SPX Stone/Fenner 1787-AC 12VDC Electric Motor, Standard Duty. This motor is used on many SPX Stone/Fenner hydraulic power units in a variety of applications from dump trailers, dump trucks, boat lifts, lift gates, tow trucks, wreckers, auto lifts, and snow plows, etc. The motor is single-terminal and has a 9-tooth spline shaft. Part number 1787-AC or 1787*AC. This motor ships as a kit with a new pump-motor shaft coupling. Kit number is KMD1. This motor is also a direct replacement for part number 4142-AC. The only difference is the 4142-AC has a black powdercoat finish.