We’re in the process of rebuilding an 18M Caterpillar Grader Circle & Drawbar assembly. These pics are of the disassembled circle drive motor. The pinion gear is broken, or shattered, into multiple pieces. It’s basically grenaded. The splined shaft which mates to & enagaes with the pinion gear has the splines completely stripped & wiped out. This kind of damage is due to the shim stack in the circle drive motor being too short which puts excessive pressure from the moldboard into the drive motor rather than the blade giving away, or ratcheting out. We’ll get it rebuilt with all new internals as well as a new pinion gear & we will set it up with a taller shim stack as well.