Karcher Shark HDS 4.0/20 E Ec, Service Manual, Page: 21 / 26

9.800-966.0-R • KÄRCHER HDS Service Manual
21
PRESSURE
W
ASHER
T
roub
leshooting Guide
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
OIL SQUIRTS
OUT OF OIL
CAP ON PUMP Pump overfi lled 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 water 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 fi ll.
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
PRESSURE 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.