2001 INFINITI QX4 steering

DisassemblyNBST0034CAUTION:
IParts which can be disassembled are strictly limited.
Never disassemble parts other than those specified.
IDisassemble in as clean a place as possible.
IClean your hands before disassembly.
IDo not use rags; use nylon cloths or paper towels.
IFollow the procedures and cautions in the Service
Manual.
IWhen disassembling and reassembling, do not let foreign
matter enter or contact the parts.
1. Fix power steering pump to vise.
CAUTION:
When fixing the pump to vise, use an aluminum plate or such
to avoid damaging the fitting plane of the steering pump.
2. Remove the front bracket mounting bolt, and remove the front
bracket from the casing.
3. Remove the rear cover mounting bolt, and remove the rear
cover from the casing.
4. Remove the O-ring from the casing.
SST926C
5. Remove side plate (rear side) from cam ring, then remove side
plate inner/outer seals from side plate (rear side).
6. Remove rotor snap ring using snap ring pliers, and remove
pulley from casing.
CAUTION:
Do not damage pulley shaft when removing rotor snap ring.
SST928C
7. Remove the followings from casing.
ICam ring
IRotor
IVane
ISide plate (front side)
IFlow control A valve
IFlow control valve spring
IFlow control B valve assembly
CAUTION:
Be careful not to drop flow control valve.
8. Remove inlet connector mounting bolt, and remove inlet con-
nector from casing.
9. Remove inlet connector seal from inlet connector.
10. Remove drive shaft seal from casing with a screwdriver.
CAUTION:
Do not damage casing surface with the screwdriver.
POWER STEERING OIL PUMP
Disassembly
ST-28

InspectionNBST0035IIf pulley is cracked or deformed, replace it.
IIf an oil leak is found around pulley shaft oil seal, replace the
seal.
ICheck the casing and the inside of the rear body for damage.
If damages are found in the rear body, replace the entire rear
body. If the casing is damaged, replace the entire power steer-
ing pump as an assembly.
ICheck the cam ring for damage. If damage is found, replace
the cam ring, rotor and vane as a set.
ICheck the side plates (front and rear) for damage. If damage
is found, replace the side plates as a set (front and rear).
SST934C
AssemblyNBST00361. Apply grease to the lip of the drive shaft seal, and attach the
casing.
CAUTION:
The drive shaft seal cannot be reused. Always replace after
every disassembly.
SST928C
2. When removing the dowel pin, if it is difficult to insert with your
hands, insert into the casing by tapping lightly with a hammer
or similar tool.
3. Attach the flow control A valve, flow control valve spring, and
the flow control B valve assembly to the locations indicated in
the drawing left.
SST929C
4. Match the dowel pin A on the flow control A valve side with the
notch B of the side plate (front), and attach the side plate (front)
to the casing.
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POWER STEERING OIL PUMP
Inspection
ST-29

SST930C
5. Face the cam ring side with fewer pores towards the casing,
and attach the cam ring on top of the side plate (front).
6. Attach the pulley to the casing.
CAUTION:
Attach with care so as not to damage the drive shaft seal.
SST289A
7. Face the side of the rotor with the punch mark towards the
casing, and attach the rotor to the pulley shaft.
SST843A
8. Attach the vane to the rotor so that the vane's arc touches the
cam ring.
SST931C
9. Use a hammer or suitable tool to insert the rotor snap ring into
the pulley shaft channel.
CAUTION:
IThe rotor snap ring cannot be reused. Always replace after
every disassembly.
IInsert with care so as not to damage the rotor or the pul-
ley shaft.
IIf the rotor is damaged, replace the power steering as an
assembly.
SST932C
10. Match the dowel pin A on the flow control A valve side with the
notch B of the side plate (rear), and attach the side plate (rear)
to the cam ring.
11. Apply Genuine Nissan PSF II or equivalent to O-ring and
attach to the casing.
CAUTION:
The O-ring cannot be reused. Always replace after every dis-
assembly.
POWER STEERING OIL PUMP
Assembly (Cont'd)
ST-30

