1、Early fracture belt
1) without considering the inertia force of passive wheel
2) the load is too large, or due to accidents, passive wheel stalling
3) small pulleys, belt bending force

2、The belt edge wear
1) axis parallelism 2) bearing rigidity insufficient
3) belt wheel rim curved
4) the diameter of the pulley is smaller than the belt width

3、The belt tooth surface wear
1) the heavy load
2) improper or drive components for belt tension,
3) rough pulley or dust into the wear and tear "
4) because of the oil shrink belt