701-D00 page 15/16
TROUBLESHOOTING
NOTICE:
Maintenance shall be performed by qualified technicians only,
following the appropriate procedures and warnings as presented in this manual.
SYMPTOM PROBABLE
CAUSE
Damaged Vanes
1. Foreign objects entering the pump.
2. Running the pump dry for extended periods of time.
3. Cavitation.
4. Incompatibility with the liquids pumped.
5. Excessive
heat.
6. Worn or bent push rods, or worn push rod holes.
7. Hydraulic hammer - pressure spikes.
8. Vanes installed incorrectly (see"Vane Replacement").
Broken Shaft
1. Foreign objects entering the pump.
2. Relief valve not opening.
3. Hydraulic hammer - pressure spikes.
4. Pump/driver, driveline/drive shaft misalignment.
5. Excessively worn vanes or vane slots.
SEAL LEAKAGE
1. O-rings not compatible with the liquids pumped.
2. O-rings nicked, cut or twisted.
3. Shaft at seal area damaged, worn or dirty.
4. Ball bearings overgreased.
5. Excessive
cavitation.
6. Mechanical seal faces cracked, scratched, pitted or dirty.
MOTOR OVERLOAD
1.
Horsepower of motor not sufficient for application
2.
Improper wire size / wiring and/or voltage to motor.
3.
Misalignment in pump drive system.
4.
Excessive viscosity, pressure or speed.
5.
Bearing locknuts adjusted improperly.
6.
Faulty or worn bearings.
7.
Rotor rubbing against head or cylinder.
8.
Dirty mechanical seal faces.
