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8.914-000.0, 8.917-410.0, 9.800-340.0 • Rev. 03/10
9
PRESSURE W
ASHER
T
roub
leshooting
Guide
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
ON INSTALLATION
Pump sucking air
Check water supply and possibility of air
seepage.
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
PRESSURE
Valves worn
Check and replace if necessary.
Blockage in valve
Check and clean out if necessary.
Faulty or misadjusted
unloader valve
Tampering with the factory setting may
cause personal injury and/or property
damage, and will void the
manufacturer's warranty.
Pump sucking air
Check water supply connections.
Worn piston packing
Check and replace if necessary.
Insuffi cient water
Check fi lter 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 valves blocked
Check and clean if necessary.
Unloader valve seat worn
Check and replace if necessary.
Worn piston package
Check and replace if necessary.
PUMP NOISY
Air in suction line
Check water supply and connections on
suction 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 140°F.
PRESENCE OF WATER
IN PUMP OIL
Oil seal worn
Check and replace if necessary.
High humidity in air
Check and change oil twice as often.
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
regulator.
Spray gun is in the off position for
over 1-2 minutes
Turn machine off if not in use for over 1-2
minutes.
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