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
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