This is Atlas Copco part number 3377021263 gasket, stocked at Crowder Supply as AC-3377021263. Its job is to hold the pressure boundary between two mating faces; a hardened or nicked seal shows up as lost power and a damp housing well before anything else fails.
It appears on the LP 18-30PE & 18-40 PE Hydraulic Power Pac breakdown.
Everything else on that machine is one page away on the parts diagram library; complete tools are on the Atlas Copco lineup. Stocked in Denver orders placed by 4 PM ET ship the same day when the part is on the shelf.
- Part number: 3377021263
- Manufacturer: Atlas Copco
- Crowder SKU: AC-3377021263
- Listed on breakdowns for: LP 18-30PE & 18-40 PE Hydraulic Power Pac

