Sprocket

The sprocket engages with bushing of tack link, and drives the vehicle. Abrasion occurs to various parts around the sprocket while it is running. Knowing the place to be worn is not difficult if we understand how power is transferred from sprocket to track link assembly. On a new machine, the link pitch (center distance between link pins) is equal to the sprocket pitch (distance between two teeth along the pitch line of sprocket).

In many hours of operation, the sprocket pitch will be shortened slightly by the worn tooth surface, whereas the link pitch will be extended by the worn pin O.D. and bushing I.D. In the lapse of time, both pitches will be more unmatched to each other. If the sprocket is used continuously under such a condition, the bushing O.D. and sprocket tooth surface will have to the abnormal wear, shortening the sprocket life.