This is the Atlas Copco seal – 40/48×8 part number 3371813707, Crowder SKU AC-3371813707. It seals a pressure joint inside the post driver, and because elastomer takes a set long before the metal around it wears, it is one of the first items to replace when a machine starts weeping air or oil.
The published breakdown lists it on the LP110HD Hydraulic Post Driver and PPU22 Hydraulic Post Puller. Pull up the diagram and confirm the reference number for your serial before ordering.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the parts breakdown index. Ships from our Denver warehouse; in-stock parts ordered by 4 PM ET go out the same day.
- Part number: 3371813707
- Manufacturer: Atlas Copco
- Crowder SKU: AC-3371813707
- Listed on breakdowns for: LP110HD Hydraulic Post Driver, PPU22 Hydraulic Post Puller

