Ins INFINITI QX56 2004 Factory Service Manual

CENTER CASE
TF-117
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Revision: August 20072004 QX56
5. Remove snap ring from mainshaft, using suitable tool.
6. Remove press flange from mainshaft.
7. Remove return spring assembly from clutch hub.
8. Remove each plate from clutch drum.
9. Remove snap ring from mainshaft.
SDIA2 112 E
SMT910C
SM T9 11 C
SMT912C
SDIA2 113 E

TF-118
CENTER CASE
Revision: August 20072004 QX56
10. Tap mainshaft, using suitable tool to remove it from clutch drum
and clutch hub.
11. Remove needle bearing and spacer from the mainshaft.
12. Remove the snap ring from the clutch hub.
CLUTCH PISTON
1. Remove oil pressure check plug from oil pressure check port.
2. Apply air gradually from oil pressure check port, and remove
clutch piston from center case.
SMT914C
WDIA0101E
SDIA2 115 E
SDIA2 116 E

CENTER CASE
TF-121
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Revision: August 20072004 QX56
8. Remove O-rings from each solenoid valve, switch and terminal body.
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:
Be careful not to drop relief balls. Detach lower body care-
fully.
10. Make sure reverse balls, relief balls and relief springs, accumu-
lator pistons and valve springs are securely installed as shown,
and remove them.
11. Remove retainer plates.
12. Remove each plug (2), control valve (3) and spring (4) from the
upper body (5).
SDIA2125E
SDIA2126E
SDIA2127E
WDIA0284E

TF-122
CENTER CASE
Revision: August 20072004 QX56
MAINSHAFT REAR BEARING
1. Remove mainshaft rear bearing from center case, using Tool
MAIN OIL PUMP
1. Remove bolts as shown to detach main oil pump.
2. Remove outer gear, inner gear, and main oil pump cover from
main oil pump housing.
3. Remove seal ring from the main oil pump cover.Tool number : KV38100300 (J-25523)
SDIA2129E
SDIA2130E
SDIA2131E
SDIA2132E

TF-130
FRONT CASE
Revision: August 20072004 QX56
13. Remove the mainshaft front bearing from the front case, using
Tool.
Tool number : ST33200000 (J-26082)
SDIA2178E

FRONT CASE
TF-131
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Revision: August 20072004 QX56
FRONT CASEPFP:33107
InspectionEDS00191
PLANETARY CARRIER

Measure end play of each pinion gear, and make sure the mea-
surement is within specification shown below. If out of specifica-
tion, replace planetary carrier assembly with new one.

Check working face of each gear, bearing and others for dam-
age, burrs, partial wear, dents and other abnormality. If any is
found, replace planetary carrier assembly with new one.
SUN GEAR

Check if oil passage of sun gear assembly is clogged. For this,
try to pass a 3.6 mm (0.142 in) dia. wire through oil passage as
shown.

Check sliding/contact surface of each gear, bearing and others
for damage, burrs, partial wear, dents, and other abnormality. If
any is found, replace sun gear assembly with new one.
INTERNAL GEAR

Check internal gear teeth for damage, partial wear, dents and
other abnormality. If any is found, replace internal gear with new
one.
SHIFT ROD COMPONENTS

Check working face of shift rod and fork for wear, partial wear,
bending and other abnormality. If any is found, replace with new
one.Pinion gear end play : 0.1 - 0.7 mm (0.004 - 0.028 in)
PDIA0185E
PDIA0186E
SMT008D
SMT009D

CENTER CASE
TF-133
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Revision: August 20072004 QX56
CENTER CASEPFP:33105
InspectionEDS00192
BEARINGS
1. Make sure bearings roll freely and are free from noise, pitting
and cracks.
SUB-OIL PUMP
1. Check inner and outer circumference, tooth face, and side-face
of inner and outer gears for damage or abnormal wear.
2. Measure side clearance between sub oil pump housing edge
and inner gear/outer gear.
3. Make sure side clearance is within specification. If the measure-
ment is out of specification, replace inner and outer gears
together with new ones as a set.
MAIN OIL PUMP
1. Check inner and outer circumference, tooth face, and side-face
of inner and outer gears for damage or abnormal wear.
2. Measure side clearance between main oil pump housing edge
and inner gear/outer gear.
3. Make sure side clearance is within specification. If the measure-
ment is out of specification, replace inner and outer gears with
new ones as a set.
MAINSHAFT

