Landa SLT User manual

OPERATOR’S MANUAL
For technical assistance or the dealer nearest you,
consult our web page at www.landa.com
 SLT5-30824E 1.110-519.0  SLT6-32824E 1.110-521.0
 SLT8-30824E 1.110-523.0  SLX10-25824E 1.110-526.0
SLT/SLX
DIESEL ENGINE
8.914-003.0

CONTENTS
2
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.
Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
Introduction & General Safety Information 3-5
Component Identification 6
Assembly Instructions 7
Operating Instructions 8
Detergents & General Washing Techniques 9
Shutting Down & Clean-Up 10
Storage 10
Troubleshooting 11-13
Maintenance, Service, & Schedule 14-17
SLT Burner Assembly & Parts List 18-19
SLT Exploded Views & Parts List 20-23
SLX Exploded Views & Parts List 24-27
SLX Burner Assembly & Parts List 28-29
Control Panel Exploded View & Parts List 30-31
5,6,8 GPM Pump Assemblies & Parts List 32-33
10 GPM Pump Assembly & Parts List 34
Float Tank Exploded View & Parts List 35
Valve Assemblies & Parts List 36
Hose & Spray Gun Assembly & Parts List 37
Burner Assemblies, Exploded Views and Parts Lists 38-39
Parts Specifications 40-41
LT.1 Pump Exploded View and Parts List 42-43
LX.1 Pump Exploded View and Parts List 44-45
VRT 3 Unloader Exploded View and Parts LIst 46
VBXL Unloader Exploded View and Parts List 47
Warranty

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
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 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.
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.
4. All installations must comply
with local codes. Contact
your electrician, plumber,
utility company or the selling
distributor for specific details.
WARNING
EAR PROTECTION
MUST BE WORN
WARNING: This machine exceeds
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 fly at high speeds. To avoid
personal injury, eye, hand and
foot safety devices must be
worn.
5. Eye, hand, and foot pro-
tection must be worn when
using this equipment.
6. Keep operating area clear of all persons.
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.
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.
WARNING: Risk of fire — Do not
Spray flammable liquids.
7. Allow engine to cool for 1-2 minutes before refu-
eling. 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.

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
OPERATOR’S MANUAL PRESSURE WASHER
4
15. Be certain all quick coupler fittings are secured
before using pressure washer.
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.
16. 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.
17. 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.
18. Avoid installing machines
in small areas or near ex-
haust fans. Adequate ox-
ygen is needed for com-
bustion or dangerous car-
bon monoxide will result.
19. Manufacturer will not be liable for any changes
made to our standard machines or any components
not purchased from us.
20. 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.
IMPORTANT SAFETY INFORMATION
In an overfilling 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 flammable
objects as the engine is hot.
9. 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.
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.
11. Do not confuse gasoline and fuel oil tanks. Keep
proper fuel in proper tank.
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. 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.
CAUTION: 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.
13. 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.
14. Never make adjustments on
machine while in operation.

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
5
PRESSURE WASHER OPERATOR’S MANUAL
IMPORTANT SAFETY INFORMATION
21. Do not allow acids, caustic or abrasive fluids to pass
through the pump.
22. Never run pump dry or leave spray gun closed
longer than 1-2 minutes.
23. Machines with shut-off spray gun should not be
operated with the spray gun in the off position for
extensive periods of time as this may cause dam-
age to the pump.
24. Protect discharge hose from vehicle traffic and
sharp objects. Inspect condition of high pressure
hose before using or bodily injury may result.
25. 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.
26. Do not overreach or stand on unstable support.
Keep good footing and balance at all times.
27. Do not operate this machine when fatigued or under
the influence of alcohol, prescription medications,
or drugs.
28. 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.
Follow the maintenance instructions speci-
fied in the manual.

