Subsection 13 (GEARBOX AND 4X4 COUPLING UNIT (WITH EXTERNAL SWITCHES))
This bevel gear reference number could be be-
tween - 10 and + 10.
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1. Bevel gear
2. Bevel gear reference number
Use following formula to find out value B.
Bevel gear reference number
B = (
100
) + 37.8
For example: bevel gear reference number = - 3.
B = (- 3/100) + 37.8 = 37.77
C = Distance between the shim thrust surface in
the center housing and the mating surface to
right housing.
NOTE:
For a better understanding following illus-
tration is made as a cutaway.
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1. Deep gauge — measurement
C
2. Shim surface in center housing
3. Mating surface to right housing
A =
2 mm (.0787 in)
nominal thickness of axial
needle bearing.
When the measurements are taken, calculate the
theoretical shim thickness (D) using the formula:
(D = B - C - A).
Take the obtained theoretical shim thickness (D)
and choose the corresponding shim number (E)
according to the following table.
THEORETICAL
SHIM THICKNESS
-D-
SHIM NUMBER
-E-
1.20 mm to 1.29 mm
(.0472 in to .0508 in)
120
1.30 mm to 1.39 mm
(.0512 in to .0547 in)
130
1.40 mm to 1.49 mm
(.0551 in to .0587 in)
140
1.50 mm to 1.59 mm
(.0591 in to .0626 in)
150
1.60 mm to 1.69 mm
(.063 in to .0665 in)
160
1.70 mm to 1.79 mm
(.0669 in to .0705 in)
170
1.80 mm to 1.89 mm
(.0709 in to .0744 in)
180
NOTE:
For example, if the theoretical shim thick-
ness (D) is 1.53 mm (.0602 in), choose the corre-
sponding shim number 150 (E). The shim number
150 represents a nominal value equal to 1.50 mm
(.0591 in).
Bevel Gear Axial Clearance Procedure
Use the following course of calculation to deter-
mine the theoretical shim thickness (I):
I =
F + G - H - A - E
F = Distance between mating surface of left
housing to ball bearing inner race.
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