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- Check air inlet screen and air filter for debris.
- Check for sticking air valve, flush air valve in solvent.
- 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.
- 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.
- Check for rotating piston in air valve. This indicates a failed guide pin.
- 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.).
- Check for pump cavitation; slow pump speed down to match thickness of material being pumped.
- 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
- Check to make sure all suction connections are air tight, especially clamp bands around intake air.
- Check for excessive moisture in compressed air. Either install dryer or hot air generator for compressed air.
- Check for ruptured diaphragm.
- Check tightness of clamp bands, especially at intake manifold.
- Check for diaphragm rupture.
- Check tightness of piston plates to shaft.
- Create false discharge head or suction lift.
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