ARO 93075 Polyurethane O-Ring for Diaphragm Pump Pilot Valves

ARO 93075 O-Ring for Pilot-Valve Maintenance

The ARO 93075 Polyurethane O-Ring is a replacement seal for the pilot-valve assembly in compatible ARO air-operated diaphragm pumps. Its nominal dimensions are 1/8-inch cross-section and 3/4-inch outside diameter. Choose this component when your equipment’s parts diagram identifies 93075 as the required replacement.

Identify the Correct Air-Motor Seal

In ARO’s 66610X-X-C 1-inch metallic pump manual, this O-ring appears as item 119, with four required in the documented pilot-valve assembly. Its location is within the air-motor section, alongside the pilot rod and spacers—not at the fluid inlet or outlet manifold.

For a targeted repair, match the part number to the installation position before ordering. Keep the assembly quantity separate from the supplier’s package quantity, and specify how many replacement O-rings your maintenance job requires.

A Relevant Check for Irregular Pump Cycling

ARO’s 66605X-X troubleshooting guidance identifies worn item 119 O-rings as a possible cause to investigate when a pump cycles excessively fast or runs erratically. The same seals are among the components to inspect when the pump exhausts air while stalled. Replacement should follow inspection rather than assuming one O-ring will resolve every operating problem.

Plan an Individual Repair or Air-Section Overhaul

For broader servicing of the 1-inch PRO Series metallic pump family, ARO specifies the 637118-C Air Section Service Kit. PRO Series air-section kits bring together O-rings, gaskets and U-cups for standard maintenance. Compare the required components with the appropriate kit before deciding between a targeted replacement and a more comprehensive repair.

Prepare for Installation and Future Maintenance

Follow the pump-specific service procedure, protect O-rings from cuts during assembly and use Lubriplate FML-2 where specified. Inspect mating components rather than replacing the seal without checking the surrounding assembly.

Order using ARO 93075, the full pump model and your required quantity. For recurring maintenance, record the part number against the equipment asset and distinguish immediate repair needs from additional spare-stock requirements.