Parts for Troy-Bilt 21A-630B063: Engine / Pulley Parts

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.

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

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

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

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

Hex cap screw secures components on lawn tractors, tillers, snowblowers, and garden equipment. Replace if broken, stripped, 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.

Forward drive belt for rear-tine tillers. Replace if you notice slipping, reduced power transfer, or difficulty moving forward. Verify fit with your model number.

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

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

This is a hex screw used on a variety of types of lawn and garden equipment. On large machinery, it is often used to mount the gas tank. On smaller items, it tends to be used to clamp the housing together. It can secure items like plastic, metal, brick, and wood together. It measures 5/16-18 x .75 inches and is made of durable metal. In some cases, the screw can become damaged, broken, or stripped, which means it needs to be replaced.A visual inspection will indicate whether the screw is damaged. If it needs to be replaced, a hex wrench can be used to remove it from the equipment. Afterward, the replacement hex screw can be installed with the wrench before being tightened to ensure materials hold together well.This hex screw is a genuine OEM part that is sold individually. It is sourced directly from the manufacturer. The hex screw is compatible with lawnmowers, wood chippers, log splitters, snowblowers, chainsaws, edgers, tillers, leaf blowers, and string trimmers by Craftsman, Cub Cadet, Ryobi, Troy-Bilt, Husky, Broan, Yard Machines, MTD, Huskee, Montgomery Wards, Bolens, Turf King, Yard-Man, and MasterCut.

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