Pinion Gear to Ring Gear Engagement
The final position of the pinion gear is verified by using
the gear contact pattern method as described in the fol-
lowing procedure.
PROFILE
TOP LAND
GEAR TOOTH DEFINITIONS (Fig. 37):
Toe -- the portion of the tooth surface at the end to-
wards the center.
TOE
LENGTHWISE
BEARING
ARC
Heel -- the portion of the gear tooth at the outer end.
Top Land -- top surface of tooth.
HEEL
1.
side, with a gear marking compound, such as DyKemR
Paint the teeth of the ring gear, both drive and coast
ROOT
Steel Blue.
Figure 37
2.
Install the input shaft/pinion gear assembly into axle
case.
More than 35% total tooth contact
3.
pinion gear in the direction of forward travel until the ring
gear has made one complete revolution.
While applying a light load to the ring gear, rotate the
Ideal tooth contact observed on the ring gear should
cover more than35%ofeach toothsurface. Thecontact
areashouldbeinthecenterofeachtoothandextend1/3
to 1/2 way across each tooth from the toe end (Fig. 38).
1/3 to 1/2 of entire width
from small end of tooth
Figure 38
Adjustments to the gear contact position are made by
moving the input shaft/pinion gear (bearing case shims)
or by moving the differential gear case (differentialbear-
ing shims) (Fig. 39).
4
3
NOTE: Bearing case shims are available in 0.004 in.
(0.10
mm) and 0.008 in. (0.20 mm) thickness.
NOTE: Differential bearing shims are available in
0.004
(0.40
in. (0.10 mm), 0.008 in. (0.20 mm) and 0.016 in.
mm) thickness.
Study the different contact patterns (Figs. 40 and 41)
and correct gear engagement as necessary.
2
NOTE: When making changes, note that two variables
are involved (see Gear Pattern Movement Summary in
this section of this manual).
1
Example: If the pinion gear to ring gear backlash is set
correctly to specifications and the bearing case shim is
changed to adjust tooth contact, it may be necessary to
readjust backlash to the correct specification before
checking the contact pattern.
Figure 39
Input shaft/pinion gear
Bearing case shims
Differential gear case
1.
2.
3.
4.
Differential bearing
shims
Groundsmaster 4500--D/4700--D
Page 6 -- 25
Axles, Planetaries, and Brakes (Rev. B)
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