Yamaha F50D Servise Manual - page 267
8-68
0
1
2
3
4
5
6
7
8
9
10
A
10. Slowly turn the drive shaft clockwise and
counterclockwise, and then measure the
backlash at the position where it stops in
each direction.
TIP:
Do not turn the drive shaft with excessive
force, otherwise the forward gear will rotate,
leading to incorrect measurements.
11. Turn the drive shaft 180° clockwise and
measure the backlash again.
TIP:
9
Measure the backlash at 4 points:
c
,
d
,
e
, and
f
, turning the drive shaft 180°
clockwise after each measurement. Note
the measurement data in the shimming
check sheet.
9
When turning the drive shaft, hold it with a
little force. A knocking sound may be heard
when the drive shaft is rotated, but this is
the sound of the pinion contacting the
reverse gear and does not affect the back-
lash measurement.
12. Determine the backlash average, and
then truncate it by dropping the numbers
after the 1/100 place without rounding.
Magnet base plate
7
: 90890-07003
Dial gauge set
8
: 90890-01252
Magnet base
9
: 90890-06844
Pinion height gauge set
0
: 90890-06669
7
0
6
9
8
Example:
(mm)
Measurement
point
c
0.30
0.29
0.30
Measurement
point
d
0.35
0.32
0.36
Measurement
point
e
0.31
0.34
0.34
Measurement
point
f
0.36
0.35
0.33
Average
0.3300
0.3250
0.3325
Truncated
average (BL1)
0.33
0.32
0.33
e
f
d
c
Shimming (FT50C)