewall divided by 1.10.
Use tire mounting procedures as outlined by the
Rubber Manufacturer’s Association or the tire manufac-
turers.
NOTE: Tire wear should be checked frequently
because once a wear pattern becomes firmly
established in a tire it is difficult to stop, even if
the underlying cause is corrected.
WHEEL
SIZE
TORQUE SEQUENCE
1st Stage 2nd Stage 3rd Stage
16" 20 - 25 50 - 60 80-90
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
1
2
34
5
WEAR PATTERN CAUSE ACTIONACTION
Center
Wear
Over
Inflation
Adjust pressure
to particular
load per tire
catalog.
Edge
Wear
Under
Inflation
Adjust pressure
to particular
load per tire
catalog.
Side Wear
Loss of
camber or
overloading
Make sure load
doesn't exceed
axle rating.
Align at align-
ment shop.
Toe Wear Incorrect
toe-in
Align at align-
ment shop.
Cupping Out of
balance
Check bearing
adjustment and
balance tires.
Flat
Spots
Wheel
lockup & tire
skidding
Avoid sudden
stops when
possible and
adjust brakes.

15
Operations
Trailer 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.
Thermostat — Control the coil water output
temperature.
Safety Relief Valve — Secondary pressure release in
the unlikely event the unloader valve fails.
Unloader Valve — Safety device which, when the
spray gun closes, prevents over pressurization.
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
protector onto floor. This system prevents internal
pump damage.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
(Optional)
Control Panel
Thermostat
Chemical Injector
Battery Box
Spray Gun
Trigger
Water Inlet
Safety Chains
Wand
Nozzle Quick Coupler
Hitch Channel
Gasoline Tank
Hose and Wand Storage
Diesel Tank
Discharge Manifold
and Safety Relief Valve
Pump & Unloader Valve
VIN Plate
High Pressure
Outlet
High Pressure Hose

16
Operations
Accessory Assembly Instructions
Handle Installation
Align the 4 holes in the handle with the holes in the
back plate, install the fasteners and washers supplied.
(See Hose Box and Fuel Tank pages for fastener part
numbers.)
NOTE: Fastener assembly torque to install handle:10
ft-lbs (due to hollow tube handle.)
Safety Rod installation
Slide the rod through both holes in the tabs. To secure
rod, bend both tabs up slightly, until the rod does not
move freely. (See Hose Box and Fuel Tank pages for
fastener part numbers.)
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
Handle
Bolt
Washer
Nut
Rod
Tab

17
Operations
Assembly Instructions
STEP 1: Attach a 5/8" garden hose
to inlet connector. Minimum flow
should be 5 gpm.
STEP 4: Check oil level on sight
glass on backside of pump. Oil
should be visible one-half way up
sight glass (10-40W non-foaming).
The oil level can also be checked
by using the dipstick on the top of
the pump.
STEP 2: Attach high pressure hose
to discharge nipple using quick
coupler. Lock coupler securely into
place by pulling back coupler collar
and inserting it onto discharge
nipple, then pushing collar forward
to lock in place.
NOTE: If using detergent injector,
attach detergent injector to
discharge nipple using quick
coupler. Attach high pressure
hose to other end of detergent
injector.
STEP 5: Fill gasoline tank and
check engine oil.
Fill diesel tank with diesel fuel.
STEP 3: Attach wand to spray gun
using teflon tape on threads to
prevent leakage. Attach swivel
connector on discharge hose to
spray gun using teflon tape on
threads. Attach swivel connector on
high pressure hose to spray gun
using teflon tape on threads.
Engage safety latch to prevent from
triggering gun.
STEP 6: On electric start models,
you will need to install a battery
making sure that the red cable is
attached to the positive terminal.
Use a Group U1 garden tractor
style type of battery rated for 300
CCA (battery not included).
NOTE: Battery is required for
burner to operate.
CAUTION: These machines are
intended to be protected from
outside environments.
Attention : Ces machines sont
destinées à être protégées des
environnements extérieurs.
CAUTION: Risk of injury. Discon-
nect battery ground terminal
before servicing.
ATTENTION : Risque de blessure.
Débranchez la borne de masse de
la batterie avant l'entretien.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
Inlet
Connector
High Pressure
Hose
Discharge
Nipple
Detergent
Hose
Detergent
Injector
(Option)
Dipstick
Gasoline
Tank
POS NEG
Red
Black
Diesel Fuel
Tank
Safety
Latch
.CAUTION: Do not confuse diesel
fuel and gasoline when filling tanks.
Keep proper fuel in proper tanks.
ATTENTION: Ne pas confondre du
carburant diesel et l'essence au
moment de remplir les réservoirs.
Garder le carburant approprié dans
des réservoirs appropriés.
NOTE: Diesel Fuel Shut-off must be in the ON position prior to turning on
burner.

