This is the Atlas Copco O-Ring 40X2 part number 0663210101, cross-referenced to 4090050700, Crowder SKU AC-0663210101. It keeps air or oil where it belongs inside the breaker. Once it flattens or hardens, the machine loses pressure across the joint and performance falls off gradually rather than all at once.
You will find it on the diagram for the RTEX 15US Paving Breaker and RTEX 35US Paving Breaker.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the parts diagram hub. Stocked in Denver orders placed by 4 PM ET ship the same day when the part is on the shelf.
- Part number: 0663210101
- Also listed as: 4090050700
- Manufacturer: Atlas Copco
- Crowder SKU: AC-0663210101
- Listed on breakdowns for: RTEX 15US Paving Breaker, RTEX 35US Paving Breaker

