Landa SEHW6-3500 User manual

8.913-932.0
OPERATOR’S MANUAL
For technical assistance or the Landa Dealer nearest you,
consult our web page at www.landa.com
■ SEHW6-3500
SEHW
89139320-7
L
I
S
T
E
D
®

CONTENTS
2
LANDA SEHW • 8.913-932.0 • Rev. 02/12a
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
Assembly Instructions 7
Operation Instructions 8
Detergents & General Cleaning Techniques 9
Shut Down Instructions 10
Storage 10
Troubleshooting 11-14
Preventative Maintenance 15-16
Maintenance & Service 17-18
Coil Removal & Installation 18-19
Exploded View 20-21
Exploded View Parts List 22-23
Float Tank Assembly & Parts List 24-25
Control Panel Assembly & Parts List 26-27
Hose, Spray Gun & Wand Assembly & Parts List 28
Specifications 29-31
LT Pump Exploded View and Parts List 32-33
VRT 3 Unloader 34
VB8 Unloader 35
Warranty

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
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 op-
erators.
IMPORTANT SAFETY
INFORMATION
READ OPERATOR’S
MANUAL THOROUGHLY
PRIOR TO USE.
WARNING: To reduce the risk of
injury, read operating instruc-
tions carefully before using.
1. Read the owner's manual
thoroughly. Failure to follow
instructions could cause mal-
function of the machine and
result in death, serious bodily
injury and/or property dam-
age.
2. Know how to stop the machine and bleed pressure
quickly. Be thoroughly familiar with the controls.
3. Stay alert — watch what you are doing.
4. 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.

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
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 operation.
14. Be certain all quick coupler fit-
tings are secured before using
pressure washer.

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
5
PRESSURE WASHER OPERATOR’S MANUAL
IMPORTANT SAFETY INFORMATION
Follow the maintenance instructions
specified in the manual.

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
OPERATOR’S MANUAL PRESSURE WASHER
6
89139320-1
COMPONENT IDENTIFICATION
Variable
Pressure
Wand
Inlet Swivel
Connector
Detergent
Pickup
Tube
Detergent
Bucket
(not included)
Water Supply
Hose
High
Pressure
Nozzle
High Pressure
Nozzle Coupler
Control
Handle
Fuel Tank
Plug to be
Installed by a
Qualified Electrician
Power Cord
High
Pressure
Hose
Pump & Burner
Switch
Water Supply
Hose
(not included)
High Pressure
Discharge
Nipple
Trigger
Temperature
Control Knob
High Pressure
Discharge
Coupler
Detergent
Valve
High
Pressure
Nozzles
Hour
Meter
Spray Gun
Rupture Disk
Pump — Delivers a specific gpm to the high pressure
nozzle which develops pressure (Not Shown).
Spray Gun — Controls the application of water and
detergent onto cleaning surface with trigger device.
Includes safety latch.
Detergent Valve — 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.
Rupture Disk — Secondary pressure release in the
unlikely event the unloader valve fails.
Unloader Valve — Safety device which, when the
spray gun closes, prevents over pressurization (Not
Shown).
NOTE: If trigger on spray gun is released for more than
2 minutes, water will leak from the pump protector.
Warm water will discharge from pump protector onto
floor. This system prevents internal pump damage.

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
7
PRESSURE WASHER OPERATOR’S MANUAL
ASSEMBLY INSTRUCTIONS
STEP 1: Place machine in a con-
venient location providing ample
support, drainage and room for
maintenance.
Location of machine is important.
Avoid installing near combustible
material or in poorly ventilated ar-
eas. Machines are intended to be
protected from the outside environ-
ment.
Electrical connection to machine
should be the proper voltage, phase
and amperage. See specifications
for particular model. A power plug
is not provided to ensure proper
connection by an electrician.
STEP 3: Fill fuel tank with proper
fuel.
STEP 2: Water source for ma-
chines 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 in-
adequate, 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.
Burner
Fuel Tank

