lock LEXUS SC400 1991 Service Repair Manual

16. INSTALL RACK BOOTS, CLAMPS AND CLIPS
(a) Ensure that the tube hole is not clogged with grease.HINT: If the tube hole is clogged, the pressure inside the boot
will change after it is assembled and the steering wheel
turned.
(b) Install the boot.
NOTICE: Be careful not to damage or twist the boot.
(c) Install the clamp and clip to the boot.
17. INSTALL TIE ROD ENDS
(a) Screw the lock nut and tie rod end onto the rack end until the matchmarks are aligned.
(b) After adjusting toe±in, torque the lock nut.
Torque: 56 N Vm (570 kgf Vcm, 41 ft Vlbf)
18. INSTALL RIGHT AND LEFT TURN PRESSURE TUBES
(a) Install a new union seat.
(b) Using SST, tighten nut.
SST 09633±00020
Torque: 24 N Vm (240 kgf Vcm, 17 ft Vlbf)
HINT: Use a torque wrench with a fulcrum length of 300 mm
(11.81 in.).
(c) Install the union bolt over the new gaskets and torque it.
Torque: 34 N Vm (350 kgf Vcm, 25 ft Vlbf)
SR±162±
STEERING POWER STEERING
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TORQUE SPECIFICATIONS
SR0GQ±01\
 \
Part tightened NVm kgf Vcm ft Vlbf\
 \
STEERING COLUMN   
\
 \
Steering wheel 35 360 26\
 \
Steering wheel pad 7.4 75 65 in. Vlbf\
 \
Column bracket X Body 25 260 19\
 \
Sliding yoke 35 360 26\
 \
(Power tilt and power telescopic steering column)   
\
 \
Tilt steering housing support X Lower tube 13 130 9\
 \
Support stopper bolt lock nut 2.9 30 26 in. Vlbf\
 \
Connector bracket 4.9 50 43 in. Vlbf\
 \
Telescopic sensor plate 4.9 50 43 in. Vlbf\
 \
Telescopic adjusting screw 6.9 70 61 in. Vlbf\
 \
Telescopic adjusting screw lock nut 31 320 23\
 \
(Manual tilt and Manual telescopic steering column)   
\
 \
Tilt memory bolt 6.4 65 56 in. Vlbf\
 \
Tilt memory bolt set nut 5.9 60 52 in. Vlbf\
 \
Tilt lever assembly installation bolt 2.9 30 26 in. Vlbf\
 \
Tilt pawl set nut 5.9 60 52 in. Vlbf\
 \
Tilt lever retainer set nut 15 150 11\
 \
Compression spring bushing bolt 7.8 80 69 in. Vlbf\
 \
Steering column tube stopper bolt 19 195 14\
 \
Serration attachment set nut 13 130 9\
 \
Telescopic lever set bolt 25 260 19\
 \
Connector bracket set bolt 4.9 50 43 in. Vlbf\
 \
POWER STEERING PUMP   
\
 \
(SC 400)   
\
 \
PS pump installation bolt 39 400 29\
 \
PS pump installation nut 43 440 32\
 \
Pressure tube X Pressure port union 49 500 36\
 \
Drive pulley X Rotor shaft 43 440 32\
 \
Front housing X Rear bracket 39 400 29\
 \
Pressure port union X Pump housing 69 700 51\
 \
Suction port union X Pump housing 13 130 9\
 \
(SC 300)   
\
 \
PS pump installation bolt 58 590 43\
 \
Pressure tube X Pressure port union 49 500 36\
 \
Drive pulley X Rotor shaft 43 440 32\
 \
Front housing X Rear housing 17 170 12\
 \
Pressure port union X Pump housing 83 850 61\
 \
Reservoir tank X Pump housing Front side bolt 13 130 9\
 \
Rear side bolts 17 170 12
±
STEERING SERVICE SPECIFICATIONSSR±171
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\
\
POWER STEERING GEAR HOUSING   
\
\
Tie rod end X Steering knuckle 49 500 36
\
\
Control valve shaft X Universal joint 35 360 26
\
\
Pressure and return tube X Gear housing 49 500 36
\
\
Gear housing installation bolt 76 770 56
\
\
Pressure control valve X Control valve housing 18 185 13
\
\
Rack housing X Control valve housing 18 185 13
\
\
Control valve self±locking nut 39 400 29
\
\
Rack housing cap 69 700 51
\
\
Rack guide spring cap lock nut 56 570 41
\
\
Rack X Rack end 92 940 68
\
\
Tie rod end lock nut 56 570 41
\
\
Turn pressure tube union nut 24 240 17
\
\
Turn pressure tube union bolt 34 350 25
SR±172±
STEERING SERVICE SPECIFICATIONS
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STEERING COLUMN
DESCRIPTION
SR0EA±02
There are two types of steering column, the manual tilt/manual telescopic one\
, and the power tilt/power
telescopic one.
SR0EB±02
OPERATION
POWER TILT OPERATIONThe power tilt mechanism consists of the control gear assembly, tilt motor, tilt position sensor, tilt and tele-
scopic switch, unlock warning switch and tilt and telescopic ECU.
The control gear assembly consists of the worm wheel, tilt gear, tilt worm and slider. Rotation of the tilt motor
moves the slider towards the tilt worm. The column upper tube is integrated w\
ith the slider and is rotated
up and down by movement of the slider.
SR±4
±
STEERING STEERING COLUMN
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POWER TELESCOPIC OPERATION
SR0EC±02
The power telescopic mechanism is composed of the control gear assembly, telescopic motor, telescopic
position sensor, tilt and telescopic switch, unlock warning switch and tilt and telesco\
pic ECU.