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
OPERATOR’S MANUAL PRESSURE WASHER
6
COMPONENT IDENTIFICATION
Pump — Delivers a specific gpm to the high pressure
nozzle which develops pressure.
Spray Gun — Controls the application of water and
detergent onto cleaning surface with trigger device.
Includes safety latch.
Detergent 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.
Generator — Provides 110V power to the burner
assembly.
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.
Water Inlet
Wand
Generator
High
Pressure
Hose

Rupture Disk
Pump
Unloader
Detergent
Valve
Thermostat
Volt
Meter
High
Pressure
Nozzles
Spray
Gun

Pump

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
7
PRESSURE WASHER OPERATOR’S MANUAL
ASSEMBLY INSTRUCTIONS
STEP 1: Attach a 5/8" water supply
hose to inlet connector. Minimum
flow should be 10 GPM depending
on model of machine.
STEP 3: Attach variable pressure
control wand to spray gun using
teflon tape on threads to prevent
leakage.
STEP 7: Check oil level by using
supplied dip-stick. Use SAE 30W
non-detergent only.
STEP 2: Attach high pressure hose
to discharge nipple using quick cou-
pler. Lock coupler securely by pull-
ing back coupler collar, inserting
onto discharge nipple and pushing
collar forward until secure.
STEP 8: Fill fuel oil tank. Do not
confuse gasoline and fuel oil tanks.
Keep proper fuel in proper tank.
STEP 5: Before installing nozzle, turn
on water supply and run machine
allowing water to flush through the
system until clear. Pull the spring-
loaded collar of the wand coupler collar
back to insert your choice of pressure
nozzle. CAUTION: Never replace
nozzles without engaging the safety
latch on the spray gun trigger.
STEP 9: Install proper battery
making sure that the red cable is
attached to the positive terminal.
Use a 12V group 24 style battery.
Garden
Hose
Water
Inlet
89140030-5
High
Pressure
Hose
Discharge
Nipple
Trigger
Gun
Pressure
Nozzle
Dipstick
Collar
Wand
Safety Latch
STEP 4: Attach the high pressure
hose to the spray gun using teflon
tape on hose threads.
High
Pressure
Hose
Spray Gun
STEP 6: Release the coupler collar
and push the nozzle until the collar
clicks. Pull the nozzle to make sure
it is seated properly.
Coupler
Collar
Pressure
Nozzle
Oil
Tank
Coupler
Collar

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
OPERATOR’S MANUAL PRESSURE WASHER
8
OPERATING INSTRUCTIONS
STEP 1: Read engine warning and
operating instructions prior to turn-
ing on the water. Check for water
leaks; tighten as needed.
STEP 2: Read engine manual pro-
vided. The keyed ignition is located
on the control panel. Simply turn key
to first position. Glow plug light will
illuminate. When light goes out, turn
key to start (second) position.
STEP 4: For hot water, turn the
thermostat knob to 210° then push
the burner switch to ON when a
steady stream of water flows out of
the spray gun. Burner will now light
automatically. NOTE: Do not start
machine with burner switch on.
STEP 3: With the spray nozzle
pointed away from you or anybody
else, press the trigger on the spray
gun to obtain pressurized cold water
spray.
STEP 5: For steam, open the
steam valve counterclockwise. This
lowers the pressure and raises the
temperature.
Engine
Key
Switch
STEP 6: The four color-coded quick connect nozzles
provide a wide array of spray widths from 0° to 45° and
are easily accessible when placed in the convenient
rubber nozzle holder, which is provided on the front of
the machine. NOTE: For a more gentle rinse, select the
white 40° or green 25° nozzle. To scour the surface,
select the yellow 15° or red 0° nozzle.
Nozzles
Burner
Switch
STEP 7: Position valve handles as shown in diagram 1
for float tank operation and as shown in diagram 2 for
external water tank operation.
Valve
Handles
Valve
Handles
Diagram 1 Diagram 2
Detergent
Valve
Steam
Valve
Thermostat
Adjust Knob

