10
Pump System Malfunction
MALFUNCTION
CAUSE
REMEDY
The Pressure and/or
the Delivery Drops
Worn packing seals
Replace packing seals
Broken valve springs
Replace springs
Belt slippage
Tighten or Replace belt
Worn or Damaged nozzle
Replace nozzle
Fouled discharge valve
Clean valve assembly
Worn or Plugged relief valve on pump
Clean, Reset, and Replace
worn parts
Cavitations
Check suction lines on inlet
of pump for restrictions
Unloader
Check for proper operation
Water in Crankcase
High Humidity
Reduce oil change intervals
Worn Seals
Replace seals
Noisy Operating
Worn bearings
Replace bearings, Refill
crankcase oil with recommended
lubricant
Cavitation
Check inlet lines for restrictions
and/or proper sizing
Rough/Pulsating
Operation with
Pressure Drop
Worn packing
Replace packing
Inlet restriction
Check system for stoppage
air leaks, correctly sized
inlet plumbing to pump
Accumulator pressure
Recharge/Replace accumulator
Unloader
Check for proper operation
Cavitation
Check inlet lines for restrictions
and/or proper size
Pump Pressure as
Drop at gun Rated,
Pressure
Restricted discharge plumbing
Re-size discharge plumbing to flow
rate of pump
Excessive
Leakage
Worn plungers
Replace plungers
Worn packing/seals
Adjust or Replace packing seals
Excessive vacuum
Reduce suction vacuum
Cracked plungers
Replace plungers
Inlet pressure too high
Reduce inlet pressure
High Crankcase
Temperature
Wrong Grade of Oil
Giant oil is recommended
Improper amount of oil in crankcase
Adjust oil level to proper amount
