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9
PUMP TROUBLE SHOOTING
MALFUNCTION
The Pressure and/or
the Delivery Drops
Water in crankcase
Noisy Operation
Rough/Pulsating
Operation with
Pressure Drop
Pressure Drop at
Gun
Excessive Leakage
High Crankcase
Temperature
CAUSE
Worn packing seals
Broken valve spring
Worn or Damaged nozzle
Fouled discharge valve
Fouled inlet strainer
Worn or Damaged hose
Worn or Plugged relief valve on pump
Cavitation
High humidity
Worn seals
Worn bearings
Cavitation
Worn packing
Inlet restriction
Cavitation
Restricted discharge plumbing
Worn plungers
Worn packing/seals
Excessive vacuum
Inlet pressure too high
Wrong Grade of oil
Improper amount of oil in crankcase
REMEDY
Replace packing seals
Replace spring
Replace nozzle
Clean valve assembly
Clean strainer
Repair/Replace hose
Clean, Reset, and Replace worn parts
Check suction lines on inlet of
pump for restrictions
Reduce oil change interval
Replace seals
Replace bearings, Refill crankcase
oil with recommended lubricant
Check inlet lines for restrictions
and/or proper sizing
Replace packing
Check system for stoppage, air
leaks, correctly sized inlet plumb-
ing to pump
Check inlet lines for restrictions
and/or proper size
Re-size discharge plumbing to
flow rate of pump
Replace plungers
Adjust or Replace packing seals
Reduce suction vacuum
Reduce inlet pressure
Giant oil is recommended
Adjust oil level to proper amount