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
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 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
filter end of detergent suction tube
into the detergent container.
STEP 2: With the engine run-
ning, 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 after each use by placing the
suction tube into a bucket of clean water, open
detergent valves then run the pressure washer
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
damage the surface being cleaned.
RINSING
It will take a few seconds for the detergent to clear.
Apply safety latch to spray gun and close detergent
valve. Select and install the desired high pressure
nozzle.
WARNING
DETERGENTS & GENERAL WASHING TECHNIQUES
Detergent Tube
Detergent Valve

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
OPERATOR’S MANUAL PRESSURE WASHER
10
SHUTTING DOWN AND CLEAN-UP
CAUTION: Always store your pressure washer in a
location where the temperature 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 re-
maining water exits. Turn engine off immediately.
4. Drain the fuel 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.
CAUTION: Failure to follow the above directions will
result in damage to your pressure washer.
When the pressure washer is not being operated or is
being stored for more than one month, follow these
instructions:
1. Replenish engine oil to upper level.
2. Drain diesel from fuel tank, fuel line, fuel valve and
carburetor.
3. Pour about one teaspoon of engine oil through the
spark plug hole, pull the starter grip several times
and replace the plug. Then pull the starter grip
slowly
until you feel increased pressure which indicates
the piston is on its compression stroke and leave
it in that position. This closes both the intake and
exhaust valves to prevent rusting of cylinder.
4. Cover the pressure washer and store in a clean, dry
place that is well ventilated away from open flame
or sparks. NOTE: The use of a fuel additive, such
as STA-BIL®, or an equivalent, will minimize the
formulation of fuel deposits during shortage. Such
additives may be added to the gasoline in the fuel
tank of the engine, or to the gasoline in a storage
container.
After Extended Storage
CAUTION: Prior to restarting, thaw out any
possible ice from pressure washer hoses,
spray gun or wand.
Engine Maintenance
During the winter months, rare atmospheric conditions
may develop which will cause an icing condition in the
carburetor. If this develops, the engine may run rough,
lose power and may stall. This temporary condition can
be overcome by deflecting some of the hot air from the
engine over the carburetor area. NOTE: Refer to the
engine manufacturer's manual for service and mainte-
nance of the engine.
STORAGE
STEP 2: Turn burner switch off and
continue spraying, allowing the wa-
ter to cool to below 100°.
STEP 3: Turn engine key switch
off.
STEP 1: Remove detergent suction
tube from container and insert into
one gallon of fresh water. Open
detergent valve, pull trigger on
spray gun and siphon water for one
minute.
Burner
Switch
STEP 5: Squeeze trigger on spray
gun to relieve remaining pressure.
STEP 4: Turn off water supply.
Engine
Key
Switch

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
11
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
LOW OPERATING
PRESSURE
Faulty pressure gauge Install new gauge.
Insufficient water supply Use larger supply hose; clean filter 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 teflon 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.
Leaking pressure control valve Rebuild or replace as needed.
Slow engine RPM Set engine speed at proper specifications.
Gasoline Engine Altitude The gasoline engine is preset for operation at
altitudes below 1000 feet above sea level. If
operated at higher altitudes, it may be necessary
to install a high altitude main jet in the carburetor.
Contact your local authorized engine sales and
service center for details.
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
(Continued on
next page)
Little or no fuel Fill tank with fuel.
Improper fuel or water in fuel Drain fuel tank and fill with proper fuel.
Clogged fuel line Clean or replace.
Plugged fuel filter Replace as needed.
Misadjusted burner air bands Replace air bands for clean burn.
Little or no fuel pressure from
fuel pump
Increase fuel pressure to specifications and/or
replace fuel pump. Test with pressure gauge.
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 wires.
Flex coupling slipping on fuel
pump shaft or burner motor shaft
Replace if needed.
On-Off switch defective Check for electrical current reaching burner
assembly with burner switch on.
Heavy sooting on coil and burner
can cause interruption of air flow
and shorting of electrodes
Clean as required.
Improper electrode setting Check and reset according to diagram in
Operator’s Manual

