2004 INFINITI QX56 Ins

TF-142
CENTER CASE
Revision: August 20072004 QX56
CONTROL VALVE
1. Clean upper body, control valves and springs with cleaning agent, and dry with compressed air.
2. Dip control valves in ATF, and apply ATF to the valve-mounting area of upper body.
3. Install each control valve (3), spring (4) and plug (2) to upper
body (5), and install retainer plates (1) to hold them in place.
CAUTION:

To insert control valves into upper body, place upper
body on a level surface in order to prevent flaw or dam-
age.

Make sure each control valve is smoothly inserted.
4. Install reverse balls, relief balls and relief springs, accumulator
pistons and valve springs to upper body.
5. Install lower body and separator plate to upper body.
NOTE:
Do not reuse separator plates.
WDIA0284E
SDIA2127E
SDIA2126E
SDIA2125E

CENTER CASE
TF-143
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: August 20072004 QX56
6. With lower body down, tighten two bolts in the position shown.
7. Apply ATF or petroleum jelly to new O-ring, and install it to 2-
4WD shift solenoid valve, line pressure switch and 4WD sole-
noid valve. Install them to control valve assembly.
NOTE:
Do not reuse O-rings.
8. Apply ATF or petroleum jelly to lip seals, and install them to cen-
ter case.
CAUTION:
There are 2 kinds of lip seals (lip seal of large inner diame-
ter: 5 pieces, lip seal of small inner diameter: 2 pieces).
Confirm their position for installation.
NOTE:
Do not reuse lip seals.
9. Install the other 13 bolts and tighten them to specified torque.
10. Install control valve assembly to center case, and tighten bolts.
11. Install connector assembly into center case installation hole, and
secure terminal body with snap ring.
SDIA2124E
SDIA2123E
Control valve case bolts : 7.9 N·m (0.81 mm, 70 in-lb)
SDIA2100E
Control valve bolts : 7.9 N·m (0.81 kg-m, 70 in-lb)
SDIA2121E
SDIA2122E

TF-144
CENTER CASE
Revision: August 20072004 QX56
12. Apply ATF or petroleum jelly to new O-rings, and install them on
oil strainer.
NOTE:
Do not reuse O-rings.
13. Install oil strainer to control valve assembly.
CLUTCH PISTON
1. Apply ATF or petroleum jelly to new D-rings, and install them to
clutch piston.
NOTE:
Do not reuse D-rings.
2. Install thrust needle bearing race to clutch piston.
3. Install clutch piston to the center case as shown.
CAUTION:
Install so the fitting protrusion of the clutch piston with
aligns the dent of the center case.
SDIA2120E
SDIA2 117 E
SDIA2189E
SDIA2190E

CENTER CASE
TF-145
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: August 20072004 QX56
4. Remove all the liquid gasket from oil pressure check port and
inside center case. With the new oil pressure check plug
threaded in 1 or 2 pitches, apply specified sealant or equivalent,
to the oil pressure check plug thread of plug, and tighten. Refer
to GI-45, "
Recommended Chemical Products and Sealants" .
NOTE:
Do not reuse oil pressure check plug.
5. Install mainshaft and clutch drum. Refer to TF-145, "
MAIN-
SHAFT AND CLUTCH DRUM" .
MAINSHAFT AND CLUTCH DRUM
1. Apply ATF or petroleum jelly to needle bearing, and install nee-
dle bearing, clutch drum, clutch hub and new snap ring to main-
shaft.
2. Install new snap ring to the clutch hub, using suitable tool.
NOTE:
Do not reuse snap ring.
3. Install new snap ring to clutch hub from clutch hub to mainshaft,
and secure them with snap rings.
NOTE:
Do not reuse snap rings.Oil pressure check plug : 15 N·m (1.5 kg-m, 11 in-lb)
SMT915C
SMT974C
WDIA0101E
SDIA2192E

TF-146
CENTER CASE
Revision: August 20072004 QX56
4. Install each plate into clutch drum as shown.
5. Install the return spring assembly into clutch hub.
6. Install press flange by aligning notches to the clutch hub as
shown.
7. Install the snap ring to the main shaft snap ring groove on main-
shaft, using Tool.
NOTE:
Do not reuse snap ring.
8. Install new snap rings to mainshaft.
NOTE:
Do not reuse snap ring.
SDIA2193E
SM T9 11 C
SDIA2194E
Tool number
A : ST22452000 (J-34335)
B : ST30911000 ( — )
C : KV31103300 ( — )
SD I A 2 111E
SDIA2 112 E

CENTER CASE
TF-147
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: August 20072004 QX56
9. Apply ATF or petroleum jelly to thrust needle bearing and install
it on press flange.
10. Install the new snap ring to main shaft.
NOTE:
Do not reuse snap ring.
11. Install mainshaft rear bearing to center case, using Tool.
12. Install mainshaft assembly, and set it to press stand.

Place to the tip of mainshaft, and press mainshaft into center
case, using Tool.
13. Install front drive shaft and drive chain. Refer to TF-148, "
FRONT DRIVE SHAFT AND DRIVE CHAIN" .
14. Install front case assembly and rear case assembly.
Refer to TF-149, "
Final Assembly" .
SDIA2109E
SDIA2195E
Tool number : ST1531000 (J-25640-B)
SDIA2196E
To o l n u m b e r
A : ST30911000 ( — )
B : ST33052000 ( — )
SDIA2197E

TF-148
CENTER CASE
Revision: August 20072004 QX56
FRONT DRIVE SHAFT AND DRIVE CHAIN
1. Install front drive shaft rear bearing, using Tool.
a. Install front drive shaft to front bearing, using Tool.
2. Install drive chain temporarily to front drive shaft and clutch
drum.
CAUTION:
Install drive chain by aligning identification marks to the
rear as shown.
3. Tap front drive shaft while keeping it upright and press-fit front
drive shaft rear bearing, using suitable tool.
CAUTION:
Be careful not to tap drive chain with tool.
4. Install front case assembly and rear case assembly. Refer to TF-149, "
Final Assembly" . Tool number
A : KV40100621 (J-25273)
B : ST30032000 (J-26010-01)
SDIA2198E
Tool number
A : KV40100621 (J-25273)
B : ST30032000 (J-26010-01)
SDIA2199E
SDIA2200E
SMT988C

ASSEMBLY
TF-149
C
E
F
G
H
I
J
K
L
MA
B
TF
Revision: August 20072004 QX56
ASSEMBLYPFP:00030
Final AssemblyEDS00195
1. Install C-rings to mainshaft.
2. Set washer holder on mainshaft, and secure it with new snap
ring.
NOTE:
Do not reuse snap ring.
3. Apply specified Anaerobic Liquid Gasket or equivalent to the
entire center case mounting surface of front case assembly as
shown. Refer to GI-45, "
Recommended Chemical Products and
Sealants" .
NOTE:
Remove all foreign materials such as water, oil and grease from
center case and front case mating surfaces.
SDIA2201E
SDIA2104E
SDIA2202E