Yamaha F50D Servise Manual page 276

LOWR
TIP:
9
If the shim thickness adjustment value is
positive, the current shim thickness must be
increased by that amount and, if the value
is negative, the current shim thickness must
be decreased by that amount.
9
The gray zone on the selection chart indi-
cates the range of the specified backlash.
Shimming is not required if the measured
backlash is within the gray zone.
9 The values for the shim thickness adjust-
ments specified in the selection chart are
intended to achieve the median value within
the range for the specified forward or
reverse gear backlash.
9 The selection chart table shows the shim
thickness adjustments for marked points on
the chart.
4. Calculate the new forward gear shim
thickness (T1) as same way in the exam-
ples.
Calculation formula:
New forward gear shim thickness (T1) = Cur-
rent forward gear shim thickness + Shim
thickness adjustment
Example:
If the current forward gear shim thickness is
0.52 mm and the shim thickness adjustment
is 0.20 mm, then
(T1)= 0.52 mm + 0.20 mm
= 0.72 mm
If the current forward gear shim thickness is
0.52 mm and the shim thickness adjust-
ment is –0.17 mm, then
(T1)= 0.52 mm + (–0.17) mm
= 0.52 mm – 0.17 mm
= 0.35 mm
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
8-77
Lower unit
TIP:
9
Use the least number of shims to achieve
the required shim thickness.
9
If the calculated shim thickness cannot be
obtained with a combination of the available
shims, decrease the shim thickness by 0.01
mm.
5. Install the shim(s) (T1) and taper roller
bearing outer race.