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
OPERATOR’S MANUAL PRESSURE WASHER
8
OPERATION INSTRUCTIONS
STEP 1: Read safety, installation
and preventative maintenance in-
structions before starting machine.
Connect the water supply hose to
the float tank inlet swivel connector
and turn on water supply.
STEP 3: Attach wand to spray gun
using teflon tape on threads to pre-
vent leakage. Attach swivel connec-
tor 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.
STEP 2: Connect the high pressure
hose quick coupler to the discharge
nipple by sliding quick coupler collar
back and inserting the quick coupler
onto the coupler nipple and pushing
the quick coupler collar forward to
secure it.
STEP 4A: Grip spray gun and wand
handle securely.
Press the pump switch “ON” and
then pull trigger on the spray gun
to activate pressure switch which
starts machine. (For auto start ma-
chines only.)
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.)
STEP 4B: For time delay shut down
machines simply press pump switch
“ON” and the machine will start.
Before installing pressure nozzle.
Run machine allowing water to flush
through the system until clear. Then
insert high pressure nozzle.
STEP 5: With spray nozzle pointed away from you or
anybody else, press trigger on spray gun to obtain
pressurized cold water spray.
Selection of high or low pressure is accompanied by
turning the handle. NOTE: High pressure nozzle must
be inserted at end of wand to obtain high pressure.
To apply soap read operator’s manual. Note: Engage
safety latch when inserting high pressure nozzle to
prevent from triggering gun.
Variable Pressure
Control Handle Trigger
Variable Pressure
Wand (VP)
High
Pressure
Nozzle
Brass Soap
Nozzle
89139320-2
89139320-9
Pump
Switch
Burner
Switch
Temp.
Control
Knob
Safety
Lock
Wand
Trigger
Gun
High Pressure
Hose

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
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.
STEP 1: Use detergent designed
specifically for pressure wash-
ers. Household detergents could
damage the pump. Prepare deter-
gent 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 2: Apply safety latch to spray gun trigger. Se-
cure black detergent nozzle into quick coupler. NOTE:
Detergent cannot be applied using the Yellow nozzle.
STEP 3: With the motor running, pull trigger to oper-
ate 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 injection sys-
tem after each use by placing the suction tube
into a bucket of clean water, then run the pressure
washer in low pressure for 1-2 minutes.
THERMAL PUMP
PROTECTION
If you run your pressure washer for 3-5 minutes without
pressing the trigger on the spray gun, circulating water
in the pump can reach high temperatures. 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 de-
tergent suction tube directly into cleaning solution and
apply to surface at low pressure (for best results, limit
your work area to sections approximately 6 feet square
and always apply detergent from bottom to top). Allow
detergent to remain on surface 1-3 minutes. Do not
allow detergent to dry on surface. If surface appears
to be drying, simply wet down surface with fresh water.
If needed, use brush to remove stubborn dirt. Rinse at
high pressure from top to bottom in an even sweeping
motion keeping the spray nozzle approximately 1 foot
from cleaning surface. Use overlapping strokes as you
clean and rinse any surface. For best surface cleaning
action spray at a slight angle.
Recommendations:
• Before cleaning any surface, an inconspicuous
area should be cleaned to test spray pattern and
distance for maximum cleaning results.
• If painted surfaces are peeling or chipping,
use extreme caution as pressure washer may
remove the loose paint from the surface.
• Keep the spray nozzle a safe distance from the
surface you plan to clean. High pressure wash
a small area, then check the surface for dam-
age. If no damage is found, continue to pressure
washing.
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. Remove black soap
nozzle from the quick coupler. 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
DETERGENTS & GENERAL CLEANING TECHNIQUES
89139320-10
Detergent
Pick-Up
Tube
Detergent
Bucket
(Not Included)
Detergent
Valve

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
OPERATOR’S MANUAL PRESSURE WASHER
10
SHUTDOWN INSTRUCTIONS
STEP 1: Place detergent line in a
bucket of clear water allowing de-
tergent to be flushed from system.
Then turn detergent valve off.
STEP 3: Turn water off and remove
water supply hose.
STEP 2: Push burner switch off
and pull spray gun allowing water
to flow which will cool down the
heating coil.
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.
CAUTION: Always store your pressure
washer in a location where the tempera-
ture will not fall below 32°F (0°C). The
pump in this machine is susceptible to
permanent damage if frozen. FREEZE DAMAGE IS
NOT COVERED BY WARRANTY.
1. Stop the pressure washer, squeeze spray gun
trigger to release pressure.
2. Detach water supply hose and high pressure
hose.
3. Turn on the machine for a few seconds, until
remaining water exits. Turn engine off immediately.
4. Drain the gas and oil from the engine.
5. Do not allow high pressure hose to
become kinked.
6. Store the machine and accessories in a room which
does not reach freezing temperatures.
STORAGE
STEP 4: Open spray gun to relieve
remaining pressure.
Pump
Switch
Burner
Switch
Temp.
Control
Knob
After Extended Storage
CAUTION: Prior to restarting, thaw out any
possible ice from pressure washer hoses,
spray gun or wand.

