2011 INFINITI QX56 body int

STRUCTURE AND OPERATIONSCS-9
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STRUCTURE AND OPERATION
Hydraulic Body-Moti on Control SystemINFOID:0000000006256001
Shock AbsorberINFOID:0000000006256002
The use of accumulator-generated pressure responsive to driving conditions or pressure generated by oil flow
to the upper/lower chamber improves the steering stabili ty at curving, in addition to the running performance
and a ride quality during off-road travel.
FRONT SIDE
Oil enters from oil inlet outlet hole (A) and flows into lower chamber (3) via outside oil path of cylinder inside.
Oil enters from oil inlet outlet hole (B) and flows into upper chamber (1). With the pressure difference between
oil flowed into the upper chamber and lower chamber, the piston (2) moves up and down and conveys a force
generated through this motion to the tires.
1. Middle tube assembly RH 2. Accumulator assembly RH 3. Front tube assembly A
4. Front tube assembly B 5. Accumulator assembly LH 6. PPMU pipe A
7. PPMU assembly 8. Middle tube assembly LH 9. PPMU pipe B
10. Rear tube assembly A 11. Rear tube assembly B
:Vehicle front
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Revision: 2010 May2011 QX56

SCS-36
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
Never remove mounting bolts of protector.
1. Reduce system pressure. Refer to
SCS-17, "
Work Procedure".
2. Disconnect pipe (A) of accumulator assembly LH from left side 3-way (B).
3. Disconnect pipe (A) of accumulator assembly LH from left side middle joint (B).
4. Separate chassis and body. Refer to DLK-251, "
Removal and
Installation".
5. Remove mounting bolts of each bracket.
6. Remove mounting bolts of accumulator assembly LH. WARNING:
Never remove mounting bolts of protector.
7. Remove accumulator assembly LH from the vehicle.
8. Perform inspection after removal. Refer to SCS-38, "
ACCUMU-
LATOR : Inspection".
Accumulator Assembly RH
WARNING:
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Revision: 2010 May2011 QX56

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-37
< REMOVAL AND INSTALLATION > [HBMC]
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Never remove mounting bolts of protector.
1. Reduce system pressure. Refer to SCS-17, "
Work Procedure".
2. Disconnect pipe (A) of accumulator assembly RH from right side 3-way (B).
3. Remove pipe (A) of accumulator assembly RH from right side middle joint (B).
4. Separate chassis and body. Refer to DLK-251, "
Removal and
Installation".
5. Remove mounting bolts of each bracket.
6. Remove mounting bolts of accumulator assembly RH. WARNING:
Never remove mounting bolts of protector.
7. Remove accumulator assembly RH from the vehicle.
8. Perform inspection after removal. Refer to SCS-38, "
ACCUMU-
LATOR : Inspection".
INSTALLATION
Note the following, and install in the reverse order of removal.
 Apply genuine NISSAN hydraulic suspension fluid to O-ring.
 Check connection portion of each piping for dirt or dust.
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Revision: 2010 May2011 QX56

SCS-40
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
1. Reduce system pressure. Refer to
SCS-17, "Work Procedure".
2. Remove protector.
3. Disconnect PPMU pipe A and PPMU pipe B from PPMU.
4. Remove mounting bolts of PPMU.
5. Remove PPMU from the vehicle.
6. Perform inspection after removal. Refer to SCS-43, "
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE :
Inspection".
Middle Tube Assembly LH (from Rear Shock Absorber LH Upper to Left Side Middle Joint)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Remove PPMU.
3. Disconnect upper side pipe (A) of rear shock absorber LH.
4. Disconnect pipe (A) of rear tube assembly B from left side rear joint (B).
5. Disconnect pipe (A) of accumulator assembly LH from left side middle joint (B).
6. Disconnect PPMU pipe A (A) from left side middle joint (B).
7. Separate chassis and body. Refer to DLK-251, "
Removal and
Installation".
8. Remove mounting bolts of each bracket.
9. Remove middle tube assembly LH from the vehicle.
10. Perform inspection after removal. Refer to SCS-43, "
PPMU,
MIDDLE TUBE ASSEMBLY, PPMU PIPE : Inspection".
B : Lower side pipe
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Revision: 2010 May2011 QX56

