A weak or dead plow motor is the number one cause of plow failure. Replace yours with the Genuine Fisher 21500K-1, the official OEM 12-volt motor, to restore your plow's original performance. This is the heart of your hydraulic system, built to withstand extreme cold and heavy use. This 4.5″ motor is the standard for most modern Fisher and Western plows. It's a 2-terminal (2-post), clockwise rotation motor with a slotted shaft, designed to drive your hydraulic pump. This is a brand new, factory-original part, not a rebuild or an aftermarket knock-off. Product Features & Specifications: Part Number: 21500K-1 Brand: Fisher (Genuine OEM) Application: Hydraulic Pump Motor Voltage: 12V DC Diameter: 4.5 Inches Rotation: Clockwise (CW) Shaft: Slotted Terminals: 2 (Two-Post) Direct Aftermarket Replacement This is the genuine factory part and is a direct replacement for several part numbers, including: Replaces Fisher Part #: 21500, 21500K, 66503 Replaces Western Part #: 21500, 21500K, 21500K-1, 56363 Replaces Buyers/S.A.M. Part #: 1306326 Compatibility: This motor is used on a wide range of plow models, including: Fisher: Minute Mount 2 (MM2) and UltraMount systems. Fits models like HD, HD2, HDX, LD, SD, XLS, Xtreme V, and XV2. Western: UltraMount and UltraMount 2 systems. Fits models like Pro-Plow, Pro Plow Series 2, MVP Plus, MVP3, and Wide-Out.