Valve Case Ass’y, Chicago Pneumatic part number R122977, which also shows up as 3310103363, listed at Crowder Supply as CP-R122977. This part controls the working cycle of the breaker. 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 CP 1240 1240S 1240SVR Paving Breaker and CP 1290SPDR Spike Driver. Compare it to the reference callout on the diagram to be sure it is the position you need.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the parts diagram library. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: R122977
- Also listed as: 3310103363
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-R122977
- Listed on breakdowns for: CP 1240 1240S 1240SVR Paving Breaker, CP 1290SPDR Spike Driver
