3-43
3
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 second-
ary driven bevel gear, it is necessary to check
tooth contact.
1. Remove the secondary driven output shaft assem-
bly 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
revolutions 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
pattern, correct tooth contact according to the follow-
ing chart.
NOTE: To correct tooth contact, steps 1 and 2
(with NOTE) of “Correcting Backlash” must be fol-
lowed and the above “Tooth Contact/Shim Correc-
tion” chart must be consulted.
OIL PUMP ASSEMBLY
Disassembling and Inspecting
1. Remove the oil pump cover; then remove the gero-
tor set, shaft, and pin (see Disassembling Crank-
case Half in this section).
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
correcting backlash/correcting tooth contact proce-
dures until they are both within tolerance values.
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