55486 – Hydro-Gear Lip Seal 17 mm x 40 mm x 7 mm (HNBR) (OEM-Spec) The Hydro-Gear 55486 Lip Seal is a genuine OEM-spec hydraulic sealing component engineered to prevent fluid leakage and protect internal moving parts within Hydro-Gear hydrostatic transmissions, pump assemblies, and drive units. Manufactured from high-quality HNBR (Hydrogenated Nitrile Butadiene Rubber), this lip seal offers excellent resistance to heat, oil, and wear—making it ideal for heavy-duty turf equipment and continuous hydraulic service. With precise dimensions of 17 mm inner diameter × 40 mm outer diameter × 7 mm thickness, the 55486 seal is designed to meet Hydro-Gear’s strict performance and durability standards for dependable operation. Product Details Manufacturer Part Number: 55486Brand: Hydro-Gear (OEM-Spec)Part Type: Lip Seal (Hydraulic Oil Seal)Dimensions: 17 mm ID × 40 mm OD × 7 mm WidthSeal Material: HNBR (Hydrogenated Nitrile Butadiene Rubber)Function: Seals rotating shaft interfaces to prevent fluid leakageApplication: Hydro-Gear hydrostatic transmissions & pump/motor unitsConstruction: Durable elastomer sealing lip with reinforced bodyOEM Status: Genuine Hydro-Gear replacement part Function Prevents hydraulic fluid from escaping around rotating shafts Protects internal hydrostatic system components from contamination Maintains proper fluid pressure for smooth hydrostatic drive operation Delivers long service life under heat, pressure, and vibration HNBR material resists oil, heat, and wear better than standard elastomers Compatible With The Hydro-Gear 55486 Lip Seal is used in select Hydro-Gear hydrostatic drive systems, including: Hydro-Gear integrated transaxles requiring a 17 mm × 40 mm × 7 mm seal Pump or motor assemblies specified in OEM parts diagrams for part number 55486 Rebuild kits where precision sealing around rotating shafts is necessary Note: Always verify compatibility by referencing your Hydro-Gear transmission or pump model against the official parts breakdown before ordering. How It’s Used This lip seal installs in the hydraulic housing where a rotating shaft passes through a bore: Prepare: Drain the hydraulic fluid and clean the surrounding area thoroughly. Access Seal Position: Disassemble transmission or pump housing to reach the seal location. Remove Old Seal: Carefully extract the worn seal without damaging the bore. Inspect Surfaces: Check shaft and bore surfaces for scoring or wear. Install Seal: Press the new Hydro-Gear 55486 lip seal squarely into the bore with a proper seal driver. Reassemble: Reassemble components, refill hydraulic fluid, and test operation for leaks. Proper installation ensures effective sealing and reliable system performance. Suggested Maintenance Inspect around seal areas periodically for fluid seepage Keep hydraulic fluid clean and at proper levels to reduce seal wear Replace seals whenever related components are disassembled Avoid sharp tools that could damage HNBR sealing lips during service Use OEM-spec Hydro-Gear seals to ensure correct fit and long service life The Hydro-Gear 55486 Lip Seal (17 × 40 × 7 mm, HNBR) is a dependable OEM-spec replacement designed to provide leak-free sealing, protect internal components, and support long-lasting performance in compatible Hydro-Gear hydrostatic transmission and hydraulic systems.
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