SHAFT DRIVE
4-97
b. To find final drive pinion gear shim thickness
“A”, use the following formula:
Where:
a = 84
b = a numeral on the final gear case, to be di-
vided by 100 and added to “83”.
Example:
If the final drive pinion gear is marked “+01”
and the final gear case is marked “50”:
Therefore, the calculated final drive pinion
gear shim thickness is 0.51 mm. Shim sizes
are supplied in the following thicknesses.
Since the final drive pinion gear shims are
only available in 0.10 mm increments, round
off to the hundredths digit.
In the example above, the calculated final
drive pinion gear shim thickness is 0.51 mm.
The chart instructs you to round off the 1 to 0.
Thus, you should use a 0.50 mm final drive
pinion gear shim.
c. To find ring gear shim thickness “B”, use the
following formula:
Where:
c = a numeral on the final gear case, to be di-
vided by 100 and added to “45”.
d = a numeral usually on the outside of the
ring gear bearing housing, to be divided by
100 and added to “3”.
e = a numeral (positive or negative) on the in-
side of the ring gear, to be divided by 100 and
added to “35.40”.
Final drive pinion gear shim thickness
A = (84 + a/100) - (83 + b/100)
A = 84 - (83 + 50/100)
= 84 - (83 + 0.49)
= 84 - 83.49
=0.51
1
a
b
A
c
f
d
e
B
2
Final drive pinion gear shims
Thickness (mm)
0.30 0.40 0.50
Hundredth Rounded value
0, 1, 2 0
3, 4, 5, 6, 7 5
8, 9 10
Ring gear shim thickness
B = (45 + c/100) + (3 + d/100) - [(35.40 -
e/100) + f]
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