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ENG
EAS00452
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 shaft shim(s)
1
• middle driven shaft shim(s)
2
NOTE:
@
Select the middle driven shaft shim(s)
2
by
calculating the middle drive shaft shim thick-
ness and then measuring the middle gear
backlash.
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a. Position the middle gear with the appropri-
ate shim(s)
1
and
2
that has had its
respective thickness calculated from infor-
mation marked on the crankcase and the
end of the middle drive gear.
1
Middle drive gear shim thickness “A”
2
Middle drive gear shim thickness “B”
b. To find middle drive shaft shim thickness
“A”, use the following formula.
a
= “65.00”
b
= bearing thickness constant
c
= a numeral on the upper crankcase near
the main bearing selection numbers and which
is added to the nominal size “84”
Example:
a
is 65.00
b
is 18.94
If the upper 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
the appropriate shim(s).
Middle drive shaft shim thickness
“A” =
c
–
a
–
b
MIDDLE GEAR