Arctic Cat 300 Utility Service Manual page 105

Correcting Tooth Contact

NOTE: If tooth contact pattern is comparable to the
correct pattern illustration, no correction is neces-
sary.
If tooth contact pattern is comparable to an incorrect pat-
tern, correct tooth contact according to the following
chart.
Tooth Contact
Contacts at Top
Contacts at Root
After tooth contact is corrected, gear backlash must be
checked.
Checking Backlash
1. Mount a dial indicator through the oil fill plug to
contact a tooth on the ring gear; then "zero" the dial
indicator.
2. While locking the pinion shaft to prevent it from
turning, rock the ring gear back and forth and record
the measurement. Standard backlash should be 0.05-
0.25 mm (0.002-0.010 in.). Maximum service limit
is 0.4 mm (0.016 in.).
3. Remove the dial indicator and rotate the ring gear
120°; then repeat steps 1-2.
4. Repeat step 3 for a total of three measurements; then
compare the difference between the three. Maximum
allowable difference is 0.2 mm (0.08 in.).

NOTE: If the difference in measurements exceeds
specifications, the bearings are not installed squarely
or the gear case is warped. If backlash is not within
specifications, correct using the following chart.
102
ATV-0104
Shim Correction
Decrease Shim Thickness
Increase Shim Thickness
KM936
Backlash Ring Gear Left Side
Insufficient Decrease Shim
Excessive Increase Shim

NOTE: Always change both shims by the same
amount on opposite sides. If left shim is increased,
right shim must be decreased by the same amount.
5. After backlash is corrected, recheck gear tooth con-
tact. Repeat Correcting Tooth Contact and Checking
Backlash until both are within specifications.
6. When tooth contact and backlash are within specifi-
cation, remove the cap screws securing the cover to
the gear case.
7. Clean any oil from the mating surfaces; then apply
an even coat of silicone sealant to the mating sur-
faces and install the gear case covers.
8. Install six 8 mm and two 10 mm cap screws and
while rotating the pinion gear, tighten in a crisscross
pattern to the specified torque (8 mm cap screws to
19 ft-lb, 10 mm cap screws to 36 ft-lb).
REPLACING SWING ARM SEALS
AND BEARINGS
To replace damaged or worn seals and bearings in the
swing arm assembly, use the following procedure.
1. Remove the dust seals from the swing arm pivot;
then using a slide hammer and bearing puller,
remove the pivot bearings.
2. Drive in new pivot bearings until fully seated; then
install new dust seals.
Ring Gear Right Side
Increase Shim
Decrease Shim
KM521
KM522