CAT Pumps 47215 Buna-N Oil Seal (1 per Cylinder) - 5973
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The Cat Pumps 47215 is a genuine OEM replacement crankcase oil seal for Cat plunger pumps. Each seal fits around one plunger rod where it exits the crankcase, keeping lubricating oil inside the pump and blocking water and contaminants from getting in. It’s made from Buna-N (nitrile) rubber with a 70 durometer hardness, which holds up well against pump oil and water. A worn or damaged oil seal typically shows up as oil leaking from under the pump, a dropping oil level, or milky, water-contaminated oil. Left unchecked, that can damage bearings, connecting rods, and the crankshaft. Because water seals and oil seals wear together, it’s good practice to replace the oil seals whenever you rebuild the pump’s water seals or replace plungers.
This seal is sold individually, one per cylinder, so a typical triplex pump needs three for a complete replacement.
Key features:
- Crankcase oil seal for Cat plunger pumps
- Buna-N (NBR), 70 durometer
- Keeps oil in and water and debris out of the crankcase
- Sold individually: one per cylinder (three for most triplex pumps)
- Genuine OEM Cat Pumps part