Landa MHC3-25124 Operator's Manual page 20

Maintenance
PROBLEM
Injector head may be blocked, dirty
DETERGENT
or damaged.
NOT
DRAWING
Not using soap nozzle
CONT.
Detergent level is low
Pump is sucking air
PUMP
Valves are sticking
RUNNING
NORMALLY BUT
Unloader valve seat is faulty
PRESSURE
LOW ON
Nozzle sized incorrectly
INSTALLATION
Packing piston is worn
Valves are worn
Valve has a blockage
Pump is sucking air
FLUCTUATING
Packing piston is worn
PRESSURE
Gasoline Engine Altitude
Air is in suction line
Inlet or discharge valve springs are
PUMP
weak or broken
NOISY
Excessive matter is in valves
Bearings are worn
Piston packing is worn
O-Ring plunger retainer is worn
WATER
DRIPPING FROM
Piston is cracked
UNDER PUMP
Pump protector is worn
OIL
Oil seal is worn
DRIPPING
EXCESSIVE
VIBRATION Valves are functioning irregularly
IN DELIVERY LINE
Fuel pump has seized
BURNER Burner fan loose or misaligned
MOTOR
Control switch is defective
WILL
NOT RUN
There is a loose wire
Burner motor is defective
RELIEF VALVE
Relief valve is defective
LEAKS WATER
20
POSSIBLE CAUSE
Landa MHC 9.800-950.0 - V
SOLUTION
Clean and make sure ball and spring behind detergent hose
barb or injector body are working properly.
Insert soap nozzle into wand coupler.
Add detergent if needed.
Check water supply and possibility of air seepage.
Check and clean or replace if necessary.
Check and replace if necessary.
Check and replace if necessary
(see serial plate for proper size).
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check water supply and air seepage at joint in suction line.
Check and replace if necessary.
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.
Check water supply and connections on suction line.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Lower water supply pressure. Do not run the spray gun
closed longer than 5 minutes.
Check and replace if necessary.
Check and replace if necessary.
Replace fuel pump.
Position correctly and tighten set screw.
Replace switch.
Check and replace or tighten wiring.
Replace motor.
Replace or repair relief valve.