YG125-30A Maintenance Manual
Crankcase, crankshaft and Shift mechanism
97
Crank-shaft
Balance shaft
1.
Remove the (l
eft hand) crankcase (See “Removal of
left hand crankcase").
2.
Remove the balance shaft.
3.
Remove the crankshaft.
Notice:
While removing, you may strike the balance shaft and
crankshaft gently; however, always avoid damaging
them.
To mount the crankshaft and balance shaft:
1.
Place the right hand crankcase assembled with
variable transmission system (driving/driven shaft,
etc.) on the assembly operating table, and use a high
power electric drier to heat the right crankcase body
crankshaft bearing until the temperature at the inner
circle of the bearing reaches 106
℃
, and then
assemble the crankshaft.
2.
Use a high power electric drier to heat the right
crankcase body balance shaft bearing until the
temperature at the inner circle of the bearing
reaches 106
℃
, and then assemble the balance shaft.
Remember to align the markers on the driving and
driven gears.
3.
Mount the left hand crankcase (See “Installation of
crankcase").
Notice:
Only assemble when the temperature reaches 106
℃
,
otherwise it can’t be assembled. Never savagely
strike it!
The markers on the driving and driven gears must be
aligned.
Removal and installation of crankshaft and balance shaft
Electric drier
Balance shaft
Crank-shaft
Aligning the markers
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