Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 434
6MT-73
Main Shaft Assembly
MANUAL TRANSMISSION AND DIFFERENTIAL
11) Install the 5th bushing.
(1) With the main shaft oil hole and 5th bushing
oil hole out of alignment, attach to the main
shaft.
(2) Using the ST, push into the 5th bushing.
ST1 18651AA000
INSTALLER
ST2 398177700
INSTALLER
CAUTION:
Do not apply pressure in excess of 40 kN (4.0
ton, 4.4 US ton, 3.9 Imp ton).
12) Make sure that the 4th drive gear can be turned
smoothly by hand. If it does not turn smoothly, re-
assemble.
13) Apply adequate transmission gear oil to the
main shaft, 5th needle bearing and 5th drive gear
inner surface.
14) Install the 5th needle bearing and 5th drive
gear.
15) Install the 5th baulk ring.
16) Install the 5th-6th hub.
(1) Being careful of the install direction of the
5th-6th hub, set to the main shaft.
(A) 5th bushing
(B) Main shaft oil hole
(C) Main shaft
(D) 5th bushing oil hole
(E) 4th drive gear
MT-01821
(A)
A
(D)
(C)
(E)
(B)
A
(D)
(A)
A - A
(B)
MT-00567
ST1
ST2
(A) 5th needle bearing
(B) 5th drive gear
(A) Main shaft
(B) 5th-6th hub
(C) 5th drive gear
MT-00568
(A)
(B)
MT-00569
MT-00570
(A)
(B)
(C)
6MT-74
Main Shaft Assembly
MANUAL TRANSMISSION AND DIFFERENTIAL
(2) Using the ST, push into the 5th-6th hub.
ST1 18651AA000
INSTALLER
ST2 398177700
INSTALLER
CAUTION:
Do not apply pressure in excess of 40 kN (4.0
ton, 4.4 US ton, 3.9 Imp ton).
NOTE:
When pushing into the 5th-6th hub, move the outer
baulk ring to match the protrusion of the outer baulk
ring and the cut out on the 5th-6th bushing.
17) Make sure that the 5th drive gear can be turned
smoothly by hand. If it does not turn smoothly, re-
assemble.
18) Attach the 5th-6th shifting insert key at the ap-
propriate position of the 5th-6th sleeve.
NOTE:
• The location angle of each shifting insert key is
120°.
• Refer to the following figure to install the shifting
insert key.
19) Attach the 5th-6th sleeve to the 5th-6th hub.
NOTE:
• There are two identification grooves on the 5th-
6th sleeve.
• Place the grooves towards the 5th drive gear,
and attach the 5th-6th sleeve.
(A) 5th-6th hub
(B) Outer baulk ring
(C) Cut out on the 5th-6th hub
(D) Protrusion of the outer baulk ring
MT-00571
(D)
(C)
(B)
(A)
(A)
ST1
ST2
(A) Attach the straight part of the shifting insert key
to the sleeve convex portion.
(B) 5th-6th shifting insert key
(C) 5th-6th sleeve
(A) 5th drive gear
(B) 5th-6th sleeve identification groove (2)
(B)
(C)
MT-01820
(A)
(B)
(A)
MT-00572
(A)
(B)
6MT-75
Main Shaft Assembly
MANUAL TRANSMISSION AND DIFFERENTIAL
20) Install the 6th baulk ring.
21) Apply adequate transmission gear oil to the
main shaft, 6th needle bearing and 6th drive gear
inner surface.
22) Install the 6th drive gear.
23) Install the 6th needle bearing.
24) With 6th bushing oil hole and the main shaft oil
hole out of alignment, attach to the main shaft.
25) Using the ST, install the 6th bushing.
ST1 18651AA000
INSTALLER
ST2 398177700
INSTALLER
CAUTION:
Do not apply pressure in excess of 40 kN (4.0
ton, 4.4 US ton, 3.9 Imp ton).
26) Make sure that the 6th drive gear can be turned
smoothly by hand. If it does not turn smoothly, re-
assemble.
27) Using the ST, install the inner bearing of the
double taper roller bearing.
ST1 18651AA000
INSTALLER
ST2 398177700
INSTALLER
CAUTION:
Do not apply pressure in excess of 40 kN (4.0
ton, 4.4 US ton, 3.9 Imp ton).
NOTE:
Use a new double taper roller bearing.
(A) 6th bushing oil hole
(B) Main shaft oil hole
MT-00573
MT-00574
MT-00575
MT-01933
(B)
(A)
MT-00577
ST1
ST2
MT-00578
ST1
ST2
6MT-76
Main Shaft Assembly
MANUAL TRANSMISSION AND DIFFERENTIAL
28) Using the ST, install the outer race and the out-
er bearing of the double taper roller bearing.
ST1 18651AA000
INSTALLER
ST2 398177700
INSTALLER
CAUTION:
Do not apply pressure in excess of 40 kN (4.0
ton, 4.4 US ton, 3.9 Imp ton).
NOTE:
• Confirm that the outer race is installed in the
proper direction.
• Push in until there is no backlash on the outer
race and the bearing turns smoothly by hand.
29) Make sure that the double taper roller bearing
turns smoothly by hand. If it does not turn smoothly,
replace the double taper roller bearing as a set, and
reassemble.
30) Attach a new lock washer and a new lock nut.
31) Set the main shaft assembly to the ST, and
tighten the lock nut.
ST1 18665AA000
HOLDER
ST2 18664AA000
BASE
NOTE:
Make sure the lock washer is installed in the proper
direction.
Tightening torque:
392 N·m (40.0 kgf-m, 289.1 ft-lb)
(A) Outer race
(B) Outer bearing of the double taper roller bearing
MT-00579
(B)
(A)
(A)
ST2
ST1
(A) Lock washer
(B) Lock nut
(C) Nut side
MT-02714
ST2
ST1
(B)
(A)
(C)
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