LEXUS GS400 2000 Service Repair Manual

F03674
SST
IN
OUT
Pressure Feed Tube Attachment 2JZ±GE: 1UZ±FE:
Attachment
OUT IN Pressure Feed Tube
± STEERINGPOWER STEERING FLUID
SR±5
2175 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
2. CHECK STEERING FLUID PRESSURE
(a) 1UZ±FE:
Remove the air cleaner inlet.
(b) 1UZ±FE:
Remove the air cleaner assembly with air cleaner hose.
(See page SR±31)
(c) Disconnect the pressure feed tube from the PS vane
pump.
(2JZ±GE Engine: See page SR±21)
(1UZ±FE Engine: See page SR±31)
SST 09631±22020
(d) Connect SST, as shown below.
SST 09640±10010 (09641±01010, 09641±01030,
09641±01060)
NOTICE:
Check that the valve of the SST is in the open position.
(e) Bleed the power steering system.
(See page SR±3)
(f) Start the engine and run it at idle.
(g) Turn the steering wheel from lock to lock several times to
boost fluid temperature.
Fluid temperature: 80 °C (176 °F)

Z15498
PS Gear
Closed
SSTPS Vane
Pump Oil
Reservoir
Z15499
PS Gear
SSTPS Vane
Pump Oil
Reservoir
Open
Z15500
PS Gear
SSTPS Vane
Pump Oil
Reservoir
Open Lock Position SR±6
± STEERINGPOWER STEERING FLUID
2176 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(h) With the engine idling, close the valve of the SST and ob-
serve the reading on the SST.
Minimum fluid pressure:
8,336 kPa (85 kgf/cm
2, 1,209 psi)
NOTICE:

Do not keep the valve closed for more than 10 se-
conds.

Do not let the fluid temperature become too high.
(i) With the engine idling, open the valve fully.
(j) Measure the fluid pressure at engine speeds of 1,000 rpm
and 3,000 rpm.
Difference fluid pressure:
490 kPa (5 kgf/cm
2, 71 psi) or less
NOTICE:
Do not turn the steering wheel.
(k) With the engine idling and valve fully opened, turn the
steering wheel to full lock.
Minimum fluid pressure:
8,336 kPa (85 kgf/cm
2, 1,209 psi)
NOTICE:

Do not maintain lock position for more than 10 se-
conds.

Do not let the fluid temperature become too high.
(l) Disconnect the SST.
(m) Connect the pressure feed tube.
(2JZ±GE Engine: See page SR±28)
(1UZ±FE Engine: See page SR±41)
(n) 1UZ±FE Engine:
Install the air cleaner assembly with air cleaner hose.
(See page SR±41)
(o) 1UZ±FE Engine:
Install the air cleaner inlet.
(p) Bleed the power steering system.
(See page SR±3)

SR0E2±01
F03672
 ClipGrommetBracket
65 (660, 48)
87 (890, 64)
5 (55, 48 in.´lbf)
42 (430, 31)
Intermediate Shaft
Assembly
PS Gear Assembly Return Tube
Pressure Feed Tube Tube Clamp
Union Bolt
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable part2JZ±GE:
42 (430, 31)
Union Bolt
5 (55, 48 in.´lbf)
Tube Clamp
Return
Tube  Gasket
 Gasket
Pressure Feed Tube
 Clip
87 (890, 64)
65 (660, 48)
35 (360, 26)
SR±42
± STEERINGPOWER STEERING GEAR
2212 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
POWER STEERING GEAR
COMPONENTS

F03664
Tie Rod End
Lock Nut
Rack Boot
 Claw Washer
Steering Rack
 Claw Washer Rack HousingClip
 Clamp
 O±Ring
Bushing
 Oil Seal Spacer
Cylinder End
Stopper
O±Ring
 Teflon Ring
 Oil Seal
Rack End
 Clamp
Rack Boot
Clip
Lock Nut
Tie Rod End
N´m (kgf´cm, ft´lbf) : Specified torque
Non±reusable part
Molybdenum disulfide lithium base grease
Power Steering fluid
*For use with SST
55 (560, 41)
55 (560, 41)
103 (1,050, 76)
*76 (770, 56)
103 (1,050, 76)
*76 (770, 56)
59 (600, 43)
Rack End
± STEERINGPOWER STEERING GEAR
SR±43
2213 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

