138-508-1 MTD Lawn Tractor - Overview

This Washer-Lock 5/16 is a silver, metal part that is sold individually and comes direct from the manufacturer. With a 5/16 Inch Interior Diameter and 1/2 Inch Outside Diameter, it is used to prevent the nut from backing off and becoming loose on the pulley shaft, and is attached to the drive belt pulley assembly. You will know if you nee...Read mored this because your owners manual will specify it, or the model number of your machine will correspond with this part. If the part is broken due to fatigue, the shafts will free spin when they should be locked together, and must be replaced.

This manufacturer-certified Hex Bolt, measuring 5/16-18 x .75 inch, is a gold, metal, individually sold bolt. It can be installed using a wrench or socket and torque wrench, by tightening to manufacturer specifications. If damaged (likely due to fatigue) the threads will be stripped, or the ends rounded off. If broken or missing, it sho...Read moreuld be replaced. Refer to your owners manual or model number to ensure you are purchasing the correct part.

This is an authentic replacement part sourced directly from the manufacturer. The lock washer is commonly found in yard tools from Ryobi and MTD, such as trimmers, tillers, edgers, and lawn tractors. This part is made of metal, and may be found in various locations in the machine, depending on model. You may require a wrench when replacing this item. This product is available as an individual replacement part.