This is the American Pneumatic Tool rear valve chest part number 1280583796, previously 02500, Crowder SKU APT2500. This part controls the working cycle of the rock drill. When its faces wear, the tool sounds different and the blow rate falls off usually the first thing checked on a slow machine.
You will find it on the diagram for the 137 Rock Drill. The complete machine is the APT 137 Pneumatic Rock Drill.
Need the parts around it? They are on the same breakdown, and the parts diagram hub covers every machine we publish. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 1280583796
- Previous part number: 02500
- Manufacturer: American Pneumatic Tool
- Crowder SKU: APT2500
- Listed on breakdowns for: 137 Rock Drill

