This is Atlas Copco part number 3121049000 ratchet pin, stocked at Crowder Supply as AC-3121049000. It is part of the rotation mechanism of the pusher leg the drive train that indexes the steel between blows. Wear here shows as slow or intermittent rotation.
It shows up in the parts breakdown for the BBC 34W WS Pusher Leg Drill and BBC 34DSI Rock Drill, and on 1 other machine. Pull up the diagram and confirm the reference number for your serial before ordering.
Use the parts diagram library to work through the rest of the assembly, or the Atlas Copco lineup if you are pricing a replacement machine. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 3121049000
- Manufacturer: Atlas Copco
- Crowder SKU: AC-3121049000
- Listed on breakdowns for: BBC 34W WS Pusher Leg Drill, BBC 34DSI Rock Drill, BBC 16W WS Pusher Leg Drill

