Ordering by number: this is 1280583774, previously 02394, the American Pneumatic Tool piston stem bearing. It is the working heart of the rock drill. Pistons are matched to the cylinder bore, so replacing a worn one usually means checking the bore at the same time.
It is called out in the parts diagram for the 137 Rock Drill. It comes off the APT 137 Pneumatic Rock Drill. Pull up the diagram and confirm the reference number for your serial before ordering.
Everything else on that machine is one page away, and the full diagram library indexes every breakdown we publish. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 1280583774
- Previous part number: 02394
- Manufacturer: American Pneumatic Tool
- Crowder SKU: APT2394
- Listed on breakdowns for: 137 Rock Drill
