Installing The Middle Drive Shaft; Measuring The Middle Gear Backlash - Yamaha YFM4FAR Service Manual

MIDDLE GEAR
Install each bearings 1 onto the yoke.
G
CAUTION:
Check each bearing. The needles can
easily fall out of their races. Slide the yoke
back and forth on the bearings; the yoke
will not go all the way onto a bearing if a
needle is out of place.
G
Press each bearing into the U-joint using a
suitable socket.
NOTE:
The bearing must be inserted far enough into
the U-joint so that the circlip can be installed.
Install the circlips 2 into the groove of each
G
bearing.
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INSTALLING THE MIDDLE DRIVE SHAFT

1.Tighten:
Nut (middle drive pinion gear) 1
G
NOTE:
Secure the middle drive shaft in a vise with a
clean rag.
2.Lock the threads with a drift punch.
MEASURING THE MIDDLE GEAR
BACKLASH
1.Measure:
Gear lash
G
Middle gear lash:
0.1 ~ 0.3 mm (0.004 ~ 0.012 in)
*****************************************************
Measurement steps:
G
Temporarily install the left crankcase.
Attach the pinion gear fix clamp 2 to the
G
middle drive shaft.
Pinion gear fix clamp:
P/N. YM-04129, 90890-04129
4 - 86
ENG
New
130 Nm (13.0 m • kg, 94 ft • lb)