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This genuine OEM replacement friction disc wheel is designed to fit a wide range of snowblower engines. A friction wheel attaches to the friction disc of a friction drive transmission. This style of transmission is common to many lawn appliances. Rather than relying on chains or sprockets, a friction wheel transmission uses two rotating wheels to drive the axle. If one wheel is damaged, the transmission will seize up, and the engine will not run. Over time, friction plates will wear down through repeated use, and the transmission will eventually give out. Signs of a failed transmission include noticeable vibrations, poor engine performance, out-of-place revving, and a slipping engine. Replacing the friction disc will require a socket wrench to remove the wheel and hex shaft, as well as a pair of pliers to pry away any clips securing those parts into place. Be sure not to lose any of these small components, as they are needed for reassembly. Before starting any repair, be sure to drain any fuel from the appliance. This part is compatible with Murray, Snapper, and Simplicity snowblowers and is sourced from the original manufacturer. As a top of the line replacement part, it ships individually.