ECU INFINITI QX4 2001 Factory Service Manual

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

SMT011D
Front Case
ASSEMBLYNBTF0082Planetary Carrier, Sun Gear and Internal GearNBTF0082S011. Apply ATF to oil seal periphery, and install oil seal so that it is
flush with the end face of front case.
IDo not reuse oil seal.
SMT012D
2. Install internal gear with its groove facing snap ring into front
case. Then secure it with snap ring.
IDo not reuse snap ring.
SMT108D
3. Remove all the liquid gasket on plug bolt and front case. Apply
locking sealant to plug bolt, install it to front case and tighten
it to specified torque.
IWith one crest of plug bolt inserted in the hole, apply liquid
gasket 1215 to the thread.
: 19 - 25 N´m (1.9 - 2.5 kg-m, 14 - 18 ft-lb)
SMT014D
4. Install snap ring to main gear bearing.
IDo not reuse snap rings.
SMT015D
5. Set main gear bearing to front case, then press it.
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ASSEMBLY
Front Case
TF-141

SMT995C
20. Apply petroleum jelly to radial needle bearing, and install it
inside sun gear.
21. Install shift rod assembly to front case assembly. Refer to ªShift
Rod Assemblyº, TF-144.
22. Install center case assembly to front case assembly. Refer to
ªFinal Assemblyº, TF-153.
23. Install rear case assembly to center case. Refer to ªFinal
Assemblyº, TF-153.
SMT994C
Shift Rod AssemblyNBTF0082S021. Install fork guide, shift fork spring, 2-4 fork, and L-H fork to shift
rod, and secure them with roll pins.
IDo not reuse roll pins.
SMT992C
2. Install 2-4 sleeve and L-H sleeve to each fork.
SMT991C
3. While aligning L-H sleeve with planetary carrier, install shift rod
assembly to front case.
SMT990C
4. Remove all the liquid gasket on check plug and front case, and
install check ball and check spring to front case. Apply gasket
fluid 1215 (Three Bond) to check plug, install it to front case,
and tighten it to specified torque.
IWith plug bolt threaded one pitch into the hole, apply gasket
fluid 1215 (Three Bond) to the thread.
: 19 - 25 N´m (1.9 - 2.5 kg-m, 14 - 18 ft-lb)
5. Remove all the liquid gasket on the switch fitting and inner side
of front case, and with wait detection switch threaded one pitch
into the hole, apply gasket fluid 1215 (Three Bond) to the
thread, install it, and tighten it to specified torque.
ASSEMBLY
Front Case (Cont'd)
TF-144

SMT911D
9. Install bolts as shown in the figure, and tighten them to speci-
fied torque.
Bolt symbol a b *c d e f
Length under head
mm (in)38
(1.50)43.5
(1.713)62
(2.44)19
(0.75)52
(2.05)47
(1.85)
Q'ty 1732111
Tightening torque
N´m (kg-m, in-lb)6.9 - 8.8 (0.70 - 0.90, 61.1 - 77.9)
*: Tighten with oil strainer.
SMT920C
10. Install control valve assembly to center case, and tighten bolts.
: 6.9 - 8.8 N´m (0.70 - 0.90 kg-m, 61.1 - 77.9 in-lb)
SMT921C
11. Secure terminal body with snap ring.
SMT919C
12. Apply ATF or petroleum jelly to O-rings, and install them to oil
strainer.
CAUTION:
Do not reuse snap ring.
13. Install oil strainer to control valve assembly.
14. Install mainshaft and clutch drum to center case. Refer to
ªMainshaft and Clutch Drumº, TF-149.
15. Install front case assembly and rear case assembly. Refer to
ªFinal Assemblyº, TF-153.
SMT917C
Clutch PistonNBTF0083S051. Apply ATF to D-ring and lip seal, and install them to clutch pis-
ton.
ASSEMBLY
Center Case (Cont'd)
TF-148

SMT974C
5. Install clutch drum, needle bearing and clutch hub to
mainshaft, and secure them with snap ring.
IDo not reuse snap ring.
SMT975C
6. Install each clutch to clutch drum.
SMT911C
7. Align the notch of return spring assembly with the pin of clutch
hub, and install it.
SMT977C
8. Install press flange (with the holes indicated by arrows aligned
with pins of clutch hub).
SMT909C
9. Install washer.
ASSEMBLY
Center Case (Cont'd)
TF-150

SMT989C
5. Align claw of oil gutter with center case, and install it.
6. Install front case assembly and rear case assembly.
Refer to ªFinal Assemblyº, TF-153.
SMT891C
Final AssemblyNBTF00841. Install C-rings to mainshaft rear bearing.
SMT889C
2. Check speedometer drive gear teeth for abnormal wear. Set
speedometer drive gear properly on mainshaft, and secure it
with snap ring.
IDo not reuse snap ring.
SMT893C
3. Apply sealing fluid 518 (Locktite) to the entire center case
mounting surface of front case as shown in the figure.
CAUTION:
Remove all foreign materials such as water, oil and grease
from center case and front case mating surfaces.
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ASSEMBLY
Center Case (Cont'd)
TF-153

SMT894C
4. Make sure the two claws of oil gutter are securely attached to
slots in center case.
SMT895C
5. With the claws of oil gutter held by a finger, install center case
assembly to front case assembly.
CAUTION:
Pay careful attention so that mainshaft end does not damage
radial needle bearing in sun gear assembly.
6. Tap center case lightly with a rubber hammer or the like and
press-fit front drive shaft bearing into front case.
SMT896C
7. Make sure oil gutter rear end protrudes from point ªAº in the
figure.
8. Tighten bolts to specified torque.
: 41 - 48 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
IBe sure to install air breather hose clamp, connector
bracket and harness clip.
SMT883C
9. Fit double-flat end of oil pump shaft into slot of main oil pump
and install it.
NOTE:
When oil pump shaft is rotated slightly, it drops into position where
both parts fit.
SMT884C
10. Install stem bleeder to center case.
ASSEMBLY
Final Assembly (Cont'd)
TF-154