F03665
N´m (kgf´cm, ft´lbf) : Specified torque
Non±reusable part
Molybdenum disulfide lithium base grease
Power Steering fluid
*For use with SST

Precoated partRack Housing

Rack Guide Spring
Cap Lock Nut Rack Guide
Sub±AssemblyRack Guide
Spring
Rack Guide
Spring Cap Teflon Ring Control Valve AssemblyBearing O±Ring
 Oil Seal Dust Cover
Control Valve
Housing
Turn Pressure Tube
 Union Seat
Bearing Guide Nut
25 (250, 18)
* 20 (203, 15)
18 (185, 13)
18 (185, 13)
25 (250, 18)
* 20 (203, 15)
25 (250, 18)
69 (700, 51)
* 51 (521, 38)
 O±Ring Oil Seal
SR±44
± STEERINGPOWER STEERING GEAR
2214 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

SR0E3±03
F02565
± STEERINGPOWER STEERING GEAR
SR±45
2215 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
NOTICE:
Remove the steering wheel assembly before the steering
gear removal, because there is possibility of breaking of
the spiral cable.
1. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
2. REMOVE STEERING WHEEL PAD
(See page SR±11)
3. REMOVE STEERING WHEEL
(See page SR±11)
4. DISCONNECT RH AND LH TIE ROD ENDS
(See page SA±9)
5. DISCONNECT INTERMEDIATE SHAFT ASSEMBLY
(See page SR±11)
6. DISCONNECT PRESSURE FEED AND RETURN
TUBES
(a) Pressure feed tube:
Remove the union bolt and gasket.
(b) Return tube:
Remove the union bolt and 2 gaskets.
7. 2JZ±GE Engine:
DISCONNECT TUBE CLAMP
Remove the bolt.
8. 1UZ±FE Engine:
DISCONNECT 2 TUBE CLAMPS
Remove the bolt.
9. REMOVE PS GEAR ASSEMBLY
(a) Disconnect the connector.
(b) Remove the 4 gear assembly set bolts.
10. REMOVE BRACKET AND GROMMET

SR0E4±01
F02585
SST
F02587
SST
F02588
Matchmarks
F03698
F03699
SR±46
± STEERINGPOWER STEERING GEAR
2216 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
NOTICE:
When using a vise, do not overtighten it.
1. REMOVE 2 TURN PRESSURE TUBES
(a) Using SST, remove the tube.
SST 09633±00020
(b) Remove the union seat from the rack housing.
2. SECURE PS GEAR ASSEMBLY IN VISE
Using SST, secure the gear assembly in a vise, as shown in the
illustration.
SST 09612±00012
3. REMOVE RH AND LH TIE ROD ENDS AND LOCK
NUTS
Place matchmarks on the tie rod end and rack end.
4. REMOVE RH AND LH CLIPS, RACK BOOTS AND
CLAMPS
Using pliers, loosen the clamp, as shown in the illustration.
NOTICE:

Be careful not to damage the boot.

Mark the RH and LH boots.
5. REMOVE RH AND LH RACK ENDS AND CLAW WASH-
ERS
(a) Using a screwdriver and hammer, stake back the washer.
NOTICE:
Avoid any impact to the steering rack.

F02589
SST
F02590
SST
F02591
Matchmarks
F03652
SST
± STEERINGPOWER STEERING GEAR
SR±47
2217 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Using a spanner to hold the steering rack steady, and us-
ing SST, remove the rack end.
SST 09922±10010
NOTICE:

Use SST 09922±10010 in the direction shown in the il-
lustration.

Mark the RH and LH rack ends.
6. REMOVE RACK GUIDE SPRING CAP LOCK NUT
Using SST, remove the nut.
SST 09922±10010
NOTICE:
Use SST 09922±10010 in the direction shown in the illustra-
tion.
7. REMOVE RACK GUIDE SPRING CAP
8. REMOVE RACK GUIDE SPRING AND RACK GUIDE
SUB±ASSEMBLY
9. REMOVE DUST COVER
10. REMOVE CONTROL VALVE HOUSING WITH CON-
TROL VALVE ASSEMBLY
(a) Place matchmarks on the valve housing and rack hous-
ing.
(b) Remove the 2 bolts.
(c) Pull out the control valve assembly with the valve hous-
ing.
(d) Remove the O±ring from the rack housing.
11. REMOVE CONTROL VALVE ASSEMBLY
(a) Using SST, loosen the bearing guide nut.
SST 09631±20060

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)