81
DE655A
DE672
6. Place the assembled secondary output driven shaft
assembly (from step 4) into the transmission case;
then lightly coat the teeth with machinist’s dye.
Rotate the shafts through several rotations in both
directions. Gear contact should center between the
root and top of gear teeth.
DE657A
7. To adjust tooth contact, use the following chart to
correctly shim the secondary bevel drive gear.
8. After correct tooth contact is established, proceed to
Checking Backlash in this sub-section.
Checking Backlash
1. If removed, install the secondary drive/bevel gear
shaft into the transmission case; then tighten the nut
to 80 ft-lb.
2. Install the secondary driven output shaft into the gear
case and seat firmly.
3. Mount the dial indicator so the tip is contacting a
tooth on the secondary drive bevel gear.
4. While rocking the drive bevel gear back and forth,
note the maximum backlash reading on the gauge.
DE658A
5. Acceptable backlash range is 0.127-0.381 mm
(0.005-0.015 in.).
Correcting Backlash
NOTE: If backlash measurement is within the
acceptable range, no correction is necessary.
1. If backlash measurement is less than specified,
remove an existing shim, measure it, and install a
new thicker shim.
2. If backlash measurement is more than specified,
remove an existing shim, measure it, and install a
thinner shim.
NOTE: Continue to remove, measure, and install
until backlash measurement is within tolerance. Note
the following chart.
After backlash and tooth contact are within specifica-
tions, apply red Loctite #271 to the driveshaft threads and
driven output shaft threads; then using new nuts, tighten
the output drive shaft nut to 80 ft-lb and the output drive
yoke nut to 72 ft-lb.
Assembling Gear Case
1. Install new bearings and seals in the left-side and
right-side cases as required.
Tooth Contact
Shim Correction
Contact at Top
Increase Shim Thickness
Contact at Root
Decrease Shim Thickness
Backlash Measurement
Shim Correction
Under 0.127 mm (0.005 in.)
Increase Shim Thickness
At 0.127-0.381 mm (0.005-0.015 in.)
No Correction Required
Over 0.381 mm (0.015 in.)
Decrease Shim Thickness
