EZYPAK 30" Sprocket Replacement for Toro TimeMaster/TurfMaster — 2-Pack Durable OEM Fit (121-9100)

The EZYPAK 121-9100 30" sprocket is a heavy-duty replacement gear engineered to restore reliable blade and drive rotation on compatible Toro TimeMaster and TurfMaster walk-behind mowers.

If your mower shows unusual drivetrain play, slipping belts, or uneven cutting after hours of use, a worn sprocket can be the culprit. This EZYPAK sprocket (also referenced as 121-9100, 120-1920, 120-7042) is manufactured from durable materials to match the fit and function of the original equipment on many 30-inch Toro and compatible Exmark models. It is supplied as a pack of two for easy simultaneous replacement of left and right sides where applicable, helping bring your mower back to consistent performance.

Which mower models will this sprocket work with?

This sprocket is designed to fit a range of Toro TimeMaster and TurfMaster 30" walk-behind mowers and several Exmark commercial 30" models. Fitment can vary by serial number, sub-model, and production date, so it's important to verify compatibility with your owner's manual or parts diagram before installing.

• Common Toro models: TimeMaster 20199, 20200, 20975–20978, 21199/21199HD, 21200, 21810–21811, 22200, 22205TE, 22207–22215, 22225.
• Also matches some Exmark Commercial 30, S-Series 30, and X-Series 30 mower variants.
• Supersedes OEM numbers 121-9100, 120-1920, 120-7042 for direct replacement.

How does this EZYPAK sprocket improve mower performance?

Replacing a worn sprocket reduces drivetrain slack and helps belts and blades maintain correct tension, translating to smoother operation and a more even cut. Because the part is made from robust materials, it offers long service life and helps prevent recurring issues tied to degraded gears.

• Restores correct chain and belt alignment to reduce slippage.
• Durable construction resists wear under normal mowing loads.
• Sold in a two-pack to replace both sides where needed and balance drivetrain wear.

What should I check before installing the part?

Always cross-check the part numbers and consult your mower’s original owner manual or parts schematic to confirm the match. Inspect adjacent components—bearings, shafts, belts and fasteners—and replace or service them if they show wear to avoid early failure of the new sprocket.

• Verify OEM numbers: 121-9100, 120-1920, 120-7042 match your parts list.
• Confirm fit by serial number and sub-model using the mower manual.
• Check belts, shafts, and hardware for wear; replace as needed during sprocket installation.

How difficult is installation and what tools are needed?

Installation is typically straightforward for anyone comfortable with basic mower maintenance. You’ll need common hand tools and possibly a puller or press for stubborn components; torque specifications should follow the manufacturer’s service manual to ensure safe reassembly.

• Basic tools: wrenches, sockets, screwdrivers, and pliers.
• Special tools: puller or press may be required for tight-fit bearings or hubs.
• Follow OEM torque specs and safety steps from the service manual.

Who is this for: This EZYPAK sprocket set is aimed at homeowners and professional landscapers who maintain Toro TimeMaster or TurfMaster 30" walk-behind mowers and compatible Exmark commercial models. It's suited for anyone replacing worn drivetrain components to restore cutting performance and extend mower life — provided you confirm part compatibility with your specific mower serial number and sub-model before ordering.