LEXUS GS400 2000 Service Repair Manual

W01750
SST
Oil Seal
SSTPress
F03655
Needle Roller
Bearing
R09561
Bearing
R11302
R16011Bushing
SR±50
± STEERINGPOWER STEERING GEAR
2220 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Coat a new oil seal lip with power steering fluid.
(c) Using SST, press in the oil seal.
SST 09950±60010 (09951±00280, 09951±00360,
09952±06010), 09950±70010 (09951±07100)
NOTICE:
Make sure to install the oil seal facing the correct direction.
4. INSPECT BEARING
(a) Check the needle roller bearing of the rack housing for pit-
marks or damage.
If faulty, replace the rack housing.
(b) Coat the inside of the bearing with molybdenum disulfide
lithium base grease.
5. INSPECT BEARING
(a) Check the bearing rotation condition and check for abnor-
mal noise.
If the bearing is worn or damaged, replace the control valve as-
sembly.
(b) Coat the bearing with molybdenum disulfide lithium base
grease.
6. INSPECT BUSHING
(a) Check the inside of the bushing of the cylinder end stop-
per for cracks. If faulty, replace the bushing.
(b) Apply molybdenum disulfide lithium base grease to the in-
side of the bushing.
7. IF NECESSARY, REPLACE BUSHING
(a) Using a screwdriver, remove the bushing from the cylin-
der end stopper.
NOTICE:
Be careful not to damage the cylinder end stopper.
(b) Coat the inside of a new bushing with molybdenum disul-
fide lithium base grease.
(c) Install the bushing.

R10955
R06172
N00401
R09564
Z06085
SST
± STEERINGPOWER STEERING GEAR
SR±51
2221 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
8. IF NECESSARY, REPLACE TEFLON RING AND O±
RING
(a) Using a screwdriver, remove the teflon ring and O±ring
from the steering rack.
NOTICE:
Be careful not to damage the groove for the ring.
(b) Coat a new O±ring with power steering fluid and install it.
(c) Expand a new teflon ring with your fingers.
NOTICE:
Be careful not to overexpand the ring.
(d) Coat the ring with power steering fluid.
(e) Install the ring to the rack, and settle it down with your fin-
gers.
9. IF NECESSARY, REPLACE TEFLON RINGS
(a) Using a screwdriver, remove the 4 rings from the control
valve assembly.
NOTICE:
Be careful not to damage the grooves for the ring.
(b) Expand 4 new rings with your fingers.
NOTICE:
Be careful not to overexpand the ring.
(c) Coat the rings with power steering fluid.
(d) Install the rings to the control valve assembly, and settle
them down with your fingers.
(e) Carefully slide the tapered end of SST over the rings until
the ring fits to the steering rack.
SST 09631±20081
NOTICE:
Be careful not to damage the rings.

SR0E6±03
F03670
SST
SST Oil Seal
W02101
Rack Teeth End
SST
R11307
SST
SR±52
± STEERINGPOWER STEERING GEAR
2222 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REASSEMBLY
NOTICE:
When using a vise, do not overtighten it.
1. COAT WITH POWER STEERING FLUID OR MOLYBDE-
NUM DISULFIDE LITHIUM BASE GREASE
(See page SR±42)
2. INSTALL OIL SEAL
(a) Coat a new oil seal lip with power steering fluid.
(b) Using SST, press in the oil seal.
SST 09951±60010 (09951±00330, 09951±00490,
09952±06010), 09950±70010 (09951±07360)

Make sure to install the oil seal facing the correct
direction.

Take care that the oil seal does not get reversed as
you install it.
3. INSTALL STEERING RACK
(a) Install SST to the rack.
SST 09631±20102
HINT:
If necessary, scrape the burrs off the rack teeth end and bur-
nish.
(b) Coat SST with power steering fluid.
(c) Install the rack into the rack housing.
(d) Remove the SST.
4. INSTALL OIL SEAL
(a) Install SST to the steering rack opposite end.
SST 09631±20102
(b) Coat SST with power steering fluid.
(c) Coat a new oil seal lip with power steering fluid.
(d) Install the oil seal by pushing it onto the SST without tilt-
ing.
NOTICE:
Make sure to install the oil seal facing the correct direction.
(e) Remove the SST.

