The Stens 025-503 is a replacement wheel motor designed for specific Exmark and Toro zero-turn mower models. Manufactured by Parker, this motor ensures reliable performance and durability for commercial lawn maintenance equipment. Direct Drive System: Eliminates the need for gears, simplifying the drivetrain and reducing maintenance requirements. Heavy-Duty Bearings: Enhances durability and extends the lifespan of the motor under rigorous operating conditions. High Starting Torque: Provides robust initial movement, essential for efficient operation in demanding mowing environments. High Volumetric Efficiency: Ensures optimal hydraulic fluid flow, contributing to consistent performance and energy efficiency. Lazer Z Serial Nos. 102,000-370,000 with 52″, 60″, and 72 decks. Lazer Z HP Serial Nos. 160,000-370,000 with 44″, 48″, and 52 decks. Z 500 Series Z Master (2004 & newer) with 60″ and 72″ decks. Replaces OEM Part Numbers. When replacing a hydro pump, it’s advisable to also replace the wheel motor and hydraulic lines, flush the tanks, and install a new oil filter. Neglecting these steps could lead to premature failure of the new hydro pump due to contamination in the system. This wheel motor is engineered to meet or exceed OEM specifications, ensuring reliable performance for your lawn maintenance equipment.