Yamaha YFM45FAR, Service Manual

Page: 220 / 405

4 - 82
ENG
MIDDLE GEAR
4.Check:
●
O-ring
Damage
→
Replace.
●
Bearings
Pitting/damage
→
Replace.
5.Check:
●
U-joint movement
Roughness
→
Replace U-joint.
SELECTING THE MIDDLE DRIVE AND
DRIVEN GEAR SHIM
When the drive and driven gear, bearing
housing assembly and/or crankcase replaced,
be sure to adjust the gear shim
1
.
1.Select:
●
Middle drive gear shim
1
●
Middle driven gear shim
2
*****************************************************
Selection steps:
●
Position middle drive and driven gear by
using shims
1
and
2
with their respective
thickness calculated from information
marked on crankcase, bearing housing and
drive gear end.
1
Shim thickness “A”
2
Shim thickness “B”
●
To find shim thickness “A” use following
formula:
Where:
a
= a numeral (usually a decimal number)
on the bearing housing is either added
to or subtracted from “10.5”.
b
= drive pinion gear to driven pinion gear
center distance (considered constant
“55”).
c
= a numeral (usually a decimal number)
on the right crankcase specifies a
thickness of “66”.
Middle drive pinion gear shim thickness:
“A” =
c
–
a
–
b