14-39
b. FORWARD BEVEL GEAR SHIM
1) Assemble the outer race and the inner race of the new 50 x
90 x 28 mm taper bearing, and turn the outer race two or
three turns.
2) Measure the bearing height (distance F) from the outer race
end to the inner race end as shown, and record the
measurement.
3) Determine the calculation value using the bearing height
(distance F) and the following formula.
Formula:
Bearing height (distance F) – 28 = Calculation value
Example:
When bearing height (distance F) is 28.05 mm (1.104 in):
28.05 – 28 = 0.05
Therefore, the calculation value is 0.05 mm (0.002 in).
4) Cross reference the calculation value and the engagement
mark located on the trim tab installation part of the gear
case, and select the shim of the appropriate thickness from
the shim selection table accordingly.
• Shim type table
[1]
OUTER RACE
[2]
INNER RACE
[1]
GEAR CASE
[2]
EMGAGEMENT
MARK
[1] Shim type
[2] Thickness
[3] Forward bevel gear shim A
0.10 mm (0.004 in)
[4] Forward bevel gear shim B
0.15 mm (0.006 in)
[5] Forward bevel gear shim C
0.30 mm (0.012 in)
[6] Forward bevel gear shim D
0.50 mm (0.020 in)
• Pinion gear shim selection table
[2] Calculation value
+0.10 (+0.004)
+0.05 (+0.002)
–
–
+0.05 (+0.002)
±0 (±0.000)
1
0.40 (0.016)
0.45 (0.018)
2
0.35 (0.014)
0.40 (0.016)
3
0.30 (0.012)
0.35 (0.014)
4
0.25 (0.010)
0.30 (0.012)
5
0.20 (0.008)
0.25 (0.010)
6
0.15 (0.006)
0.20 (0.008)
[3] Unit: mm (in)
Refer to page 14-38 for the information on how to read the
shim selection table and shim combination.
[1] Engagement
mark on the
gear case
