2009 INFINITI QX56 4WD

DLN-130
< ON-VEHICLE REPAIR >[ATX14B]
TRANSFER CONTROL UNIT
ON-VEHICLE REPAIR
TRANSFER CONTROL UNIT
Removal and InstallationINFOID:0000000004193525
REMOVAL
1. Set transfer state as 2WD when 4WD shift switch is
at 2WD, or as AUTO when 4WD shift switch is at
AUTO.
CAUTION:
When removing transfer co ntrol unit, transfer state must be at 2WD or AUTO.
2. Turn the ignition switch OFF and disconnect negative battery terminal.
3. Remove the lower instrument panel RH. Refer to IP-17, "Exploded View"
.
4. Disconnect the two transfer control unit connectors.
5. Remove the transfer control unit bolts.
6. Remove the transfer control unit.
INSTALLATION
Installation is in the reverse order of removal.
 When installing the transfer control unit, tighten bolts to the specified torque.
CAUTION:
Do not connect harness connector to transfer control unit when 4WD shift switch is at 4LO.
 After the installation, check perform self-diagnosis. Refer to DLN-6, "Work Flow"
. If NG, adjust position
between transfer assembly and transfer control unit. Refer to DLN-121, "Precaution for Transfer Assembly
and Transfer Control Unit Replacement".
BDIA0014E
Transfer control unit bolts : 3.4 N·m (0.35 kg-m, 30 in-lb)
Revision: December 20092009 QX56

DLN-136
< ON-VEHICLE REPAIR >[ATX14B]
TRANSFER CONTROL DEVICE
TRANSFER CONTROL DEVICE
Removal and InstallationINFOID:0000000005874980
REMOVAL
CAUTION:
Change vehicle state to AUTO, and then
remove and install transfer control device.
1. Remove front propeller shaft. Refer to DLN-186, "Removal and Installation"
.
2. Disconnect the transfer control device connector.
3. Remove transfer control lever.
4. Disconnect vacuum line.
5. Remove transfer control device.
INSTALLATION
CAUTION:
Check 4WD shift indicator after installation. Refer to DLN-121, "Precaution for Transfer Assembly and
Transfer Control Unit Replacement".
Installation is in the reverse order of removal.
1. Shift lever 2. Actuator
SDIA2654E
Revision: December 20092009 QX56

TRANSFER ASSEMBLYDLN-141
< REMOVAL AND INSTALLATION > [ATX14B]
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REMOVAL AND INSTALLATION
TRANSFER ASSEMBLY
Removal and InstallationINFOID:0000000005874982
REMOVAL
1. Set transfer state as 2WD when 4WD shift switch is at 2WD.
2. Remove the undercovers using power tool.
3. Drain the transfer fluid. Refer to DLN-129, "Replacement"
.
4. Remove the center exhaust tube and main muffler. Refer to EX-6, "Removal and Installation"
.
5. Remove the front and rear propeller shafts. Refer to DLN-186, "Removal and Installation"
(front), DLN-
196, "Removal and Installation" (rear).
CAUTION:
Do not damage spline, sleeve yoke and rear oi l seal when removing rear propeller shaft.
NOTE:
Insert a plug into the rear oil seal after removing the rear propeller shaft.
6. Remove the A/T nuts from the A/T crossmember. Refer to TM-216, "Removal and Installation (4WD)"
.
7. Position two suitable jacks under the A/T and transfer assembly.
8. Remove the crossmember. Refer to TM-216, "Removal and Installation (4WD)"
.
WARNING:
Support A/T and transfer assembly using two suitable jacks while removing crossmember.
9. Disconnect the electrical c onnectors from the following:
 ATP switch
 Neutral 4LO switch
 Wait detection switch
 Transfer motor
 Transfer control device
 Transfer terminal cord assembly
10. Disconnect each air breather hose from the following. Refer to DLN-137, "Removal and Installation"
.
 Actuator
 Breather tube (transfer)
 Transfer motor
11. Remove the transfer control dev ice from the extension housing.
12. Remove the transfer to A/T and A/T to transfer bolts.
13. Remove the transfer assembly. WARNING:
Support transfer assembly with su itable jack while removing it.
CAUTION:
Do not damage rear oil seal (A/T).
INSTALLATION
Installation is in the reverse order of removal.
 Tighten the bolts to specification.
 Fill the transfer with new fluid and check for fluid leakage and fluid level. Refer to DLN-129, "Replacement"
.
 Start the engine for one minute. Then stop the engine and recheck the transfer fluid. Refer to DLN-129, "Inspection"
.
Transfer bolt torque : 36 N·m (3.7 kg-m, 27 ft-lb)
SMT872C
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-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

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

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

DLN-190
< SERVICE DATA AND SPECIFICATIONS (SDS) [PROPELLER SHAFT: 2F1310]
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
General SpecificationINFOID:0000000003772208
Unit: mm (in)
Propeller Shaft Runout
Unit: mm (in)
Propeller Shaft Joint Flex Effort
Unit: N·m (kg-m, in-lb)
Journal Axial Play
Unit: mm (in)
Snap RingINFOID:0000000003772209
Model 2F1310 (4WD)
Unit: mm (in)
*Always check with the Parts Department for the latest parts information.Applied model
4WD
VK56DE A/T
Propeller shaft model 2F1310
Number of joints 2
Coupling method with front final drive Flange type
Coupling method with transfer Flange type
Shaft length (Spider to spider) 696 (27.40)
Shaft outer diameter 63.5 (2.5)
Item Limit
Propeller shaft runout 0.6 (0.024)
Item Limit
Propeller shaft joint flex effort 1.96 (0.20, 17) or less
Item Limit
Journal axial play 0.02 (0.0008)
Thickness Color Part Number*
1.99 (0.0783) White 37146-C9400
2.02 (0.0795) Yellow 37147-C9400 2.05 (0.0807) Red 37148-C9400
2.08 (0.0819) Green 37149-C94002.11 (0.0831) Blue 37150-C9400
2.14 (0.0843) Light brown 37151-C9400
2.17 (0.0854) Black 37152-C9400
2.20 (0.0866) No paint 37153-C9400
Revision: December 20092009 QX56