This is the Atlas Copco spring part number 3121049100, Crowder SKU AC-3121049100. Springs in a pusher leg fatigue with cycle count rather than age, so a control that has gone lazy or fails to return is usually this part rather than the component it drives.
Crowder’s breakdowns list this part on the BBC 34W WS Pusher Leg Drill and BBC 34DSI Rock Drill, and on 1 other machine. Check it against the reference number on the diagram first; serial breaks change what fits.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the parts diagram hub. Ships from our Denver warehouse; in-stock parts ordered by 4 PM ET go out the same day.
- Part number: 3121049100
- Manufacturer: Atlas Copco
- Crowder SKU: AC-3121049100
- Listed on breakdowns for: BBC 34W WS Pusher Leg Drill, BBC 34DSI Rock Drill, BBC 16W WS Pusher Leg Drill
