This is Atlas Copco part number 0663211800 O-Ring, stocked at Crowder Supply as AC-0663211800. 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.
Crowder’s breakdowns list this part on the ALF 72D 72D-1 Pusher Leg and ALF 67/80 67/80D Pusher Leg. It comes off the Atlas Copco Pusher Leg Attachment For BBC Series Rock Drills. Check it against the reference number on the diagram first; serial breaks change what fits.
Everything else on that machine is one page away, and the parts diagram hub indexes every breakdown we publish. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 0663211800
- Manufacturer: Atlas Copco
- Crowder SKU: AC-0663211800
- Listed on breakdowns for: ALF 72D 72D-1 Pusher Leg, ALF 67/80 67/80D Pusher Leg
