2006 INFINITI QX56 height

RFD-16
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
ASSEMBLY INSPECTION AND ADJUSTMENT

Drain the differential gear oil before inspection and adjustment. Refer to RFD-8, "DIFFERENTIAL GEAR
OIL" .

Remove and install the carrier cover as necessary for inspection and adjustment. Refer to RFD-12, "CAR-
RIER COVER" .
Total Preload Torque
1. Remove the side flanges if necessary. Refer to RFD-19, "Side Flange" .
CAUTION:
The side flanges shaft must removed in order to measure total preload torque.
2. Rotate the drive pinion back and forth 2 to 3 times to check for unusual noise and rotation malfunction.
3. Rotate the drive pinion at least 20 times to check for smooth operation of the bearings.
4. Measure the total preload torque using Tool.
NOTE:
Total preload torque = Drive pinion bearing preload torque +
Side bearing preload torque

If the measured value is out of the specification, check and adjust each part. Adjust the drive pinion
bearing preload torque first, then adjust the side bearing preload torque.
CAUTION:
Select a side bearing adjusting washer for right and left individually.
1. Drive pinion lock nut 2. Companion flange 3. Front oil seal
4. Drive pinion front bearing 5. Collapsible spacer 6. Drive pinion rear bearing
7. Drive pinion height adjusting washer 8. Drive pinion 9. Gear carrier
10. Drive gear 11. Pinion mate shaft 12. Lock pin
13. Pinion mate gear 14. Pinion mate thrust washer 15. Side gear
16. Side gear thrust washer 17. Differential case 18. Side bearing
19. Side bearing adjusting washer 20. Bearing cap 21. Carrier cover
22. Filler plug 23. Drain plug 24. Side oil seal
Tool number : ST3127S000 (J-25765-A)
Total preload torque:
2.05 - 4.11 N·m (0.21 - 0.42 kg-m, 19 - 36 in-lb)
SPD884
If the total preload torque is greater than specificationOn drive pinion bearings: Replace the collapsible spacer.
On side bearings: Use thinner side bearing adjusting washers by the same amount on each side. Refer to RFD-33, "
Side Bearing Adjusting
Washer" .
If the total preload torque is less than specification On drive pinion bearings: Tighten the drive pinion lock nut.
On side bearings: Use thicker side bearing adjusting washers by the same amount on each side. Refer to RFD-33, "
Side Bearing Adjust-
ing Washer" .

REAR FINAL DRIVE ASSEMBLYRFD-17
CE F
G H
I
J
K L
M A
B
RFD
Revision: November 2009 2006 QX56
Drive Gear Runout
1. Fit a dial indicator to the drive gear back face.
2. Rotate the drive gear to measure runout.

If the runout is outside of the limit, check the condition of the
drive gear assembly. Foreign material may be caught between
the drive gear and differential case, or the differential case or
drive gear may be deformed.
CAUTION:
Replace drive gear and drive pinion as a set.
Tooth Contact
1. Apply red lead to the drive gear.
NOTE:
Apply red lead to both faces of three to four gears, at four loca-
tions evenly spaced on the drive gear.
2. Rotate the drive gear back and forth several times. Then check for correct drive pinion to drive gear tooth contact as shown.
CAUTION:
Check tooth contact on drive side and reverse side.
3. If the tooth contact is improperly adjusted, follow the procedure below to adjust the pinion height (dimension X).Runout limit : 0.05 mm (0.0020 in) or less
SPD886
SPD357
SDIA0570E
SDIA0517E

RFD-18
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56

If the tooth contact is near the face (face contact), or near the
heel (heel contact), use a thicker drive pinion height adjusting
washers to move the drive pinion closer to the drive gear.
Refer to RFD-33, "
Drive Pinion Height Adjusting Washer" .

If the tooth contact is near the flank (flank contact), or near the
toe (toe contact), use a thinner drive pinion height adjusting
washers to move the drive pinion farther from the drive gear.
Refer to RFD-33, "
Drive Pinion Height Adjusting Washer" .
Backlash
1. Fit a dial indicator to the drive gear face to measure the back-
lash.

