2006 INFINITI QX56 REAR SUSPENSION

RSU-34
REAR SUSPENSION MEMBER
Revision: November 20092006 QX56
INSTALLATION
Installation is in the reverse order of removal.

When raising the rear suspension member assembly, use the
locating pins to align the rear suspension member to the vehicle
body.

When installing the upper and lower rubber seats for the rear
coil springs, the arrow embossed on the rubber seats must point
out toward the wheel and tire assembly.

To connect the rear load leveling air suspension hoses, the lock
ring must be fully seated in the fitting. Insert the hose “B” into the
lock ring “A” until the lock ring “A” is touching the hose “B” as
shown. Pull on the hose to check that it is securely inserted.

Perform the final tightening of the nuts and bolts for the links (rubber bushing) under unladen condition
(unladen condition means that the fuel tank, engine coolant and lubricants are at the full specification, and
the spare tire, jack, hand tools, and mats are in their designated positions) with the tires on level ground.

Check the wheel alignment. Refer to RSU-48, "Wheel Alignment" .
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LEIA0076E
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SHOCK ABSORBERRSU-35
C
DF
G H
I
J
K L
M A
B
RSU
Revision: November 2009 2006 QX56
SHOCK ABSORBERPFP:56210
Removal and Installation EES001HJ
REMOVAL
1. Remove the wheel and tire assembly using power tool. Refer to WT-7, "Rotation" .
2. Use CONSULT-II “EXHAUST SOLENOID ” active test to release the air pressure from the rear load level-
ing air suspension system.
3. Remove the four clips and remove the rear fender protector, front.
4. Disconnect the rear load leveling air suspension hose from the shock absorber.

To disconnect the hose, push in on the lock ring using a suit-
able tool and pull the air hose out.
5. Remove the shock absorber upper and lower end bolts using power tool.
6. Remove the shock absorber.
CAUTION:
Do not damage the rubber boot on the shock absorber.
INSTALLATION
Installation is in the reverse order of removal.

Tighten the shock absorber bolts to specification. Refer to RSU-26, "Components" .
INSPECTION AFTER INSTALLATION

Check the shock absorber for any air leaks or damage to the rubber boot.

Check the shock absorber for smooth operation through a full stroke, both compression and extension.

Check piston rod for cracks, deformation or other damage and replace if necessary.
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LEIA0082E

RSU-36
SUSPENSION ARM
Revision: November 20092006 QX56
SUSPENSION ARMPFP:55501
Removal and Installation EES001HK
REMOVAL
1. Remove the rear suspension member assembly using power tool. Refer to RSU-31, "Removal and Instal-
lation" .
NOTE:
It is necessary to remove the rear suspension member to remove the front upper bolt from the suspension
arm.
2. Remove the shock absorber upper end bolt.
3. Remove the suspension arm upper nuts and bolts on the sus- pension member side using power tool.
4. Remove the suspension arm pinch bolt and nut on the knuckle side using power tool.
5. Disconnect the suspension arm from the knuckle using a soft hammer.
CAUTION:
Do not damage the ball joint with the soft hammer.
6. Remove the suspension arm.
INSPECTION AFTER REMOVAL

Check the suspension arm for damage, cracks, deformation and replace if necessary.

Check the rubber bushing for damage, cracks and deformation. Replace suspension arm assembly if nec-
essary.

Before checking, turn the ball joint at least 10 revolutions so that the ball joint is properly broken in.
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LEIA0087E

RSU-38
FRONT LOWER LINK
Revision: November 20092006 QX56
FRONT LOWER LINKPFP:55110
Removal and InstallationEES001HL
REMOVAL
1. Remove the wheel and tire assembly using power tool.
2. Use CONSULT-II "EXHAUST SOLENOID" active test to release the air pressure from the rear load level-
ing air suspension system.
3. Remove the shock absorber lower end bolt.
4. Remove the adjusting bolt and nut, and the bolt and nut, from the front lower link and rear suspension member using power
tool.
5. Remove the front lower link pinch bolt and nut on the knuckle side using power tool.
6. Disconnect the front lower link from the knuckle using a soft hammer.
CAUTION:
Do not damage the ball joint with the soft hammer.
7. Remove the front lower link.
INSPECTION AFTER REMOVAL

Check the front lower link and bushing for any deformation, crack, or damage. Replace if necessary.

