55526 – Hydro-Gear Lip Seal 22 mm × 32 mm × 7 mm TC (HNBR) (OEM-Spec)
The Hydro-Gear 55526 Lip Seal is a genuine OEM-spec hydraulic sealing component engineered to deliver dependable fluid retention and protection for internal components in Hydro-Gear hydrostatic transmissions, pump/motor assemblies, and related systems. Precisely sized at 22 mm inner diameter × 32 mm outer diameter × 7 mm thickness and featuring a TC (double-lip with garter spring) design, this seal provides enhanced sealing performance under pressure. Constructed from HNBR (Hydrogenated Nitrile Butadiene Rubber) for excellent resistance to heat, oil, and abrasion, the 55526 seal ensures long service life and reliable operation in commercial turf and drive applications.
Product Details
Manufacturer Part Number: 55526
Brand: Hydro-Gear (OEM-Spec)
Part Type: Lip Seal (Double-Lip TC Style)
Dimensions: 22 mm ID × 32 mm OD × 7 mm Thickness
Seal Profile: TC (double-lip with spring)
Seal Material: HNBR (Hydrogenated Nitrile Butadiene Rubber)
Function: Prevents hydraulic fluid leakage around rotating shafts
Application: Hydro-Gear hydrostatic transmissions, pumps, and motors
Construction: Durable elastomer with metal reinforcement and spring-enhanced lips
OEM Status: Genuine Hydro-Gear replacement part
Function
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Provides robust sealing of rotating shaft interfaces to prevent fluid leakage
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Maintains proper hydraulic pressure for smooth and efficient operation
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TC double-lip design with garter spring enhances sealing under high pressure
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HNBR material resists heat, oil, and wear for long service life
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Protects internal components from contamination by dirt, moisture, and debris
Compatible With
The Hydro-Gear 55526 Lip Seal is used in select Hydro-Gear hydrostatic drive systems, including:
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Hydro-Gear integrated transaxles
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Pump and motor assemblies requiring a 22 mm × 32 mm × 7 mm seal
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OEM parts diagrams and rebuild kits listing part number 55526
Note: Always verify compatibility by matching your Hydro-Gear transmission or pump/motor model with the official OEM parts breakdown before ordering.
How It’s Used
This double-lip TC seal installs inside a bore where a shaft passes through the housing:
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Prepare: Drain hydraulic fluid and thoroughly clean the service area.
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Access Seal Location: Disassemble transmission, pump, or motor housing as per service manual.
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Remove Old Seal: Carefully extract the worn seal without damaging the housing bore.
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Inspect Mating Surfaces: Check shaft and bore surfaces for wear, pitting, or scoring.
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Lubricate Seal: Apply light hydraulic fluid or assembly lube to the sealing lips.
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Install New Seal: Press the Hydro-Gear 55526 seal squarely into the bore using a proper seal driver tool.
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Reassemble & Test: Reassemble components, refill hydraulic fluid, and run tests to ensure leak-free operation.
Proper installation and surface preparation are critical for effective sealing and long-term performance.
Suggested Maintenance
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Periodically inspect seal areas for fluid seepage
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Maintain clean hydraulic fluid at correct levels to reduce seal wear
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Replace seals whenever related components are disassembled
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Avoid damaging sealing lips during service or installation
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Use only OEM-spec Hydro-Gear seals for correct fit and durability
The Hydro-Gear 55526 Lip Seal (22 × 32 × 7 mm, TC, HNBR) is a reliable OEM-spec solution designed to deliver leak-free sealing, protect internal hydrostatic components, and ensure long-lasting performance in compatible Hydro-Gear hydraulic drive systems.



