Description
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: 55486
Brand: Hydro-Gear (OEM-Spec)
Part Type: Lip Seal (Hydraulic Oil Seal)
Dimensions: 17 mm ID × 40 mm OD × 7 mm Width
Seal Material: HNBR (Hydrogenated Nitrile Butadiene Rubber)
Function: Seals rotating shaft interfaces to prevent fluid leakage
Application: Hydro-Gear hydrostatic transmissions & pump/motor units
Construction: Durable elastomer sealing lip with reinforced body
OEM Status: Genuine Hydro-Gear replacement part
Function
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Prevents hydraulic fluid from escaping around rotating shafts
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Protects internal hydrostatic system components from contamination
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Maintains proper fluid pressure for smooth hydrostatic drive operation
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Delivers long service life under heat, pressure, and vibration
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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:
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Hydro-Gear integrated transaxles requiring a 17 mm × 40 mm × 7 mm seal
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Pump or motor assemblies specified in OEM parts diagrams for part number 55486
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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:
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Prepare: Drain the hydraulic fluid and clean the surrounding area thoroughly.
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Access Seal Position: Disassemble transmission or pump housing to reach the seal location.
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Remove Old Seal: Carefully extract the worn seal without damaging the bore.
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Inspect Surfaces: Check shaft and bore surfaces for scoring or wear.
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Install Seal: Press the new Hydro-Gear 55486 lip seal squarely into the bore with a proper seal driver.
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Reassemble: Reassemble components, refill hydraulic fluid, and test operation for leaks.
Proper installation ensures effective sealing and reliable system performance.
Suggested Maintenance
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Inspect around seal areas periodically for fluid seepage
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Keep hydraulic fluid clean and at proper levels to reduce seal wear
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Replace seals whenever related components are disassembled
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Avoid sharp tools that could damage HNBR sealing lips during service
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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.
