INFINITI QX56 2011 Factory Service Manual

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-31
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REMOVAL AND INSTALLATION
HYDRAULIC BODY-MOT ION CONTROL SYSTEM
Hydraulic PipingINFOID:0000000006256020
FRONT TUBE ASSEMBLY
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-32
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
FRONT TUBE ASSEMBLY : Exploded View
INFOID:0000000006256021
FRONT TUBE ASSEMBLY : Removal and InstallationINFOID:0000000006256022
REMOVAL
Front Tube Assembly A (from Front Shock Absorber RH Upper to Front Shock Absorber LH Lower)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
1. Protector B 2. Bushing 3. Collar
4. Bleeder valve 5. Cap 6. O-ring
7. Front tube assembly A 8. Front tube assembly B 9. Protector A
A. To front shock absorber LH B. To front shock absorber RH
: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-33
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2. Disconnect lower side pipe (A) of front shock absorber LH.
3. Disconnect pipe (A) of accumulator assembly LH from left side 3-way (B).
4. Disconnect upper side pipe (A) of front shock absorber RH.
5. Remove protector A with power tool.
6. Remove mounting bolts of left side 3-way.
7. Remove protector B with power tool.
8. Remove mounting bolts of each bracket.
9. Remove front tube assembly A from the vehicle.
10. Perform inspection after removal. Refer to SCS-34, "
FRONT
TUBE ASSEMBLY : Inspection".
Front Tube Assembly B (from Front Shock Absorber LH Upper to Front Shock Absorber RH Lower)
1. Reduce system pressure. Refer to SCS-17, "Work Procedure".
2. Disconnect upper side pipe (B) of front shock absorber LH.
B : Upper side pipe
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B : Lower side pipe
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A : Lower side pipe
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Revision: 2010 May2011 QX56

SCS-34
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
3. Disconnect pipe (A) of accumulator assembly RH from right side
3-way (B).
4. Disconnect lower side pipe (B) of front shock absorber RH.
5. Remove protector A with power tool.
6. Remove mounting bolts of right side 3-way.
7. Remove protector B with power tool.
8. Remove mounting bolts of each bracket.
9. Remove front tube assembly B from the vehicle.
10. Perform inspection after removal. Refer to SCS-34, "
FRONT
TUBE ASSEMBLY : 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.
 Completely insert guide (A) to guide hole on frame when installing
left side 3-way.
 For tightening torque for pipe of accumulator assembly LH, refer to SCS-35, "
ACCUMULATOR : Exploded View".
 For tightening torque for pipe of accumulator assembly RH, refer to
SCS-35, "
ACCUMULATOR : Exploded View".
FRONT TUBE ASSEMBLY : InspectionINFOID:0000000006256023
INSPECTION AFTER REMOVAL
 O-ring must be free of scratches and damage.
 Pipe and tube must be free of scratches and damage.
INSPECTION AFTER INSTALLATION
Check oil leakage, twists, deformation, cont act with other parts, and loose connections.
ADJUSTMENT AFTER INSTALLATION
Perform air bleeding. Refer to SCS-18, "Work Procedure".
ACCUMULATOR
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A : Upper side pipe
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Revision: 2010 May2011 QX56

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-35
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ACCUMULATOR : Exploded ViewINFOID:0000000006256024
ACCUMULATOR : Removal and InstallationINFOID:0000000006256025
REMOVAL
Accumulator Assembly LH
WARNING:
1. O-ring 2. Accumulator assembly RH 3. Accumulator assembly LH :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

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
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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-38
< REMOVAL AND INSTALLATION >[HBMC]
HYDRAULIC BODY-MOTION CONTROL SYSTEM
 Completely engage hooks on frame when installing accumulator
assembly.
ACCUMULATOR : InspectionINFOID:0000000006256026
INSPECTION AFTER REMOVAL
 O-ring must be free of scratches and damage.
 Pipe and tube must be free of scratches and damage.
INSPECTION AFTER INSTALLATION
Check oil leakage, twists, deformation, cont act with other parts, and loose connections.
ADJUSTMENT AFTER INSTALLATION
Perform air bleeding. Refer to SCS-18, "Work Procedure".
ACCUMULATOR : DisposalINFOID:0000000006256027
CAUTION:
 Always wear safety goggles.
 Always wear safety gloves.
 Be careful since pressure is higher when temperature is high.
 Be careful since metal shavings or oi l may be blown away by compressed gas.
 Discard drained oil in accordance with local laws and regulations.
WORK PROCEDURE
1. Remove both tanks using an oil filter wrench.
2. Secure tank using a vise.
3. Drill a hole as shown in the figure ( z) using an electric drill.
Drain gas and oil.
NOTE:
 Gas is colorless, odorless, and harmless.
 Use an electric drill with a drill bit of approximately 4 mm (0.16 in).
 Drilling a hole is easier when electric drill speed is slow.
PPMU, MIDDLE TUBE AS SEMBLY, PPMU PIPE
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Revision: 2010 May2011 QX56

HYDRAULIC BODY-MOTION CONTROL SYSTEMSCS-39
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PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE : Exploded ViewINFOID:0000000006256028
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE : Removal and Installation
INFOID:0000000006256029
REMOVAL
PPMU
1. PPMU pipe B 2. Cap 3. Middle tube assembly RH
4. O-ring 5. Bleeder valve 6. Middle tube assembly LH
7. PPMU 8. Cap 9. Protector
10. PPMU pipe A
A. To rear shock absorber RH B. To rear shock absorber LH
:Vehicle front
:Apply genuine NISSAN hydraulic
suspension fluid
Refer to GI-4, "
Components" for symbols not described on the above.
JSEIA0231GB
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