KYMCO 2006 MXU 500 Off-Road Owner's Manual page 500

13
. DRIVE TRAIN
TOOTH CONTACT
After backlash adjustment and right side
shim selection are carried out, the tooth
contact must be checked. Pay attention to
the following points:
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 gear case cover, and then
tighten the bolts to the specified torque in
a crisscross pattern in 2 or 3 steps.
＊
Do not apply a sealant to the mating
surface of the gear case.
Do not apply a sealant to the case
bolts.
It is important to turn the pinion while
tightening the bolts. If the ring gear
shim is too thick, the gears will lock
after only light tightening
At this time, it is not necessary to
install the gear case cover's O-ring.
Torque:
10-mm bolt: 5 kgf-m (49 N-m, 36 lbf-ft)
8-mm bolt: 2.5 kgf-m (25 N-m, 19 lbf-ft)
Rotate the ring gear several turns in each
direction. This will provide a contact
pattern on the coated teeth of ring 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 "REAR DRIVE
DISASSEMBLY/INSPECTION/
ASSEMBLY" section in this chapter) to
complete installation.
If tooth contact is found to be incorrect
(example (1) and (3)), the shim between the
pinion gear bearing and pinion gear must be
changed and tooth contact re-checked until
correct.
(1)
Incorrect: Contact at tooth top
(2)
Correct
(3)
Incorrect: Contact at tooth root
Tooth contact
Contact at tooth top (1)
Contact at tooth root (3)
MXU 500
Shim adjustment
Decrease shim
thickness
Increase shim
thickness
13-54