FINAL DRIVE 12-15
Front Final Gear Case
Bearing Preload Adjustment
•
Check and adjust the bearing preload in the following
cases.
○
When any of the parts listed below are replaced with new
ones.
Pinion Gear
Collar
Shim
Tapered Roller Bearings
Pinion Gear Bearing Housing [A]
Oil Seal Collar
○
When the pinion gear slotted nut [B] is loosened; even if
the nut is not removed.
•
Install the pinion gear bearing housing and tighten the
pinion gear slotted nut to the specified torque (see Pinion
Gear Unit Assembly).
•
Do not install the oil seal and O-rings, and do not lock the
washer until the correct bearing preload is obtained.
CAUTION
To start with, choose a shim or collar so that the
bearings are just SNUG with NO play but also with
NO preload.
An over-preload on the bearings could damage the
bearings.
•
Apply specified gear oil to the bearings, and turn the gears
more than 5 turns to allow the bearings to seat.
•
Measure the bearing preload. Bearing preload is the force
or torque which is needed to start the gear shaft turning.
NOTE
○
Preload can be m easured either with a spring scale or
a beam-type torque wrench. When measured with a
spring scale, the preload is designated by force (N, kgf,
lb), and when measured with a torque wrench, it is des-
ignated by torque (N·m, kgf·m, in·lb).
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