California Air Tools 3010 Service Manual Page 219

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FINAL DRIVE 11-15
Front Final Gear Case (KAF620E/H)
If the preload is out of the specified range, replace the
collar and/or shim(s).
To increase preload, decrease the size of the shim(s)
or collar. To decrease preload, increase the size of the
shim(s)orcollar.
Change the thickness a little at a time.
Recheck the bearing preload, and readjust as necessary.
Measure the bearing preload using a spring scale.
Using Spring Scale
Pinion Gear Bearing
Preload:
1.5 3.0 N (0.15 0.30 kg)
Hook the spring scale [A] on the handle at a point 200
mm (7.87 in.) [B] apart from the center of the gear shaft.
Hold the bearing housing in a vise so that the gear shaft
is vertical.
Apply force to the handle horizontally and at a right angle
to it.
Special Tool - Pinion Gear Holder: 57001-1281 [C]
Measure the bearing preload using a torque wrench [A].
Using Torque Wrench
Pinion Gear Bearing Pre lo ad Torque:
0.3 0.6 N·m (0.03 0.06 kgf·m, 2.6 5.2 in·lb)
Special Tool - Pinion Gear Holder: 57001-1281 [B]
Backlash Adjustment
Check and adjust the gear backlash when any of the
backlash-related parts are replaced with new ones.
Clean any dirt and oil off the bevel gear teeth.
Assemble the front final gear case (see Front Final Gear
Case Assembly). Do not install the O-rings during adjust-
ment.
Check the backlash during tightening of the ring gear
cover bolts and stop tightening them immediately if the
backlash disappears. Then, change the ring gear shim
to a thinner one.
Set up a dial gauge against a ring gear tooth to check gear
backlash shown.
To measure the backlash, move the left front axle (ring
gear side) back and forth while holding the pinion gear
steady. The difference between the highest and the low-
est gauge reading is the amount of backlash.
If the backlash is not within the limit, replace the ring gear
shims. To increase backlash, decrease the thickness of
the shim(s). To decrease backlash, increase the thick-
ness of the shim(s).
Change the thickness a little at a time.
Recheck the backlash, and readjust as necessary.
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