rotating bearing in such a way that the rollers leave
impressions on the contact surfaces of the cones.
These impressions may not be easily discerned during
normal inspection. For example, a bearing may be
brinelled if a load were applied to the inner cone of the
bearing assembly in order to force the outer cone into
the idler gear bore, thus transmitting the force through
the bearing rollers. A brinelled bearing may have a very
Refer to Fig. 3 for the location and identification of parts
and disassemble the bearing as follows:
1. Remove the six bolts and three bolt locks which
secure the bearing retainer to the idler gear, and remove
the bearing retainer.
The component parts of the idler
gear bearing are matched: therefore.
Fig. 2. Pressing Hub Out of Bearing
disassembly to ensure reassembly of
the parts in their original positions.
2. Clean the idler gear and bearing assembly with fuel
Wash the idler gear, hub, and bearing components
oil and dry it with compressed air.
thoroughly in clean fuel oil and dry with compressed air.
3. Place the idler gear and bearing assembly in an
Check the idler gear hub and spacer.
arbor press with the bearing cone or inner race
supported on steel blocks as shown in Fig. 2. While
Inspect the bearings carefully for wear, pitting, scoring
rotating the gear assembly, press the hub out of the
or flat spots on the rollers or cones. Replace the
bearing. Remove the gear assembly from the arbor
bearing if it is defective.
press and remove the bearing cones and spacers.
4. Tap the bearing cups and spacer rings from the idler
gear by using a brass drift alternately at four notches
provided around the shoulder of the gear.
Fig. 3. Idler Gear Details and Relative Locating Parts (Current Bearing)