52401 – Hydro-Gear Extension Spring (Genuine OEM Part) The Hydro-Gear 52401 Extension Spring is a genuine OEM tension spring designed for use in Hydro-Gear hydrostatic transmission systems. This precision-engineered extension spring provides controlled tension within transmission linkage or control assemblies, ensuring smooth mechanical operation and accurate return movement during use. Manufactured to Hydro-Gear’s exact OEM standards, the 52401 spring delivers the proper tension rate, durability, and fit required for reliable hydrostatic drive performance. Using a genuine Hydro-Gear extension spring helps maintain correct control response and long-term operational stability in both residential and commercial mowing applications. Key Details: Manufacturer: Hydro-Gear Part Number: 52401 Part Type: Extension Spring Function: Provides tension for transmission linkage or control return Construction: High-strength spring steel Application: Hydrostatic transmission control system Installation: Direct OEM replacement Compatibility: The Hydro-Gear 52401 Extension Spring is used in select Hydro-Gear hydrostatic transaxles commonly installed in zero-turn mowers and turf equipment. Commonly associated with Hydro-Gear transmission platforms such as: EZT (ZT-2200) Series ZT-2800 Series ZT-3100 Series ZT-3400 Series These Hydro-Gear systems are widely utilized by equipment manufacturers including: Ariens Gravely Scag Husqvarna Toro Exmark Cub Cadet The genuine Hydro-Gear 52401 extension spring ensures proper linkage tension, smooth control operation, and dependable performance of Hydro-Gear hydrostatic transmission systems.