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
PRESSURE WASHER Troubleshooting Guide
12
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
BURNER WILL
NOT LIGHT
(continued from
previous page)
Fuel reaching combustion chamber Check fuel pump for proper flow. Check
solenoid flow switch on machines with spray
gun control, for proper on-off fuel flow 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.
Gasoline Engine Altitude The gasoline engine is preset for operation at
altitudes below 1000 feet above sea level. If
operated at higher altitudes, it may be neces-
sary to install a high altitude main jet in the
carburetor. Contact your local authorized engine
sales and service center for details.
MACHINE
SMOKES
Improper fuel or water in fuel Drain tank and replace contaminated fuel.
Improper air adjustment Readjust air bands on burner asssembly.
Low fuel pressure Adjust fuel pump pressure to specifications.
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.
Obstruction in smoke stack Check for insulation blockage or other foreign
objects.
Low engine RPM Increase RPM.
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 filter partially clogged Replace as needed.
Soot build-up on coils not allowing heat
transfer
Clean coils.
Improper burner nozzle See specifications.
WATER
TEMPERATURE
TOO HIGH
Incoming water to machine warm or hot Lower incoming water temperature.
Fuel pump pressure too high See specifications 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 See specifications for proper fuel pressure.

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
13
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
WATER
TEMPERATURE
TOO HIGH
Insufficient water supplied Check water GPM to machine.
Restrict water flow 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 5 minutes.
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 float tank is missing Replace restrictor. Check for
proper orifice 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 specifications.
Hole in detergent line(s) Repair hole.
Low detergent level Add detergent, if needed.
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/
RUPTURE DISK
LEAKS WATER
Excessive pressure, thermal
expansion
Replace or repair

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
OPERATOR’S MANUAL PRESSURE WASHER
14
MAINTENANCE & SERVICE
PREVENTATIVE
MAINTENANCE
Check to see that water pump is properly lubricated.
• Follow winterizing instructions to prevent freeze
damage to pump and coils.
• Always neutralize and flush detergent from system
after use.
• If water is known to be high in mineral content, use
a water softener on your water system, or de-scale
as needed.
• Do not allow acidic, caustic or abrasive fluids to
be pumped through system.
• Always use high grade quality cleaning products.
• Never run pump dry for extended periods of time.
• Use clean diesel fuel. Clean or replace fuel filter
every 100 hours of operation. Avoid water con-
taminated fuel as it will damage the fuel pump.
• If machine is operated with smoky or eye burning
exhaust, coils soot up and prevent water from
reaching maximum operating temperature. (See
section on Burner Adjustments.)
• Never allow water to be sprayed on or near the
engine or burner assembly or any electrical com-
ponent.
• Periodically delime coils per instructions.
• Check to see that engine is properly lubricated.
It is advisable, periodically, to visually inspect the
burner. Check air inlet to make sure it is not clogged
or blocked. Wipe off any oil spills and keep this equip-
ment clean and dry.
The flow of combustion and ventilating air to the burner
must not be blocked or obstructed in any manner.
The area around the Landa washer should be kept
clean and free of combustible materials, gasoline and
other flammable vapors and liquids.
Unloader Valves
Unloader valves are preset and tested at the factory
before shipping. Tampering with the factory setting
may cause personal injury and/or property damage,
and will void the manufacturer's warranty.
Winterizing Procedure
Damage due to freezing is not covered by warranty.
Adhere to the following cold weather procedures when-
ever the washer must be stored or operated outdoors
under freezing conditions.
During winter months, when temperatures drop be-
low 32°F, protecting your machine against freezing
is necessary. 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 float tank. Turn the engine on
to siphon the antifreeze mixture through the machine.
If compressed air is available, an air fitting can be
screwed into the float tank by removing the float tank
strainer and fitting. 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 off until the water
cools then automatically reset itself. The thermostat
sensor is located on the discharge side of the heat-
ing coil. The thermostat control dial is located on the
control panel.
Pumps
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 the red dot visible through the oil gauge
window. Oil should be maintained at that level.
Cleaning of Coils
In alkaline water areas, lime deposits can accumulate
rapidly inside the heating coil. This growth is increased
by the extreme heat build up in the coil. The best pre-
vention for liming conditions is to use high quality
cleaning chemicals. In areas where alkaline water is
an extreme problem, periodic use of Landa Deliming
Powder (Landa Part #9-028008) will remove lime and
other deposits before coil becomes plugged.
Deliming Coils
Periodic flushing of coils or optional float tank is rec-
ommended.
Step 1 Fill a container with 4 gallons of water, then
add 1 lb. of deliming powder. Mix thoroughly.
Pour mixture into float tank.
Step 2 Remove wand assembly from spray gun
and put spray gun into float tank. Secure
the trigger on the spray gun into the open
position.
Step 3 Turn engine on, allowing solution to be
pumped through coils back into the float
tank. The solution should be allowed to cir-
culate 2-4 hours or until the color changes.
Step 4 After circulating solution, flush the entire sys-
tem with fresh water. Clean out float tank and
then reinstall wand assembly to spray gun.