The control gear assembly is composed of the worm wheel, telescopic scre\
w and slider. Rotation of the
telescopic motor moves the slider in the direction of the telescopic screw axis. The\
sliding tube is integrated
with the slider and is moved forward and backward by movement of the slider.
±
STEERING STEERING COLUMNSR±5
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MANUAL TELESCOPIC OPERATION (SC300)
SR0ED±04
When the telescopic lever is pushed down, the lock bolt is rotated by the gear and the sliding tube is re-
leased by the lock wedges, allowing forward and backwards adjustment.
On the other hand, when the telescopic lever is pushed up, the lock wedges\
press the sliding tube against
the breakaway bracket to stop it from moving.
SR±6
±
STEERING STEERING COLUMN
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MAIN POINTS OF REMOVAL AND
INSTALLATION
NOTICE:
wIf the SRS (Supplemental Restraint System) connector is
disconnected with the ignition switch at ON or ACC,
diagnostic trouble codes will be recorded.
w Never use SRS parts from another vehicle. When
replacing parts, replace with new parts.
1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROM
BATTERY
CAUTION: W ork must be started after 90 seconds from the time
the ignition switch is turned to the ªLOCKº position and the
negative (±) terminal cable is disconnected from the battery.
(See RS section)
2. REMOVE STEERING WHEEL PAD
(a) Place the front wheels facing straight ahead.
(b) Remove the No.2 and No.3 covers.
(c) Using a torx wrench, loosen the 4 torx screws. Torx wrench: T30 (Part No. 09042±00010 or locally manufac-
tured tool)
HINT: Loosen the 4 screws until the groove along the screw
circumference catches on the screw case.
(d) P u l l t h e w heel pad out from the steering wheel and
disconnect the Airbag connector.
NOTICE: When removing the wheel pad, take care not to pull
the Airbag wire harness.
CAUTION:
w When storing the wheel pad, keep the upper surface of
the pad facing upward.
w Never disassemble the wheel pad.
3. REMOVE STEERING WHEEL
(a) Disconnect the connector.
(b) Remove the steering wheel set nut.
(c) Place matchmarks on the steering wheel and main shaft.
(d) Using SST, remove the wheel.
SC400:
SST 09213±31021
SC300:
SST 09609±20011
SR±10
±
STEERING STEERING COLUMN
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4. CENTER SPIRAL CABLE
(a) Check that the front wheels are facing straight ahead.
(b) Turn the spiral cable counterclockwise by hand until it
becomes harder to turn the cable.
(c) Then rotate the spiral cable clockwise about 3 turns to align the red mark.
HINT: The spiral cable will rotate about 3 turns to either left
or right of the center.
5. INSTALL STEERING WHEEL
(a) Align matchmarks on the steering wheel and main shaft, and install the wheel to the shaft.
(b) Tighten the wheel set nut.
Torque: 35 N Vm (360 kgf Vcm, 26 ft Vlbf)
(c) Connect the connector.
6. INSTALL STEERING WHEEL PAD
(a) Connect the Airbag connector.
(b) Install the pad after confirming that the circumference groove
of the torx screws is caught on the screw case.
(c) Using a torx wrench, tighten the 4 torx screws.
Torque: 7.4 N Vm (75 kgf Vcm, 65 in. Vlbf)
NOTICE:
w Make sure the wheel pad is installed to the specified
torque.
w If the wheel pad has been dropped, or there are cracks,
dents or other defects in the case or connector, replace
the wheel pad with a new one.
w When installing the wheel pad, take care that the wiring
does not interfere with other parts and is not pinched
between other parts.
7. CHECK STEERING WHEEL CENTER POINT
8. CONNECT NEGATIVE (±) TERMINAL CABLE TO
BATTERY
±
STEERING STEERING COLUMNSR±11
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10. REMOVE TELESCOPIC LEVER LOCK BOLTInstall a double nut on the lock bolt, then remove the lock bolt.
11. REMOVE BREAKAWAY BRACKET
(a) Remove the steering column tube stopper bolt.
(b) Using snap ring pliers, remove the snap ring from the main shaft.
(c) Remove the breakaway bracket from the main shaft. Be careful the spline part of the main shaft does not come
loose.
12. REMOVE 2 LOCK WEDGES FROM BREAKAWAY BRACKET
13. REMOVE STEERING SHAFT THRUST STOPPER
14. REMOVE COMPRESSION SPRING
(a) Using a torx wrench, remove the bolt and spring. Torx wrench: T30 (Part No. 09042±00010 or locally manufac-
tured tool)
(b) Remove the 2 bushings from the spring.
SR±16
±
STEERING STEERING COLUMN
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15. REMOVE 3 TENSION SPRINGS
16. REMOVE TILT LEVER RETAINERS
(a) Using a hexagon wrench to hold the tilt memory bolt, removethe nut.
(b) Remove the nut and washer.
(c) Pull out the bolt.
(d) Remove the 2 E±rings and the spacer from the tilt lever lock shaft.
(e) Remove the 2 nuts from the tilt steering bolts.
(f) Remove the 2 tilt lever retainers.
(g) Remove the collar from the tilt memory bolt.
17. REMOVE RH TILT PAWL, PAWL STO PPER AND TILT
LEVER
18. REMOVE LH TILT PAWL, PAWL STOPPER, TILT SUB LEVER, TILT LEVER ASSEMBLY AND TILT LEVER LOCK
SHAFT
±
STEERING STEERING COLUMNSR±17
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