INFINITI QX56 2004 Factory Service Manual

TF-116
CENTER CASE
Revision: August 20072004 QX56
MAINSHAFT AND CLUTCH DRUM
1. Set center case on press stand. Remove mainshaft from center
case.
2. Remove thrust needle bearing from press flange.
3. Remove snap ring from mainshaft, using suitable tool.
4. Press flange as shown, using Tool. Press drift until snap ring is
out of place.
SDIA2108E
SDIA2109E
SDIA2 110 E
Tool number
A : ST22452000 (J-34335)
B : ST30911000 ( — )
C : KV31103300 ( — )
SD I A 2 111E

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-119
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Revision: August 20072004 QX56
3. Remove the two D-rings from clutch piston.
4. Remove thrust needle bearing race from clutch piston, using
suitable tool by hooking a edge into 3 notches of thrust needle
bearing race.
CAUTION:
Be careful not to damage the clutch piston.
CONTROL VALVE
CAUTION:

Do not reuse any part that has been dropped or damaged.

Make sure valve is assembled in the proper direction.

Do not use a magnet because residual magnetism stays during disassembly.
1. Remove two bolts, and remove oil strainer.
2. Remove two O-rings from oil strainer.
SDIA2 117 E
SDIA2 118 E
SDIA2 119 E
SDIA2120E

TF-120
CENTER CASE
Revision: August 20072004 QX56
3. Remove control valve assembly bolts.
4. Remove snap ring. Then push connector assembly into center
case to remove control valve assembly.
5. Remove lip seals from center case.
CAUTION:
There are two kinds of lip seals (lip seal of large inner diam-
eter: 5 pieces, lip seal of small inner diameter: 2 pieces).
Confirm the position before disassembly.
6. Remove all bolts except for the two as shown.
7. Remove 4WD solenoid valve, clutch pressure switch, 2-4WD
shift solenoid valve, line pressure switch, and transfer fluid tem-
perature sensor from control valve assembly.
SDIA2121E
SDIA2122E
SDIA2123E
SDIA2124E
PDIA0183E

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

CENTER CASE
TF-123
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Revision: August 20072004 QX56
SUB OIL PUMP
1. Remove bolts to detach transfer motor from center case. Then
remove O-ring from the transfer motor.
2. Remove sub oil pump cover bolts.
3. Thread two bolts (M4 x 0.8) into the holes of sub oil pump cover
as shown, and pull out to remove sub oil pump assembly.
4. Remove sub oil pump cover, outer gear, inner gear, and O-ring
from sub oil pump housing.
SDIA2133E
SDIA2134E
SMT934C
SDIA2135E

TF-124
CENTER CASE
Revision: August 20072004 QX56
OIL FILTER
1. Remove bolts for oil filter.
2. Remove the oil filter using suitable tool as shown.
3. Remove the O-rings (1) from the oil filter (2).
4. Remove the filter stud from oil filter.
5. Remove O-ring from the filter stud.
SDIA2136E
SDIA2137E
WDIA0285E
PDIA0184E

FRONT CASE
TF-125
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Revision: August 20072004 QX56
FRONT CASEPFP:33107
DisassemblyEDS00190
1. Remove rear case from center case. Refer to TF-112, "Disassembly" .
2. Remove the lock pin nut from the lock pin, using suitable tool.
a. Remove the lock pin.
3. Remove the oil seal from the front case, using suitable tool.
CAUTION:
Be careful not to damage the front case and shift cross.
4. Remove front case from center case.
SHIFT ROD COMPONENTS
1. Remove check plug, then check spring and check ball.
a. Remove wait detection switch.
SDIA2150E
SDIA2166E
SDIA2138E
SDIA2139E