Stens belts are designed to withstand the rigors of a harsh working environment. M805441 Fan Belt For John Deere 3215A 3235 X740 X744 X748 X749 Designed to handle one of the toughest jobs in lawn care, Stens OEM replacement belts resist the many stresses that can prematurely shorten the life of a belt.. Admittedly, belts are a component that will eventually wear out, but the belt you choose can make a difference in how often replacement is necessary.