F03656
SST
W00112
Cylinder End Stopper
Wooden
Block
W00113
Cylinder End Stopper
SST
F03657
SST
F03658
Vinyl Tape
± STEERINGPOWER STEERING GEAR
SR±53
2223 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
5. INSTALL SPACER AND CYLINDER END STOPPER
(a) Using SST and a hammer, drive in the spacer.
SST 09950±60010 (09951±00280, 09951±00420,
09952±06010), 09950±70010 (09951±07200)
(b) Coat a new O±ring with power steering fluid, and install
it to the stopper.
(c) Using a wooden block and hammer, drive in the stopper
until it is tightly installed.
NOTICE:
Be careful not to damage the O±ring.
(d) Using SST, torque the stopper.
SST 09631±20120
Torque: 59 N´m (600 kgf´cm, 43 ft´lbf)
6. AIR TIGHTNESS TEST
(a) Install SST to the unions of the rack housing.
SST 09631±12071
(b) Apply 53 kPa (400 mmHg, 15.75 in.Hg) of vacuum for
about 30 seconds.
(c) Check that there is no change in the vacuum.
If there is change in the vacuum, check the installation of the oil
seals.
7. INSTALL CONTROL VALVE ASSEMBLY
(a) Coat the teflon rings with power steering fluid.
(b) To prevent oil seal lip damage, wind vinyl tape on the ser-
rated part of the control valve shaft.
(c) Push the valve assembly into the control valve housing.
NOTICE:
Be careful not to damage the teflon rings and oil seal lip.

F03653
SST
F03654
F03659
17°
F03660
SST
SR±54
± STEERINGPOWER STEERING GEAR
2224 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(d) Coat a new O±ring with power steering fluid, and install
it to the bearing guide nut.
(e) Using SST, torque the nut.
SST 09631±20060
Torque: 25 N´m (250 kgf´cm, 18 ft´lbf)
NOTICE:
Be careful not to damage the oil seal lip.
(f) Using a punch, stake the nut.
8. INSTALL CONTROL VALVE HOUSING WITH CON-
TROL VALVE ASSEMBLY
(a) Coat a new O±ring with power steering fluid, and install
it to the valve housing.
(b) Align the matchmarks on the valve housing and rack
housing, and install the valve housing with the valve as-
sembly to the rack housing.
(c) Torque the 2 bolts.
Torque: 18 N´m (185 kgf´cm, 13 ft´lbf)
9. INSTALL DUST COVER
10. INSTALL RACK GUIDE SUB±ASSEMBLY, RACK
GUIDE SPRING AND RACK GUIDE SPRING CAP
(a) Apply sealant to 2 or 3 threads of the cap.
Sealant:
Part No. 08833±00080, THREE BOND 1344,
LOCTITE 242 or equivalent
(b) Temporarily install the cap.
11. ADJUST TOTAL PRELOAD
(a) To prevent the steering rack teeth from damaging the oil
seal lip, temporarily install the RH and LH rack ends.
(b) Torque the rack guide spring cap.
Torque: 25 N´m (250 kgf´cm, 18 ft´lbf)
(c) Return the cap 17°.
(d) Using SST, turn the control valve shaft right and left 1 or
2 times.
SST 09616±00010
(e) Loosen the cap until the rack guide spring is not function-
ing.

F03661
SST
F03662
SST
Fulcrum
Length
R07337
Rack Groove
F03663Fulcrum Length SST
± STEERINGPOWER STEERING GEAR
SR±55
2225 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(f) Using SST and a torque wrench, tighten the cap until the
preload is within specification.
SST 09616±00010
Preload (turning):
0.5 ±1.7 N´m (4.7±17.2 kgf´cm, 4.1±14.9 in.´lbf)
12. INSTALL RACK GUIDE SPRING CAP LOCK NUT
(a) Apply sealant to 2 or 3 threads of the nut.
Sealant:
Part No.08833±00080, THREE BOND 1344,
LOCTITE 242 or equivalent
(b) Holding the rack guide spring cap rotating, and using
SST, torque the nut.
SST 09922±10010
Torque: 51 N´m (521 kgf´cm, 38 ft´lbf)
NOTICE:
Use SST 09922±10010 in the direction shown in the illustra-
tion.
HINT:
Use a torque wrench with a fulcrum length of 345 mm (13.58
in.).
(c) Recheck the total preload.
Preload (turning):
0.5 ±1.7 N´m (4.7±17.2 kgf´cm, 4.1±14.9 in.´lbf)
(d) Remove the RH and LH rack ends.
13. INSTALL RH AND LH CLAW WASHERS AND RACK
ENDS
(a) Install a new washer, and temporarily tighten the rack
end.
HINT:
Align the claws of the washer with the steering rack grooves.
(b) Using a spanner to hold the steering rack steady, and us-
ing SST, torque the rack end.
SST 09922±10010
Torque: 76 N´m (770 kgf´cm, 56 ft´lbf)
NOTICE:
Use SST 09922±10010 in the direction shown in the illustra-
tion.
HINT:
Use a torque wrench with a fulcrum length of 345 mm (13.58
in.).

