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MALFUNCTION CAUSE REMEDY
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
Cavitation
Check inlet lines of pump for restrictions
or leakage
Unloader Check for proper operation
High Humidity Reduce oil change intervals
Worn Seals Replace seals
Worn bearings
Replace bearings, Refill crankcase with
recommended oil
Cavitation
Check inlet lines for restrictions and/or
proper sizing
Worn packing Replace packing
Inlet restriction
Check system for stoppage, air leaks,
correctly sized inlet plumbing to pump
Accumulator pressure Recharge or replace accumulator
Unloader Check for proper operation
Cavitation
Check inlet lines for restrictions and/or
proper sizing
Pressure drop at gun Restricted discharge plumbing
Re-size discharge plumbing to flow rate of
pump
Worn plungers Replace plungers
Worn packing/seals Adjust or replace packing seals
Excessive vacuum Reduce inlet vacuum
Cracked plungers Replace plungers
Inlet pressure too high Reduce inlet pressure
Wrong Grade of Oil Giant oil is recommended
Improper amount of oil in crankcase Adjust oil level to proper amount
PUMP SYSTEM TROUBLESHOOTING CHART
High Crankcase
Temperature
Excessive leaka
g
e
Rou
g
h/Pulsatin
g
Operation with
Pressure Drop
Noisy Operating
Water in Crankcase
The Pressure and/
or the delivery Drops
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