SST933C
12. Attach a side plate inner seal and side plate outer seal with
Genuine Nissan PSF II or equivalent applied, to the side plate
(rear).
CAUTION:
The side plate inner seal and outer seal cannot be reused.
Always replace after every disassembly.
13. Set the power steering pump on the vice.
CAUTION:
When securing to the vice, use an aluminum plate or other
material to protect the installation surface of the power steer-
ing pump from damage.
14. Attach the rear body to the casing, and secure the bolts (4
bolts) in a diagonal order to the specified torque.
15. Attach the front bracket to the casing, and secure the bolts (2
bolts) to the specified torque.
16. Attach the inlet collector seal to the grooves of the inlet
collector, and attach the inlet collector to the casing with
attachment bolts.
CAUTION:
The inlet collector seal cannot be reused. Always replace after
every disassembly.
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POWER STEERING OIL PUMP
Assembly (Cont'd)
ST-31

General SpecificationsNBST0037
Applied modelAll
Steering modelPower steering
Steering gear typePR32K
Steering overall gear ratio 17.2
Turns of steering wheel
(Lock to lock)3.09
Steering column type Collapsible, tilt
Steering WheelNBST0038Unit: mm (in)
Steering wheel axial play0 (0)
Steering wheel play35 (1.38) or less
Movement of gear housing±2(±0.08) or less
Steering ColumnNBST0039Unit: mm (in)
Steering column length ªL1º 716.7 - 718.7 (28.22 - 28.30)
Steering column lower shaft length ªL
2º 178 - 180 (7.01 - 7.09)
Steering column upper joint length ªL
3º 430.7 - 432.7 (16.96 - 17.04)
SST739C
Steering Transfer GearNBST0041
Rotating torque0.25 - 0.69 N´m (2.5 - 7.0 kg-cm, 2.2 - 6.1 in-lb)
SERVICE DATA AND SPECIFICATIONS (SDS)
General Specifications
ST-32

Steering Gear and LinkageNBST0040
Applied modelAll
Steering gear typePR32K
Tie-rod outer ball jointSwinging force at cotter pin hole: ªAº 4.9 - 47.1 N (0.5 - 4.8 kg, 1.1 - 10.6 lb)
Rotating torque: ªBº 0.3 - 2.9 N´m (3 - 30 kg-cm, 2.6 - 26.0 in-lb)
Axial end play: ªCº 0.1 mm (0.004 in) or less
Tie-rod inner ball jointSwinging force*: ªAº 3.9 - 32.4 N (0.4 - 3.3 kg, 0.9 - 7.3 lb)
Axial end play: ªCº 0.3 mm (0.012 in) or less
Tie-rod standard length ªLº200 mm (7.87 in)
Rack stroke ªSº72.0 mm (2.835 in)
Pinion gear preload without
gear fluidLock to lock
Average rotating torque0.78 - 1.47 N´m (8.0 - 15.0 kg-cm, 6.9 - 13.0 in-lb)
Within±100É from the neutral position
Maximum torque variation0.4 N´m (4 kg-cm, 3.5 in-lb)
Outside the above range
Maximum torque variation0.6 N´m (6 kg-cm, 5.2 in-lb)
*: Measuring point [: 240 mm (9.45 in)]
SST740C
Power SteeringNBST0042
Steering gear typePR32K
Rack sliding force
Under normal operating oil pressure137 - 255 N (14 - 26 kg, 31 - 57 lb)
Retainer adjustment
(Adjustment screw)Initial tightening torque 4.9 - 5.9 N´m (50 - 60 kg-cm, 43 - 52 in-lb)
Retightening torque after loosening 0.2 N´m (2 kg-cm, 1.7 in-lb)
Tightening torque after gear has settled 4.9 - 5.9 N´m (50 - 60 kg-cm, 43 - 52 in-lb)
Returning angle 10É - 20É
Steering wheel turning force
(Measured at one full turn from the neutral position)39 N (4 kg, 9 lb) or less
Fluid capacity (Approximate)0.9(1 US qt, 3/4 Imp qt)
Oil pump maximum pressure 8,630 - 9,219 kPa (88 - 94 kg/cm
2, 1,251 - 1,337 psi)
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SERVICE DATA AND SPECIFICATIONS (SDS)
Steering Gear and Linkage
ST-33

