14-86
b. REVERSE BEVEL GEAR BACKLASH
1) Turn the vertical shaft five to ten turns clockwise for snug
seat of the bevel gear taper roller bearing.
2) Using the wrench, turn the shift rod in the direction shown
with the arrow and fix the propeller shaft.
If it is hard to fix the propeller shaft, turn the propeller shaft
to change the phase of the shaft and fix it.
NOTICE
3) Attach the special tool to the vertical shaft as shown, and
adjust the dial indicator so its needle is at the line “2” of the
special tool (backlash indicator tool).
TOOLS:
Backlash indicator tool
07SPJ-ZW0030Z
Backlash indicator attachment
07SPK-ZW10100
4) Turn the vertical shaft lightly right and left and record the
dial indicator reading.
Measure the backlash at the four points (by turning the
vertical shaft 90˚) in the same manner.
Do not turn the propeller shaft when turning the vertical
shaft.
5) Obtain the reverse bevel gear backlash using the dial
indicator runout and the following formula.
Formula:
Dial indicator runout ÷ 0.86 = Backlash
Example:
When dial indicator runout is 0.195 mm (0.0077 in):
0.195 ÷ 0.86 = 0.23
Therefore, the backlash is 0.23 mm (0.009 in).
NOTICE
[1]
BACKLASH
INDICATOR
ATTACHMENT
07SPK-ZW10100
[2]
BACKLASH
INDICATOR TOOL
07SPJ-ZW0030Z
[3]
DIAL INDICATOR
Adjust the dial indicator needle at
line “2” of the backlash indicator
tool.
90˚
90˚
90˚
[4]
VERTICAL
SHAFT
90˚
Standard value
0.10 – 0.35 mm
(0.004 – 0.014 in)
6) If the backlash is too large, increase the reverse bevel gear
shim thickness and recheck the backlash.
If the backlash is too small, reduce the reverse bevel gear
shim thickness and recheck the backlash.
Use the special tool when 50 x 90 x 20 mm radial ball
bearing is removed to adjust the backlash again (P. 14-69).
7) Adjust the thrust clearance after replacement of the
forward bevel gear shim (P. 14-87).
NOTICE
