INFINITI QX4 2001 Factory Service Manual

SMT905C
3. Remove thrust needle bearing from press flange.
SMT906C
4. Remove seal ring from mainshaft.
IDo not reuse seal ring.
SMT907C
5. Set a drift (KV31103300), a support ring (KV40104710), a sup-
port ring (ST27863000) and a drift (ST35271000) to press
flange as shown in the figure. Press drift until snap ring is out
of place.
SMT908C
6. Remove snap ring from mainshaft.
IDo not reuse snap ring.
SMT909C
7. Remove washer.
DISASSEMBLY
Center Case (Cont'd)
TF-126

SMT910C
8. Remove press flange from mainshaft.
SMT911C
9. Remove return spring assembly from clutch hub.
SMT912C
10. Remove each plate from clutch drum.
SMT913C
11. Remove snap ring from mainshaft.
IDo not reuse snap ring.
SMT914C
12. Tap mainshaft with a plastic hammer to remove it from clutch
drum and clutch hub.
13. Remove needle bearing from mainshaft.
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DISASSEMBLY
Center Case (Cont'd)
TF-127

SMT915C
Clutch PistonNBTF0078S031. Remove oil pressure check plug from oil pressure check port.
SMT916C
2. Apply air gradually from oil pressure check port, and remove
clutch piston from center case.
SMT917C
3. Remove lip seal and D-ring from clutch piston.
IDo not reuse lip seal and D-ring.
4. Remove thrust needle bearing race from clutch piston by hook-
ing a screwdriver edge into 4 notches of thrust needle bearing
race.
Control ValveNBTF0078S04CAUTION:
IDo not reuse any part that has been dropped or damaged.
IMake sure valve is assembled in the proper direction.
IDo not use a magnet because residual magnetism stays
during disassembly.
SMT918C
1. Remove bolts, and detach oil strainer.
DISASSEMBLY
Center Case (Cont'd)
TF-128

SMT919C
2. Remove O-rings from oil strainer.
IDo not reuse O-rings.
SMT920C
3. Remove bolts for control valve.
SMT921C
4. Remove snap ring. Then push terminal assembly into center
case to remove control valve assembly.
SMT922CA
5. Remove lip seals from center case.
IDo not reuse lip seals.
IThere are two kinds of lip seals (lip seal of large inner
diameter: 5 pieces, lip seal of small inner diameter: 2
pieces). Confirm the position before disassembly.
SMT923C
6. Remove all bolts except for two.
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DISASSEMBLY
Center Case (Cont'd)
TF-129

SMT924C
7. Remove 4WD solenoid valve, clutch pressure switch, 2-4WD
shift solenoid valve, line pressure switch, and transfer fluid
temperature sensor from control valve assembly.
8. Remove O-rings from each solenoid valve, switch and termi-
nal body.
IDo not reuse O-rings.
SMT925C
9. Place control valve with lower body facing up, remove two
mounting bolts, and then remove lower body and separator
plate from upper body.
CAUTION:
IBe careful not to drop relief balls. Detach lower body care-
fully.
IDo not reuse separator plate.
SMT926C
10. Make sure reverse balls, relief balls and relief springs, accu-
mulator pistons, valve springs, and filters are securely installed
as shown in the figure, and remove them.
SMT927C
11. Remove retainer plates.
SMT928CA
12. Remove each control valve, spring and plug.
DISASSEMBLY
Center Case (Cont'd)
TF-130

SMT929C
Mainshaft Rear BearingNBTF0078S051. Remove mainshaft rear bearing from center case using a
remover (ST35291000) and a remover (ST30090010).
SMT930C
Main Oil PumpNBTF0078S061. Remove bolts as shown in figure to detach main oil pump.
SMT931C
2. Remove outer gear and inner gear.
SMT932C
Sub-oil PumpNBTF0078S071. Remove bolts to detach transfer motor from center case. Then
remove O-ring from the transfer motor.
IDo not reuse O-ring.
SMT933C
2. Remove sub-oil pump mounting bolts.
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DISASSEMBLY
Center Case (Cont'd)
TF-131

SMT934C
3. Thread two bolts (M4 x 0.8) into the holes of sub-oil pump as
shown in the figure, and pull out to remove sub-oil pump.
SMT935C
4. Remove oil pump gasket.
IDo not reuse gasket.
SMT936C
5. Remove sub-oil pump cover, outer gear, inner gear and O-ring
from sub-oil pump housing.
IDo not reuse O-ring.
SMT937C
Oil FilterNBTF0078S081. Remove bolts for oil filter.
SMT938C
2. Insert a screwdriver as shown in the figure to remove oil filter.
DISASSEMBLY
Center Case (Cont'd)
TF-132

SMT939C
3. Remove O-rings from oil filter.
IDo not reuse O-rings.
SMT940C
4. Remove oil filter stud.
SMT941C
5. Remove O-ring from oil filter stud.
IDo not reuse O-ring.
SMT895C
Front Case
DISASSEMBLYNBTF00791. Remove rear case from center case. Refer to TF-123.
2. Remove front case from center case.
SMT990C
Shift Rod ComponentsNBTF0079S011. Remove check plug, then check spring and check ball.
2. Remove wait detection switch.
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DISASSEMBLY
Center Case (Cont'd)
TF-133

SMT991C
3. Remove shift rod components together with 2-4 sleeve and
L-H sleeve.
SMT992C
4. Remove 2-4 sleeve and L-H sleeve from 2-4 fork and L-H fork
respectively.
SMT993C
5. Drive out roll pin from shift rod.
IDo not reuse roll pin.
SMT994C
6. Remove L-H fork, 2-4 fork, shift fork spring and fork guide from
shift rod.
SMT995C
Planetary Carrier, Sun Gear and Internal GearNBTF0079S021. Remove radial needle bearing from sun gear.
DISASSEMBLY
Front Case (Cont'd)
TF-134

SMT996C
2. Remove bolts to detach transfer cover.
IDo not reuse bolts.
SMT997C
3. Remove oil seal from transfer cover.
IDo not reuse oil seal.
SMT998C
4. Remove snap ring from main gear bearing.
IDo not reuse snap ring.
SMT999C
5. Remove sun gear by tapping it lightly.
SMT001D
6. Remove snap ring from sun gear.
IDo not reuse snap ring as it is a selective part.
7. Remove washer from sun gear.
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DISASSEMBLY
Front Case (Cont'd)
TF-135