Page 37 - Jet Pumping Station

Troubleshooting
Cavitation Pump Runs Rough

Fluid too hot for inlet suction piping system. Worn pump valves.
Air lock in outlet system.
Air entrained in fluid piping system. Oil level low.
Aeration and turbulence in supply tank. Wrong weight oil for cold operating temperatures
Inlet suction vacuum too high. (change to lighter weight).
SYMPTOMS OF CAVITATION Air in suction line
Restriction in inlet/suction line.
• Excessive pump valve noise
Cavitation.
• Premature failure of spring or retainer (14, 16) Hydraulic cells not primed after changing diaphragms.
• Premature failure of diaphragms (22) Foreign material in inlet or outlet valves.
Damaged diaphragm.
• Volume or pressure drop
Fatigued or broken valve spring (14).
• Rough-running pump Broken piston return spring (inside hydraulic end).
• Piston return spring failure (inside hydraulic end). Inadequate fluid supply because of:
Drop in Volume or Pressure Inlet line collapsed or clogged
Clogged line strainer
Air leak in suction piping. Inlet line too small or too long
Clogged suction line or suction strainer. Air leak in inlet line
Suction line inlet above fluid level in tank. Worn or damaged inlet hose
Inadequate fluid supply. Suction line too long
Pump not operating at proper RPM. Too many valves and elbows in inlet line.
Premature Failure of Diaphragm
Relief valve bypassing fluid.
Worn pump valve parts.
Frozen pump.
Foreign material in inlet or outlet valves.
Loss of prime in cells because of low oil level. Puncture by a foreign object.
Ruptured diaphragm.
Cavitation. Elastomer incompatible with fluid being pumped.
Warped manifold from overpressurized system. Cavitation.
O-rings forced out of their grooves from Pump running too fast.
overpressurization. Broken piston return spring (50)
Air leak in suction line strainer or gasket. Excess pressure.
Cracked suction hose. Water in Oil Reservoir
Empty supply tank. Condensation.
Excessive aeration and turbulence in supply tank. Ruptured diaphragm.
Worn and slipping drive belt(s).
Hydraulic cells not properly primed after diaphragm
Worn spray nozzle(s). replacement.
Cracked cylinder casting. Frozen pump.
Diaphragm screw O-ring (20) missing or cracked.
Cracked cylinder casting.

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