2011 INFINITI QX56 power steering fluid

STEERING GEAR AND LINKAGEST-43
< REMOVAL AND INSTALLATION >
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4. Remove cotter pin (1), and then loosen the nut.
5. Remove steering outer socket (2) from steering knuckle (3) so as not to damage ball joint boot (4) using suitable ball joint
remover (commercial service tool).
CAUTION:
Temporarily tighten the nut to prevent damage to threads
and to prevent the ball joint remover from suddenly coming
off.
6. Remove high pressure piping and low pressure piping of hydraulic piping, and then drain power steering fluid.
7. Remove power steering solenoid valve harness connector.
8. Remove lower joint fixing bolt (steering gear side).
9. Separate the lower joint from the steering gear assembly. Refer to ST-37, "
Exploded View".
CAUTION:
 When removing lower joint, n ever insert a tool, such as a screw driver, into the yoke groove to
pull out the lower joint. In case of the violation of the above, replace lower joint with a new one.
 Spiral cable may be cut if steering wheel tu rns while separating steering column assembly and
steering gear assembly. Be sure to secure st eering wheel using string to avoid turning.
10. Remove steering gear assembly.
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
Spiral cable may be cut if steering wheel turns while separating steering column assembly and steer-
ing gear assembly. Be sure to secure steer ing wheel using string to avoid turning.
 When installing lower joint to steering gear assembly, follow the procedure listed below.
- Set rack of steering gear in the neutral position.
NOTE:
To get the neutral position of rack, turn gear-sub a ssembly and measure the distance of inner socket, and
then measure the intermediat e position of the distance.
- Align rear cover cap projection (A) with the marking position of gear housing assembly (B).
- Install slit part of lower joint (C) aligning with the rear cover cap projection (A). Make sure that the slit part of lower joint (C) is
aligned with rear cover cap projection (A) and the marking position
of gear housing assembly (B).
 Never reuse cotter pin and steering gear mounting nut.
 Perform inspection after installation. Refer to ST-46, "
Inspection".
Disassembly and AssemblyINFOID:0000000006225609
DISASSEMBLY
CAUTION:
 Disassemble and assemble steering gear assembly by fixing the mounting area with a vise using
copper plates.
 Clean steering gear assembly with kerosene before disassembling. Be careful to avoid splashing or
applying any kerosene over connector of discharge port or return port.
1. Remove cylinder tubes from gear housing assembly.
2. Remove rear cover cap from gear-sub assembly.
PGIA0063E
: Bolt
JPGIA0038ZZ
Revision: 2010 May2011 QX56

POWER STEERING OIL PUMPST-49
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Removal and InstallationINFOID:0000000006225612
REMOVAL
1. Drain power steering fluid from reservoir tank. CAUTION:
 Never reuse drained power steering fluid.
 Always use the specified fluid. Refer to MA-10, "
Fluids and Lubricants".
2. Remove the reservoir tank. Refer to CO-13, "
Removal and Installation".
3. Remove the battery and battery tray from vehicle. Refer to PG-164, "
Removal and Installation".
4. Loosen drive belt. Refer to EM-20, "
Removal and Installation".
5. Remove drive belt from oil pump pulley.
6. Remove copper washers and eye bolt (drain fluid from their pipings).
7. Remove suction hose (drain fluid from their pipings).
8. Remove oil pump mounting bolts, and then remove oil pump.
INSTALLATION
1. Pulley 2. Snap ring 3. Drive shaft assembly
4. Oil seal 5. Body assembly 6. Suction pipe
7. O-ring 8. Side plate 9. Vane
10. Rotor 11. Cam ring 12. Cartridge
13. Dowel pin 14. Gasket 15. Rear cover
16. Flow control valve spring 17. Flow control valve 18. Connector bolt
19. Bracket
: Replace the parts as a set.
A. Oil seal lip
: Apply power steering fluid.: Apply multi-purpose grease.
Refer to GI-4, "
Components" for symbols not described on the above.
JPGIA0032GB
Revision: 2010 May2011 QX56

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
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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
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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

DIAGNOSIS AND REPAIR WORK FLOWSTC-13
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
Work FlowINFOID:0000000006256124
DETAILED FLOW
1.COLLECT THE INFORMATION FROM THE CUSTOMER
It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms and
understand them fully. Ask customer about his/her complaints carefully. In some cases, it is necessary to
check symptoms by driving vehicle with customer.
CAUTION:
Customers are not professional. It is danger ous to make an easy guess like “maybe the customer
means that...,” or “maybe the cu stomer mentions this symptom”.
>> GO TO 2.
2.CHECK THE STATUS
1. Power steering fluid leakage and check the power steering fluid level. Refer to ST-30, "
Inspection".
2. Check the drive belt tension. Refer to EM-20, "
Checking".
3. Check the power steering gear for damages, cracks and fluid leakage. Refer to ST-46, "
Inspection".
4. Check the relief oil pressure. Refer to ST-52, "
Inspection".
>> GO TO 3.
3.DIAGNOSIS CHART BY SYMPTOM
Perform the diagnosis by symptom. Refer to STC-22, "
Diagnosis Procedure".
>> GO TO 4.
4.FINAL CHECK
Check the input/output standard values for the power steering control unit.
Are the power steering control unit input/output values within standard ranges respectively?
YES >> INSPECTION END
NO >> GO TO 2.
Revision: 2010 May2011 QX56