Suzuki LT-Z250 Service Manual page 138

4-20 DRIVE TRAIN
TOOTH CONTACT
After backlash adjustment and left shim selection are carried
out, the tooth contact must be checked. Pay attention to the fol-
lowing procedures:
Remove the ring gear.
Clean and degrease several teeth on the ring gear and pinion
gear, and then apply a coating of machinist s layout dye or
paste to several teeth of the pinion gear.
Install the ring gear with the shims in place.
Install the final gear case cover, and then tighten the bolts to
the specified torque in a crisscross pattern. (!4-15)
% Final gear case cover bolt: 26 N•m (2.6 kgf-m, 19.0 lb-ft)
NOTE:
At this time, it is not necessary to install the gear case cover s O-
ring.
Rotate the gear several turns in each direction. This will pro-
vide a contact pattern on the coated teeth of the gear.
Remove the ring gear and compare the coated teeth to the
examples shown in 1, 2 and 3.
If tooth contact is found to be correct (example 2), go to
the FINAL ASSEMBLY sub-section on page 4-13 to -15 to
complete installation.
If tooth contact is found to be incorrect (examples 1 and 3),
the shim between the pinion gear bearing and gear case must
be changed and the tooth contact re-checked until correct.
Tooth contact
Contact at tooth top 1
Contact at tooth root 3
#
Make sure to check the backlash and shim thickness
after the tooth contact has been adjusted, since it may
have changed. Adjust the tooth contact and backlash
until they are both within specification. If the correct
tooth contact cannot be maintained when adjusting
the backlash, replace the pinion gear and ring gear as
a set.
Shim adjustment
Decrease shim thickness
Increase shim thickness
Incorrect
(Contact at tooth top)
Correct
Incorrect
(Contact at tooth root)
:
For pinion gear ( 4-21)
Shim thickness
Part No.
1.38 mm (0.0543 in)
1.44 mm (0.0567 in)
27407-05810
1.50 mm (0.0591 in)
(Shim set: 6 pcs)
1.56 mm (0.0614 in)
1.62 mm (0.0638 in)
1.68 mm (0.0661 in)