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-41
< REMOVAL AND INSTALLATION > [HBMC]
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Middle Tube Assembly RH (from
Rear Shock Absorber RH Upper to Right Side Middle Joint)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Disconnect upper side pipe (A) of rear shock absorber RH.
3. Disconnect pipe (A) of rear tube assembly A from right side rear joint (B).
4. Remove pipe (A) of accumulator assembly RH from right side middle joint (B).
5. Disconnect PPMU pipe B (A) from right side middle joint (B).
6. Separate chassis and body. Refer to DLK-251, "
Removal and
Installation".
7. Remove mounting bolts of each bracket.
8. Remove middle tube assembly RH from the vehicle.
9. Perform inspection after removal. Refer to SCS-43, "
PPMU,
MIDDLE TUBE ASSEMBLY, PPMU PIPE : Inspection".
PPMU pipe A and PPMU pipe B
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Remove PPMU pipe A from left side middle joint.
3. Remove PPMU pipe B from right side middle joint.
4. Separate chassis and body. Refer to DLK-251, "
Removal and Installation".
5. Remove PPMU pipe B from the vehicle.
6. Perform inspection after removal. Refer to SCS-43, "
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE :
Inspection".
B : Lower side pipe
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Revision: 2010 May2011 QX56

SCS-42
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
INSTALLATION
PPMU
Note the following, and install in the reverse order of removal.
 Check connection portion of each piping for dirt or dust.
 Completely engage hooks of bracket on frame when installing
PPMU.
Middle Tube Assembly LH (from Rear Shock Absorber LH Upper to Left Side Middle Joint)
Note the following, and install in the reverse order of removal.
 Apply genuine NISSAN hydraulic suspension fluid to O-ring.
 Check connection portion of each piping for dirt or dust.
 For tightening torque for pipe of rear tube assembly B, refer to SCS-44, "
REAR TUBE ASSEMBLY :
Exploded View".
 For tightening torque for pipe of accumulator assembly LH, refer to SCS-35, "
ACCUMULATOR : Exploded
View".
 Completely insert guide (A) to guide hole on frame when installing left side middle joint.
Middle Tube Assembly RH (fro m Rear Shock Absorber RH Upper to Right Side Middle Joint)
 O-ring must be free of scratches and damage.
 Apply genuine NISSAN hydraulic suspension fluid to O-ring.
 Check connection portion of each piping for dirt or dust.
 For tightening torque for pipe of rear tube assembly A refer to SCS-44, "
REAR TUBE ASSEMBLY :
Exploded View".
 For tightening torque for pipe of accumulator assembly RH, refer to SCS-35, "
ACCUMULATOR : Exploded
View".
 Completely insert guide (A) to guide hole on frame when installing right side middle joint.
PPMU pipe A and PPMU pipe B
Install in the reverse order of removal.
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Revision: 2010 May2011 QX56

SCS-44
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
REAR TUBE ASSEMBLY : Exploded View
INFOID:0000000006256032
REAR TUBE ASSEMBLY : Removal and InstallationINFOID:0000000006256033
REMOVAL
Rear Tube Assembly A (from Rear Shock Abso rber LH Lower to Right Side Rear Joint)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Remove rear muffler. Refer to EX-5, "
Removal and Installation".
1. Rear tube assembly A 2. O-ring 3. Rear tube assembly B
:Vehicle front
:Apply genuine NISSAN hydraulic
suspension fluid
Refer to GI-4, "
Components" for symbols not described on the above.
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Revision: 2010 May2011 QX56

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-45
< REMOVAL AND INSTALLATION > [HBMC]
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3. Remove lower side pipe (A) of rear shock absorber LH.
4. Remove pipe (A) from left side rear joint (B).
5. Remove lower side pipe (A) of rear shock absorber RH.
6. Remove pipe (A) from right side rear joint (B).
7. Remove mounting bolts of bracket of rear tube assembly A and B.
8. Remove rear tube assembly A from the vehicle.
9. Perform inspection after removal. Refer to SCS-46, "
REAR
TUBE ASSEMBLY : Inspection".
Rear Tube Assembly B (from Rear Shock Absorber RH Lower to Left Side Rear Joint)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Remove rear muffler. Refer to EX-5, "
Removal and Installation".
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Revision: 2010 May2011 QX56