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
