Yamaha Wolverine YX70EPNG, Service Manual

Page: 305 / 503

MIDDLE GEAR
5-92
d. Measure the gear lash while rotating the mid-
dle driven shaft back and forth.
TIP
Measure the gear lash at 4 positions. Rotate the
middle driven gear 90° each time.
e. If the gear lash is incorrect, adjust the gear
lash by middle driven pinion gear shim(s).
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EBS30210
ALIGNING THE MIDDLE GEAR
TIP
Aligning the middle gear is necessary when any
of the following parts are replaced:
• Crankcase
• Middle drive pinion gear
• Middle driven pinion gear
• Middle driven shaft bearing housing
• Middle drive shaft bearing housing
1. Select:
• Middle drive pinion gear shim(s) “1”
• Middle driven pinion gear shim(s) “2”
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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, bearing housings, and pinion
gears.
b. To find middle drive pinion gear shim thick-
ness “A”, use the following formula.
“a” = a numeral (usually a decimal number)
on the bearing housing is either added to or
subtracted from “0.6”
“b” = 17.0
“c” = 55.0
“d” = a numeral (usually a decimal number)
on the crankcase (left) specifies a thickness
of “65.0”
“e” = a numeral (usually a decimal number)
on the crankcase (right) specifies a thickness
of “9.0”
Example:
If the bearing housing is marked “-02”,
“a” is 0.58
a. 39.3 mm (1.55 in)
b. 25.3 mm (1.00 in)
4
3
b a
2
A. Middle drive pinion gear shim thickness
B. Middle driven pinion gear shim thickness
Middle drive pinion gear shim thickness
“A” = “e” + “d” - “b” - “c” - “a”
B
A
1
2