5/8" x 71" 954-04249A Lawn Mower Lower Drive Belt for Troy Bilt MTD 754-04249 954-04249 LT4200 Toro 55-7660 Murray 43066 43066MA 539116685 T110 T100 LT2000 76181-751-003 K5142-51310 13066MA 3541R

What It Is

This is a lower drive belt for lawn tractors and zero-turn mowers, connecting the engine pulley to the transmission or deck drive system. It’s designed for residential and light commercial mowing, typically on 42-inch to 50-inch decks.

Fitment & Compatibility

Before buying, verify these four items:

• Measure your old belt – Exact length is 71 inches (outer circumference) with a 5/8-inch width. If your old belt differs, it won’t fit.
• Check OEM part numbers – This belt replaces Troy-Bilt/MTD 754-04249, 954-04249A, 954-04249, and Toro 55-7660. Also fits Murray 43066, 43066MA, 539116685, and Husqvarna/Kohler K5142-51310.
• Confirm your mower model – Common compatible models include Troy-Bilt LT4200, Toro T110, T100, LT2000, and MTD 76181-751-003. Not all LT-series tractors use this belt; cross-reference your model number with the OEM list above.
• Deck size – This belt is used on 42-inch and 46-inch decks primarily. If your deck is 54 inches or larger, this belt will be too short.

Key Things to Know

• Quality – This is an aftermarket belt, not OEM Toro/MTD. Expect similar durability for residential use, but may wear faster under heavy commercial loads.
• Installation difficulty – Moderate. You’ll need to remove the deck or release tension from the idler pulley. A belt routing diagram (often under the deck or in the manual) is essential.
• Common gotcha – The belt may be slightly tighter than OEM on some models. If it won’t slide onto the pulley, loosen the idler arm fully. Do not force it, or you risk damaging the belt or pulley bearings.
• Check pulley condition – Worn or rusty pulleys will shred any belt quickly. Inspect and replace if needed before installing the new belt.

Should You Buy It

Buy this if you need a direct replacement for a worn lower drive belt on a compatible Troy-Bilt, MTD, Toro, or Murray lawn tractor with a 42–46-inch deck and you want a budget-friendly option that works well for typical home lawn care. Avoid it if you require an OEM belt for a commercial mower or if your model isn’t on the compatibility list.