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MT-76
MAINSHAFT AND GEARS
3. Measure the clearance “C” at 2 points or more diagonally oppo-
site using a feeler gauge when pressing baulk ring toward clutch
gear taper cone. And then calculate mean value.
Bearing
Check items below. If necessary, replace them with new ones.
Damage and rough rotation of bearing
ASSEMBLY
1. Press in reverse main gear using the drifts and the press stand.
CAUTION:
Be careful with orientation of reverse main gear.
Do not reuse reverse main gear.Clearance “C”
Standard value : 0.7 - 1.1 mm (0.028 - 0.043 in)
Limit value : 0.3 mm (0.012 in)
PCIB1361E
MTF0041D
SCIA0939E
SCIA0992E
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MAINSHAFT AND GEARS
MT-79
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12. Press in 4th main gear using the drifts.
CAUTION:
Be careful with orientation of 4th main gear.
Do not reuse 4th main gear.
13. Press in 5th main gear using the drifts.
CAUTION:
Be careful with orientation of 5th main gear.
Do not reuse 5th main gear.
14. Install snap ring onto mainshaft, and check that end play of 5th
main gear satisfies the standard value.
If measurement is outside the standard range, reselect snap
ring. Refer to MT-105, "
5TH MAIN GEAR" .
15. Press in mainshaft rear bearing using the drifts.
16. Install mainshaft C-ring onto mainshaft, and check that end play
of mainshaft rear bearing satisfies the standard value.
If measurement is outside the standard range, reselect main-
shaft C-ring. Refer to MT-105, "
MAINSHAFT C-RING" .
SCIA0945E
SCIA0946E
End play standard value : 0 - 0.1 mm (0 - 0.004 in)
SCIA0947E
SCIA0948E
End play standard value : 0 - 0.06 mm (0 - 0.0024 in)
SCIA0949E
Page 2236 of 4555
MT-80
MAINSHAFT AND GEARS
17. Install C-ring holder, and then install snap ring.
CAUTION:
Do not reuse snap ring.
18. Check end play of 1st and 2nd main gears.
Disassembly and Assembly (RS6F51A)ECS008C7
DISASSEMBLY
1. Before disassembling, measure the end play of 1st and 2nd
main gears.
2. Remove snap ring.
3. Remove C-ring holder, and then remove mainshaft C-ring.
PCIB0802E
End play standard value
1st main gear : 0.20 - 0.30 mm (0.0079 - 0.0118 in)
2nd main gear : 0.06 - 0.16 mm (0.0024 - 0.0063 in)
SCIA0933E
End play standard value
1st main gear : 0.20 - 0.30 mm (0.0079 - 0.0118 in)
2nd main gear : 0.06 - 0.16 mm (0.0024 - 0.0063 in)
SCIA0973E
PCIB0805E
Page 2237 of 4555
MAINSHAFT AND GEARS
MT-81
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4. Press out mainshaft rear bearing, 6th main adjusting shim and
6th main gear using the drift and a puller.
5. Remove 5th-6th mainshaft spacer.
6. Press out 4th main gear and 5th main gear using the drift and a
puller.
7. Remove 4th main gear adjusting shim.
8. Remove 3rd-4th mainshaft spacer.
9. Press out 3rd main gear, 2nd main gear, 2nd needle bearing,
2nd main gear bushing, 1st-2nd synchronizer hub assembly, 1st
main gear, 1st needle bearing, and 1st main gear bushing
reverse main gear using the drift.
INSPECTION AFTER DISASSEMBLY
Mainshaft and Gears
Check items below. If necessary, replace them with new ones.
Damage, peeling, dent, uneven wear, bending, and other non-
standard conditions of the shaft.
Excessive wear, damage, peeling, and other non-standard con-
ditions of the gears.
SCIA0976E
SCIA0937E
SCIA0938E
SCIA1076J
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MT-82
MAINSHAFT AND GEARS
Synchronizer
Check items below. If necessary, replace them with new ones.
Damage and unusual wear on contact surfaces of coupling
sleeve, synchronizer hub and shifting insert.
Coupling sleeve and synchronizer hub must move smoothly.
If any crack, damage, or excessive wear is found on cam face of
baulk ring or working face of insert, replace it.
BAULK RING CLEARANCE
Triple-cone synchronizer (1st and 2nd)
Check the clearance between outer baulk ring, synchronizer
cone and inner baulk ring as follows.
CAUTION:
The clearances “A”, “B” and “C” are controlled with outer
baulk ring, synchronizer cone and inner baulk ring as a set.
Replace them as a set if the clearances are outside the limit
value.
1. Measure the clearance “A” at 2 points or more diagonally oppo-
site using a feeler gauge when pressing baulk ring toward clutch
gear taper cone. And then calculate mean value.
SMT387A
SMT867D
PCIB1358E
Clearance “A”
Standard value : 0.6 - 1.2 mm (0.024 - 0.047 in)
Limit value : 0.3 mm (0.012 in)
PCIB1359E
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MT-83
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2. Measure the clearance “B” at 2 points or more diagonally oppo-
site using a feeler gauge. And then calculate mean value.
3. Measure the clearance “C” at 2 points or more diagonally oppo-
site using a feeler gauge when pressing baulk ring toward clutch
gear taper cone. And then calculate mean value.
Bearing
Check items below. If necessary, replace them with new ones.
Damage and rough rotation of bearing
ASSEMBLY
1. Press in reverse main gear using the drifts and the press stand.Clearance “B”
Standard value : 0.6 - 1.1 mm (0.024 - 0.043 in)
Limit value : 0.2 mm (0.008 in)
PCIB1360E
Clearance “C”
Standard value : 0.7 - 1.1 mm (0.028 - 0.043 in)
Limit value : 0.3 mm (0.012 in)
PCIB1361E
MTF0041D
SCIA0939E
Page 2243 of 4555

MAINSHAFT AND GEARS
MT-87
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16. Select 6th main adjusting shim and then install it onto mainshaft.
Calculate thickness “S” of 6th main adjusting shim following
the procedure below so that end play dimension between 6th
main gear and mainshaft rear bearing becomes the dimen-
sion shown below. Refer to MT-107, "
6TH MAIN GEAR
ADJUSTING SHIM" .
CAUTION:
Only one adjusting shim can be selected.
a. Using height gauge, measure dimension “S
1 ” and “S2 ”.
b. Install selected 6th main adjusting shim to mainshaft.
17. Press in mainshaft rear bearing using the drifts.
18. Install mainshaft C-ring onto mainshaft, and check that end play
of mainshaft rear bearing satisfies the standard value.
If measurement is outside the standard range, reselect main-
shaft C-ring. Refer to MT-105, "
MAINSHAFT C-RING" . End play: 0 - 0.1 mm (0 - 0.004 in)
Dimension“S” = (S
1 - S2 ) - End play
S: Thickness of adjusting shim
S
1 : Dimension from mainshaft standard face to
mainshaft rear bearing press-fit end face
S
2 : Dimension from mainshaft standard face to
6th main gear end face
SCIA0995E
SCIA0978E
End play standard value : 0 - 0.06 mm (0 - 0.0024 in)
SCIA0979E
Page 2244 of 4555
MT-88
MAINSHAFT AND GEARS
19. Install C-ring holder, and then install snap ring.
CAUTION:
Do not reuse snap ring.
20. Check end play of 1st and 2nd main gears.
PCIB0805E
End play standard value
1st main gear : 0.20 - 0.30 mm (0.0079 - 0.0118 in)
2nd main gear : 0.06 - 0.16 mm (0.0024 - 0.0063 in)
SCIA0973E