4-18 SHAFT DRIVE
TOOTH CONTACT
After backlash adjustment is carried out, the tooth contact must
be checked.
• Remove the bolts from the final gear bearing case, and remove
the case with the two 5 mm screws. ("4-14) Do not mis-
place the shims. Remove the final driven bevel gear.
• Clean and de-grease several teeth on the final driven bevel
gear. Coat these teeth with machinist’s dye or paste, preferably
of a light color.
• Re-install the final driven bevel gear with shims in place, posi-
tioning the coated teeth so that they are centered on the final
drive bevel gear.
• Re-install the final gear bearing case and bolts, and tighten to
specification.
! Final gear case bolt: 23 N
.
m (2.3 kgf
.
m, 16.5 lb-ft)
• Using a socket and handle on the final drive bevel gear cou-
pling nut, rotate the final drive bevel gear several turns in each
direction, while loading the final driven bevel gear. This will pro-
vide a contact pattern on the coated teeth of the driven bevel
gear.
• Remove the final gear bearing case and final driven bevel gear,
and inspect the coated teeth of the driven bevel gear. The con-
tact patch should be as shown at right:
• If the tooth contact pattern is incorrect, as shown in 1, a thin-
ner shim 4 is needed between the final drive bevel gear bear-
ing and final gear case.
• If the tooth contact pattern is incorrect, as shown in 3, a thicker
shim 4 is needed between the final drive bevel gear bearing
and final gear case.
• If the tooth contact pattern is incorrect for either reason, the
appropriate shim must be installed an the tooth contact pat-
tern rechecked by repeating the tooth coating procedure above.
NOTE:
If it is necessary to adjust the shim
4
thickness between final
drive bevel gear bearing and final gear case, the final gear back-
lash may change, and should be re-checked according to the
procedure outlined under the Backlash Measurement sub-sec-
tion. Both adjustments may be needed until both backlash and
tooth contact are correct.
1 INCORRECT (Contact at tooth top)
2 CORRECT
3 INCORRECT (Contact at tooth root)
Shims 4 specification
Part No. Shim thickness
27445-38A00-030 0.30 mm (0.012 in)
27445-38A00-035 0.35 mm (0.014 in)
27445-38A00-040 0.40 mm (0.016 in)
27445-38A00-050 0.50 mm (0.020 in)
27445-38A00-060 0.60 mm (0.024 in)
The shims 4 are available as a set
(27445-38810).
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