HIGH PRESSURE PUMP SYSTEM
TROUBLESHOOTING GUIDE
MALFUNCTION CAUSE REMEDY
The pressure Broken valve spring Replace spring
drops
Fouled inlet strainer Clean strainer
Fouled pre-filter(s) Replace filter cartridge(s)
Cavitation (Noisy operation) Check suction lines for
restrictions
Air in system Check suction lines for leaks
Water in crankcase High humidity Reduce oil change interval
Worn seals Replace seals
Noisy operating Worn bearings Replace bearings, refill crankcase
with recommended lubricant
Cavitation Check inlet lines for restrictions
Check strainer and filter(s)
Inability to Discharge valve chamber Allow more time to prime
build up pressure has air trapped within it and ensure that there are no
air suction leaks.
Open valve chambers and allow
air to escape
Rough/Pulsating
operation with Check system for stoppage or
air suction leaks
pressure drop Cavitation Check inlet lines for restrictions
Excessive Worn plunger(s) Replace plunger(s)
leakage between Worn seals Replace seals
the high pressure
pump manifold Cracked plunger(s) Replace plunger(s)
and rear crankcase
section
High crankcase Wrong grade of oil Use specified type of oil.
temperature Improper amount of oil in crankcase Adjust oil level to proper
amount
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