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MALFUNCTION
The Pressure and/
or the Delivery Drops
Water in Crankcase
Noisy Operating
Rough/Pulsating
Operation with
Pressure Drop
Pump Pressure as
Drop at gun Rated,
Pressure
Excessive
Leakage
High Crankcase
Temperature
PUMP SYSTEM MALFUNCTIONS
CAUSE
Worn packing seals
Broken valve springs
Belt slippage
Worn or Damaged nozzle
Fouled discharge valve
Worn or Plugged relief valve on pump
Cavitations
Unloader
High Humidity
Worn Seals
Worn bearings
Cavitation
Worn packing
Inlet restriction
Accumulator pressure
Unloader
Cavitation
Restricted discharge plumbing
Worn plungers
Worn packing/seals
Excessive vacuum
Cracked plungers
Inlet pressure too high
Wrong Grade of Oil
Improper amount of oil in crankcase
REMEDY
Replace packing seals
Replace springs
Tighten or Replace belt
Replace nozzle
Clean valve assembly
Clean, Reset, and Replace
worn parts
Check suction lines on inlet
of pump for restrictions
Check for proper operation
Reduce oil change intervals
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 plumbing to pump
Recharge/Replace accumulator
Check for proper operation
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
Replace plungers
Reduce inlet pressure
Giant oil is recommended
Adjust oil level to proper amount
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