This is the Chicago Pneumatic cylinder part number R085886, cross-referenced to 3310104112, Crowder SKU CP-R085886. It carries the piston and the port timing for the rock drill. Bore wear is gradual, so it is usually diagnosed by falling performance rather than a breakdown.
The published breakdown lists it on the CP 9A 9F Rock Drill and CP 9BS Rock Drill, and on 2 other machines. Worth matching the reference number on the diagram against your own machine before you order the same part number can sit in more than one position.
Use the parts diagram hub to work through the rest of the assembly, or the CP tool catalog if you are pricing a replacement machine. Stocked in Denver orders placed by 4 PM ET ship the same day when the part is on the shelf.
- Part number: R085886
- Also listed as: 3310104112
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-R085886
- Listed on breakdowns for: CP 9A 9F Rock Drill, CP 9BS Rock Drill, CP 0009 A F E CS ES AC Rock Drill, CP 9RR 9RRS Rock Drill
