
Doc. No.: OMS500000104
Rev: A Page 38 of 42
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Crankshaft jerks or starts and stops rotation
−
V-belts are loose and slipping (if equipped)
−
Hydraulic system relief valve is chattering (if equipped):
1.
Attempting to operate pump at excessively high discharge
pressure
2.
Discharge line is blocked or partially obstructed
Power end overheats (in excess of 180
°
F)
−
Discharge pressure too high
−
Low oil level
−
Improper oil viscosity
−
Contaminated power end oil
−
Pump speed is too fast
−
Pump is running backwards
−
Couplings are misaligned
−
V-belt drive tension is too tight
−
Pump located too close to heat source
−
Worn or damaged power frame bearings
Broken crankshaft or connecting rod
−
Pump exposed to freezing conditions without proper draining
−
Discharge pressure too high
−
Suction pressure too high
−
Hydraulic shock due to cavitation
−
Material or manufacturing defect
Broken Fluid End Bolts
−
Bolt or nut not properly torqued
−
Discharge pressure too high
−
Excessive piping loads on fluid end
Power end oil is contaminated
−
Pump has been operated with failed piston cup for extended periods of time
−
Use of high-pressure wash wand to clean near breather or oil seal areas
−
Deflector shields are missing or damaged
−
Crosshead extension oil seals are damaged or improperly installed
−
Excessive capacity in liner wash system
−
Improperly adjusted liner wash nozzle