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#9.800-085.0 • Rev. 01/08
PRESSURE
W
ASHER
Tr
oub
leshooting Guide
10
TROUbLESHOOTINg
PRObLEM
POSSIbLE CAUSE
SOLUTION
PUMP RUNNINg
NORMALLy bUT
PRESSURE LOW ON
INSTALLATION
Pump sucking air
Check water supply and possibility of air.
Check valves sticking
Check and clean or replace if necessary.
Unloader valve seat faulty
Check and replace if necessary.
Nozzle incorrectly sized
Check and replace if necessary.
Worn piston packing
Check and replace if necessary.
fLUCTUATINg PRES-
SURE
Valves worn
Check and replace if necessary.
Blockage in valve
Check and replace if necessary.
Pump sucking air
Check water supply connections.
Worn piston packing
Check and replace if necessary.
Insufficient water
Check filter and hose for breakage.
PRESSURE LOW
AfTER PERIOD Of
NORMAL USE
Nozzle worn
Check and replace if necessary.
Suction or delivery valves worn
Check and replace if necessary.
Suction or delivery lines blocked
Check and clean if necessary.
Unloader valve seat worn
Check and replace if necessary.
Worn piston packing
Check and replace if necessary.
Water temperature excessive
Reduce to below 160° F.
PUMP NOISy
Air in suction line
Check water supply and connections on suc-
tion line.
Broken or weak suction or delivery valve
spring
Check and replace if necessary.
Foreign matter in valves
Check and clean if necessary.
Worn bearings
Check and replace if necessary.
Excessive temperature of water
Reduce to below 160° F.
PRESENCE Of
WATER IN
PUMP OIL
Oil seal worn
Check and replace if necessary.
High humidity in air
Check and replace if necessary.
Piston packing worn
Check and replace if necessary.
WATER DRIPPINg
fROM UNDER PUMP
Piston packing worn
Check and replace if necessary.
O-ring plunger retainer worn
Check and replace if necessary.
WATER DRIPPINg
fROM PUMP
PROTECTOR
Water supply pressure too high (over
90 PSI)
Lower water supply pressure using a regula-
tor.
Spray gun is in the off position for over
5 minutes
Turn machine off if not in use for over 5 min-
utes.
OIL DRIPPINg
Oil seal worn
Check and replace if necessary.
ExCESSIvE
vIbRATION IN HIgH
PRESSURE HOSE
Irregular functioning of the pump
valves
Check and replace if necessary.
MOTOR DOES
NOT START WHEN
SWITCHED ON
Plug not well connected or lack of power
supply
Check plug, cable and switch.
WHEN SWITCHINg
ON THE MACHINE,
MOTOR HUMS bUT
DOES NOT RUN
Main voltage is insufficient lower than
the minimum required
Check to make sure main power supply is
adequate.
The pump is stuck or frozen
Check by turning the motor manually.
MOTOR STOPS
Tripped thermal overload due to over-
heating
Check that main voltage corresponds to the
specifications. Wait a few minutes before turn-
ing on the machine again by resetting the GFCI
cord.