Determining Actual Shim Between Bevel Drive Gear Support and Carrier

TM 9-2520-249-34&P

b. Using wrench assembly (30, table 3-1) (fig.

8-3)

check the torque required to slowly rotate the

bevel drive gear within the carrier. At zero end play,

torque should not exceed 2 pound inches. If greater

than this figure, add shims to increase the end play - but

do not let the end play exceed 0.0015 inch.

NOTE

If trouble is encountered in arriving at an

adjustment that is within both the torque

and end play limits, disassemble the parts

and inspect the bearings for dirt. Clean

them and lubricate with recommended

transmission fluid.

TABLE 3-1

Figure 8-2. Nominal shims for bevel drive gear support

and carrier.

b. Position gear 8356379, teeth upward, on a

level surface. Position the assembled carrier 8356806,

larger diameter down, over gear 8356379. Rotate the

carrier to seat bearing assembly 10947303 firmly.

c. Measure and record the vertical distance

Figure 8-3. Checking preload torque of bevel drive gear

H, from the flange surface of carrier 8356806 to the end

bearings.

surface of gear 8356379.

d. Measure and record the thickness of flange

8-5.

Determining Nominal Shim B etween Bevel

Drive Gear Carrier and Transmission

e. Position the support 8356510, bearing

Housing

upward, on a level surface.

Remove carrier 8356806 from gear

a. Nominal shim Z (fig. 8-2), positions the

8356379. Install the gear, teeth upward, on support

bevel drive gear in approximately the correct relation to

8356510. Rotate it to seat bearing 8356605 firmly.

the bevel driven gear's installed position.

g. Measure and record the vertical distance H'

b. Calculate

shim

substituting

(fig. 8 -2) from the outer flange of support 8356510 to

dimensions previously recorded for H, G and CC, in the

the end surface of gear 8356379.

formula Z = H + G - CC.

h. Substituting the dimensions obtained in c, d

NOTE

and g, above, in the formula W = H'-(H + X), calculate

Dimension H was measured and recorded in

the thickness of nominal shim pack W. Select the

paragraph 8 3c, above; dimensions CC and G

proper combination of shims 8356572 1, 8356572 2 and

were recorded, per instructions in paragraph

8356572 3 which most nearly equals the dimension

8 -2d, above.

obtained for W.

c. Select the proper combination of shims

Assemble the bevel drive gear assembly as

8356572 1, 8356572 2 and 8356572 3 which will most

outlined in chapter 7, section XIV.

nearly equal dimension Z.

d. Do not install the bevel drive gear

8-4.

Determining Actual Shim Between Bevel

assembly until procedures in paragraphs 8 6 and 8-7,

Drive Gear Support and Carrier

following, are completed.

a. When assembly of the bevel drive gear

assembly is completed, check the end play of the gear.

It should not exceed 0.0015 inch. If end play exceeds

this amount, remove shims to reduce it. Reassemble

the gear, carrier and support.

8-2