INFINITI QX56 2006 Factory Service Manual

TF-166
TRANSFER ASSEMBLY
Revision: November 20092006 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-165, "
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-166, "
Return 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-183, "
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-166,
"Return Spring" .
SMT947C
SMT948C
SMT949C
SDIA2176E

TRANSFER ASSEMBLYTF-167
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Revision: November 2009 2006 QX56
ASSEMBLY
Center Case
1. Apply ATF to the new O-ring, and install it on the oil filter stud.
CAUTION:
Do not reuse O-ring.
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 TF-146, "
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-165, "
Sub-oil
Pump" .
SDIA3180E
WDIA0285E
SDIA2136E
SDIA2135E

TF-168
TRANSFER ASSEMBLY
Revision: November 20092006 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-146, "
COMPO-
NENTS" .
7. Apply ATF to the new O-ring and install it to the transfer motor. CAUTION:
Do not reuse O-ring.
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-146, "
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.
a. Clean the upper body, control valves and springs 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.
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
SDIA3317E
SDIA2127E

TRANSFER ASSEMBLYTF-169
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Revision: November 2009 2006 QX56
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 new separator plate to the upper body.
CAUTION:
Do not reuse separator plate.
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

2-4WD shift solenoid valve

Clutch pressure switch

Line pressure switch

Transfer fluid temperature sensor
10. Apply ATF to the new 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

TF-170
TRANSFER ASSEMBLY
Revision: November 20092006 QX56
11. Install the control valve assembly to the center case, and tighten
to the specified torque. Refer to TF-146, "
COMPONENTS" .
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.
12. Install the connector assembly into the center case, and secure with a snap ring.
13. Apply ATF to the new O-rings, and install them on the oil strainer.
CAUTION:
Do not reuse O-rings.
14. Install the oil strainer to the control valve assembly.
15. Tighten the bolts to the specified torque. Refer to TF-146,
"COMPONENTS" .
16. Apply ATF to the new D-rings, and install them to the clutch pis- ton.
CAUTION:
Do not reuse D-rings.
SDIA2121E
SDIA2122E
SDIA2782E
SDIA2119E
SDIA2781E

TRANSFER ASSEMBLYTF-171
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Revision: November 2009 2006 QX56
17. Install the thrust needle bearing race to the clutch piston.
18. Install the clutch piston to the center case as shown.
CAUTION:
Install so the fitting protrusion of clutch piston aligns with
the dent of center case.
19. Remove all the sealant from the oil pressure check port and inside the center case.
CAUTION:
Remove old sealant adhering to mating surfaces. Also
remove any moisture, oil, or foreign material adhering to
application and mating surfaces.
20. Thread the new oil pressure check plug in 1 or 2 pitches and apply sealant to the oil pressure check plug threads. Tighten to
the specified torque. Refer to TF-146, "
COMPONENTS" .

Use Genuine Silicone RTV or equivalent. Refer to GI-46,
"RECOMMENDED CHEMICAL PRODUCTS AND SEAL-
ANTS" .
CAUTION:
Do not reuse oil pressure check plug.
21. Install the new snap ring to the clutch hub using suitable tool. CAUTION:
Do not reuse snap ring.
SDIA2189E
SDIA2190E
SDIA3188E
WDIA0101E

TF-172
TRANSFER ASSEMBLY
Revision: November 20092006 QX56
22. Apply petroleum jelly to the needle bearing, and install the nee-
dle bearing, spacer, clutch drum and clutch hub to the main-
shaft.
23. Install the new snap ring to the mainshaft. CAUTION:
Do not reuse snap ring.
24. Apply ATF to each plate, then install them into the clutch drum as shown.
25. Install the return spring assembly into the clutch hub.
26. Install the press flange by aligning the notches to the clutch hub as shown.
WDIA0129E
SDIA2192E
SDIA2193E
SMT911C
SDIA2194E

TRANSFER ASSEMBLYTF-173
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Revision: November 2009 2006 QX56
27. Press the press flange to install the new snap ring into snap ring
groove on mainshaft using Tools.
CAUTION:
Do not reuse snap ring.
28. Install the new snap ring to the mainshaft using suitable tool. CAUTION:
Do not reuse snap ring.
29. Apply ATF to the thrust needle bearing and install it on the press flange.
30. Install the new snap ring to the main shaft. CAUTION:
Do not reuse snap ring.
31. Install the mainshaft rear bearing to the center case using Tool. Tool number A: ST22452000 (J-34335)
B: ST30911000 ( — )
C: KV31103300 ( — )
S D I A 2 111 E
SDIA2112E
SDIA2109E
SDIA2195E
Tool number : ST15310000 (J-25640-B)
SDIA2196E

TF-174
TRANSFER ASSEMBLY
Revision: November 20092006 QX56
32. Press the mainshaft assembly into the center case using Tools.
33. Install the C-rings to the mainshaft.
34. Set the washer holder on the mainshaft, and secure it with a
new snap ring using suitable tool.
CAUTION:
Do not reuse snap ring.
35. Apply petroleum jelly to the stem bleeder and install it to the cen- ter case.
36. Apply ATF to the new seal ring and install it to the main oil pump cover.
CAUTION:
Do not reuse seal ring.Tool number A: ST30911000 ( — )
B: ST33052000 ( — )
SDIA2197E
SDIA2201E
SDIA2104E
SDIA2780E
SDIA2783E

TRANSFER ASSEMBLYTF-175
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Revision: November 2009 2006 QX56
37. Install the inner gear and outer gear in the main oil pump hous-
ing. Then measure the side clearance. Refer to TF-165, "
Main
Oil Pump" .
38. Install the main oil pump housing, outer gear and inner gear to the center case.
39. Install the main oil pump cover to the center case, and tighten to the specified torque. Refer to TF-146, "
COMPONENTS" .
40. Remove all the sealant from the switch mating area and inside the center case.
CAUTION:
Remove old sealant adhering to mating surfaces. Also
remove any moisture, oil, or foreign material adhering to
application and mating surfaces.
41. Thread the ATP switch and neutral-4LO switch in one to two pitches and apply sealant to the threads of the switches. Tighten
to the specified torque. Refer to TF-146, "
COMPONENTS" .

Use Genuine Silicone RTV or equivalent. Refer to GI-46,
"RECOMMENDED CHEMICAL PRODUCTS AND SEAL-
ANTS" .
NOTE:

Neutral-4LO switch harness connector is gray.

ATP switch harness connector is black.
SDIA2174E
SDIA2188E
SDIA2130E
SDIA3435E