22
Maintenance
PROBLEM
POSSIBLE CAUSE
SOLUTION
DETERGENT
NOT
DRAWING
CONT.
Injector head may be blocked, dirty
or damaged.
Clean and make sure ball and spring behind detergent hose
barb or injector body are working properly.
Not using soap nozzle
Insert soap nozzle into wand coupler.
Detergent level is low
Add detergent if needed.
PUMP
RUNNING
NORMALLY BUT
PRESSURE
LOW ON
INSTALLATION
Pump is sucking air
Check water supply and possibility of air seepage.
Valves are sticking
Check and clean or replace if necessary.
Unloader valve seat is faulty
Check and replace if necessary.
Nozzle sized incorrectly
Check and replace if necessary
(see serial plate for proper size).
Packing piston is worn
Check and replace if necessary.
FLUCTUATING
PRESSURE
Valves are worn
Check and replace if necessary.
Valve has a blockage
Check and replace if necessary.
Pump is sucking air
Check water supply and air seepage at joint in suction line.
Packing piston is worn
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 alti
-
tudes, it may be necessary to install a high altitude main jet
in the carburetor. Contact your local authorized engines
sales and service center for details.
PUMP
NOISY
Air is in suction line
Check water supply and connections on suction line.
Inlet or discharge valve springs are
weak or broken
Check and replace if necessary.
Excessive matter is in valves
Check and replace if necessary.
Bearings are worn
Check and replace if necessary.
WATER
DRIPPING FROM
UNDER PUMP
Piston packing is worn
Check and replace if necessary.
O-Ring plunger retainer is worn
Check and replace if necessary.
Piston is cracked
Check and replace if necessary.
Pump protector is worn
Lower water supply pressure. Do not run the spray gun
closed longer than 5 minutes.
OIL
DRIPPING
Oil seal is worn
Check and replace if necessary.
EXCESSIVE
VIBRATION
IN DELIVERY LINE
Valves are functioning irregularly
Check and replace if necessary.
BURNER
MOTOR
WILL
NOT RUN
Fuel pump has seized
Replace fuel pump.
Burner fan loose or misaligned
Position correctly and tighten set screw.
Control switch is defective
Replace switch.
There is a loose wire
Check and replace or tighten wiring.
Burner motor is defective
Replace motor.
RELIEF VALVE
LEAKS WATER
Relief valve is defective
Replace or repair relief valve.
Landa MHC 9.800-950.0 - BM