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17. Remove the snap ring from the mainshaft using suitable tool.
18. Remove the press flange from the mainshaft.
19. Remove the return spring assembly from the clutch hub.
20. Remove each plate from the clutch drum.
21. Remove the snap ring from the mainshaft.
SDIA2112E
SMT910C
SMT911C
SMT912C
SDIA2113E
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22. Remove the mainshaft from the clutch drum and clutch hub
using suitable tool.
23. Remove the needle bearing and spacer from the mainshaft.
24. Remove the snap ring from the clutch hub using suitable tool.
25. Remove the oil pressure check plug from the oil pressure check port.
26. Apply air gradually from the oil pressure check port, and remove the clutch piston assembly from the center case.
27. Remove the thrust needle bearing race from the clutch piston by hooking a edge into 3 notches of the thrust needle bearing race
using suitable tool.
CAUTION:
Do not damage clutch piston or thrust needle bearing race.
SMT914C
WDIA0101E
WDIA0227E
SDIA2116E
SDIA2118E
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28. Remove the two D-rings from the clutch piston.
29. Remove the mainshaft rear bearing from the center case using Tool.
30. Remove the two bolts and oil strainer.
31. Remove the two O-rings from the oil strainer.
32. Remove the snap ring. Then push the connector assembly into the center case to remove the control valve assembly.
SDIA2781E
Tool number : KV38100300 (J-25523)
SDIA2129E
SDIA2119E
SDIA2782E
SDIA2122E
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33. Remove the control valve assembly bolts.
34. Remove the control valve assembly.
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.
35. Remove the lip seals from the 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.
36. Remove the transfer motor bolts and motor from the center case. Then remove the O-ring from the transfer motor.
37. Remove the sub oil pump cover bolts.
38. Thread two bolts (M4 x 0.8) into the holes of sub oil pump cover as shown, and pull out to remove the sub oil pump assembly.
SDIA2121E
SDIA2123E
SDIA2133E
SDIA2134E
SMT934C
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39. Remove the outer gear and inner gear from the sub oil pump housing.
40. Remove the oil filter bolts and oil filter. CAUTION:
Do not damage center case and oil filter.
Loosen bolts and detach oil filter evenly.
41. Remove the O-rings (1) from the oil filter (2).
42. Remove the oil filter stud from the oil filter.
43. Remove the O-ring from the oil filter stud.
Control Valve Assembly
1. Disassemble the control valve assembly with the following procedure. 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 resi dual magnetism stays during disassembly.
SDIA2135E
SDIA2136E
WDIA0285E
SDIA3180E
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a. Remove all the bolts except for the two shown.
b. Remove the following from the control valve assembly:
Clutch pressure solenoid valve
Clutch pressure switch
2-4WD shift solenoid valve
Line pressure switch
Transfer fluid temperature sensor
c. Remove the O-rings from each solenoid valve, switch and termi- nal body.
d. Place the control valve with the lower body facing up. Remove the two bolts, and then remove the lower body and separator
plate from the upper body.
CAUTION:
Do not drop relief balls. Detach lower body carefully.
e. Make sure the reverse balls, relief balls, relief springs, accumu- lator pistons and valve springs are securely installed as shown,
and remove them.
f. Remove the retainer plates.
WDIA0198E
WDIA0199E
WDIA0200E
SDIA2126E
SDIA2127E
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g. Remove each retainer plate (1), plug (2), control valve (3) and spring (4) from the upper body (5).
INFINITI QX56 2009 Factory Service Manual
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g. Remove each retainer plate (1), plug (2), control valve (3) and spring (4) from the upper body (5).](/manual-img/42/57031/w960_57031-1214.png)
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g. Remove each retainer plate (1), plug (2), control valve (3) and spring (4) from the upper body (5).
INSPECTION AFTER DISASSEMBLY
Shift Rod Components
Check the working face of the shift rod and fork for wear, partialwear, bending and other abnormality. If any is found, replace with a
new one.
Measure the clearance between the shif t fork and sleeve. If it is out
of specification, replace it with a new one.
Planetary Carrier
Measure the end play of each pinion gear. If it is out of specifica- tion, replace the planetary carrier assembly with a new one.
Check the working face of each gear and bearing for damage, burrs, partial wear, dents and other abnormality. If any is found,
replace the planetary carrier assembly with a new one.
Sun Gear
WDIA0284E
SMT009D
Specification : Less than 0.36 mm (0.0142 in)
SMT010D
Pinion gear end play : 0.1 - 0.7 mm (0.004 - 0.028 in)
PDIA0185E
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Check if the oil passage of the sun gear assembly is clogged. For
this, try to pass a 3.6 mm (0.142 in) dia. pin through the oil pas-
INFINITI QX56 2009 Factory Service Manual
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Check if the oil passage of the sun gear assembly is clogged. For
this, try to pass a 3.6 mm (0.142 in) dia. pin through the oil pas-](/manual-img/42/57031/w960_57031-1215.png)
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Check if the oil passage of the sun gear assembly is clogged. For
this, try to pass a 3.6 mm (0.142 in) dia. pin through the oil pas-
sage as shown.
Check the sliding and contact surface of each gear and bearing for
damage, burrs, partial wear, dents, and other abnormality. If any is
found, replace the sun gear assembly with a new one.
Internal Gear
Check the internal gear teeth for damage, partial wear, dents andother abnormality. If any is found, replace the internal gear with a
new one.
Gears and Drive Chain
Check the gear faces and shaft for wear, cracks, damage, and sei-zure.
Check the surfaces which contact the sun gear, clutch drum, clutch hub, press flange, clutch piston and each bearing for damage,
peel, partial wear, dents, bending, or other abnormal damage. If
any is found, replace with a new one.
Bearing
Make sure the bearings roll freely and are free from noise, pittingand cracks.
Main Oil Pump
PDIA0186E
SMT008D
SMT944C
SDIA2175E
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