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
22
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
WATER
ESCAPING
FROM FILL
PIPE ON HEAT
EXCHANGER
Cold water added to heat exchanger Will stop once at
operating temperature.
Ruptured coil or leaking
Check, repair or replace fi ttings.
UNLOADER
DOES NOT GO
INTO BYPASS
OR WILL
CYCLE ITSELF
Spray gun or hose is leaking to
atmosphere
Check and repair all leaks.
Check plunger either did not move
or did not seal
Remove discharge port. Clean
and inspect the check plunger.
Replace the o-ring if needed.
Actuator O-ring failure
Remove actuator plunger assembly
and inspect O-ring and back-up rings.
Replace if necessary.
SPIKES
TOO HIGH
Slow moving actuator; this may be
caused by bad O-rings either on the
plunger or inside the actuator fi tting
Remove the actuator assembly to
inspect the O-ring and back-up rings.
The actuator assembly will have to be
disassembled to inspect and/or replace
the O-rings in the actuator fi tting.
Spring tension
Adjustment should stop when
pressure is no longer affected by
further compression of the spring.
Hose length
Hose length can affect the amount of
spike pressure. Long lengths of hose
may cause high spike pressures.
SYSTEM WON’T
COME UP TO
PRESSURE
Water is leaking between ball and
seat
Disassemble inlet fi tting and check for
contaminates or worn parts. Clean or
replace as needed.
O-rings on actuator plunger are bad
Remove actuator assembly
and inspect O-ring and back-up
rings. Replace if necessary.
Locknut may be improperly set
Readjust locknut.
NOTE: The locknut is inside
the spring on models that have
the stem exposed above the spring.
Tip/GPM combination is incorrect
Check actual GPM on unrestricted
pump and size tip accordingly.
Tip worn- the GPM may be greater
than expected with a worn tip
Replace tip.
Bad gauge - the pressure may be
higher than the gauge shows
Replace gauge.