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
15
PRESSURE WASHER OPERATOR’S MANUAL
Removal of Soot and Heating Coil
In the heating process, fuel residue in the form of
soot deposits may develop on 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 (See Coil Removal page 16).
Pressure Relief Valve
Each machine is equipped with a relief valve to relieve
pressure in the system when higher than normal op-
erating pressures are encountered or if the unloader
valve should fail. Unusually high pressures come from
an object plugging the spray nozzle. If operating pres-
sure is found to be normal and the relief valve continues
to leak, repair or replace valve. CAUTION: This valve
must be opened each year to check operation.
Rupture Disk
If pressure from pump or thermal expansion should
exceed safe limits, the rupture disk will burst, allow-
ing high pressure to be discharged through hose to
ground. The ruptured disk needs to be inspected once
or twice a year for any obstructions.
Fuel
Use clean fuel oil/diesel that is not contaminated with
water and debris. Replace fuel filter and drain tank
every 100 hours of operation.
Use No. 1 or No. 2 heating oil (ASTM D306) only.
NEVER use gasoline in your burner fuel 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.
Fuel Control System
This machine utilizes a fuel solenoid valve located on
the fuel pump to control the flow of fuel to the combus-
tion chamber. The solenoid, which is normally closed,
is activated by a flow switch when water flows through
it. When the operator releases the trigger on the spray
gun, the flow of water through the flow switch stops,
turning off the electrical 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 gives an instantaneous burn-or-no-
burn situation, thereby eliminating high and low water
temperatures, and combustion smoke normally asso-
ciated with machines incorporating a spray gun.
CAUTION: Periodic inspection, to insure that the
fuel solenoid valve functions properly, is recom-
mended. This can be done by operating the ma-
chine and checking to see that the burner is not
firing when the spray gun is in the off position.
MAINTENANCE & SERVICE
Fuel Pressure Adjustment
To control water temperature, adjust fuel pressure
by turning the regulating pressure adjusting screw
clockwise to increase, counterclockwise to decrease.
Do not exceed 200 psi. NOTE: When changing fuel
pump, a bypass plug must be installed in return port
or fuel pump will not prime.
ELECTRODE SETTING: WAYNE
ELECTRODE SETTING: BECKETT
1/8"
3/8"
3/16"
1/2" 2-7/8"
Nozzle
Adapter
Top View Side View
Periodically check wiring connections. If necessary to adjust
electrodes use diagram.
Gap
Electrodes
1/8"
5/32" Gap
1/16"
Nozzle
Electrode
7/16"

