Pump will not or runs slowly.
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Check air inlet screen and air filter for debris.
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Check for sticking air valve, flush air valve in solvent.
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Check for worn out air valve. If piston face in air valve is shiny instead of dull, air valve is probably worn beyond working tolerances and must be replaced.
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Check center block Glyd™ rings. If worn excessively, they will not seal and air will simply flow through pump and out air exhaust. Use only Wilden Glyd™ rings as they are of special construction.
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Check for rotating piston in air valve. This indicates a failed guide pin.
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Check type of lubricant being used. A higher viscosity oil than suggested may cause the piston to stick or run erratically. Wilden suggests the use of an oil with arctic characteristics (ISO 15-5 wt.).
Pump runs but little or no product flows.
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Check for pump cavitation; slow pump speed down to match thickness of material being pumped.
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Check for sticking ball check valves. If material being pumped is not compatible with pump elastomers, swelling may occur. Replace ball check valves and O-rings with the proper elastomers
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Check to make sure all suction connections are air tight, especially clamp bands around intake air.
Pump air valve freezes.
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Check for excessive moisture in compressed air. Either install dryer or hot air generator for compressed air.
Air bubbles in pump discharge.
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Check for ruptured diaphragm.
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Check tightness of clamp bands, especially at intake manifold.
Product comes air exhaust.
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Check for diaphragm rupture.
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Check tightness of piston plates to shaft.
Pump rattles.
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Create false discharge head or suction lift.
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