John Deere M150717 Secondary Drive Belt is designed specifically for GT, LT, LX, and SST Series lawn tractors with a 42M deck. Also known as a synchronous or timing drive belt, this secondary deck drive belt plays a crucial role in powering the lawn mower blades. It works in conjunction with the primary deck drive belt that transfers power from the engine. Crafted from strong materials, John Deere belts resist stretching and rolling over, ensuring smooth engagement and consistent power delivery. As a John Deere equipment manufacturer (OEM) part, it s quality and reliability. This belt fits a range of models including GT225-42M, GT235, GT245, LT133 or LT155 with serial numbers above 125,000, LT150, LT160, LT166 with serial numbers above 095,000, LT170, LT180, LX255, LX266, LX277, LX277AWS, LX279, LX280, LX288, LX289, and SST16. It replaces part number M141558. For assistance in finding the right John Deere part or accessory, John Deere specialists are available Monday through Friday from 8:00 AM to 5:00 PM EST. Model Number: M150717