The new sprocket is too long or stretched after use, which is difficult to adjust. The chain link can be removed according to the situation, but it must be an even number. The chain link should pass through the back of the sprocket, the locking tab should be inserted outside, and the opening of the locking tab should face the opposite direction of rotation. The sprocket should be filled with lubricating oil in time during operation. The lubricating oil must enter the fit clearance between the roller and the inner sleeve to improve the working conditions and reduce wear.