Checking The Pinion Gear; Middle Drive And Driven Gear Shim Selection - Yamaha YFM660FP Service Manual

MIDDLE GEAR

CHECKING THE PINION GEAR

1.Check
Gear teeth (drive pinion gear) 1
●
Gear teeth (driven pinion gear) 2
●
Pitting/galling/wear → Replace.
2.Check
O-ring
●
Damage → Replace.
Bearings
●
Pitting/damage → Replace.
3.Check:
U-joint movement
●
Roughness → Replace U-joint.
MIDDLE DRIVE AND DRIVEN GEAR SHIM
SELECTION
When the drive and driven gear, bearing hous-
ing assembly and/or crankcase replaced, be
sure to adjust the gear shim 1 and 2.
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
marked on crankcase, bearing housing and
drive gear end.
1 Shim thickness "A"
2 Shim thickness "B"
●
To find shim thickness "A" use following for-
mula:
Middle drive pinion gear shim thickness:
"A" = a + d – b – c
4 - 91
ENG
from information