INFINITI QX4 2005 Factory Service Manual

TF-158
TRANSFER ASSEMBLY
Revision: October 20052005 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

TRANSFER ASSEMBLY
TF-159
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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.
g. Remove each plug (2), control valve (3) and spring (4) from the
upper body (5).

Retainer plate (1)
WDIA0199E
SDIA2125E
SDIA2126E
SDIA2127E
WDIA0284E

TF-160
TRANSFER ASSEMBLY
Revision: October 20052005 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

TRANSFER ASSEMBLY
TF-161
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42. Remove the O-rings from the oil filter.
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.
SDIA2327E
SDIA2784E
SMT009D
Specification : Less than 0.36 mm (0.0142 in)
SMT010D

TF-162
TRANSFER ASSEMBLY
Revision: October 20052005 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 ASSEMBLY
TF-163
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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-163, "
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-163, "
Sub-oil Pump" .
Control Valve

Check resistance between the terminals of the clutch pressure
solenoid valve, 2-4WD shift solenoid valve, clutch 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) and TF-104, "
COMPONENT INSPECTION" (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

TF-164
TRANSFER ASSEMBLY
Revision: October 20052005 QX56

Check the sliding faces of the control valves and plugs for
abnormality. If any is found, replace the control valve assembly
with a new one. Refer to TF-182, "
Control Valve" .
CAUTION:
Replace control valve body together with clutch return
spring as a set.

Check each control valve spring for damage or distortion. Also
check its free length, outer diameter and wire diameter. If any
damage or fatigue is found, replace the control valve body with a
new one. Refer to TF-182, "
Control Valve Spring" .
CAUTION:
Replace control valve body together 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 TF-164, "
Clutch" .
CAUTION:

Measure facing thickness at 3 points to take an average.

Check all drive and driven plates.

Check return spring for damage or deformation.

Do not remove spring from plate.
Return Spring

Check the stamped mark shown. Then, check that the free
lengths, (include thickness of plate) are within specifications. If
any abnormality is found, replace with a new return spring
assembly of the same stamped number. Refer to TF-164,
"Return Spring" .
SMT947C
SMT948C
SMT949C
SDIA2176E

TRANSFER ASSEMBLY
TF-165
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ASSEMBLY
Center Case
1. Apply ATF to the 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 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 TF-144, "
COMPONENTS" .
CAUTION:

Do not damage oil filter.

Attach oil filter and 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 TF-163, "
Sub-oil
Pump" .
SDIA2784E
WDIA0285E
SDIA2136E
SDIA2135E

TF-166
TRANSFER ASSEMBLY
Revision: October 20052005 QX56
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 TF-144, "
COMPO-
NENTS" .
7. Apply ATF to the O-ring and install it to the transfer motor.
CAUTION:
Do not reuse O-rings.
8. Fit the double-flat end of the transfer motor shaft into the slot of
the sub-oil pump assembly. Then tighten to the specified torque.
Refer to TF-144, "
COMPONENTS" .
CAUTION:
Be sure to install connector bracket.
9. 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.

Retainer plate (1)

Plug (2)
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 (3) in ATF, and apply ATF to the valve-
mounting area of the upper body (5).
c. Install each control valve, spring, and plug to the upper body,
and install retainer plates 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.
SDIA2328E
SDIA2787E
WDIA0284E
SDIA2127E

TRANSFER ASSEMBLY
TF-167
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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 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
10. Apply ATF to lip seals, and install them to the center case.
CAUTION:

Do not reuse lip seals.

There are 2 kinds of lip seals (lip seal of large inner diam-
eter: 5 pieces, lip seal of small inner diameter: 2 pieces).
Confirm their position for installation.
SDIA2126E
WDIA0200E
WDIA0198E
SDIA2123E