23
Maintenance
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
ON INSTALLATION
Pump sucking air
Check water supply and possibility of air
seepage.
Valves sticking
Check and clean or replace if necessary.
Nozzle incorrectly sized
Check and replace if necessary (See serial
plate for proper size).
Unloader valve seat faulty
Check and replace if necessary.
Worn piston packing
Check and replace if necessary.
BURNER MOTOR
WILL NOT RUN
Fuel pump seized
Replace fuel pump.
Burner fan loose or misaligned
Position correctly, tighten set screw.
Defective control switch
Replace switch.
Loose wire
Check and replace or tighten wiring.
Defective burner motor
Replace motor.
RELIEF VALVE
LEAKS WATER
Relief valve defective
Replace or repair
Problem
Possible Cause
Solution
Karcher Trailer 3500E HDS 4.7/35 Operator’s Manual 9.808-363.0 - B
