2000 LEXUS GS400 Service Repair Manual

F03650
Vinyl Tape
R06498
SST
F03651
Press
SST
F03666Oil Seal SST
SR±48
± STEERINGPOWER STEERING GEAR
2218 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Wind vinyl tape to the control valve shaft.
(c) Using a plastic hammer, tap out the valve assembly with
the nut from the control valve housing.
NOTICE:
Be careful not to damage the oil seal lip.
(d) Remove the nut from the valve assembly.
NOTICE:
Be careful not to damage the oil seal lip.
(e) Remove the O±ring from the nut.
12. REMOVE CYLINDER END STOPPER AND SPACER
(a) Using SST, remove the stopper.
SST 09631±20090
(b) Remove the O±ring from the stopper.
13. REMOVE STEERING RACK AND OIL SEAL
(a) Using SST, press out the rack and oil seal.
NOTICE:
Take care not to drop the rack.
SST 09950±70010 (09951±07200)
(b) Remove the oil seal from the rack.
14. REMOVE OIL SEAL
Using SST, press out the oil seal.
SST 09950±60010 (09951±00280),
09950±70010 (09951±07360)

SR0E5±01
R10072
Dial Indicator
F03667
Press
SSTOil
Seal
BearingSST
F03668
Press
Oil Seal SST
SST
F03669
Press
Bearing
Oil Seal SST
W01749
Press
SST
Oil Seal
± STEERINGPOWER STEERING GEAR
SR±49
2219 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT STEERING RACK
(a) Using a dial indicator, check the rack for runout and for
teeth wear and damage.
Maximum runout: 0.03 mm (0.0118 in.)
(b) Check the back surface for wear and damage.
2. IF NECESSARY, REPLACE OIL SEAL AND BEARING
(a) Using SST, press out the oil seal and bearing from the
control valve housing.
SST 09950±60010 (09951±00260),
09950±70010 (09951±07150)
(b) Coat a new oil seal lip with power steering fluid.
(c) Using SST, press in the oil seal.
SST 09950±60010 (09951±00180, 09951±00330,
09952±06010), 09950±70010 (09951±07150)
NOTICE:
Make sure to install the oil seal facing the correct direction.
(d) Coat a new bearing with molybdenum disulfide lithium
base grease.
(e) Using SST, press in the bearing.
SST 09950±60010 (09951±00330),
09950±70010 (09951±07150)
3. IF NECESSARY, REPLACE OIL SEAL
(a) Using SST, press out the oil seal from the bearing guide
nut.
SST 09950±60010 (09951±00320),
09950±70010 (09951±07100)

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.).