Figure 8-4. Nominal shims for bearing retainers.

TM 9-2520-249-34&P

8-6.

Determining Nominal Shim Between Cross

8-7.

Determining Nominal Shim Between Driven

Shaft

Left

Bearing

Retainer

and

Bevel Gear (Right Bearing Retainer and

Transmission Housing

a. Install outer race of bearing assembly

10947307 into retainer assembly 2520-915-6534 (para

3110-100-5480 into right bearing retainer assembly

7-67).

2520-915-6565 (para 7-67).

Position the retainer

b. Assemble the driven gear and cross shaft

assembly, bearing race upward, on a level surface.

b. Position the cross shaft, nut upward, into

assembly (para 7-79).

c. Position the left bearing retainer assembly,

the retainer assembly. Rotate the shaft and gear

assembly to firmly seat the bearing (8356606)

bearing race upward, on a level surface.

components.

d. Position the cross shaft, nut downward, into

c. Measure and record the vertical distance E

the retainer assembly. Rotate the shaft and gear

(fig. 8-4)

from the outer flange surface of the

assembly to firmly seat the components of bearing

retainer, to the upper end surface of the teeth on the

assembly 10947307.

driven gear.

e. Measure and record the vertical distance B

d. Calculate shim pack X (fig. 8-4) by

(fig. 8-4) from the outer flange surface of the retainer to

substituting dimensions for E, F and BB in the formula X

the lower surface of the teeth on the driven gear.

= E + F - BB.

NOTE

E was obtained in c, above; F is the moutning

dimension (MD) etched on the driven gear; BB

is stamped on a web of the bevel gear

housing.

e. Select the combination of shims 8356537-1,

8356537 2 and 8356537-3 which will most nearly equal

f. Install the shaft and gear assembl y into the

bevel gear housing. Install shims X (fig. 8-4) and the

right bearing retainer (refer to para 8-11, step 2, below).

Rotate the driven gear while tightening the retainer

bolts. Check for torque required to slowly rotate the

cross shaft while tightening the bolts (use a pound inch

torque wrench and socket wrench 28, table 3-1, para 8-

11, step 6, below).

g. If torque exceeds 2 pound inches when the right

retainer is tight, remove the left retainer and add shims

to shim pack Y (fig. 8-4) until torque does not exceed

the limit.

h. End play of the cross shaft should not exceed

0.0015 inch when both bearing retainers are tight but

Figure 8-4. Nominal shims for bearing retainers.

may be zero is the torque does not exceed 2 pound

inches. Shims are removed from shim pack Y (fig. 8-4)

f. Calculate shim pack Y (fig. 8-4) by substituting

(at left bearing retainer) to reduce end play.

dimensions for B, F and AA in the formula Y = B - F -

NOTE

AA.

If trouble is encountered in arriving at an

NOTE

adjustment that is within both the torque and

Dimension B was obtained in e, above;

end play limits, disassemble the parts and

dimension F is

the gear mounting distance

inspect the bearings for dirt. Clean them and

(MD) etched on the driven gear; dimension AA

lubricate with recommended transmission fluid.

is stamped on a web in the bevel gear housing.

g. Select the combination of shims 8356537

8-8.

Establishing Proper Backlash and Gear

1, 8356537 2 and 8356537 3 which will most nearly

Tooth Contact Between Drive and Driven

equal Y (fig. 8-4). Install the shims and left bearing

Bevel Gears

retainer into the bevel gear housing left side (para 8-11,

a. After cross shaft end play and bearing

step 4, below).

8-3