ARO 637140-89 Hytrel 1/2" Diaphragm Pump Repair Kit
1/2" AODP repair kit with Hytrel diaphragms and polyurethane balls for ARO 66605J-389 and 666053-389.
Hytrel diaphragm and polyurethane ball repair kit sized for 1/2" AODP fluid ends, listed for ARO 66605J-389 and 666053-389 pumps.
Part number 637140-89 is a 1/2" AODP fluid section repair kit that uses Hytrel for the diaphragms and polyurethane for the balls. It is listed for the ARO 66605J-389 and 666053-389 pumps, which share the -389 suffix.
Per the product notes, you receive a diaphragm, a ball and an O-ring, plus grease packaging. Hytrel is a thermoplastic polyester elastomer. The two materials do different jobs: the Hytrel diaphragm flexes to move fluid, and the polyurethane balls close against their seats to stop it flowing back. Swapping both in one session means the pump restarts with matched wetted parts.
Indicators for a Rebuild
- Fluid leaks out of the exhaust muffler.
- Check balls chatter or fail to seal, cutting delivery.
- Stroke rate climbs with no matching increase in output.
Pumps That Use 637140-89
Before ordering, read the model code on your pump nameplate and check it against this pair.
| Brand | ARO |
|---|---|
| Product Type | Kit |
| Material - Diaphragm | Hytrel |
| Material - Balls | Polyurethane |
| Notes | Repair Kit (1/2" AODP Fluid Section), Includes: O-Ring; Diaphragm; Ball; Grease Packaging |
