8TEN Transmission Drive Belt

The most reliable way to confirm fitment is to check your mower's owner's manual for the OEM part number. This belt is designed as a direct replacement for part number 91-2258; if your manual lists that number, this belt is engineered to match your machine's specifications.

This belt is constructed with specific materials—NR rubber, polyester cord, and Type 1 fabric cotton—designed to handle the heat and tension cycles of a walk-behind mower transmission. Generic belts often lack the specific reinforcement needed to prevent stretching or snapping under the load of a mower's drive system.

Yes, this is a V-belt, which means it relies on the wedge shape to grip the pulleys effectively. When installing, ensure the belt is seated properly in the pulley grooves; if it sits too high or low, it can cause premature wear or slippage.

Generally, you will only need basic hand tools like a socket set or wrench to remove the belt cover and loosen the tensioner. Consult your mower's service manual for the specific steps to release tension on the drive system before attempting removal.

Look for signs of fraying, cracking along the inner ribs, or a glazed, shiny appearance on the sides of the belt. If you notice your mower losing drive power or the belt slipping during operation, it is likely stretched or worn and needs to be swapped.