R06400
Brass Bar
W00123
W04397
F02586
SSTFulcrum
Length
SR±56
± STEERINGPOWER STEERING GEAR
2226 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(c) Using a brass bar and hammer, stake the washer.
NOTICE:
Avoid any impact to the rack.
14. INSTALL RH AND LH 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 is turned.
(b) Install the boot.
NOTICE:
Be careful not to damage or twist the boot.
(c) Using pliers tighten a new clamp, as shown in the illustra-
tion.
15. INSTALL RH AND LH TIE ROD ENDS AND LOCK NUTS
(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 nut.
(See page SA±4)
Torque: 55 N´m (560 kgf´cm, 41 ft´lbf)
16. INSTALL 2 TURN PRESSURE TUBES
(a) Install a new union seat to the rack housing.
(b) Using SST, install the tube.
SST 09633±00020
Torque: 20 N´m (203 kgf´cm, 15 ft´lbf)
HINT:

Use a torque wrench with a fulcrum length of 300 mm
(11.81 in.).

This torque value is effective in case that SST is parallel
to a torque wrench.

SR0E7±01
F02565
± STEERINGPOWER STEERING GEAR
SR±57
2227 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL GROMMET AND BRACKET
2. INSTALL PS GEAR ASSEMBLY
(a) Torque the 4 gear assembly set bolts.
Torque: 65 N´m (660 kgf´cm, 48 ft´lbf)
(b) Connect the connector.
3. 2JZ±GE Engine:
CONNECT TUBE CLAMP
Torque the bolt.
Torque: 5 N´m (55 kgf´cm, 48 in.´lbf)
4. 1UZ±FE Engine:
CONNECT 2 TUBE CLAMPS
Torque the bolt.
Torque: 5 N´m (55 kgf´cm, 48 in.´lbf)
5. CONNECT INTERMEDIATE SHAFT ASSEMBLY
(See page SR±17)
6. CONNECT PRESSURE FEED AND RETURN TUBES
(a) Pressure feed tube:
Torque the union bolt over a new gaskets.
Torque: 42 N´m (430 kgf´cm, 31 ft´lbf)
(b) Return tube:
Torque the union bolt with a new gasket on each side of
the tube.
Torque: 42 N´m (430 kgf´cm, 31 ft´lbf)
7. CONNECT RH AND LH TIE ROD ENDS
(See page SA±9)
8. POSITION FRONT WHEELS FACING STRAIGHT
AHEAD
HINT:
Do it with the front of the vehicle jacked up.
9. CENTER SPIRAL CABLE
(See page SR±17)
10. INSTALL STEERING WHEEL
(a) Align the matchmarks on the wheel and steering column
main shaft.
(b) Temporarily tighten the wheel set nut.
(c) Connect the connector.
11. BLEED POWER STEERING SYSTEM
(See page SR±3)
12. CHECK STEERING WHEEL CENTER POINT
13. TORQUE STEERING WHEEL SET NUT
Torque: 35 N´m (360 kgf´cm, 26 ft´lbf)
14. INSTALL STEERING WHEEL PAD
(See page SR±17)
15. CHECK FRONT WHEEL ALIGNMENT
(See page SA±4)

SR0E8±01
F03696
1UZ±FE:
PPS Solenoid Valve
2JZ±GE:
PPS Solenoid
ValveTilt and Telescopic ECU
PPS ECU
SR±58
± STEERINGPROGRESSIVE POWER STEERING (PPS)
2228 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
PROGRESSIVE POWER STEERING (PPS)
LOCATION

F04512
2JZ±GE:
1UZ±FE:
Vacuum Hose
Vacuum Hose
SR0DI±01
± STEERINGAIR CONTROL VALVE
SR±7
2177 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
AIR CONTROL VALVE
INSPECTION
1. TURN AIR CONDITIONING SWITCH OFF
2. CHECK IDLE±UP
(a) Start the engine and run it at idle.
(b) Fully turn the steering wheel.
(c) Check that the engine rpm decreases when the vacuum
hose of the air control valve is pinched.
(d) Check that the engine rpm increases when the hose is re-
leased.