Feb 16, 2018 08:56 AM
There are sometimes multiple ways to assemble parts when repairing farm equipment. The secret to optimizing repairs is to follow the “preferred” procedure.
Installing eccentric lock collars on bearings is a good example. When installing a bearing on a shaft that rotates, lock the bearing’s lock collar in the direction the shaft turns. If the shaft is stationary while the bearing and bearing housing rotate around it, the lock collar should be locked in the direction the housing rotates.
I tried to analyze the physics and logic behind which direction to lock an eccentric collar, gave myself a serious headache, and finally consulted several engineers with bearing companies. “Mirror the direction the shaft rotates,” or “Match the direction the bearing rotates if the shaft is stationary,” was their unanimous answ
It was mentioned that when “setting” a lock collar on a bearing, more pounding is not always better. Hammering the set hole on a lock collar until it’s severely distorted risks creating so much torque between the lock collar and the bearing’s eccentric ring that it cracks the center race of the bearing. A properly set lock collar has only a minor distortion, perhaps a slightly raised edge, on the rim of the setting hole.