4-8 SHAFT DRIVE
1 INCORRECT (Contact at tooth top)
2 CORRECT
3 INCORRECT (Contact at tooth root)
TOOTH CONTACT
After bringing the backlash within specification by changing the
secondary driven bevel gear shims, it will be necessary to check
tooth contact.
• Remove the drive bevel gear assembly from the crankcase.
• Clean and degrease the secondary drive bevel gear teeth, and
apply a coating of machinist’s layout dye or paste to several
teeth.
• Reinstall the secondary drive bevel gear assembly, with cor-
rect shim, onto the secondary gear housing.
• Rotate the secondary driven bevel gear several turns in both
directions.
• Remove the secondary drive bevel gear from the crankcase,
and observe the tooth contact pattern made in the dye or paste.
• Compare the tooth contact pattern to the examples as shown
in 1, 2 and 3.
• If tooth contact is found to be incorrect, the shims of the sec-
ondary drive bevel gear and secondary driven bevel gear must
be changed, tooth contact should be re-checked until correct.
$
After the tooth contact adjustment is made, the back-
lash must be re-checked, as it may change. Refer to the
backlash checking sub-section, and readjust until both
backlash and tooth contact are correct.
Tooth contact Shim adjustment
Contact at tooth top 1
Decrease thickness of shims
4 or 5
Contact at tooth root 3
Increase thickness of shims
4 or 5
SHIM SPECIFICATIONS
Drive bevel gear side
Part No. Shim thickness
24935-38A01-030 0.30 mm (0.012 in)
24935-38A01-035 0.35 mm (0.014 in)
24935-38A01-040 0.40 mm (0.016 in)
24935-38A01-050 0.50 mm (0.020 in)
24935-38A01-060 0.60 mm (0.024 in)
NOTE:
The shims (drive bevel gear side) are available as a set (24935-
38810).
Driven bevel gear side
Part No. Shim thickness
24945-05A00-0A0 0.30 mm (0.012 in)
24945-05A00-0B0 0.35 mm (0.014 in)
24945-05A00-0C0 0.40 mm (0.016 in)
24945-05A00-0D0 0.50 mm (0.020 in)
24945-05A00-0E0 0.60 mm (0.024 in)
NOTE:
The shims (driven bevel gear side) are available as a set (24945-
35810).
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