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