If the backlash is outside of the specification, change the thick-
ness of the side bearing adjusting washers.
CAUTION:
Do not change the total thickness of side bearing adjusting washers as it will change the side bearing
preload torque.
Companion Flange Runout
1. Rotate companion flange and check for runout on the outer face of the companion flange using suitable tool.
2. If the runout is outside of the runout limit, follow the procedure below to adjust.
a. Rotate the companion flange on the drive pinion by 90° , 180°
and 270 ° while checking for the position where the runout is
minimum.
b. If the runout is still outside of the runout limit after the companion flange has been rotated on the drive pinion, possible cause
PDIA0440E
PDIA0441E
Backlash : 0.13 - 0.18 mm (0.0051 - 0.0070 in)
If the backlash is greater than specification:
Make side bearing adjusting washer thicker on drive
gear back side, and side bearing adjusting washer
thinner on drive gear tooth side by the same amount.
Refer to RFD-33, "
Side Bearing Adjusting Washer" .
If the backlash is less than specification: Make side bearing adjusting washer thinner on drive
gear back side, and side bearing adjusting washer
thicker on drive gear tooth side by the same amount.
Refer to RFD-33, "
Side Bearing Adjusting Washer" .
SPD513
Runout limit : 0.08 mm (0.0031 in) or less
WDIA0231E

REAR FINAL DRIVE ASSEMBLYRFD-23
CE F
G H
I
J
K L
M A
B
RFD
Revision: November 2009 2006 QX56
8. Remove the drive pinion rear bearing inner race and drive pinion
height adjusting washer using Tool.
9. Remove the drive pinion front and rear bearing outer races by tapping them uniformly using suitable tool.
CAUTION:
Do not damage gear carrier.
INSPECTION AFTER DISASSEMBLY
Clean the disassembled parts. Then inspect the parts for wear or damage. If wear or damage are found, follow
the measures below.
Drive Pinion and Drive Gear

If the drive pinion and drive gear teeth do not mesh or line-up correctly, determine the cause and adjust,
repair, or replace as necessary.

If the drive pinion or drive gear are worn, cracked, damaged, pitted or chipped (by friction) noticeably,
replace with new drive pinion and drive gear.

Drive pinion and drive gear are supplied in matched sets only. Matching numbers on both drive pinion and
drive gear are etched for verification. If a new drive pinion and drive gear set are being used, verify the
numbers of each drive pinion and drive gear before proceeding with assembly.
Bearing

If bearings are chipped (by friction), pitted, worn, rusted, scratched, or unusual noise is coming from bear-
ing, replace with new bearing assembly (as a new set).

Bearing must be replaced with a new one whenever disassembled.
Side Gear and Pinion Mate Gear

If any cracks or damage are found on the surface of the teeth, replace with new one.

If any worn or chipped marks are found on the side of the side gear and pinion mate gear which contact
the thrust washer, replace with new one.

Replace both side gear and pinion mate gear as a set when replacing side gear or pinion mate gear.
Side Gear Thrust Washer and Pinion Mate Thrust Washer

If any chips (by friction), damage, or unusual wear are found, replace with new one.
Gear Carrier

If any wear or cracks are found on the contact sides of gear carrier, replace with new one.
Companion Flange

If any chips (about 0.1mm, 0.004 in) or other damage on the companion flange surface which contacts the
front oil seal lips are found, replace with new one.Tool number: : ST30021000 ( — )
S-PD179
SDIA0817E

RFD-26
REAR FINAL DRIVE ASSEMBLY
Revision: November 20092006 QX56
ASSEMBLY
Drive Pinion Assembly
1. Install the drive pinion front and rear bearing outer races using
To o l s .
CAUTION:
Do not reuse drive pinion front and rear bearing outer race.
2. Select a drive pinion height adjusting washer. Refer to RFD-33, "
Drive Pinion Height Adjusting Washer" .
3. Install the selected drive pinion height adjusting washer to the drive pinion. Press the drive pinion rear bearing inner race to it
using Tool.
CAUTION:

Install the drive pinion height adjusting washer in the
proper direction as shown.