Check the rubber bushing for damage, cracks and deformation. Replace the front lower link and bushing if
necessary.

Before checking, turn the ball joint at least 10 revolutions so that the ball joint is properly broken in.

Check the ball joint. Replace the front lower link if any of the fol-
lowing conditions exist:
–Ball stud is worn.
–Joint is hard to swing.
–Play in axial direction is excessive.
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LEIA0086E
Swinging force “A” : Refer to RSU-48, "Ball Joint" .
Turning force “B” : Refer to RSU-48, "
Ball Joint" .
Vertical end play “C” : Refer to RSU-48, "
Ball Joint" .
SFA858A

RSU-40
REAR LOWER LINK & COIL SPRING
Revision: November 20092006 QX56
REAR LOWER LINK & COIL SPRINGPFP:551B0
Removal and Installation EES001HM
REMOVAL
1. Remove the wheel and tire assembly using power tool. Refer to WT-7, "Rotation" .
2. Use CONSULT-II "EXHAUST SOLENOID" active test to release the air pressure from the rear load level- ing air suspension system.
3. For removing the LH rear lower link and coil spring, remove the height sensor arm bracket bolt from the LH rear lower link.
4. Set a suitable jack to relieve the coil spring tension from the rear lower link.
WARNING:
Do not compress the coil spring when setting the jack.
5. Loosen the rear lower link adjusting bolt and nut connected to the rear suspension member, using power tool.
6. Remove the rear lower link bolt and nut from the knuckle using power tool.
7. Slowly lower the suitable jack to release the coil spring tension. Then remove the upper rubber seat, coil spring, and lower rubber seat from the rear lower link.
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REAR LOWER LINK & COIL SPRINGRSU-41
C
DF
G H
I
J
K L
M A
B
RSU
Revision: November 2009 2006 QX56
8. Remove the rear lower link adjusting bolt and nut from the rear
suspension member using power tool, then remove the rear
lower link.
INSPECTION AFTER REMOVAL
Check the coil spring and rubber seats for deformation, cracks, or other damage and replace if necessary.
INSTALLATION
Installation is in the reverse order of removal.

Tighten the nuts and bolts to specification. Refer to RSU-26, "Components" .

When installing the upper and lower rubber seats for the rear
coil springs, the arrow embossed on the rubber seats must point
out toward the wheel and tire assembly.

After installing the rear lower link and coil spring, check the
wheel alignment and adjust if necessary. Refer to RSU-28,
"Wheel Alignment Inspection" .
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LEIA0076E

REAR LOAD LEVELING AIR SUSPENSION COMPRESSOR ASSEMBLYRSU-43
C
DF
G H
I
J
K L
M A
B
RSU
Revision: November 2009 2006 QX56
REAR LOAD LEVELING AIR SUSPENSION COMPRESSOR ASSEMBLYPFP:53400
Removal and InstallationEES001HP
Rear Load Leveling Air Suspension System
REMOVAL
1. Use CONSULT-II "EXHAUST SOLENOID" active test to release the air pressure from the rear load level-
ing air suspension system.
2. Disconnect the electrical connectors for the rear load leveling air suspension compressor assembly.
3. Unclip the rubber cover to access the rear load leveling air suspension compressor assembly.
4. Disconnect the rear load leveling air suspension hoses at the rear load leveling air suspension compressor assembly.

To disconnect the hoses, push in on the lock ring using a suit-
able tool and pull the hose out.
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1. Rear load leveling air suspension
hose, RH 2. Shock absorber, RH 3. Height sensor
4. Rear load leveling air suspension hose, LH 5. Shock absorber, LH 6. Rear load leveling air suspension
compressor assembly
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RSU-44
REAR LOAD LEVELING AIR SUSPENSION COMPRESSOR ASSEMBLY
Revision: November 20092006 QX56
5. Remove the four bolts that mount the rear load leveling air sus-
pension compressor assembly to the underbody.
INSTALLATION
Installation is in the reverse order of removal.

To connect the rear load leveling air suspension hoses, the lock
ring must be fully seated in the fitting. Insert the hose “B” into the
lock ring “A” until the lock ring “A” is touching the hose “B” as
shown. Pull on the hose to check that it is securely inserted.
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LEIA0078E