Ordering by number: this is R278009, the Chicago Pneumatic retainer ring. This part keeps the steel captive in the rock drill under repeated impact, so it is inspected at every steel change and replaced on condition rather than on a schedule.
Crowder’s breakdowns list this part on the CP 9RR 9RRS Rock Drill. Pull up the diagram and confirm the reference number for your serial before ordering.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the parts diagram library. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: R278009
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-R278009
- Listed on breakdowns for: CP 9RR 9RRS Rock Drill