Do not reuse drive pinion rear bearing inner race.
4. Assemble the collapsible spacer to the drive pinion. CAUTION:
Do not reuse collapsible spacer.
5. Apply differential gear oil to the drive pinion rear bearing, and install the drive pinion assembly to the gear carrier.
6. Apply differential gear oil to the drive pinion front bearing, and install the drive pinion front bearing inner race to the drive pinion
assembly.
CAUTION:
Do not reuse drive pinion front bearing inner race.Tool number A: ST15310000 ( — )
B: ST35325000 ( — )
C: ST30621000 ( — )
SPD992
Tool number : ST30022000 ( — )
SPD377
PDIA0492E

SERVICE DATA AND SPECIFICATIONS (SDS)RFD-33
CE F
G H
I
J
K L
M A
B
RFD
Revision: November 2009 2006 QX56
Drive Pinion Height Adjusting Washer
Unit: mm (in)
*: Always check with the Parts Department for the latest parts information.
Side Bearing Adjusting Washer
Unit: mm (in)
*: Always check with the Parts Department for the latest parts information. Thickness
Part number* ThicknessPart number*
2.59 (0.1020)
2.61 (0.1028)
2.63 (0.1035)
2.65 (0.1043)
2.67 (0.1051)
2.69 (0.1059)
2.71 (0.1067)
2.73 (0.1075)
2.75 (0.1083)
2.77 (0.1091) 38154 40P00
38154 40P01
38154 40P02
38154 40P03
38154 40P04
38154 40P05
38154 40P06
38154 40P07
38154 40P08
38154 40P092.79 (0.1098)
2.81 (0.1106)
2.83 (0.1114)
2.85 (0.1122)
2.87 (0.1130)
2.89 (0.1138)
2.91 (0.1146)
2.93 (0.1154)
2.95 (0.1161)
2.97 (0.1169) 38154 40P10
38154 40P11
38154 40P12
38154 40P13
38154 40P14
38154 40P15
38154 40P16
38154 40P17
38154 40P18
38154 40P19
Thickness Part number* ThicknessPart number*
2.00 (0.0787)
2.05 (0.0807)
2.10 (0.0827)
2.15 (0.0846)
2.20 (0.0866)
2.25 (0.0886)
2.30 (0.0906) 38453 40P00
38453 40P01
38453 40P02
38453 40P03
38453 40P04
38453 40P05
38453 40P06
2.35 (0.0925)
2.40 (0.0945)
2.45 (0.0965)
2.50 (0.0984)
2.55 (0.1004)
2.60 (0.1024)
38453 40P07
38453 40P08
38453 40P09
38453 40P10
38453 40P11
38453 40P12

