INFINITI QX56 2006 Factory Service Manual

TF-156
TRANSFER ASSEMBLY
Revision: November 20092006 QX56
11. Remove the snap ring and washer holder from the mainshaft.
12. Remove the C-rings from the mainshaft using suitable tool.
13. Set the center case on the press stand. Remove the mainshaft
from the center case.
14. Remove the snap ring from the mainshaft using suitable tool.
15. Remove the thrust needle bearing from the press flange.
SDIA2104E
SDIA2105E
SDIA2108E
SDIA2110E
SDIA2109E

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16. Press the press flange until the snap ring is out of place using
To o l s .
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. Tool number A: ST22452000 (J-34335)
B: ST30911000 ( — )
C: KV31103300 ( — )
S D I A 2 111 E
SDIA2112E
SMT910C
SMT911C
SMT912C

TF-158
TRANSFER ASSEMBLY
Revision: November 20092006 QX56
21. Remove the snap ring from the mainshaft.
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.
SDIA2113E
SMT914C
WDIA0101E
SDIA3188E
SDIA2116E

TRANSFER ASSEMBLYTF-159
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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.
28. Remove the two D-rings from the clutch piston.
29. Remove the mainshaft rear bearing from the center case using To o l .
30. Remove the two bolts and oil strainer.
31. Remove the two O-rings from the oil strainer.
SDIA2118E
SDIA2781E
Tool number : KV38100300 (J-25523)
SDIA2129E
SDIA2119E
SDIA2782E

TF-160
TRANSFER ASSEMBLY
Revision: November 20092006 QX56
32. Remove the snap ring. Then push the connector assembly into
the center case to remove the control valve assembly.
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. 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 residual magnetism stays during disassembly.
a. Remove all the bolts except for the two shown.
SDIA2122E
SDIA2121E
SDIA2123E
WDIA0198E

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b. Remove the following from the control valve assembly:

Clutch pressure solenoid valve

2-4WD shift solenoid valve

Clutch pressure switch

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.
g. Remove each control valve, spring and plug.
WDIA0199E
SDIA3187E
SDIA2126E
SDIA2127E
SDIA3317E

TF-162
TRANSFER ASSEMBLY
Revision: November 20092006 QX56
37. Remove the transfer motor bolts and motor from the center
case. Then remove the O-ring from the transfer motor.
38. Remove the sub oil pump cover bolts.
39. 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.
40. Remove the outer gear and inner gear from the sub oil pump housing.
41. Remove the oil filter bolts and oil filter. CAUTION:

Do not damage center case and oil filter.

Loosen bolts and detach oil filter evenly.
SDIA2133E
SDIA2134E
SMT934C
SDIA2135E
SDIA2136E

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42. Remove the O-rings (1) from the oil filter (2).
43. Remove the oil filter stud from the oil filter.
44. Remove the O-ring from the oil filter stud.
INSPECTION AFTER DISASSEMBLY
Shift Rod Components

Check the working face of the shift rod and fork for wear, partial
wear, bending and other abnormality. If any is found, replace
with a new one.

Measure the clearance between the shift fork and sleeve. If it is
out of specification, replace it with a new one.
WDIA0285E
SDIA3180E
SMT009D
Specification : Less than 0.36 mm (0.0142 in)
SMT010D

TF-164
TRANSFER ASSEMBLY
Revision: November 20092006 QX56
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

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
passage 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
and other 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
seizure.

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.Pinion gear end play : 0.1 - 0.7 mm (0.004 - 0.028 in)
PDIA0185E
PDIA0186E
SMT008D
SMT944C

TRANSFER ASSEMBLYTF-165
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Bearing

Make sure the bearings roll freely and are free from noise, pit-
ting and cracks.
Main Oil Pump
1. Check the inner and outer circumference, tooth face, and side-
face of the inner and outer gears for damage or abnormal wear.
2. Measure the side clearance between the main oil pump housing edge and the inner and outer gears.
3. Make sure the side clearance is within specification. If the mea- surement is out of specification, replace the inner and outer
gears with new ones as a set. Refer to TF-165, "
Main Oil Pump"
.
Sub-oil Pump
1. Check the inner and outer circumference, tooth face, and side-
face of the inner and outer gears for damage or abnormal wear.
2. Measure the side clearance between the sub oil pump housing edge and the inner and outer gears.
3. Make sure the side clearance is within specification. If the mea- surement is out of specification, replace the inner and outer
gears with new ones as a set. Refer to TF-165, "
Sub-oil Pump" .
Control Valve

Check resistance between the terminals of the clutch pressure
solenoid valve, 2-4WD shift solenoid valve, clutch pressure
switch, line pressure switch and the transfer fluid temperature
sensor. Refer to TF-90, "
COMPONENT INSPECTION" (clutch
pressure solenoid valve), TF-94, "
COMPONENT INSPECTION"
(2-4WD solenoid valve), TF-107, "COMPONENT INSPECTION"
(clutch pressure switch), TF-110, "COMPONENT INSPECTION"
(line pressure switch) and TF-104, "COMPONENT INSPEC-
TION" (transfer fluid temperature sensor).
SDIA2175E
Specification : 0.015 - 0.035 mm (0.0006 - 0.0014 in)
SDIA2174E
Specification : 0.015 - 0.035 mm (0.0006 - 0.0014 in)
SDIA2173E
WDIA0199E