2011 INFINITI QX56 oil pump

ST-50
< REMOVAL AND INSTALLATION >
POWER STEERING OIL PUMP
Note the following, and install in the reverse order of removal.
 When installing suction hoses (1), refer to the figure.CAUTION:
 Never apply fluid to the hose (1) and tube (2).
 Insert hose securely until it contacts spool (A) of tube.
 Leave clearance (L) when installing clamp (3).
 When installing eye bolt (1) and copper washer (2) to oil pump (3), refer to the figure.
CAUTION:
 Never reuse copper washer.
 Apply power steering fluid to around copper washers, then
install eye bolt.
 Install eye bolt with eye join t (assembled to high pressure
hose) (B) protrusion (A) facing with pump side cutout, and
then tighten it to the specifi ed torque after tightening by
hand. Refer to ST-54, "
Exploded View".
 Securely insert harness connector to pressure sensor.
 About the installation of drive belt. Refer to EM-20,
"TensionAdjustment".
 Check fluid level, fluid leakage and air bleeding hydr aulic system after the installation. Refer to ST-30,
"Inspection".
Disassembly and AssemblyINFOID:0000000006225613
DISASSEMBLY
CAUTION:
 Fix oil pump with a vise if necessary.
 Use copper plates when fixing with a vise.
1. Perform inspection before disassembly. Refer to ST-52, "
Inspection".
2. Remove rear cover mounting bolts, and then remove rear cover from body assembly.
3. Remove gasket from body assembly.
4. Remove dowel pin, cartridge and side plate from body assembly.
5. Remove pulley mounting nut and washer, then remove pulley from drive shaft.
6. Remove snap ring from drive shaft and press out it. CAUTION:
When removing snap ring, be careful not to damage drive
shaft.
7. Remove oil seal from body assembly using a suitable tool.
8. Remove O-ring from body assembly.
9. Remove mounting bolts of suction pipe, and then remove suc- tion pipe and bracket from body assembly.
10. Remove connector bolt, and then remove O-ring, flow control
valve and spring from body assembly
11. Perform inspection after disassembly. Refer to ST-52, "
Inspec-
tion".
ASSEMBLY
CAUTION:
 Fix oil pump with a vise if necessary.
 Use copper plates when fixing with a vise.L : 3 – 8 mm (0.12 – 0.31 in)
JSGIA0118ZZ
JSGIA0452ZZ
SST010B
Revision: 2010 May2011 QX56

POWER STEERING OIL PUMPST-51
< REMOVAL AND INSTALLATION >
C
DE
F
H I
J
K L
M A
B
ST
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O P
1. Apply recommended grease to oil seal lips (1). Apply recom- mended fluid to around oil seal. Install oil seal to body assembly,
using a drift.
CAUTION:
Never reuse oil seal.
2. Apply recommended fluid to drive shaft, and press drive shaft into body assembly, then install snap ring.
CAUTION:
Never reuse snap ring.
3. Apply recommended fluid to O-ring, and then install O-ring into body assembly.
CAUTION:
Never reuse O-ring.
4. Install side plate to body assembly.
5. Install dowel pin (1) into dowel pin hole (A), and then install cam ring (2) pointing it's D
1 side toward the body assembly (3) side
as shown in the figure.
 When installing cam ring, turn carved face with a letter E (B) of
it to rear cover.
CAUTION:
Do not confuse the assembling direction of cam ring. If
cam ring is installed facing th e incorrect direction, it may
cause oil pump operation malfunction.
SGIA1150E
SGIA0422E
JSGIA0110ZZ
Revision: 2010 May2011 QX56

ST-52
< REMOVAL AND INSTALLATION >
POWER STEERING OIL PUMP
6. Install rotor to body assembly.CAUTION:
When installing rotor, turn mark face on rotor to body
assembly.
7. Install vane to rotor so that arc of vane faces cam ring side.
8. Check if drive shaft assembly turns smoothly.
9. Install gasket to body assembly. CAUTION:
Never reuse gasket.
10. Install rear cover to body assembly, and then tighten mounting bolts to the specified torque.
11. Install pulley and washer to drive shaft, and then tighten lock nut at the specified torque.
12. Apply recommended fluid to O-ring. Install flow control valve spring, flow control valve and O-ring to body assembly, and then
tighten connector bolt to the specified torque.
CAUTION:
Never reuse O-ring.
13. Apply recommended fluid to O-ring, and then install O-ring to body assembly. CAUTION:
Never reuse O-ring.
14. Install suction pipe and bracket to body assembly.
15. Perform inspection after assembly. Refer to ST-52, "
Inspection".
InspectionINFOID:0000000006225614
INSPECTION BEFORE DISASSEMBLY
Disassemble oil pump only when the following malfunctions occur.
 If oil leakage is found on oil pump.
 Oil pump pulley is damaged or deformed.
 Performance of oil pump is low.
INSPECTION AFTER DISASSEMBLY
Body Assembly and Rear Cover Inspection
Check body assembly and rear cover for internal damage. Replace oil pump assembly if necessary.
Cartridge Assembly Inspection
Check cam ring, rotor and vane for damage. Replace oil pump assembly if necessary.
Side Plate Inspection
Check side plate for damage. Replace oil pump assembly if necessary.
Flow Control Valve Inspection
Check flow control valve and spring for damage. Replace oil pump assembly if necessary.
INSPECTION AFTER ASSEMBLY
Relief Oil Pressure
CAUTION:
Make sure that belt tension is normal before starting the following procedure.
SGIA0989E
SST843A
Revision: 2010 May2011 QX56

