×
Description
55523 – Hydro-Gear Lip Seal .562″ x .875″ (OEM-Spec)
The Hydro-Gear 55523 Lip Seal is a genuine OEM-spec hydraulic sealing component engineered to provide reliable fluid containment and protect internal components in Hydro-Gear hydrostatic transmissions, pumps, and related drive systems. Precisely sized at 0.562″ inner diameter × 0.875″ outer diameter, this lip seal features a robust sealing lip designed for high-pressure environments, resisting fluid leakage while maintaining system efficiency under load. Built to Hydro-Gear’s exacting specifications, the 55523 seal ensures long-lasting service life and dependable performance in commercial and residential turf applications.
Product Details
Manufacturer Part Number: 55523
Brand: Hydro-Gear (OEM-Spec)
Part Type: Lip Seal (Hydraulic Oil Seal)
Dimensions: 0.562″ ID × 0.875″ OD
Seal Style: Standard lip seal design
Function: Prevents hydraulic fluid leakage around rotating shafts
Application: Hydro-Gear hydrostatic transmissions, pumps, and drive assemblies
Material: Durable elastomer compound (fluid-resistant)
OEM Status: Genuine Hydro-Gear replacement part
Function
-
Creates a fluid-tight seal around rotating components to prevent hydraulic oil leaks
-
Helps maintain proper hydraulic pressure in drive and pump systems
-
Protects internal components from contamination by dirt and moisture
-
Supports smooth, efficient hydraulic operation under varying loads
-
Provides consistent performance in high-pressure hydrostatic environments
Compatible With
The Hydro-Gear 55523 Lip Seal is used in select Hydro-Gear hydrostatic systems, including:
-
Hydro-Gear integrated transaxle and pump/motor units requiring this specific seal size
-
OEM parts diagrams and rebuild kits that list part number 55523
Note: Always verify compatibility against your Hydro-Gear transmission or pump model using the OEM parts breakdown before ordering.
How It’s Used
This lip seal installs inside the hydraulic housing where a rotating shaft passes through a bore:
-
Prepare System: Drain hydraulic fluid and clean the work area.
-
Access Seal Location: Disassemble the transmission or pump housing per service manual instructions.
-
Remove Old Seal: Extract the worn seal carefully, avoiding damage to the housing bore.
-
Inspect Surfaces: Check shaft and bore surfaces for wear or scoring.
-
Install New Seal: Press the Hydro-Gear 55523 lip seal evenly into the sealing bore using an appropriate seal driver.
-
Reassemble & Test: Reassemble components, refill hydraulic fluid, and test system operation for leakage and performance.
Accurate installation is essential for reliable sealing and fluid containment.
Suggested Maintenance
-
Inspect seal areas during scheduled service intervals for signs of seepage
-
Keep hydraulic fluid clean and at proper levels to reduce premature seal wear
-
Replace seals whenever related hydraulic components are disassembled
-
Avoid scratching or damaging sealing surfaces during service
-
Use only OEM-spec Hydro-Gear seals for correct fit and durable performance
The Hydro-Gear 55523 Lip Seal (.562″ × .875″) is a dependable OEM-spec hydraulic sealing solution designed to prevent leaks, protect internal components, and ensure long-lasting performance in compatible Hydro-Gear hydrostatic drive systems.