RSU-1
REAR SUSPENSION
E SUSPENSION
CONTENTS
C
DF
G H
I
J
K L
M
SECTION
A
B
RSU
Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 3
Precautions for Rear Suspension ....................... ..... 3
PREPARATION ...................................................... ..... 4
Commercial Service Tools ................................... ..... 4
NOISE, VIBRATION, AND HARSHNESS (NVH)
TROUBLESHOOTING ........................................... ..... 5
NVH Troubleshooting Chart ................................ ..... 5
CAN COMMUNICATION ....................................... ..... 6
System Description ............................................. ..... 6
TROUBLE DIAGNOSIS ......................................... ..... 7
How to Perform Trouble Diagnoses for Quick and
Accurate Repair .................................................. ..... 7
INTRODUCTION .............................................. ..... 7
CLARIFY CONCERN ....................................... ..... 7
WORK FLOW ........................................................ 8
Component Parts and Harness Connector Location ..... 9
Wiring Diagram — A/SUSP — ............................ ... 10
Basic Inspection .................................................. ... 12
AIR HOSES ...................................................... ... 12
POWER SYSTEM TERMINAL LOOSENESS
AND BATTERY INSPECTION ......................... ... 12
CK SUSP INDICATOR LAMP INSPECTION ... ... 12
CK SUSP Indicator Lamp Timing ........................ ... 12
Control Unit Input/Output Signal Standard .......... ... 12
CONSULT-II Function (AIR LEVELIZER) ............ ... 13
CONSULT-II OPERATION ............................... ... 13
SELF-DIAGNOSIS ........................................... ... 14
WORK SUPPORT ............................................ ... 15
DATA MONITOR .............................................. ... 16
ACTIVE TEST .................................................. ... 16
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
ITEMS .................................................................... ... 18
Height Sensor System Inspection ....................... ... 18
Exhaust Valve Solenoid System Inspection ........ ... 19
Compressor Motor, Compressor Motor Relay and
Circuit Inspection ................................................. ... 21
TROUBLE DIAGNOSES FOR SYMPTOMS ......... ... 24Load Leveling Rear Air Suspension System Does
Not Operate ............................................................ 24
CK SUSP Indicator Lamp Stays On When Ignition
Switch Is Turned On ............................................
... 25
REAR SUSPENSION ASSEMBLY ........................... 26 Components ........................................................ ... 26
On-Vehicle Inspection and Service ...................... ... 27
SHOCK ABSORBER INSPECTION ................. ... 27
Wheel Alignment Inspection ................................ ... 28
PRELIMINARY INSPECTION .......................... ... 28
GENERAL INFORMATION AND RECOMMEN-
DATIONS .......................................................... ... 28
THE ALIGNMENT PROCESS .......................... ... 29
CAMBER .......................................................... ... 29
TOE-IN ............................................................. ... 29
REAR SUSPENSION MEMBER ............................... 31 Removal and Installation ..................................... ... 31
REMOVAL ........................................................ ... 32
INSPECTION AFTER REMOVAL .................... ... 33
INSTALLATION ................................................ ... 34
SHOCK ABSORBER ............................................. ... 35
Removal and Installation ..................................... ... 35
REMOVAL ........................................................ ... 35
INSTALLATION ................................................ ... 35
INSPECTION AFTER INSTALLATION ............. ... 35
SUSPENSION ARM ............................................... ... 36
Removal and Installation ..................................... ... 36
REMOVAL ........................................................ ... 36
INSPECTION AFTER REMOVAL .................... ... 36
INSTALLATION ................................................ ... 37
FRONT LOWER LINK ........................................... ... 38
Removal and Installation ..................................... ... 38
REMOVAL ........................................................ ... 38
INSPECTION AFTER REMOVAL .................... ... 38
INSTALLATION ................................................ ... 39
REAR LOWER LINK & COIL SPRING .................. ... 40
Removal and Installation ..................................... ... 40
REMOVAL ........................................................ ... 40
INSPECTION AFTER REMOVAL .................... ... 41
INSTALLATION ................................................ ... 41

RSU-2Revision: November 20092006 QX56
STABILIZER BAR ..................................................
... 42
Removal and Installation ..................................... ... 42
REMOVAL ........................................................ ... 42
INSPECTION AFTER REMOVAL ..................... ... 42
INSTALLATION ................................................. ... 42
REAR LOAD LEVELING AIR SUSPENSION COM-
PRESSOR ASSEMBLY ............................................ 43 Removal and Installation ..................................... ... 43
REMOVAL ........................................................ ... 43
INSTALLATION ................................................. ... 44HEIGHT SENSOR ..................................................
... 45
Removal and Installation ...................................... ... 45
REMOVAL ......................................................... ... 45
INSTALLATION ................................................. ... 46
CONTROL UNIT ..................................................... ... 47
Removal and Installation ...................................... ... 47
REMOVAL ......................................................... ... 47
INSTALLATION ................................................. ... 47
Initialization Procedure ......................................... ... 47
SERVICE DATA AND SPECIFICATIONS (SDS) ... ... 48
Wheel Alignment .................................................. ... 48
Ball Joint .............................................................. ... 48
Wheelarch Height (Unladen*
1 ) ............................ ... 49