19
Maintenance
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 necessary to
install a high altitude main jet in the carburetor.
Contact your local authorized engine sales and
service center for details.
MACHINE
SMOKES
WHILE
BURNER UNIT
IS RUNNING
OR
UNIT SMOKES AT
COLD-START
ONLY WHEN
BURNER IS OFF
Fuel is improper or water is in fuel
Drain tank and replace contaminated fuel
Air adjustment is improper
Readjust air bands on burner assembly
Fuel pressure is low <140 psi for
burner
Adjust fuel pump pressure to specifications
Plugged or dirty burner nozzle
Replace nozzle Check parts breakdown
for nozzle size.
Faulty burner nozzle spray pattern
Replace nozzle Check parts breakdown
for nozzle size
Coil and burner assembly have heavy
accumulation of soot
Remove coils and burner assembly,
clean thoroughly Call local dealer.
Smoke stack has obstruction
Check for insulation blockage or other foreign
objects
Engine RPM is low
Increase RPM to correct specs. See serial plate.
Fuel Pressure is too high for clean
burn (fuel PSI above >140 and below
200) and smokes when burner is off
Reduce fuel pressure PSI/Increase air band set for
cleaner without max water heat loss
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.
Landa SLT/SLX Gas Operator’s Manual 8.914-002.0 - AR
