TOHATSU BFT115A Service Manual page 591

FORWARD BEVEL GEAR SHIM
Assemble the outer race (1) and inner race (2) of a new
taper bearing (50 × 90 × 28 mm), and turn the outer
race two or three turns to seat the bearing.
If using a depth gauge (3), measure the bearing height
(F) from the outer race end to the inner race end as
shown, and record the measurement.
If using a vernier caliper (4), place the assembled taper
bearing on the smooth side of the gauge adapter
special tool (or flat, hard surface).
Press the outer race down over the inner race and
measure the bearing height (F) (5).
TOOL:
Gauge adapter, 100 mm (6)
Remove the taper roller bearing inner race (1) from the
outer race.
Measure the inner race height (K) of the bearing as
shown, and record the measurement.
Calculate the tolerance using the measurement F, K
and following formula.
Formula: Tolerance = F - K
Example:
When measurement (F) is 28.05 mm (1.104 in) and
measurement (K) is 28.00 mm (1.102 in):
Tolerance = 28.05 - 28.00 = 0.05
The tolerance is 0.05 mm (0.002 in).
Cross reference the tolerance calculated in the previous
step and forward bevel gear shim selection table to
determine the required thickness of the shim (Sf).
Forward bevel gear shim selection table (Counter
rotation type)
Tolerance
0 – +0.05
+0.05 – +0.10
+0.10 – +0.15
Refer to page 17-44 for information on how to read the
shim selection table and shim combination.
Select the shims from the forward bevel gear shims of
different thickness to obtain the required thickness (Sf)
by combining the shims.
GEAR CASE (COUNTER ROTATION)
(2)
070PJ-ZY30100
(1)
(6)
MEASUREMENT K:
(1)
Unit: mm
Shim thickness
0.45
0.40
0.35
(1)
(3)
(4)
(2)
17-45
(5)