74
1. Place the left-side crankcase cover onto the left-side
crankcase half to prevent runout of the secondary
transmission output shaft.
2. Install the secondary driven output shaft assembly
onto the crankcase.
3. Mount the indicator tip of the dial indicator on the
secondary driven bevel gear (centered on the gear
tooth).
4. While rocking the driven bevel gear back and forth,
note the maximum backlash reading on the gauge.
5. Acceptable backlash range is 0.05-0.33 mm (0.002-
0.013 in.).
Correcting Backlash
NOTE: If backlash measurement is within the
acceptable range, no correction is necessary.
1. If backlash measurement is less than specified,
remove an existing shim, measure it, and install a
new thinner shim.
2. If backlash measurement is more than specified,
remove an existing shim, measure it, and install a
thicker shim.
NOTE: Continue to remove, measure, and install
until backlash measurement is within tolerance. Note
the following chart.
Checking Tooth Contact
NOTE: After correcting backlash of the secondary
driven bevel gear, it is necessary to check tooth con-
tact.
1. Remove the secondary driven output shaft assembly
from the left-side crankcase half.
2. Clean the secondary driven bevel gear teeth of old oil
and grease residue.
3. Apply a thin, even coat of a machinist-layout dye to
several teeth of the gear.
4. Install the secondary driven output shaft assembly.
5. Rotate the secondary driven bevel gear several revo-
lutions in both directions.
6. Examine the tooth contact pattern in the dye and
compare the pattern to the illustrations.
ATV-0103
ATV-0105
ATV-0104
Correcting Tooth Contact
NOTE: If tooth contact pattern is comparable to the
correct pattern illustration, no correction is necessary.
If tooth contact pattern is comparable to an incorrect pat-
tern, correct tooth contact according to the following
chart.
NOTE: To correct tooth contact, steps 1 and 2 (with
NOTE) of “Correcting Backlash” must be followed
and the above “Tooth Contact/Shim Correction”
chart must be consulted.
Backlash Measurement
Shim Correction
Under 0.05 mm (0.002 in.)
Decrease Shim Thickness
At 0.05-0.33 mm (0.002-0.013 in.)
No Correction Required
Over 0.33 mm (0.013 in.)
Increase Shim Thickness
Tooth Contact
Shim Correction
Contacts at Top
Decrease Shim Thickness
Contacts at Root
Increase Shim Thickness
CAUTION
After correcting tooth contact, backlash must again be
checked and corrected (if necessary). Continue the cor-
recting backlash/correcting tooth contact procedures
until they are both within tolerance values.
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