2009 INFINITI QX56 clutch

TRANSFER ASSEMBLYDLN-161
< DISASSEMBLY AND ASSEMBLY > [ATX14B]
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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
< DISASSEMBLY AND ASSEMBLY > [ATX14B]
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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-166
< DISASSEMBLY AND ASSEMBLY >[ATX14B]
TRANSFER ASSEMBLY
14. Tighten the bolts to the specified torque. Refer to
DLN-142, "Dis-
assembly and Assembly".
15. Apply ATF to the new D-rings, and install them to the clutch pis- ton.
CAUTION:
Do not reuse D-rings.
16. Install the thrust needle bearing race to the clutch piston.
17. 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.
18. 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.
19. Thread the new oil pressure check plug in 1 or 2 pitches and apply sealant to the oil pressu re check plug threads. Tighten to
the specified torque. Refer to DLN-142, "Disassembly and
Assembly".
SDIA2119E
SDIA2781E
SDIA2189E
SDIA2190E
SDIA3188E
Revision: December 20092009 QX56

TRANSFER ASSEMBLYDLN-167
< DISASSEMBLY AND ASSEMBLY > [ATX14B]
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 Use Genuine Silicone RTV or equivalent. Refer to GI-15, "Recommended Chemical Products and
Sealants".
CAUTION:
Do not reuse oil pressure check plug.
20. Install the new snap ring to the clutch hub using suitable tool. CAUTION:
Do not reuse snap ring.
21. Apply petroleum jelly to the needle bearing, and install the nee- dle bearing, spacer, clutch drum and clutch hub to the main-
shaft.
22. Install the new snap ring to the mainshaft. CAUTION:
Do not reuse snap rings.
23. Apply ATF each plate, then install them into the clutch drum as shown.
WDIA0101E
WDIA0129E
SDIA2192E
SDIA2193E
Revision: December 20092009 QX56

DLN-168
< DISASSEMBLY AND ASSEMBLY >[ATX14B]
TRANSFER ASSEMBLY
24. Install the return spring assembly into the clutch hub.
25. Install the press flange by aligning the notches to the clutch hub
as shown.
26. Press the press flange to install the new snap ring into snap ring groove on mainshaft using Tools.
CAUTION:
Do not reuse snap ring.
27. Install the new snap ring to the mainshaft using suitable tool. CAUTION:
Do not reuse snap ring.
28. Apply ATF to the thrust needle bearing and install it on the press flange.
SMT911C
SDIA2194E
Tool number A: ST22452000 (J-34335)
B: ST30911000 ( — )
C: KV31103300 ( — )
SDIA2111E
SDIA2112E
SDIA2109E
Revision: December 20092009 QX56

TRANSFER ASSEMBLYDLN-171
< DISASSEMBLY AND ASSEMBLY > [ATX14B]
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39. Remove all the sealant from the switch location area and inside the center case.
CAUTION:
Remove old sealant adhering to mounting surfaces. Also
remove any moisture, oil, or foreign material adhering to
application and mounting surfaces.
40. Thread the ATP switch and neutral-4LO switch in one to two pitches and apply sealant to the th reads of the switches. Tighten
to the specified torque. Refer to DLN-142, "Disassembly and
Assembly".
 Use Genuine Silicone RTV or equivalent. Refer to GI-15,
"Recommended Chemical Pr oducts and Sealants".
NOTE:
 Neutral-4LO switch harness connector is gray.
 ATP switch harness connector is black.
41. Install the front drive shaft rear bearing using Tools.
42. Install the front drive shaft to the front bearing using Tools.
43. Install the drive chain to the front drive shaft and clutch drum. CAUTION:
Install drive chain by aligning identification marks to the
rear as shown. Tool number A: KV40100621 (J-25273)
B: ST30032000 (J-26010-01)SDIA3435E
SDIA2198E
Tool number A: KV40100621 (J-25273)B: ST30032000 (J-26010-01)
SDIA2199E
SDIA2200E
Revision: December 20092009 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)
DLN-179
< SERVICE DATA AND SPECIFICATIONS (SDS) [ATX14B]
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SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
General SpecificationINFOID:0000000005874984
Inspection and AdjustmentINFOID:0000000005874985
CLEARANCE BETWEEN INNER GEAR AND OUTER GEAR
Unit: mm (in)
CLUTCH
Unit: mm (in)
PINION GEAR END PLAY
Unit: mm (in)
CLEARANCE BETWEEN SHIFT FORK AND SLEEVE
Unit: mm (in)
SELECTIVE PARTS
Sub-oil Pump
Unit: mm (in)
*: Always check with the Parts Department for the latest parts information. Applied model
4WD
VK56DE A/T
Transfer model AT X 1 4 B
Fluid capacity (Approx.) (US qt, lmp qt) 3.0 (3-1/8, 2-5/8)
Gear ratio High 1.000
Low 2.625
Number of teeth Planetary
gear
Sun gear 57
Internal gear 91
Front drive sprocket 38
Front drive shaft 38
Item Specification
Sub-oil pump 0.015 - 0.035 (0.0006 - 0.0014)
Main oil pump 0.015 - 0.035 (0.0006 - 0.0014)
Item Limit value
Drive plate 1.4 (0.055)
Item Standard
Pinion gear end play 0.1 - 0.7 (0.004 - 0.028)
Item Standard
Shift fork and sleeve Less than 0.36 (0.0142)
Gear thickness Part number*
Inner gear Outer gear
9.27 - 9.28 (0.3650 - 0.3654) 31346 0W462 31347 0W462
9.28 - 9.29 (0.3654 - 0.3657) 31346 0W461 31347 0W461
9.29 - 9.30 (0.3657 - 0.3661) 31346 0W460 31347 0W460
Revision: December 20092009 QX56