Bleed INFINITI QX4 2001 Factory Owner's Manual

6. If rack sliding force is not within specification, overhaul steer-
ing gear assembly.
7. If rack sliding force is OK, inspect steering column. Refer to
ªInspectionº, ªSTEERING WHEEL AND STEERING
COLUMNº, ST-14.
SST834-F
Checking Hydraulic SystemNBST0015Before starting, check belt tension, driving pulley and tire pressure.
1. Set Tool. Open shut-off valve. Then bleed air.
Refer to ªBleeding Hydraulic Systemº, ST-9.
2. Run engine, at idle speed or 1,000 rpm.
Make sure fluid temperature in reservoir tank rises to 60 to
80ÉC (140 to 176ÉF).
WARNING:
Warm up engine with shut-off valve fully opened. If engine is
started with shut-off valve closed, fluid pressure in the power
steering pump increase to maximum. This will raise fluid tem-
perature abnormally.
3. Check pressure with steering wheel fully turned to left and right
positions with engine idling at 1,000 rpm.
CAUTION:
Do not hold the steering wheel in a locked position for more
than 15 seconds.
Power steering pump maximum operating pressure:
8,630 - 9,219 kPa
(88 - 94 kg/cm
2, 1,251 - 1,337 psi)
IIf pressure reaches maximum operating pressure, system is
OK.
IIf pressure increases above maximum operating pressure,
check power steering pump flow control valve. Refer to ST-28.
4. If power steering pressure is below the maximum operating
pressure, slowly close shut-off valve and check pressure
again.
CAUTION:
Do not close shut-off valve for more than 15 seconds.
IIf pressure increases to maximum operating pressure, gear
should be damaged. Refer to ªRemoval and Installationº,
ST-18.
IIf pressure remains below maximum operating pressure, pump
should be damaged. Refer to ªDisassemblyº, ST-28.
5. After checking hydraulic system, remove Tool and add fluid as
necessary. Then completely bleed air out of system. Refer to
ST-9.
ON-VEHICLE SERVICE
Checking Steering Wheel Turning Force (Cont'd)
ST-10

SST718CA
6. Move rack over its entire stroke several times.
7. Measure pinion rotating torque within the range of 180É from
neutral position.
Stop the gear at the point of maximum torque.
8. Loosen adjusting screw, then retighten it to 4.9 to 5.9 N´m (50
to 60 kg-cm, 43 to 52 in-lb).
9. Loosen adjusting screw by 10É to 20É.
SST940C
10. Prevent adjusting screw from turning, and tighten lock nut to
specified torque.
SST718CA
11. Measure pinion rotating torque.
Lock to lock:
Average rotating torque
0.78 - 1.47 N´m (8.0 - 15.0 kg-cm, 6.9 - 13.0 in-lb)
Within±100É from the neutral position:
Maximum torque variation
0.4 N´m (4 kg-cm, 3.5 in-lb)
Outside the above range:
Maximum force variation
0.6 N´m (6 kg-cm, 5.2 in-lb)
IIf pinion rotating torque is not within specifications, readjust it
starting from step 4. If pinion rotating torque is still out of
specifications after readjustment, replace steering gear
assembly.
SST090B
12. Check rack sliding force on vehicle as follows:
a. Install steering gear onto vehicle, but do not connect tie-rod to
knuckle arm.
b. Connect all piping and fill with steering fluid.
c. Start engine and bleed air completely.
d. Disconnect steering column lower joint from the gear.
e. Keep engine at idle and make sure steering fluid has reached
normal operating temperature.
f. Pull tie-rod slowly to move it from neutral position to±11.5 mm
(±0.453 in) at speed of 3.5 mm (0.138 in)/s. Check that rack
sliding force is within specification.
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POWER STEERING GEAR AND LINKAGE
Adjustment (Cont'd)
ST-25

SMT811D
55. Thrust needle bearing race
56. Clutch piston
57. D-ring
58. Lip seal
59. Oil gutter
60. Center case
61. Stem bleeder
62. Mainshaft rear bearing
63. Thrust washer
64. Speedometer drive gear
65. Snap ring
66. Rear case
67. ATP switch
68. Neutral-4LO switch69. Oil seal
70. Magnet
71. Baffle plate
72. Oil strainer
73. O-ring
74. Control valve assembly
75. Lip seal (7 pieces)
76. Filler plug
77. Inner gear
78. Outer gear
79. Oil pump housing
80. Bushing
81. Oil pump shaft
82. Oil pressure check plug83. Oil pump gasket
84. Sub-oil pump housing
85. Outer gear
86. Inner gear
87. O-ring
88. Sub-oil pump cover
89. O-ring
90. Transfer motor
91. O-ring
92. Oil filter stud
93. O-ring
94. O-ring
95. Oil filter
OVERHAUL
Transfer Components (Cont'd)
TF-122

SMT877C
Rear Case
DISASSEMBLYNBTF00771. Remove neutral-4LO switch and ATP switch.
2. Remove bolts.
SMT878C
3. Remove rear case from center case by tapping it lightly with a
plastic hammer.
SMT883C
Center Case
DISASSEMBLYNBTF00781. Remove oil pump shaft from main oil pump.
SMT884C
2. Remove stem bleeder from bleeder hole.
SMT844DB
3. Remove lock nut from companion flange.
IDo not reuse lock nut.
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DISASSEMBLY
Rear Case
TF-123

SMT894C
4. Make sure the two claws of oil gutter are securely attached to
slots in center case.
SMT895C
5. With the claws of oil gutter held by a finger, install center case
assembly to front case assembly.
CAUTION:
Pay careful attention so that mainshaft end does not damage
radial needle bearing in sun gear assembly.
6. Tap center case lightly with a rubber hammer or the like and
press-fit front drive shaft bearing into front case.
SMT896C
7. Make sure oil gutter rear end protrudes from point ªAº in the
figure.
8. Tighten bolts to specified torque.
: 41 - 48 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
IBe sure to install air breather hose clamp, connector
bracket and harness clip.
SMT883C
9. Fit double-flat end of oil pump shaft into slot of main oil pump
and install it.
NOTE:
When oil pump shaft is rotated slightly, it drops into position where
both parts fit.
SMT884C
10. Install stem bleeder to center case.
ASSEMBLY
Final Assembly (Cont'd)
TF-154

SMT881C
11. Remove rear oil seal.
IDo not reuse oil seal.
SMT882C
12. Apply ATF to the circumference of new rear oil seal, and tap it
using a drift as shown in the figure so that it is aligned with
case tip face.
IApply multi-purpose grease to oil seal lip.
SMT879C
13. Apply sealing fluid 518 (Locktite) to entire rear case mounting
surface of center case as shown in the figure.
CAUTION:
IRemove all foreign materials such as water, oil, and
grease from center case and rear case mating surfaces.
IBe careful not to allow sealing fluid to clog bleeder hole.
14. Install rear case to center case, and tighten bolts to specified
torque.
: 41 - 48 N´m (4.2 - 4.9 kg-m, 30 - 35 ft-lb)
IBe sure to attach harness clips.
SMT880C
15. Remove all the gasket fluid 1215 (Three Bond) from switch
mounting area and inside rear case, with ATP switch and neu-
tral-4LO switch threaded in 1 to 2 pitches, apply gasket fluid
1215 (Three Bond) to the thread of the switches and tighten it
to specified torque.
: 15 - 20 N´m (1.5 - 2.0 kg-m, 11 - 14 ft-lb)
16. Install rear case assembly to center case assembly.
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ASSEMBLY
Final Assembly (Cont'd)
TF-155