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Troubleshooting
PROBLEM
LOW OPERATING
PRESSURE
FLUCTUATING
PRESSURE
PRESSURE LOW
AFTER PERIOD OF
NORMAL USE
PUMP NOISY
PRESENCE OF WATER
IN PUMP OIL
POSSIBLE CAUSE
Faulty pressure gauge
Insufficient water supply
Old, worn or incorrect spray nozzle
Plumbing or hose leak
Faulty or misadjusted unloader valve
(where applicable)
Worn packing in pump
Fouled or dirty inlet or discharge valves
in pump
Worn inlet or discharge valves
Leaking pressure control valve (where
applicable)
Valves worn
Blockage in valve
Pump sucking air
Worn piston packing
Nozzle worn
Inlet or discharge valves blocked or
worn
Unloader valve seat worn
Air in suction line
Broken or weak inlet or discharge valve
springs
Foreign matter in valves
Worn bearings
Water sprayed at machine
High humidity in air
Piston packing worn. Oil seal worn
Karcher HDS Series Operator's Manual 9.800-967.0 - C
SOLUTION
Install new gauge.
Use larger garden hose; clean filter washer
at water inlet.
Match nozzle number to machine and/or
replace with new nozzle.
Check plumbing system for leaks.
Retape leaks with teflon tape.
Adjust unloader for proper pressure. Install
repair kit when needed.
Install new packing kit.
Clean inlet and discharge valves.
Replace with valve kit.
Rebuild or replace as needed.
Check and replace if necessary.
Check and clean out if necessary.
Check water supply and suction line for air
seepage at joints.
Check and replace if necessary.
Check and replace if necessary.
Check and clean or replace if necessary.
Check and replace if necessary.
Check water supply connections on
suction line.
Check and replace if necessary.
Check and clean if necessary.
Check and replace if necessary.
Change oil. Direct spray away from
machine.
Check and change oil twice as often.
Check and replace if necessary.
Maintenance
17
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