18
Maintenance
PROBLEM
POSSIBLE CAUSE
SOLUTION
OIL SQUIRTS OUT OF OIL CAP
ON PUMP
Pump overfilled with oil
Maintain oil level at red dot on sight
glass at rear of pump or at top of
notch on dipstick
(where applicable).
WATER DRIPPING FROM
UNDER PUMP
Piston packing worn
Check and replace if necessary.
O-Ring plunger retainer worn
Check and replace if necessary.
Cracked piston
Check and replace if necessary.
OIL DRIPPING
Oil seal worn
Check and replace if necessary.
EXCESSIVE VIBRATION IN
DELIVERY LINE
Irregular functioning of the valves
Check and replace if necessary.
SYSTEM WILL NOT START
Power, water, auto switch not on
Check and turn on.
Motor overload tripped
Check and reset.
Control fuse blown (2 or 3 amp)
Check and replace.
Pressure switch faulty
Check, clean or replace.
Timer faulty
Check and replace.
SYSTEM WILL NOT STOP
Water leak in discharge line
Repair wate
r leak.
Pressure switch faulty
Disconnect at timer. If unit stops,
replace pressure switch.
Timer resistor faulty
Replace timer.
SYSTEM STOPS AFTER
APPROXIMATELY 10 SECONDS
AND THEN RESTARTS
Faulty pressure switch
Check and replace.
Leak in system
Fix leak.
WATER IS NOT HOT
Tank water low
Check for leaks and fill.
Temperature or level controls faulty
Check and replace.
MOTOR ”HUMS” BUT DOES NOT
TURN
Electric motor single phasing
Check for blown fuse or loose power
line connections.
PUMP RUNNING NORMALLY BUT
LOW WATER PRESURE
Air leak in inlet
Check water supply and possibility
of air entering water connections.
Faulty pressure unloader
Bypass pressure unloader by wiring
spray gun open. If good PSI, turn
machine off and replace regulator.
DO NOT RELEASE SPRAY GUN
WHILE BYPASSING UNLOADER.
Karcher HDS Series Operator’s Manual 9.800-967.0 - C