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
OPERATOR’S MANUAL PRESSURE WASHER
16
MAINTENANCE & SERVICE
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.
Air Adjustment
The oil burner on this machine is preset for operation
at altitudes below 1000 feet. If operated at higher
altitudes, it may be necessary to adjust the air band
setting. Adjust air band for #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.
Adjustment
To adjust: start machine and turn burner ON. Loosen
two locking screws found in the air shutter openings
(refer to illustration) and close air shutter until black
smoke appears from burner exhaust vent. Note air
band position. Next, slowly open the air shutter until
white smoke just starts to appear. Turn air shutter
halfway back to the black smoke 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.
Coil Removal
Coil removal, 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 the thermostat sensor making
sure you do not crimp the capillary tube.
3. Remove burner assembly from combustion
chamber.
4. Remove the 3-3/8" bolts from each side of coil and
tank assembly (these bolts are used to fasten tank
to chassis).
5. Remove fittings connected to the 1/2" pipe nipples
from inlet and discharge sides of coil.
6. Remove top tank wrap, bend back insulation tabs
and fold back blanket.
7. Remove bolts that hold down coil to
bottom wrap.
8. Remove coil.
9. Replace or repair the coil and any insulation found
to be broken or torn.
10. Remove insulation retainer plates.
Coil Reinstallation
Reinstall new or cleaned coil reversing Steps 9
through 1.
AIR BAND
LOCKING SCREW
AIR SHUTTER
LOCKING SCREW
AIR SHUTTER
LOCKING SCREW
AIR SHUTTER
AIR BAND

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
17
PRESSURE WASHER OPERATOR’S MANUAL
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 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.
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
OIL CHANGE RECORD
MAINTENANCE SCHEDULE
Engine Oil
Inspect Daily
Change Every 25 hours
Filter Every 50 hours
Air Cleaner
Inspect Every 50 hours or monthly
Clean Every 3 months
Battery Level Check monthly
Engine Fuel Filter 500 hours or 6 months
Spark Plug Maintenance 500 hours or 6 months
Clean Fuel Tank(s) Annually
Replace Fuel Lines Annually
Pump Oil
(Non-detergent
10/40W)
Inspect Oil level daily
Change After first 50 hours, then every 500 hours or annually
Clean Burner Filter Monthly (More often if fuel quality is poor)
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 Connects Annually
Clean Water Screen/Filter Weekly
Replace HP Hose Annually

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
OPERATOR’S MANUAL PRESSURE WASHER
18
HOT WATER OUTLET
SALIDA DELAGUA CALIENTE
SORTIE D'EAU CHAUDE
89140030-1
6
EXPLODED VIEW - BURNER ASSEMBLY - SLT
24
17
38
8
11
15
10
16
19
21
39
13
22
23
9
7
16
19
1
5
4
2
3
20
12
14
18
40
41
27
28
29
26
25
30
32
31
34
33
35
36
37
From
Unloader

