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HP D-04, G-04 Valve Wear, Loss of Oil, Premature Failure of Valve Spring or Retainer

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D/G-04 Troubleshooting

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

•Worn shaft seal

•Oil drain piping or fill cap loose.

•Valve plate and manifold bolts loose

•Pump housing porosity

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.

18	D04-991-2400 5/1/04

Contents

WANNER ENGINEERING, INC Calculating Required Horsepower (kW) Performance Net Positive Suction Head – NPSHr Dry Lift D/G-04Models with Metallic Pumping Head Location Mounting Important Precautions Inlet Piping (Suction Feed) Inlet Piping (Pressure Feed) Inlet Calculations Discharge Piping Before Initial Start-Up Initial Start-UpProcedure Daily Periodically Shutdown Procedure During Freezing Temperatures Page Tools and Supplies 1.Remove Manifold (3) and Valve Plate (12) 2. Inspect Valves (5-11) 3.Inspect and Replace Diaphragms (17) 4.Flush Contaminant from Hydraulic End 5.Prime the Hydraulic Cells 6.Reinstall Valve Plate (12) and Manifold (3) Page 1. Disassemble Pistons 2.Reassemble Pistons 1.Remove Pump Housing 2.Remove and Replace Pistons 3. Replace Shaft Seal 4.Reassemble Housing and Back Cover 5.Reinstall Diaphragms 6.Reassemble Pump Cavitation Pump Runs Rough Drop in Volume or Pressure Premature Failure of Diaphragm Water (or Process Fluid) in Oil Reservoir Valve Wear Loss of Oil Premature Failure of Valve Spring or Retainer