The tightening procedure and torque requirement is critical in keeping the clamp tight and also has a significant affect on the bearing life of the axles with internal bearings.
Clamp Tightening Procedure:
1. Check axle and clamp for burs on mating surfaces.
2. Remove end play between wheels by sliding wheels toward the fixed end of axle.
3. Position clamp snugly against the end wheel.
4. Tighten the u-bolt evenly to 57ft/lbs. (U-bolt must be tightened first.)
5. Tighten set screws to 37 ft/lbs. (Some clamps do not have set screws).
6. If axle has an internal bearing, check that it turns freely. You should be able to turn bearing with your fingers. If rotation is jerky, loosen set screws and u-bolt until bearing turns smoothly. It may be necessary to loosen and reposition clamp.
The torque requirement is recommended for axles without internal bearings, but is not critical.
When installing a roller axle with an internal bearing onto a support bracket, it is important to keep the roller axle aligned as straight as possible to the installed position. If the roller assembly is significantly out of line when sliding it unto a fixed support, the inner race of the bearing may crack and cause premature bearing failure.