Main Valve, Atlas Copco part number 3121075800, listed at Crowder Supply as AC-3121075800. This part controls the working cycle of the rock drill. When its faces wear, the tool sounds different and the blow rate falls off usually the first thing checked on a slow machine.
It shows up in the parts breakdown for the BBC 34DSI Rock Drill and BBC 34W WS Pusher Leg Drill. Compare it to the reference callout on the diagram to be sure it is the position you need.
The parts diagram library indexes every breakdown we publish, and the Atlas Copco lineup has the tools these parts go into. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: 3121075800
- Manufacturer: Atlas Copco
- Crowder SKU: AC-3121075800
- Listed on breakdowns for: BBC 34DSI Rock Drill, BBC 34W WS Pusher Leg Drill
