Karcher Shark HDS 4.0/20 E Ec Service Manual - Troubleshooting
9.800-966.0-R • KÄRCHER HDS Service Manual
PRESSURE
W
ASHER
T
roub
leshooting Guide
20
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW
OPERATING
PRESSURE
Faulty pressure gauge
Install new gauge.
Insuffi cient water supply
Use larger garden hose; clean fi lter
washer at water inlet.
Old, worn or incorrect spray nozzle
Match nozzle number to machine
and/or replace with new nozzle.
Plumbing or hose leak
Check plumbing system for leaks.
Retape leaks with tefl on tape.
Faulty or mis-adjusted unloader valve
(where applicable)
Adjust unloader for proper pressure.
Install repair kit when needed.
Worn packing in pump
Install new packing kit.
Fouled or dirty inlet or discharge
valves in pump
Clean inlet and discharge valves.
Worn inlet or discharge valves
Replace with valve kit.
Leaking pressure control valve
(where applicable)
Rebuild or replace as needed.
FLUCTUATING
PRESSURE
Valves worn
Check and replace if necessary.
Blockage in valve
Check and clean out if necessary.
Pump sucking air
Check water supply and suction
line for air seepage at joints.
Worn piston packing
Check and replace if necessary.
PRESSURE
LOW AFTER
PERIOD OF
NORMAL USE
Nozzle worn
Check and replace if necessary.
Inlet or discharge valves blocked or
worn
Check and clean or replace if necessary.
Unloader valve seat worn
Check and replace if necessary.
PUMP NOISY
Air in suction line
Check water supply connections on
suction line.
Broken or weak inlet or discharge
valve springs
Check and replace if necessary.
Foreign matter in valves
Check and clean if necessary.
Worn bearings
Check and replace if necessary.
PRESENCE
OF WATER
IN PUMP OIL
Water sprayed at machine
Change oil. Direct spray away from
machine.
High humidity in air
Check and change oil twice as often.
Piston packing worn. Oil seal worn
Check and replace if necessary.