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
11
PRESSURE WASHER Troubleshooting Guide
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 mis-adjusted 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
requirements. Obtain a different power source.
Detergent metering valve left open
sucking 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. Replace as needed.
Disconnected or short in electrical
wiring
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

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
PRESSURE WASHER Troubleshooting Guide
12
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
pressure.
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

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
13
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
RELIEF VALVE
OUT LEAKS OR
SPRAYS WATER
Spray nozzle plugged Remove nozzle and clean out obstruction.
Mis-adjusted 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.
Restricter in float tank missing Install restricter.
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, metering 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

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
PRESSURE WASHER Troubleshooting Guide
14
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.

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
15
PRESSURE WASHER OPERATOR’S MANUAL
PREVENTATIVE MAINTENANCE
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 Landa 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
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
Date Oil Changed
Month/Day/Year
Estimated Operating
Hours Since Last
Oil Change

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
OPERATOR’S MANUAL PRESSURE WASHER
16
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 contaminated 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 use
a Landa recognized coil cleaning detergent.
6. Do not allow acidic, caustic or abrasive fluids to be
pumped through system.
7. Always use high grade quality Landa cleaning
detergents.
8. Never run pump dry for extended periods of time.
9. Periodically delime coils as per instructions.
10. If machine is operated with smoky or eye-burning
exhaust, coils will soot up, preventing water from
reaching maximum operating temperature. (See
section on Burner Adjustments).
MAINTENANCE & 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: WAYNE
ELECTRODE SETTING: BECKETT
Fuel Control System:
These machines utilize a fuel solenoid valve located on
the fuel pump to control the flow of fuel to the combus-
tion chamber. This solenoid valve, which is normally
closed, is activated by a flow switch when water is flow-
ing 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 tem-
peratures, and combustion smoke normally associated
with machines incorporating a spray gun.
Gap
1/8"
3/8"
3/16"
1/8"
1/2"
Electrodes
Nozzle
Adapter
2-7/8"
Top View Side View
Periodically Check Wiring Connections.
If Necessary To Adjust Electrodes, Use Diagram
5/32" Gap
1/16" Nozzle
Electrode
7/16"

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
17
PRESSURE WASHER OPERATOR’S MANUAL
MAINTENANCE & SERVICE
CAUTION: Periodic inspection is recommended to
insure that the fuel solenoid valve functions properly.
This can be done by operating the machine and check-
ing 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 de-
crease. 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. (See illustration)
Air Adjustment:
The oil burner on this machine is preset for opera-
tion at altitudes below 1000 feet. 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: start machine and turn burner ON. Loosen
two locking screws found in the air shutter openings
(refer to illustration on page 8) and close air shutter
until black smoke appears from burner exhaust vent.
Note air band position. Next, slowly open the air shutter
until white smoke just starts to appear. Turn air shutter
halfway back to the black smoke position previously
noted. Tighten locking screws.
If the desired position cannot be obtained using only
the air shutter, lock the air shutter in as close a position
as can be obtained, then repeat the above procedure
on the air band setting.
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 pre-
ventative for liming conditions is to use high quality
cleaning detergents. In areas where alkaline water is an
extreme problem, periodic use of Landa Deliming Pow-
der (Landa Part #9-028008) will remove lime and other
deposits before coil becomes plugged. (See Deliming
Instructions for use of Landa Deliming Powder.)
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 one spray nozzle. Dif-
ferent 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.
AIR BAND
LOCKING SCREW
AIR SHUTTER
LOCKING SCREW
AIR SHUTTER
AIR BAND

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
OPERATOR’S MANUAL PRESSURE WASHER
18
MAINTENANCE & SERVICE
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. Occasional adjustment of the
unloader may be necessary to maintain correct pres-
sure. Consult your local Landa Dealer for the correct
procedure in adjusting the unloader valve.
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 nec-
essary. 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 fit-
ting 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 eliminating
the unloader from the system and attaching the dis-
charge 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.
10. Replace or repair any insulation found to be torn
or broken.
11. To reinstall new or cleaned coil, reverse steps 9
through 1.
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.

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
19
PRESSURE WASHER OPERATOR’S MANUAL
COIL REMOVAL & INSTALLATION
89139320-3
Top
Wrap
3/8"
Screw Insulation
Tabs
Hold
Down
Bolt
Insulation
Retainer Plate
1/2" Pipe
Nipple
Thermostat
Sensor
Discharge
Manifold
Capillary
Tube
Rupture
Disk Hose
Rupture
Disk
1/2" Pipe
Nipple
Burner
Assembly
Insulation
Coil

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
OPERATOR’S MANUAL PRESSURE WASHER
20
EXPLODED VIEW - LEFT SIDE
89139320-4
12
10
28
20
1
6
9
16
19
41
25
24
23
21
26
22
27
16
26 13
11
29
77
17, 28,41
14
73 78
58
60
46
57
35 36
90
91
38
40
30
34
15
5
4
89
88
60
61
59
87
88
26
26
86 17
14
15