Landa MVC4-3000 - Troubleshooting Pump and Motor Issues

96-61836 • LANDA MVC • REV. 11/04
17
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
DETERGENT NOT
DRAWING
Air is leaking Tighten all clamps. Check detergent lines for holes.
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.
Filter screen on detergent
suction hose is plugged
Clean or replace.
Detergent has high viscosity Dilute detergent to specifications.
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.
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.
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