Section 6 Maintenance HP7A Manual
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6-4
Air Filter / Regulator
To maintain maximum ltering and efciency, and to avoid excessive pressure drop, the lter regulator
must be kept clean. Erratic regulator operation or loss of regulation is most always due to dirt in the disc
area. If the air supply is kept clean the regulator should provide long periods of uninterrupted service.
As needed, depressurize and disassemble the lter / regulator (remove the bowl, lter and disc
assembly). Clean parts with denatured alcohol and blow out body with compressed air. When
reassembling, make sure disc stem ts into its center hole of diaphragm assembly. If diaphragm
assembly is replaced, make sure disc stem ts into its center. Tighten bonnet slightly more than nger
tight (50 inch pounds).
Wash porous lter elements with denatured alcohol.
Clean plastic bowl only with household soap.
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