POWER STEERING OIL PUMPST-53
< REMOVAL AND INSTALLATION >
C
DE
F
H I
J
K L
M A
B
ST
N
O P
1. Connect the oil pressure gauge [SST: KV48103500 (J-26357)] and the oil pressure gauge adapter [SST: KV48102500 (J-
33914)] between oil pump discharge connector and high-pres-
sure hose. Bleed air from the hydraulic circuit while opening
valve fully. Refer to ST-30, "
Inspection".
2. Start engine. Run engine until oil temperature reaches 50 to 80°C (122 to 176 °F).
CAUTION:
 Leave the valve of the oil pressure gauge fully open while
starting and running engine. If engine is started with the
valve closed, the hydraulic pressure in oil pump goes up
to the relief pressure along with unusual increase of oil
temperature.
 Be sure to keep hose clear of belts and other parts when engine is started.
3. Fully close the oil pressure gauge valve with engine at idle and measure the relief oil pressure.
CAUTION:
Never keep valve closed for 10 seconds or longer.
4. Open the valve slowly after measuring. Repair oil pump if the relief oil pressure is outside the standard. Refer to ST-50, "
Disassembly and Assembly".
5. Disconnect the oil pressure gauge from hydraulic circuit.
6. When installing eye bolt (1) and copper washer (2) to oil pump (3), refer to the figure.
CAUTION:
 Never reuse copper washers.
 Apply power steering fluid to around copper washer, theninstall eye bolt.
 Install eye bolt with eye join t (assembled to high pressure
hose) (B) protrusion (A) facing with pump side cutout, and
then tighten it to the specifi ed torque after tightening by
hand. Refer to ST-54, "
Exploded View".
 Securely insert harness connector to pressure sensor.
7. Check fluid level, fluid leakage and air bleeding hydraulic sys- tem after the installation. Refer to ST-30, "
Inspection".
Relief oil pressure : Refer to
ST-58, "
Relief Oil Pres-
sure".
SGIA1225E
JSGIA0452ZZ
Revision: 2010 May2011 QX56

ST-54
< REMOVAL AND INSTALLATION >
HYDRAULIC LINE
HYDRAULIC LINE
Exploded ViewINFOID:0000000006225615
Engine speed sensitive type
JPGIA0096GB
1. Reservoir tank bracket 2. Reservoir tank 3. Clamp
4. Suction hose 5. Return hose 6. Eye bolt
7. Copper washer 8. Pressure sensor 9. Oil cooler
10. High pressure piping 11. Low pressure piping 12. Steering gear assembly
A. To power steering oil pump suction hose.
B. To power steering oil pump.
Refer to GI-4, "
Components" for symbols in the figure.
Revision: 2010 May2011 QX56

HYDRAULIC LINEST-55
< REMOVAL AND INSTALLATION >
C
DE
F
H I
J
K L
M A
B
ST
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O P
Vehicle speed sensitive type
JPGIA0074GB
1. Reservoir tank bracket 2. Reservoir tank 3. Clamp
4. Suction hose 5. Return hose 6. Eye bolt
7. Copper washer 8. Pressure sensor 9. Oil cooler
10. High pressure piping 11. Low pressure piping 12. Steering gear assembly
A. To power steering oil pump suction hose.
B. To power steering oil pump.
Refer to GI-4, "
Components" for symbols in the figure.
Revision: 2010 May2011 QX56

