Aligning The Middle Gear
Fragment manuala — str. 393–394
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MIDDLE GEAR
6. Measure: 11.Measure:
• Crankcase-to-middle-driven-shaft-bearing- • Middle gear backlash
housing clearance Out of specification → Refer to “MEASUR-
(with a thickness gauge) ING THE MIDDLE GEAR BACKLASH” on
7. Select: page 5-91.
• Middle driven pinion gear shim(s) “1”
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:
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• Middle drive pinion gear shim(s) “1”
a. Shims can only be selected in 0.05 mm incre- • Middle driven pinion gear shim(s) “2”
ments, therefore round off to the hundredth’s NOTE:
digit of the calculated thickness and select Select the middle driven gear shim(s) “2” by cal-
the appropriate shims with the following culating the middle drive gear shim thickness
chart. and then measuring the middle gear backlash.
b. For example, the clearance between the
crankcase and the middle driven shaft bear-
ing housing is 0.42 mm. Therefore, the chart c
instructs you to round off the 2 to 0. Thus, you
should use one 0.40 mm shim. a b
A
Hundredth Rounded value 1
0, 1, 2 0
3, 4, 5, 6, 7 5
8, 9 10
Shims are supplied in the following thickness- d
es. f
Middle driven pinion gear shim e
Thickness (mm)
0.10 0.15 0.20 0.30 0.40 0.50 B 2
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8. Loosen:
• Middle driven shaft bearing housing bolts
9. Install:
A. Middle drive pinion gear shim thickness
• Middle driven pinion gear shim(s)
B. Middle driven pinion gear shim thickness
10.Tighten:
• Middle driven shaft bearing housing bolts ▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Position the middle gears with the appropri-
Middle driven shaft bearing hous- ate shim(s) that has had its respective thick-
T.
R.
ing bolt ness calculated from information marked on
25 Nm (2.5 m·kg, 18 ft·lb) the crankcase and middle driven pinion gear.
LOCTITE® b. To find middle drive pinion gear shim thick-
ness “A”, use the following formula.
5-92
MIDDLE GEAR
Middle drive pinion gear shim thickness
“A” = “c” - “a” - “b”
“a”= 65.00
“b”= 18.94
“c”= a numeral on the lower crankcase, to be
divided by 100 and added to “84”
“e” = Measured value
“f” = a numeral on the lower crankcase, to be
divided by 100 and added to “87”.
Example:
“a” is 65.00
“b” is 18.94
If the lower crankcase is marked “45”
“c” is 84.45 (i.e., 84.00 + 0.45 = 84.45)
“A” = 84.45 - 65.00 - 18.94 = 0.51
Round off to the hundredths digit and select Example:
the appropriate shim(s). If the middle driven pinion gear is marked “-
NOTE:
03”
“d” is 33.97 (i.e., 34.00 + (- 0.03) = 33.97)
In the above example, the calculated number is
“e” is 54.49
0.51. The chart instructs you to round off the 1 to
If the lower crankcase is marked “95”
0. Thus, the shim thickness is 0.50 mm.
“f” is 87.95 (i.e., 87.00 + 0.95 = 87.95)
Hundredth Rounded value “B” = 33.97 + 54.49 - 87.95 = 0.51
Round off to the hundredths digit and select
0, 1, 2 0 the appropriate shim(s).
3, 4, 5, 6, 7 5 NOTE:
8, 9 10 In the above example, the calculated number is
0.51. The chart instructs you to round off the 1 to
Shims are supplied in the following thickness- 0. Thus, the shim thickness is 0.50 mm.
es.
Hundredth Rounded value
Middle drive pinion gear shim
Thickness (mm) 0, 1, 2 0
0.15 0.30 0.50 3, 4, 5, 6, 7 5
c. To find middle driven pinion gear shim thick- 8, 9 10
ness “B”, use the following formula. Shims are supplied in the following thickness-
Middle driven pinion gear shim thickness es.
“B” = “d” + “e” - “f”
Middle driven pinion gear shim
“d” = a numeral on the middle driven pinion Thickness (mm)
gear, to be divided by 100 and either added 0.10 0.15 0.20 0.30 0.40 0.50
to or subtracted from “34”
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5-93