MIDDLE GEAR
5-72
6. Measure:
• Crankcase-to-middle-driven-shaft-bearing-
housing clearance
(with a thickness gauge)
7. Select:
• Middle driven pinion gear shim(s) “1”
▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼
a. Shims can only be selected in 0.05 mm incre-
ments, therefore round off to the hundredth’s
digit of the calculated thickness and select
the appropriate shims with the following
chart.
b. For example, the clearance between the
crankcase and the middle driven shaft bear-
ing housing is 0.42 mm. Therefore, the chart
instructs you to round off the 2 to 0. Thus, you
should use one 0.40 mm shim.
Shims are supplied in the following thickness-
es.
▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲
8. Loosen:
• Middle driven shaft bearing housing bolts
9. Install:
• Middle driven pinion gear shim(s)
10.Tighten:
• Middle driven shaft bearing housing bolts
11.Measure:
• Middle gear backlash
Out of specification → Refer to “MEASUR-
ING THE MIDDLE GEAR BACKLASH” on
page 5-71.
EAS25930
ALIGNING THE MIDDLE GEAR
NOTE:
Aligning the middle gear is necessary when any
of the following parts are replaced:
• Crankcase
• Middle drive shaft
• Middle driven shaft bearing housing
1. Select:
• Middle drive pinion gear shim(s) “1”
• Middle driven pinion gear shim(s) “2”
NOTE:
Select the middle driven gear shim(s) “2” by cal-
culating the middle drive gear shim thickness
and then measuring the middle gear backlash.
▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼
a. Position the middle gears with the appropri-
ate shim(s) that has had its respective thick-
ness calculated from information marked on
the crankcase and middle driven pinion gear.
b. To find middle drive pinion gear shim thick-
ness “A”, use the following formula.
Hundredth Rounded value
0, 1, 2 0
3, 4, 5, 6, 7 5
8, 9 10
Middle driven pinion gear shim
Thickness (mm)
0.10 0.15 0.20 0.30 0.40 0.50
T
R
.
.
Middle driven shaft bearing hous-
ing bolt
25 Nm (2.5 m·kg, 18 ft·lb)
LOCTITE
®
A. Middle drive pinion gear shim thickness
B. Middle driven pinion gear shim thickness
c
a
b
A
1
2
f
d
e
B
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