STC-6
< SYSTEM DESCRIPTION >
SYSTEM
OPERATION PRINCIPLE
During Parking (When Turning The Steering Wheel To The Right.)
1. Power steering solenoid valve is closed while a vehicle is stopped.
2. Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
3. Oil pressure “P” in the gear housing assembly is the sum of oil pressures occurred in “2R” and “3R”. Thisresults in a light steering force because of high pressure.
During High-speed Operation
1. Power steering solenoid valve is opened during high-speed operation.
2. Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
3. Oil pressure “2R” does not occur because the pow er steering solenoid valve is on full throttle.
4. Oil pressure “P” in the gear housing assembly includes only oil pressure occurred in “3R” and results in a heavy steering force.
EPS SYSTEM : Fail-Safe INFOID:0000000006256120
EPS system
 EPS system enters the fail-safe mode (that allows the steering
force to be controlled without impairi ng the drivability) if any of the
input/output values to/from EPS system (power steering control
unit) deviate from the standard range.
 The power steering control unit controls the driving voltage to the
power steering solenoid valve for maintaining the power steering
assist force when the fail-safe function is activated. (The engine
speed signals control EPS system if any vehicle speed signal error
is detected.)
1. Combination meter 2. Power steering control unit 3. Power steering solenoid valve
4. Steering gear assembly 5. Gear housing assembly 6. Gear sub-assembly
7. Pinion 8. Power steering oil pump 9. Reservoir tank
JSGIA0020GB
JSGIA0021GB
JPGIB0022GB
Revision: 2010 May2011 QX56

TM-4
Component Inspection (Shift Lock Solenoid) ........159
SELECTOR LEVER POSITION INDICATOR ..161
Component Function Check ................................ ..161
Diagnosis Procedure .............................................161
Component Inspection (Selector Lever Position
Indicator) ................................................................
163
SYMPTOM DIAGNOSIS ............................165
SYSTEM SYMPTOM ...................................... .165
Symptom Table ................................................... ..165
PERIODIC MAINTENANCE ..................... ..175
A/T FLUID ....................................................... .175
Inspection ............................................................ ..175
REMOVAL AND INSTALLATION ..............176
A/T SHIFT SELECTOR ................................... .176
Exploded View ..................................................... ..176
Removal and Installation .......................................176
Inspection and Adjustment ....................................177
CONTROL CABLE ..........................................178
Exploded View ..................................................... ..178
Removal and Installation .......................................178
Inspection and Adjustment ....................................179
SELECTOR LEVER POSITION INDICATOR ..180
Removal and Installation ..................................... ..180
TOW MODE SWITCH ......................................181
Removal and Installation ..................................... ..181
CONTROL VALVE & TCM ..............................182
Exploded View ..................................................... ..182
Removal and Installation .......................................182
Inspection and Adjustment ....................................186
PARKING COMPONENTS ..............................187
2WD ........................................................................ ..187
2WD : Exploded View ............................................187
2WD : Removal and Installation ............................187
2WD : Inspection ...................................................190
REAR OIL SEAL ..............................................192
2WD ........................................................................ ..192
2WD : Exploded View ............................................192
2WD : Removal and Installation ............................192
2WD : Inspection ...................................................193
4WD ........................................................................ ..193
4WD : Exploded View ............................................193
4WD : Removal and Installation ............................193
4WD : Inspection and Adjustment .........................194
OUTPUT SPEED SENSOR .............................195
2WD ........................................................................ ..195
2WD : Exploded View ...........................................195
2WD : Removal and Installation ............................195
2WD : Inspection and Adjustment .........................198
AIR BREATHER HOSE ....................................199
2WD ........................................................................ .199
2WD : Exploded View ...........................................199
2WD : Removal and Installation ............................199
4WD ........................................................................ .200
4WD : Exploded View ...........................................200
4WD : Removal and Installation ............................200
FLUID COOLER SYSTEM ...............................202
Exploded View ..................................................... .202
Removal and Installation .......................................202
Inspection and Adjustment ....................................204
UNIT REMOVAL AND INSTALLATION ...205
TRANSMISSION ASSEMBLY ..........................205
2WD ........................................................................ .205
2WD : Exploded View ...........................................205
2WD : Removal and Installation ............................205
2WD : Inspection and Adjustment .........................207
4WD ........................................................................ .207
4WD : Exploded View ...........................................208
4WD : Removal and Installation ............................208
4WD : Inspection and Adjustment .........................210
UNIT DISASSEMBLY AND ASSEMBLY ..211
TRANSMISSION ASSEMBLY ..........................211
Exploded View ..................................................... .211
Oil Channel ...........................................................222
Location of Needle Bearings and Bearing Races .222
Location of Snap Rings .........................................225
Disassembly ..........................................................226
Assembly ..............................................................243
Inspection ..............................................................267
OIL PUMP, 2346 BRAKE, FRONT BRAKE
PISTON .............................................................
270
Exploded View ..................................................... .270
Disassembly ..........................................................270
Assembly ..............................................................274
Inspection and Adjustment ....................................277
UNDER DRIVE CARRIER, FRONT BRAKE
HUB ..................................................................
279
Exploded View ..................................................... .279
Disassembly ..........................................................279
Assembly ..............................................................280
Inspection ..............................................................280
FRONT CARRIER, INPUT CLUTCH, REAR
INTERNAL GEAR .............................................
282
Exploded View ..................................................... .282
Disassembly ..........................................................283
Revision: 2010 May2011 QX56