Noise, Vibration and Harshness (NVH)
Troubleshooting
=NBSU0035NVH TROUBLESHOOTING CHARTNBSU0035S01Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
Reference page
SU-4, 16
SU-8, 18
Ð
Ð
Ð
SU-8, 18
SU-6
SU-10, 20
SU-6
Ð
Ð
Ð
Ð
Ð
Ð
PD-3
PD-3
AX-3
AX-3
Refer to SUSPENSION
in this chart.
Refer to TIRES
in this chart.
Refer to ROAD WHEEL
in this chart.
BR-6
ST-6
Possible cause and
SUSPECTED
PA R T S
Improper installation, looseness
Shock absorber deformation,
damage or deflection
Bushing or mounting deterioration
Parts interference
Spring fatigue
Suspension looseness
Incorrect wheel alignment
Stabilizer bar fatigue
Out-of-round
Imbalance
Incorrect air pressure
Uneven tire wear
Deformation or damage
Non-uniformity
Incorrect tire size
PROPELLER SHAFT
DIFFERENTIAL
DRIVE SHAFT
AXLE
SUSPENSION
TIRES
ROAD WHEEL
BRAKES
STEERING Symptom
SUSPENSION
Noise´ ´ ´´´´ ´´´´ ´ ´ ´´
Shake´´´´´ ´´´ ´´´´
Vibration´ ´ ´´´ ´ ´´ ´ ´
Shimmy´´´´ ´ ´ ´ ´´´
Judder´´´ ´ ´ ´´´
Poor quality
ride or han-
dling´ ´ ´´´ ´´ ´ ´ ´
TIRES
Noise´ ´´´´´´ ´´´´ ´ ´ ´´
Shake´ ´´´´´ ´´ ´´ ´ ´ ´´
Vibration´´´´´´ ´
Shimmy´ ´´´´´´´ ´ ´ ´ ´´
Judder´ ´´´´´ ´ ´ ´ ´ ´´
Poor quality
ride or han-
dling´ ´´´´´ ´ ´ ´ ´
ROAD WHEEL
Noise´ ´´ ´ ´´´´ ´ ´ ´´
Shake´ ´´ ´ ´ ´´ ´ ´ ´´
Shimmy,
Judder´´´´´´´´´
Poor quality
ride or han-
dling´´´´´´´
´: Applicable
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FRONT SUSPENSION
Noise, Vibration and Harshness (NVH) Troubleshooting
SU-3

SFA975B
FRONT WHEEL ALIGNMENTNBSU0006Before checking front wheel alignment, be sure to make a prelimi-
nary inspection (Unladen*).
*: Fuel, radiator coolant and engine oil full. Spare tire, jack, hand
tools and mats in designated positions.
Preliminary InspectionNBSU0006S011. Check tires for wear and improper inflation.
2. Check wheels for deformation, cracks and other damage.
If deformed, remove wheel and check wheel runout.
NOTE:
Measure both the inner and outer sides for the radial runout and
lateral runout, and confirm the figures are within the standards.
Wheel runout (Dial indicator value):
Refer to SDS.
3. Check front wheel bearings for looseness.
4. Check front suspension for looseness.
5. Check steering linkage for looseness.
6. Check that front shock absorbers work properly.
7. Check vehicle posture (Unladen).
SFA894
Camber, Caster and Kingpin InclinationNBSU0006S02Camber, caster and kingpin inclination are preset at factory
and cannot be adjusted.
1. Measure camber, caster and kingpin inclination of both right
and left wheels with a suitable alignment gauge.
Camber, Caster and Kingpin inclination:
Refer to SDS, SU-13.
2. If camber, caster or kingpin inclination is not within
specification, inspect front suspension parts. Replace dam-
aged or worn out parts.
FRONT SUSPENSION
On-vehicle Service (Cont'd)
SU-6