CAT Pumps 17547 Buna-N O-Ring 2.4x15.3mm 3CP/3PFR - 5751
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The Cat Pumps 17547 is a genuine OEM replacement O-ring for Cat 3CP, 3PFR, and 66D series plunger pumps. It measures 2.4mm x 15.3mm and is made from Buna-N (nitrile) rubber with an 85 durometer hardness. That’s noticeably firmer than standard 70 durometer O-rings, which helps it resist extrusion and hold its shape under the high pressures these pumps run at. Nitrile also stands up well to water, oils, and many common cleaning solutions.
O-rings harden, flatten, or crack over time from pressure cycling, heat, and chemical exposure, and they’re often damaged when parts are removed during service. Worn O-rings typically show up as drips, seepage, or pressure loss. Replacing them whenever you open the pump for valve or seal work restores a tight, leak-free seal and helps protect more expensive components.
Key features:
- 2.4mm x 15.3mm
- Buna-N (NBR), 85 durometer
- Fits Cat 3CP, 3PFR, and 66D series pumps
- Firm compound resists extrusion under high pressure
- Genuine OEM Cat Pumps part