MTD Snowblower Gearbox Worm Gear 917-1425

Basic information

• Part name: Snowblower gearbox worm gear
• Manufacturer: MTD
• Category: Snowblower drivetrain and gearbox components
• Primary function: Transfers rotational motion through the gearbox to change speed or direction of rotation

Installation & compatibility

• Compatible models: Fits select MTD, Craftsman, Troy-Bilt, and Yard-Man snowblowers; confirm compatibility using your models parts diagrams
• Installation difficulty: Medium; requires accessing the gearbox assembly and positioning the gear correctly
• Tools required: Wrench set, socket set, pliers

Additional information

This snowblower gearbox worm gear, part number 917-1425, installs in the gearbox where it engages mating gears to transfer motion and adjust rotational direction or speed. Worm gears help produce controlled movement between intersecting gear shafts.

If the worm gear wears, chips, or becomes damaged, the gearbox may not transfer motion smoothly. You might notice grinding sounds, vibration, resistance, or inconsistent drive response if the gear does not mesh correctly with other components.

Disconnect the spark plug wire before starting the repair to prevent accidental startup. Gearbox and gear surfaces can have sharp edges, so wearing work gloves can help protect your hands during installation. Make sure the worm gear is fully seated and meshes cleanly with mating parts before using the snowblower.

Snowblower gearbox worm gear 917-1425 replaces part numbers 717-1425 and 717-0300.