Parts for Troy-Bilt 21A-644H766: Engine Bracket / Belt / Cover Parts

Forward drive v-belt for rear-tine tillers. Replace when cracked, dried out, or flaking to restore forward motion. Verify fit with your model number.

Reverse drive belt for rear-tine tillers. Replace if worn, cracked, or slipping during reverse operation. Verify compatibility with your tiller model.

Spacer for tiller pivot idler assembly. Maintains proper spacing and alignment between idler components. Replace if worn, cracked, or missing.

Hex head screw for securing components on lawn mowers, tractors, and outdoor power equipment. Replace if missing, stripped, or damaged during maintenance.

Hex cap screw for securing components on lawn mowers, tractors, and outdoor power equipment. Replace if stripped, rusted, or missing hardware.

Hex screw fastener for securing lawn mower components. Replace if stripped, rusted, or missing to ensure proper assembly and equipment stability.

This lock washer is used frequently for a number of applications on power yard equipment. The size, 5/16, is the default for many small engine housing and manifold applications. Lock washers are used with machined bolts to fasten engine blocks to the housing of the equipment being used. The compressed washer is able to handle the constant vibration of the small gasoline engine without losing the seal between the screw or bolt and the housing. Typically these lock washers only need to be replaced when they are misplaced during repairs or when the screws that attach them have to be chiseled or cut away, meaning the washers are destroyed as well. These OEM certified replacement washers have been manufactured to the same specifications as the originals they are replacing. In addition to lawn mowers, lock washers of this type and size are frequently used on blowers, lawn tractors, cultivators, snowblowers, and trimmers. Brands compatible with this type of washer are Murray, Husky, Poulan, Bolens, Yard-Man, Cub Cadet, Troy-Bilt, Yard Machines, MTD, and Ryobi.

This is a bell-shaped washer used on lawn tractors to distribute load and provide a secure fit for bolts or fasteners. Its curved design helps maintain tension and prevents loosening due to vibration during mowing. Replace this washer if it is deformed, cracked, or missing, which can lead to loose hardware and component instability.

Hex screw for lawn mowers and outdoor power equipment. Replaces lost, stripped, or damaged hardware. Secures components and panels during assembly.

Washer for rear-tine tiller assemblies. Replaces worn, cracked, or missing washers in transmission and mounting areas. Maintains proper spacing.

Return spring for tillers. Installs on the control mechanism to provide tension and automatic return action. Replace if stretched, broken, or missing.

Idler pulley for rear-tine tillers guides and tensions drive belts. Replace if worn, cracked, or causing belt slippage. Verify fit with your model.