Back Head Ass’y is the American Pneumatic Tool service part carried under part number 1280583375, which replaced the older number 18034. It caps the cylinder and houses the throttle path on a breaker. Thread damage at the inlet is the most common reason one gets replaced.
It shows up in the parts breakdown for the 140A Airgo Paving Breaker. It comes off the APT 140 Pneumatic Paving Breaker. Compare it to the reference callout on the diagram to be sure it is the position you need.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the full diagram library. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 1280583375
- Previous part number: 18034
- Manufacturer: American Pneumatic Tool
- Crowder SKU: APT18034
- Listed on breakdowns for: 140A Airgo Paving Breaker
