20
Maintenance
Troubleshooting
PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW
OPERATING
PRESSURE
Water supply is insufficient
Use larger supply hose; clean filter at water inlet.
Spray nozzle is old, worn or incorrect
Match the nozzle number to the machine and/or
replace with new nozzle.
Belt slips
Tighten or replace belt; use correct belt.
Plumbing or hose is leaking
Check plumbing system for leaks. Re-tape leaks with
teflon tape.
Unloader is faulty or mis-adjusted
Adjust unloader for proper pressure. Install repair kit
when necessary or replace.
Packing in pump is worn
Install new packing kit.
Discharge valve in pump or inlet is fouled
or dirty
Check inlet and discharge valve.
Discharge valve or inlet is worn
Replace with valve kit.
Spray nozzle has obstruction
Remove obstruction.
Steam pressure control valve is leaking
(where applicable)
Rebuild or replace as necessary.
Engine RPM is slow
Set engine speed at proper specifications. See serial
plate. 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 you
local authorized engine sales and service center for
details.
BURNER WILL
NOT LIGHT
There is little or no fuel
Fill tank with fuel.
Improper fuel or water in fuel
Drain fuel tank and fill with proper fuel.
Fuel line is clogged
Clean or replace fuel line.
Fuel filter is plugged
Replace fuel filter as needed.
Burner air bands are mis-adjusted
Readjust air bands for clean burn.
Little or no fuel pressure from fuel pump Increase fuel pressure to specification and/or replace
fuel pump.
Burner transformer is faulty
Test transformer for proper arc between contacts.
Replace as needed.
Electrical wiring is disconnected or has
short in it
All wire contacts should be clean and tight with no
breaks in wire.
Flex coupling is slipping on fuel pump
shaft or burner motor shaft
Replace if needed.
ON-OFF switch is defective
Check for electrical current reaching burner assembly
with burner switch on. Replace switch if needed.
Heavy sooting on coil and burner can
cause interruption of air flow and shorting
of electrodes
Clean as required.
Electrode setting is improper
Check and reset according to diagram in manual.
30 amp circuit breaker tripped
Push in reset button.
Bridge rectifier defective
Test and replace.
12V DC relay defective
Test and replace.
Fuel is not reaching combustion chamber
Check fuel pump for proper flow. Check solenoid flow
switch on machines with spray gun control for proper
on-off flow control.
Landa MHC 9.800-950.0 - BM
