PRIMARY SUN GEAR (JLG JL91144187)

A worn primary sun gear can cause drivetrain noise and eventual power loss. This aftermarket replacement part references JLG catalog number JL91144187. The primary sun gear is a central component in a planetary gear set, transmitting torque from the input to the surrounding planet gears. When the gear teeth become chipped or worn, the gear set may slip or fail to engage properly, leading to intermittent or complete loss of drive function. In a typical work environment, this part operates under continuous load and high rotational speeds. Verify the serial number or application, then call (562) 693-7748.

Part number variants: JL91144187, jl91144187