18
Operations
Installation
Place machine in a convenient location providing
ample support, draining and room for maintenance.
This machine is intended for outdoor use. Machine
must be stored indoors when not in use.
Location
The location should protect the machine from
damaging environmental conditions, such as wind, rain,
and freezing.
1. This machine should be run on a level surface
where it is not readily influenced by outside
sources such as strong winds, freezing tempera-
tures, rain, etc. It should be located to allow acces-
sibility for refilling of fuel, adjustments and
maintenance. Normal precautions should be taken
by the operator of the machine to prevent moisture
from reaching the electrical controls.
2. It is recommended that a partition be made
between the wash area and the machine to
prevent water spray from coming in contact with
the machine. Excess moisture reaching any
electric components or electrical controls will
reduce machine life and may cause electrical
shorts.
3. During installation of the machine, beware of
poorly ventilated locations or areas where exhaust
fans may cause an insufficient supply of oxygen.
Sufficient combustion can only be obtained when
there is a sufficient supply of oxygen available for
the amount of fuel being burned. If necessary to
install a machine in a poorly ventilated area
outside, fresh air may have to be piped to the
burner and a fan installed to bring air into the
machine.
Avoid small locations or areas near exhaust fans.
Placement
Do not locate near any combustible material. Keep all
flammable material at least 20 feet away.
Allow enough space for servicing the machine.
Local code will require certain distances from floor and
walls. (Two feet away from walls should be adequate.)
Water Source
The water source for the pressure washer should be
supplied by a minimum 5/8" I.D. garden hose with a city
water pressure of not less than 5 GPM. If the water
supply is inadequate, or if the garden hose is kinked,
the attached pressure washer will run very rough and
the burner will not fire.
Connection
Connect the wand, nozzle, hose and spray gun (where
applicable). On pipe thread connections, use Teflon
tape to avoid water leaks. (See Component Identifica-
tion).
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C

19
Operations
Operating Instructions
STEP 1: Turn water on.
STEP 4: For hot water, turn
thermostat to desired temperature
and turn burner switch to the on
position.
STEP 2: Grip spray gun handle
securely and pull trigger.
STEP 3: Turn the engine key
switch to the on position till the
engine starts.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
NOTE: High pressure nozzle must be inserted at
end of wand to obtain high pressure. To apply
detergent, read operator's manual.
SenDEC
TACH/HOUR1/10
High Pressure Hose
Nozzle Quick Coupler
Safety Latch
CHAUD!
Gas
Valve
Choke
Engine
Switch

20
Operations
Detergents & General
Operating Techniques
WARNING: Some detergents may
be harmful if inhaled or ingested,
causing severe nausea, fainting or
poisoning. The harmful elements
may cause property damage or
severe injury.
AVERTISSEMENT: Certains déter-
gents peuvent être dangereux s'ils
sont inhalés ou ingérés, provo-
quant de fortes nausées, des
évanouissements et l'empoisonne-
ment. Les éléments dangereux peuvent causer des
dommages à la propriété ou des blessures graves.
STEP 1: Connect high pressure hose
to injector with quick coupler (check to
make sure locking coupler sleeves
are in proper position before applying
water pressure. If using detergent
injector, connect it to discharge nipple
on machine.
STEP 2: Use detergent designed
specifically for pressure washers.
Household detergents could damage the pump. Prepare
detergent solution as required by the manufacturer. Fill a
container with pressure washer detergent. Place the filter
end of detergent suction tube into the detergent container.
STEP 3: Apply safety latch to spray
gun trigger. Turn variable pressure
control handle until discharge water
exits both tubes. Secure black
detergent nozzle into quick coupler
if you have a single wand.
NOTE: Detergent cannot be applied
using Red, Yellow, Green or White nozzles.
STEP 4: 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.
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 discharging 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
detergent 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
washing.
CAUTION - Never use
• Bleach, chlorine and other corrosive chemicals
• Liquids containing solvents (i.e., paint thinner,
gasoline, oils)
• Tri-sodium phosphate products
• Ammonia products
• Acid-based products
ATTENTION: Ne jamais utiliser:
• Eau de Javel, produits à base de chlore et autres
produits chimiques corrosifs
• Liquides contenant des solvants (c.-à-d. diluant à
peinture, essence, huiles, etc.)
• Produits à base de tripolyphosphate de sodium
• Ammoniac ou produits à base d'acide
These chemicals will harm the machine and will damage
the surface being cleaned.
Karcher HDS 3.5/40 GE MT Operator’s Manual 9.807-942.0 - C
WARNING
High
Pressure
Hose
Detergent
Injector
(Option)