H/G-25 Troubleshooting
Contents
1. drive belt s e Worn spray nozzle s e Cracked cylinder casting Pump Runs Rough Worn pump valves e Airlock in outlet system e Oil level low Wrong weight of oil for cold operating temperatures change to lighter weight e Cavitation e Air in suction line e Restriction in inlet suction line e Hydraulic cells not primed after changing diaphragm e Foreign material in inlet or outlet valve Damaged diaphragm e Fatigued or broken valve spring e Brocken piston return spring insed hydraulic end Premature Failure of Diaphragm Frozen pump e Puncture by a foreign object Elastomer incompatible with fluid being pumped Pump running too fast e Excess pressure e Cavitation e Broken piston return spring 50 Water or Process Fluid in Oil Reservoir Condensation e Ruptured diaphragm e Hydraulic cell not properly primed after diaphragm replacement Frozen pump e Diapragm screw O ring 18 missing or cracked e Cracked cylinder casting Strong Water or Process Fluid Pulsations NOTE Small pulsations are normal in single acting pumps with multiple pumping chambers Foreign object lodged in pump valve e Loss of prime in hydraulic cell because of low oil level Air in suction line e Valve spring 13 broken e Cavitation e Aeration or turbulence in supply tank G25 991 2400 5 1 04 H G 25 Troubleshooting Valve Wear Normal wear from high speed operation Cavitation Abrasives in2. H G 25 Troubleshooting Cavitation e Inadequate fluid supply because Inlet line collapsed or clogged Clogged line strainer Inlet line too small or too long Air leak in inlet line Worn or damaged inlet hose Suction line too long Too many valves and elbows in inlet line e Fluid too hot for inlet suction piping system e Air entrained in fluid piping system e Aeration and turbulence in supply tank e Inlet vacuum too high Symptoms of Cavitation e Excessive pump valve noise e Premature failure of spring or retainer e Volume or pressure drop e Rough running pump e Premature failure of diaphragms e Piston return spring failure insed hydraulic end Drop in Volume or Pressure A drop in volume or pressure can be caused by one or more of the following e Air leak in suction piping e Clogged suction line or suction strainer e Suction line inlet above fluid level in tank e Inadequate fluid supply Pump not operating at proper RPM e Relief valve bypassing fluid e Worn pump valve parts e Foreign material in inlet or outlet valves e Loss of oil prime in cells because of low oil level e Ruptured diaphragm e Cavitation e Warped manifold from overpressurized system e O rings forced out of their grooves from overpressurization e Air leak in suction line strainer or gasket e Cracked suction hose e Empty supply tank e Excessive aeration and turbulence in supply tank e Worn and slipping
3. 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 19 G25 991 2400 5 1 04
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