13
Troubleshooting
PROBLEM
POSSIBLE CAUSES
CORRECTIVE ACTION
Low Pressure
Inlet suction clogged or improper size .
Clean . Use adequate size .
Check more frequently .
Inadequate water supply .
Check flow available to pump .
Worn nozzle .
Replace nozzle of proper size .
Leaky discharge hose .
Repair or replace .
Pressure gauge inoperative or not
registering accurately .
Check with new gauge .
Replace worn or damaged gauge .
Air leak in inlet plumbing .
Disassemble, reseal, and reassemble .
Worn packing seals .
Replace packing seals .
Broken valve spring .
Replace spring .
Fouled or dirty inlet or discharge valves .
Clean inlet and discharge valves .
Worn or plugged relief valve on pump .
Clean, reset, and replace .
Cavitation .
Check suction lines on inlet of pump for
restrictions .
Rough/pulsating operation with
pressure drop.
Worn packing .
Replace packing .
Inlet restriction .
Check system for stoppage, air leaks, and
correctly sized inlet plumbing .
Cavitation .
Check inlet lines for restrictions and/or
proper size .
Water in crankcase.
High humidity .
Reduce oil change interval .
Leakage of crankcase or seals installed
backwards .
Replace packing .
Worn seals .
Replace seals .
Noisy operation.
Worn bearings .
Replace bearings . Refill crankcase with
recommended lubricant .
Cavitation .
Check inlet lines for restrictions and/or
proper size .
Frequent or premature failure of the
packing.
Damaged or worn plungers .
Replace plungers .
Abrasive material in the fluid being
pumped .
Install proper filtration on pump inlet
plumbing .
Excessive pressure and/or temperature of
fluid being pumped .
Check pressures and fluid inlet
temperature . Be sure they are within
specified range .
Over pressure of pumps .
Reduce pressure .
Running pump dry .
Do not run pump with inadequate water
supply .
Excessive leakage.
Worn or cracked plungers .
Replace plungers .
Inlet pressure too high .
Reduce inlet pressure .
High crankcase temperature.
Wrong grade of oil .
Use Giant oil or 20W-50 synthetic oil .
Improper amount of oil in crankcase .
Adjust oil level to proper amount .
