California Air Tools 3010 Service Manual Page 285

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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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