IDLER GEAR AND BEARING ASSEMBLY - MAINTENANCE INSTRUCTIONS
PRE-LOAD CHECK OF BEARING
Prior to installing and securing the bearing retainer, check the preload of
the bearing assembly as outlined below.
a. The rollers of the bearing are loaded between the bearing cup and bearing cones in accordance with
design requirements to provide a rigid idler gear and bearing assembly. As the bearing cones are moved
toward each other in a tapered roller bearing assembly, the rollers will be more tightly held between the cones
and cup. In the idler gear bearings, a slight pre-load is applied by means of a selected spacer ring between the
bearing cones, to provide rigidity of the gear and bearing assembly when it is mounted on its hub. This method
of pre-loading is measured in terms of "pounds-pull", by the effort required at the outer diameter of the gear to
turn the bearing cup in relation to the bearing cones.