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
19
PRESSURE WASHER OPERATOR’S MANUAL
SLT BURNER ASSEMBLY PARTS LIST
ITEM PART NO. DESCRIPTION QTY
1 8.706-958.0 Hose Barb, 1/4" Barb x 1/4"
Pipe, 90° 1
2 8.709-158.0 Filter, Fuel/H20 Separator 1
3 8.706-941.0 Hose Barb, 1/4" Barb x 1/4"
ML Pipe 1
4 8.706-827.0 Elbow, 1/4" Street 1
5 9.803-264.0 Nipple, 1/4" x 3, Black Pipe 1
6 8.717-102.0 Burner, CF800, 120V, 4.5
Nozzle, 140 PSI
(8-30824E) 1
8.717-378.0  Nozzle, 3.25, 80°B,
(6-32824E) 1
8.750-777.0 Burner, Oil, 115V Cap
(5-30824E) 1
8.717-366.0  Nozzle 2.50, 90° B,
(5-30824E) 1
7 9.802-014.0 Nipple, 1/2" x 3",
Galvanized,SCH80 2
8 8.725-944.0 Disk, Rupture 8000# 1
9 9.802-043.0 Elbow, 1/2" JIC x 1/2"
Female, 90° 1
10 8.706-141.0 Coupling, 1/2" Hex Pipe 1
11 8.706-248.0 Plug, 3/8" Allen
Counter Sunk 1
12 8.717-474.0 Insulation, Tank Head 24"
w/Hole 1
13 8.717-475.0 Insulation, Tank Head 24" 1
14 8.717-476.0 Insulation, 1 Cut Blanket 1
15 9.802-171.0 Nipple, 3/8" x 3/8",
NPT ST Male 1
ITEM PART NO. DESCRIPTION QTY
16 8.912-220.0 Insulation Retainer Plate 2
17 8.912-449.0 Wrap, Bottom, 24" 1
18 8.912-736.0 Assembly, Coil SLT Skid 1
19 8.933-009.0 Gasket, Burner Plate 2
20 8.912-467.0 Top Wrap 1
21 9.196-012.0 Screw, 10-24 x 1/4" 1
22 9.802-041.0 Elbow, 3/8" Street 45° 1
23 9.149-003.0 Manifold Coil Outlet
Discharge 1
24 4-02110000 Hose, Push-On 1 ft.
25 8.716-547.0 Connector, Conduit 1
26 8.716-011.0 Conduit 19"
27 8.918-424.0 Hose, 3/8" x 25" 2 Wire,
Pressure Loop (5-3000,
6-3200) 1
8.918-225.0 Hose, 1/2" x 28" 2 Wire
(8-3000) 1
28 9.802-047.0 Adapter, 1/2" x 1/2" 1
29 9.803-541.0 Screw, 5/16"-18 x 1/2" CS
SOC, BN, NC, ZN 10
30 9.802-776.0 Washer, 5/16" Flat 10
31 8.706-236.0 Tee, 1/2" Street 1
32 8.706-171.0 Elbow, 1/2" Pipe x 3/8" 1
33 8.707-376.0 Valve, Safety Relief,
4500 PSI 1
34 9.802-202.0 Clamp, Screw 1
35 9.802-262.0 Hose, 7/8" Push-On 4 ft.
36 9.800-021.0 Label, Hot Water Outlet 1
37 9.184-030.0 Spacer, Rupture Disc 1
38 8.707-019.0 Push-On, 1/2" Barb x 3/8"
MPT 1
39 8.750-095.0 Thermostat, 120C/240°F 1
40 9.802-768.0 Screw, 3/8 x 11/4 2
41 9.802-781.0 Nut, 3/8" NC 2

Landa SLT/SLX Diesel • 8.914-003.0 • Rev. 12/11
OPERATOR’S MANUAL PRESSURE WASHER
20
IGNITION
IGNICION/IGNITTION
TEMPERATURE
TEMPERTURA/TEMPERATURE
HOUR METER
HOROMETRO/CHRONOMETRE
BURNER
QUEMADOR/BRULEUR
VOLTMETER
VOLTIMETRO/VOLTMETRE
GREEN 25°
YELLOW 15°
RED 0° WHITE 40°
0
165
130
95
235
120 Volts
CHAUD!
+–
+–
CAUTION
Never Use
:
• Bleach, chlorine products and other corrosive chemicals
• Liquids containing solvents (i.e. paint thinner,gasoline,oil)
• Tri-sodium phosphate products
• Ammonia products
• Acid-based products
These chemicals will harm the unit and will damage the
surface being cleaned.
Use manufacturer's detergents as recommended in manual
89140030-3
EXPLODED VIEW - SLT
25
26
7
1
13
11
26
9
8
17
16
15
14
24
4
23
2
22
5
81
49
52,57,80
49
53
54
56
68
67
55
54
78
1
85
81
1
60
50
52 57
61
For Detail
See Float
Tank Illus.
For Detail
See Valve
Assembly
Illus.
For
Detail See
Control
Panel
Illus.
83
84
86
49
59
74
6
87
Reversed
Views of
Labels
69
79
82
60
40 - Inlet
to Engine
20 - Inlet
to Burner
12 - Return
from Engine
97 - Return
from Burner
92
89
97
92
93
95
60
4
4
96
42