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Troubleshooting; Karcher Hd; Pump - Kärcher HD 2.8/10 ST Ed B Operator's Manual

Hd series cold water - electric powered
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Troubleshooting

PROBLEM
PUMP RUNNING
NORMALLY
BUT PRESSURE
LOW ON
INSTALLATION
FLUCTUATING
PRESSURE
PRESSURE
LOW AFTER
PERIOD OF
NORMAL USE

PUMP

NOISY
PRESENCE OF
WATER IN
PUMP OIL
WATER DRIPPING
FROM UNDER PUMP
OIL DRIPPING
FROM PUMP
EXCESSIVE
VIBRATION IN HIGH
PRESSURE HOSE
MOTOR WILL
NOT RUN
MACHINE WILL
NOT TURN ON
WHEN SWITCH
IS PUSHED
POSSIBLE CAUSE
Pump sucking air
Check valves sticking
Unloader valve seat faulty
Nozzle incorrectly sized
Worn piston packing
Valves worn
Blockage in valve
Pump sucking air
Worn piston packing
Insufficient water
Nozzle worn
Suction or delivery valves worn
Suction or delivery valves blocked
Unloader valve seat worn
Unloader adjusted improperly
Worn piston packing
Bypass valve within unloader is
obstructed or leaking
Air in suction line
Broken or weak suction or delivery
valve spring
Foreign matter in valves
Worn bearings
Excessive temperature of water
Oil seal worn
High humidity in air
Piston packing worn
Piston packing worn
O-Ring plunger retainer worn
Oil seal worn
Irregular functioning of the pump
valves
Obstruction in filter
Motor overload
Step down transformer fuses
Coil of magnetic starter defective
Timer is defective
Karcher HD 300-310 Operator's Manual 9.800-086.0 - P
SOLUTION
Check water supply and possibility of air.
Check and clean or 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 clean if necessary.
Check water supply connections.
Check and replace if necessary.
Check filter and hose for breakage.
Check and replace if necessary.
Check and replace if necessary.
Check and clean if necessary.
Check and replace if necessary.
Call local Karcher dealer. Tampering with the
factory setting may cause personal injury and/or
property damage and will void the manufacturer's
warranty.
Check and replace if necessary.
Remove and clean bypass cartridge.
Check water supply and connections on suction
line.
Check and replace if necessary.
Check and clean if necessary.
Check and clean if necessary.
Reduce to below 140°F.
Check and replace if necessary.
Check and change oil twice as often.
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.
Clean inlet filter.
Push in the overload button located on the motor
(single phase) or the overload button
on the magnetic start switch (three phase).
Check fuses and voltage. Replace if necessary.
Replace coil after the timer and unloader
switch have been tested.
Join wires 15 and 16 together on timer.
If machine works, replace timer.
Maintenance
15

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