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4st 25/30 2022
32) Bevel Gear B Height Measurement
and Shim Selection
1. When measuring the backlash of each gear, first measure
the height of the bevel gear B of the drive shaft, then
adjust the value accordingly.
Following “Assembly of Bevel Gear B 1 to 3” and
“Installation of Pump Case 1 to 3” in Chapter 6, install the
parts up to the pump case (lower) 1.
2. To make it easy to adjust the shim, face the opening of the
gear case on the propeller shaft side upward and fix the
case horizontally with a holder.
Insert a shimming gauge
2
into the gear case, and
measure the gap a between the shimming gauge and the
bevel gear B
3
.
•
The shimming gauge
2
should contact the
taper surface of the outer race
4
of the
taper roller bearing.
•
Pull up the drive shaft to eliminate the
backlash during measurement.
Shimming Gauge
2
:
P/N. 346-72250-0
Thickness Gauge:
P/N. 353-72251-1
Measure the gap between the shimming gauge
2 and the edge of the bevel gear B with a
thickness gauge.
Remove the bevel gear assy A.
When the gear case, drive shaft, or oil seal
housing assy is replaced, measure the
height of bevel gear B and the backlash
between the gears and adjust the shim.
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