14-82
c. REVERSE BEVEL GEAR SHIM
1) Measure the bearing height (distance H) of the new 50 x 90
x 20 mm radial ball bearing as shown, and record the
measurement.
2) Determine the calculation value using the bearing height
(distance H) and the following formula.
Formula:
Bearing height (distance H) – 20 = Calculation value
Example:
When, bearing height (distance H) is 19.95 mm (0.785 in):
19.95 – 20 = –0.05
Therefore, the calculation value is –0.05 mm (–0.002 in).
3) 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]
GEAR CASE
[2]
ENGAGEMENT
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)
• Reverse bevel gear shim selection table
[2] Calculation value
±0 (±0.000)
–0.05 (–0.002)
–
–
–0.05 (–0.002)
–0.12 (–0.005)
1
0.60 (0.024)
0.65 (0.026)
2
0.55 (0.022)
0.60 (0.024)
3
0.50 (0.020)
0.55 (0.022)
4
0.45 (0.018)
0.50 (0.020)
5
0.40 (0.016)
0.45 (0.018)
6
0.35 (0.014)
0.40 (0.016)
[3] Unit: mm (in)
Refer to page 14-80 for the information on how to read the
shim selection table and shim combination.
[1] Engagement
mark on the
gear case
