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PUMP TROUBLESHOOTING
BROKEN SHAFT
Probable Cause
Foreign objects entering the pump.
Viscosity too high for the pump speed.
Relief valve not opening.
Hydraulic hammer - pressure spikes.
Pump/driver,
driveline/drive shaft misalignment.
Excessively worn vanes or vane slots.
Settled or solidified material in the pump at start-up.
Overtightened V-belts, if used.
SEAL LEAKAGE
Probable Cause
O-rings not compatible with the liquids pumped.
O-rings nicked, cut or twisted.
Shaft at seal area damaged, worn or dirty.
Excessive
cavitation.
Mechanical seal faces cracked, scratched, pitted or dirty.
Ball bearings overgreased.
MOTOR OVERLOAD
Probable Cause
Horsepower of motor not sufficient for application
Improper wire size / wiring and/or voltage to motor.
Misalignment in pump drive system.
Bearing locknuts adjusted improperly.
Excessive
viscosity,
pressure or speed.
Faulty or worn bearings.
Rotor rubbing against head or liner.
Dirty mechanical seal faces.
1809 Century Avenue, Grand Rapids, Michigan 49503-1530 U.S.A.
Telephone: (616) 241-1611 • Fax: (616) 241-3752
E-mail: blackmer @blackmer.com • Internet Address: www .blackmer.com