Replacement 42" Deck Belt for Troy Bilt Bronco 42 Auto TB1942 TB2246 TB2142 42" 490-501-M044

What It Is

This is a replacement 42-inch deck drive belt designed for Troy-Bilt Bronco 42 riding mowers, specifically models TB1942, TB2246, and TB2142. It powers the mower deck blades from the engine pulley.

Fitment & Compatibility

• Deck size: Only fits 42" cutting decks. Measure your deck width to confirm.
• Troy-Bilt models: TB1942, TB2246, TB2142, and other Bronco 42 variants with a 42" stamped deck.
• OEM cross-reference: Replaces Troy-Bilt part number 490-501-M044. Check your old belt for this number.
• Measurements: Belt is approximately 1/2" wide and 96.5" long (outside circumference). Measure your old belt end-to-end to verify.
• Aftermarket note: This is a non-OEM replacement. Fit should be identical, but belt material and tension may differ slightly from the original.

Key Things to Know

• Installation difficulty: Moderate. You’ll need to remove the deck, release the idler pulley tension, and route the belt per the deck diagram. Allow 30–45 minutes.
• Belt quality: At 3.9 stars, users report it works, but some note it may stretch faster than OEM belts. Check tension after the first few hours of use.
• Common gotcha: The belt routing diagram on the deck may be faded or missing. Take a photo before removing the old belt, or look up the routing for your specific model online.
• Check pulleys: Worn or sticky idler pulleys can cause premature belt wear. Spin all pulleys by hand while the deck is off—replace any that feel rough or wobble.

Should You Buy It

If you need a budget-friendly belt for a Troy-Bilt Bronco 42 and are comfortable with moderate DIY installation, this is a solid option. It’s not the most durable belt available, but it’s a good fit for occasional mowing and will get the job done. For heavy commercial use, consider an OEM belt.