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CASE EXCHANGE
When the exterior of the middle gear or final
gear case is damaged and must be replaced,
pay attention to the numbers scribed on the
replacement cases. Follow assembly instruc-
tions in the appropriate section of this manual.
9-1. Middle Gear Case Replacement
A. Selection of Drive Pinion Shim
Note the number scribed on the middle
gear cases (original and replacement).
Note the original drive shim thickness:
Example: Replacement
Original
Original shim
Formula
for
Original shim
original case number)
Example: 0.10-(79.73-79.93)
0.10-(-0.2.)
0.10
0.30
Notice that the subtraction of a negative
number-(-0.20)
adding that amount as a positive number.
Use this shim and the normal instructions
for installation of middle gear components
described in Page 119, Section 6-2.
.
. .
.
.
.
. .
. .
. . . .
.
. . . .
,
. . .
. . .
.0.10 rnm
determining
new shim:
(new case number
-
+
0.20
new shim
is the same operation as
B. Selection of Driven Pinion Shim
Note the number scribed on the middle
gear cases. Proceed
Page 122, Section 6-2. E).
(
C. Final Inspection
Install
appropriate
Check tooth contact patterns and gear
lash before mounting new assembly on
machine. Refer to 6, Section 6-2D for
tooth contact pattern inspection. Page
121
9-2.
Final Gear Case Replacement
Selection of new drive pinion shim(s) and
thrust shim(s) is similar to middle gear drive
.
79.73
pinion shim determination.
.79.93
-
Drive pinion
1 .
Ring gear
2.
in above steps
as
gear
assemblies
sections of
ride
according of
this manual.
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