Dover PSG BLACKMER MLN4B, Инструкции по установке, эксплуатации и обслуживанию, Страница: 18 / 20

106-A00 Page 18/20
TROUBLESHOOTING
….continued
DAMAGED VANES
Probable Cause

Foreign objects entering the pump.

Running the pump dry for extended periods of time.

Cavitation.

Viscosity too high for the vanes and /or the pump
speed.

Incompatibility with the liquids pumped.

Excessive heat.

Worn or bent push rods, or worn push rod holes.

Settled or solidified material in the pump at start-up.

Hydraulic hammer - pressure spikes.

Vanes installed incorrectly (see"Vane Replacement").
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.

Ball bearings overgreased.

Pump sleeve bearings worn excessively.

Excessive cavitation.

Mechanical seal faces cracked, scratched, pitted or dirty.
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.

Excessive viscosity, pressure or speed.

Bearing locknuts adjusted improperly.

Faulty or worn bearings.

Rotor rubbing against head or cylinder.

Dirty mechanical seal faces.