21544005 – Hydro-Gear O-Ring (Replaces Hydro-Gear 52250) Genuine OEM Seal The Hydro-Gear 21544005 O-Ring is a genuine OEM replacement sealing ring designed to provide a leak-proof seal in compatible Hydro-Gear hydrostatic transmissions, transaxles, and hydraulic drive systems. Replacing the previous Hydro-Gear part number 52250, this precision-manufactured O-ring helps maintain proper hydraulic pressure, prevents fluid leaks, and protects internal transmission components from contamination. Manufactured from high-quality oil-resistant elastomer, the 21544005 O-Ring is engineered to withstand hydraulic fluid, heat, pressure, and continuous operation in demanding commercial and residential mowing applications. Installing a genuine Hydro-Gear OEM seal helps ensure reliable transmission performance and extends the service life of your hydrostatic drive system. Product Details Part Number: 21544005 Replaces: Hydro-Gear 52250 Brand: Hydro-Gear Part Type: O-Ring Function: Seals hydraulic components to prevent fluid leaks Material: Oil-Resistant Nitrile Rubber (OEM Specification) Installation: Direct OEM Replacement OEM Status: Genuine Hydro-Gear OEM Part Key Features Genuine Hydro-Gear OEM O-ring Replaces OEM part number 52250 Provides a reliable hydraulic seal Resistant to hydraulic oil, heat, and pressure Helps prevent fluid leaks and contamination Maintains proper hydraulic system pressure Precision-manufactured for OEM fit Direct replacement with no modifications required Function The 21544005 O-Ring creates a tight seal between hydraulic components, preventing oil leakage while maintaining the pressure required for efficient hydrostatic transmission operation. A properly functioning O-ring helps protect internal components, reduce maintenance, and ensure smooth equipment performance. Compatible Equipment The Hydro-Gear 21544005 O-Ring is used in selected Hydro-Gear hydrostatic transmissions and transaxles found on equipment from manufacturers including: SCAG Toro Exmark Wright Ariens Gravely Ferris Hustler Bad Boy Bobcat Cub Cadet Dixie Chopper Spartan Other outdoor power equipment utilizing compatible Hydro-Gear transmissions Always verify your Hydro-Gear transmission model, service manual, and OEM part number before ordering to ensure proper compatibility. Who Is This For? Commercial landscapers Lawn care professionals Equipment repair technicians Fleet maintenance departments Homeowners maintaining hydrostatic mowers Hydro-Gear transmission service professionals Recommended Applications Ideal for: Hydrostatic transmission repairs Hydraulic leak repairs Transmission rebuilds Preventive maintenance Seal replacement Hydraulic system servicing Pros Genuine Hydro-Gear OEM quality Direct replacement for Hydro-Gear 52250 Excellent resistance to hydraulic fluid and heat Helps prevent leaks and pressure loss Precision OEM fit Long service life Easy installation Cons Compatible only with specified Hydro-Gear applications O-ring should be lubricated with clean hydraulic oil during installation to prevent damage Comparison – Hydro-Gear 21544005 OEM O-Ring vs Aftermarket O-Rings Hydro-Gear 21544005 Genuine OEM O-Ring Exact OEM dimensions Premium oil-resistant elastomer Superior sealing performance Designed specifically for Hydro-Gear transmissions Long-lasting durability Aftermarket O-Rings May vary in dimensions and material quality Variable resistance to hydraulic fluids Potential sealing inconsistencies Shorter service life Why Buy from Barry's Power Equipment? Barry's Power Equipment supplies genuine Hydro-Gear OEM replacement parts trusted by commercial landscapers, equipment dealers, and professional repair technicians. Genuine OEM Hydro-Gear replacement parts Fast nationwide shipping Competitive pricing Expert technical support Extensive inventory for Hydro-Gear, SCAG, Toro, Exmark, Wright, Ariens, Gravely, Ferris, Hustler, Kawasaki, Kohler, Honda, Briggs & Stratton, Cub Cadet, John Deere, STIHL, and many other leading outdoor power equipment brands.
