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Trouble Possible Cause Remedy
Consistent knock. Water in power end, crankcase. Drain. Refill with clean oil.
Worn or noisy gear. Replace.
Worn or loose main bearing, crank pin
bearing, wrist pin bushing, plunger,
valve seat, low oil level.
NOTE: High speed power pumps are
not quiet. Checking is necessary only
when the sound is erratic.
Adjust or replace.
Add oil to proper level.
Packing failure (excessive). Improper installation. Install per instructions.
Improper or inadequate lubrication. Lubricate per instructions.
Improper packing selection. Change to correct packing.
Scored plungers. Replace.
Worn or oversized stuffing box
bushings.
Repair or replace. Check bore
and outside diameter of bushings
frequently. (Many times plungers are
replaced and bushings ignored.)
Plunger misalignment. Realign. Plungers must operate
concentrically in stuffing box.
Wear of liquid end parts. Abrasive or corrosive action of liquid. Check valves and seats frequently
at start-up to determine schedule
for replacing, etc. Eliminate sand,
abrasive, air entering pump.
Incorrect material. Install correct materials.
Liquid end cylinder failure. Air entering suction system. Eliminate air.
NOTE: Pitting often leads to hairline
cracks which ends in cylinder failure.
Wear of power end parts (excessive). Poor lubrication. Replace oil as recommended in
instructions. Keep oil clean
and at correct temperature.
Be sure oil is reaching all bearings.
Overloading. Modify pump or system
to eliminate overload.
Liquid in power end. Drain power end. Eliminate
cause or source of liquid entering
power end. Relubricate.
TROUBLE LOCATION AND REMEDY
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