INFINITI QX56 2009 Factory Service Manual

TRANSFER ASSEMBLYDLN-155
< DISASSEMBLY AND ASSEMBLY > [ATX14B]
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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
Revision: December 20092009 QX56

DLN-156
< DISASSEMBLY AND ASSEMBLY >[ATX14B]
TRANSFER 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. 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
Revision: December 20092009 QX56

TRANSFER ASSEMBLYDLN-157
< DISASSEMBLY AND ASSEMBLY > [ATX14B]
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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
Revision: December 20092009 QX56

DLN-158
< DISASSEMBLY AND ASSEMBLY >[ATX14B]
TRANSFER ASSEMBLY
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
Revision: December 20092009 QX56

TRANSFER ASSEMBLYDLN-159
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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
Revision: December 20092009 QX56

DLN-160
< DISASSEMBLY AND ASSEMBLY >[ATX14B]
TRANSFER ASSEMBLY
 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
Revision: December 20092009 QX56

TRANSFER ASSEMBLYDLN-161
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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 specificat ion, replace the inner and outer
gears with new ones as a set. Refer to DLN-142, "Disassembly
and Assembly".
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 specificat ion, replace the inner and outer
gears with new ones as a set. Refer to DLN-179, "Inspection
and Adjustment".
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 TM-26, "Control Valve"
(clutch pressure solenoid valve),
TM-26, "Control Valve"
(2-4WD solenoid valve), TM-26, "Control
Va l v e " (clutch pressure switch), TM-26, "Control Valve" (line pres-
sure switch) and TM-26, "Control Valve"
(transfer fluid temperature
sensor).
 Check the sliding faces of the control valves and plugs for abnor- mality. If any is found, replace t he control valve assembly with a
new one. Refer to DLN-142, "Disassembly and Assembly"
.
CAUTION:
Replace control valve body together with clutch return spring
as a set. Specification : Refer to
DLN-179, "Inspection and
Adjustment"SDIA2174E
Specification : Refer to DLN-179, "Inspection and Ad-
justment"SDIA2173E
WDIA0199E
SMT947C
Revision: December 20092009 QX56

DLN-162
< DISASSEMBLY AND ASSEMBLY >[ATX14B]
TRANSFER ASSEMBLY
 Check each control valve spring for damage or distortion. Also
check its free length, outer diamet er and wire diameter. If any dam-
age or fatigue is found, replace the control valve body with a new
one. Refer to DLN-142, "Disassembly and Assembly"
.
CAUTION:
Replace control valve body togeth er with clutch return spring
as a set.
Clutch
 Check the drive plate facings and driven plate for damage, cracks or other abnormality. If any abnormalities are found, replace with a
new one.
 Check the thickness of the drive plate facings and driven plate.
Refer to DLN-179, "Inspection and Adjustment"
.
CAUTION:
 Measure facing thickness at 3 points to take an average.
 Check all drive an d driven plates.
 Check return spring for damage or deformation.
 Do not remove spring from plate.
Return Spring
 Check the stamped mark shown. T hen, check that the free lengths,
(include thickness of plate) are within specifications. If any abnor-
mality is found, replace with a new return spring assembly of the
same stamped number. Refer to DLN-179, "Inspection and Adjust-
ment".
ASSEMBLY
Control Valve Assembly
1. Assemble 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 assembly.
a. Clean the upper body (5), control valves (3) and springs (4) with cleaning agent, and dry with compressed air.
b. Dip the control valves in ATF, and apply ATF to the valve-mount- ing area of the upper body.
SMT948C
SMT949C
SDIA2176E
WDIA0284E
Revision: December 20092009 QX56

TRANSFER ASSEMBLYDLN-163
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c. Install each control valve (3), springs (4), and plugs (2) to the 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.
d. Install the reverse balls, relief balls and relief springs, accumula- tor pistons and valve springs to the upper body.
e. Install the lower body and separator plate to the upper body. CAUTION:
Do not reuse separator plates.
f. With the lower body down, tighten the two bolts shown.
g. Apply ATF to the new O-rings, and install them to each solenoid valve, switch and terminal body.
CAUTION:
Do not reuse O-rings.
h. Install the following to the control valve assembly:  Clutch pressure solenoid valve
 Clutch pressure switch
 2-4WD shift solenoid valve
 Line pressure switch
 Transfer fluid temperature sensor
Center Case
SDIA2127E
SDIA2126E
WDIA0200E
WDIA0198E
Revision: December 20092009 QX56

DLN-164
< DISASSEMBLY AND ASSEMBLY >[ATX14B]
TRANSFER ASSEMBLY
1. Apply ATF to the new O-ring, and
install it on the oil filter stud.
CAUTION:
Do not reuse O-rings.
2. Install the oil filter stud to the oil filter.
3. Apply ATF to the two new O-rings (1), and install them on the oil filter (2).
CAUTION:
Do not reuse O-rings.
4. Install the oil filter to the center case. Tighten the bolts to the specified torque. Refer to DLN-142, "Disassembly and Assem-
bly".
CAUTION:
 Do not damage oil filter.
 Attach oil filter an d tighten bolts evenly.
5. Install the outer gear and inner gear into the sub oil pump hous- ing, and measure the side clearance. Refer to DLN-142, "Disas-
sembly and Assembly".
6. Align the dowel pin hole and bolt hole of the sub oil pump assembly with the center case. Install the sub oil pump cover.
Then tighten to the specified torque. Refer to DLN-142, "Disas-
sembly and Assembly"
SDIA3180E
WDIA0285E
SDIA2136E
SDIA2135E
SDIA2328E
Revision: December 20092009 QX56