19
D10-991-2400 5/1/04
Water (or Process Fluid)
Pulsations
NOTE: Small pulsations are normal in single-acting pumps
with multiple pumping chambers.
•
Foreign object lodged in pump valve
•
Loss of prime in hydraulic cell because of low oil level
•
Air in suction line
•
Valve spring (13) broken
•
Cavitation
•
Aeration or turbulence in supply tank
Valve Wear
•
Normal wear from high-speed operation
•
Cavitation
•
Abrasives in the fluid
•
Valve incompatible with corrosives in the fluid
•
Pump running too fast
Loss of Oil
•
External seepage
•
Rupture of diaphragm
•
Frozen pump
•
Diapragm screw O-ring (18) missing or cracked
•
Worn shaft seal
•
Oil drain piping or fill cap loose.
•
Valve plate and manifold bolts loose
Premature Failure of Valve
Spring or Retainer
•
Cavitation
•
Foreign object in the pump
•
Pump running too fast
•
Spring/retainer material incompatible with fluid being
pumped
•
Excessive inlet pressure.
D/G-10 Troubleshooting