Check surfaces which contact sun gear, clutch drum, clutch hub,
press flange, clutch piston, each bearing, etc. for damage, peel,
partial wear, dents, bending, or other abnormal damage. If any is
found, replace with new one.
SDIA2175E
Specification : 0.015 - 0.035 mm (0.0006 - 0.0014 in)
SDIA2173E
Specification : 0.015 - 0.035 mm (0.0006 - 0.0014 in)
SDIA2174E
SMT944C

TF-134
CENTER CASE
Revision: August 20072004 QX56
CONTROL VALVE

Check resistance between terminals of 4WD solenoid valve, 2-
4WD shift solenoid valve and transfer fluid temperature sensor.
Refer to TF-95, "
Component Inspection" .

Check sliding faces of control valves and plugs for abnormality.
If any is found, replace the control valve assembly with new one.
Refer to TF-154, "
Control Valve" .
CAUTION:
Replace control valve body together with clutch return
spring as a set.

Check each control valve spring for damage or distortion, and
also check its free length, outer diameter and wire diameter. If
any damage or fatigue is found, replace control valve body with
new one. Refer to TF-154, "
Control Valve" .
CAUTION:
Replace control valve body together with clutch return spring
as a set.
CLUTCH

Check drive plate facings and driven plate for damage, cracks or
other abnormality. If any abnormalities are found, replace with
new one.

Check the thickness of drive plate facings and driven plate.
Refer to TF-153, "
CLUTCH" .
CAUTION:

Measure facing thickness at 3 points to take an average.

Check all the drive and driven plates.

Check return spring for damage or deformation.

Do not remove spring from the plate
PDIA0183E
SMT947C
SMT948C
SMT949C

TF-136
FRONT CASE
Revision: August 20072004 QX56
FRONT CASEPFP:33107
AssemblyEDS00193
PLANETARY CARRIER, SUN GEAR AND INTERNAL GEAR
1. Install new oil seal until it is seated flush with end face of the
front case, using Tool.
NOTE:

Before installing, apply ATF or petroleum jelly to new oil seal
lip.

Do not reuse oil seal.
2. Install internal gear with its groove facing snap ring into front
case. Then secure it with new snap ring.
NOTE:
Do not reuse snap ring.
3. Set mainshaft front bearing into front case and install, using
Tool.
4. Install new snap ring into front case.
NOTE:
Do not reuse snap ring.
5. Install shift cross to front case.Tool number : KV38100500 ( — )
SDIA2177E
WDIA0100E
Tool number : ST30720000 (J-25405)
SDIA2172E
SDIA2171E

FRONT CASE
TF-137
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Revision: August 20072004 QX56
6. Install oil new seal in front case, using Tool.
NOTE:

Before installing, apply ATF or petroleum jelly to seal lip.

Do not reuse oil seal.
7. Install the shift lever to the shift cross, and lock pin and tighten to
specified torque. Refer to TF-110, "
Transfer Components" .
8. Install the carrier bearing to the sun gear assembly, using Tool.
9. Install new snap ring to sun gear assembly, using suitable tool.
NOTE:
Do not reuse snap ring.
10. Apply ATF to the circumference of the new metal busing prior to
installing it to the sun gear assembly, using Tool.
NOTE:
Do not reuse old metal bushing.
11. Install the needle bearing to the sun gear assembly, using Tool.
NOTE:

Before installing, apply ATF to needle bearing.

Do not reuse old needle bearing.Tool number : ST22360002 (J25679-01)
SDIA2182E
To o l n u m b e r
A : ST30911000 ( — )
B : KV31103300 ( — )
SDIA2179E
SDIA2148E
Dimension A : 7.7 - 8.3 mm (0.303 - 0.327 in)
Tool number : ST35300000 ( — )
SDIA2187E
Dimension B : 62.5 - 63.1 mm (2.461 - 2.484 in)
Tool number : ST33220000 ( — )
SDIA2478E