California Air Tools 3010 Service Manual Page 294

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12-24 FINAL DRIVE
Bevel G ear Case
Bevel Gear Adjustment
In order to prevent one gear from moving away from the
other gear under load, the backlash and tooth contact
pattern of the bevel gears must be correct to prevent the
gears from making noise and being damaged.
When replacing any one of the backlash-related parts, be
sure to check and adjust the backlash and tooth contact.
First adjust the backlash, and then tooth contact by replac-
ing shims.
These two adjustments are of critical importance and
must be carried out in the correct sequence, using the
procedures shown.
Backlash Adjustment
Check and adjust the gear backlash when any of the
backlash-related parts are replaced with new ones.
Install the drive gear with the primary shim and assemble
the driven gear with the primary shim. Do not install the
bevel gear case holder during adjustment.
Clean any dirt and oil off the bevel gear teeth.
Install the bevel gear case and tighten the case bolts.
Check the backlash while tightening the case bolts. Stop
tightening them immediately if the backlash disappears
and change the shim to a thinner one.
Hold the driven gear shaft [A] with a v ice.
Protect the driven gear shaft with aluminum plates [B].
Set up a dial gauge [C] against the middle point [D] of the
gear dog side [E].
The middle point is position at about 23.5 mm (0.925 in.)
[F] from center.
Gear Dog [G]
To measure the backlash, turn the shaft clockwise and
counterclockwise. The distance between the highest and
lowest gauge reading is the amount of backlash.
If the backlash is not within the limit, replace the shim(s)
at the drive and/or driven gear. To increase backlash, de-
crease the thickness of the shim(s). To decrease back-
lash, increase the thickness of the shim(s).
Change the thickness a little at a time.
Recheck the backlash, and readjust as necessary.
Bevel G ear Backlash
Standard: 0.07 0.15 mm (0.0028 0.0059 in.) (at
middle of gear dog side on drive gear
shaft)
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