steering LEXUS GS400 2000 Service Manual PDF

SR0DV±01
F02556
F02557
Stopper
R06091
SR±28
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
2198 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL PS VANE PUMP ASSEMBLY
(a) Torque the 2 bolts.
Torque: 58 N´m (590 kgf´cm, 43 ft´lbf)
(b) Connect the connector.
2. CONNECT PRESSURE FEED TUBE
Torque the union bolt over a new gasket.
HINT:
Make sure that the stopper of the tube is touching the PS vane
pump body, as shown, before torquing the bolt.
Torque: 49 N´m (500 kgf´cm, 36 ft´lbf)
3. CONNECT RETURN HOSE
Connect the hose with the clip.
4. INSTALL DRIVE BELT
Loosen the drive belt tension by turning the drive belt tensioner
clockwise, and install the belt.
5. INSTALL ENGINE UNDER COVER
Tighten the 16 bolts.
6. BLEED POWER STEERING SYSTEM
(See page SR±3)

SR0DG±01
R07281
Normal Abnormal
± STEERINGPOWER STEERING FLUID
SR±3
2173 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
POWER STEERING FLUID
BLEEDING
1. CHECK FLUID LEVEL
(See page SR±4)
2. JACK UP FRONT OF VEHICLE AND SUPPORT IT
WITH STANDS
3. TURN STEERING WHEEL
With the engine stopped, turn the wheel slowly from lock to lock
several times.
4. LOWER VEHICLE
5. START ENGINE
Run the engine at idle for a few minutes.
6. TURN STEERING WHEEL
(a) With the engine at idling, turn the wheel to left or right full
lock position and keep it there for 2±3 seconds, then turn
the wheel to the opposite full lock position and keep it
there for 2±3 seconds.
(b) Repeat (a) several times.
7. STOP ENGINE
8. CHECK FOR FOAMING OR EMULSIFICATION
If the system has to be bled twice specifically because of foam-
ing or emulsification, check for fluid leaks in the system.
9. CHECK FLUID LEVEL
(See page SR±4)

SR0DH±01
F03835
R07281
Normal Abnormal
R11361
5 mm (0.2 in.) or less
Engine Idling Engine Stopped SR±4
± STEERINGPOWER STEERING FLUID
2174 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. CHECK FLUID LEVEL
(a) Keep the vehicle level.
(b) With the engine stopped, check the fluid level in the oil
reservoir.
If necessary, add fluid.
Fluid: ATF DEXRON® II or III
HINT:
Check that the fluid level is within the HOT LEVEL range on the
reservoir cap dipstick.
If the fluid is cold, check that it is within the COLD LEVEL range.
(c) Start the engine and run it at idle.
(d) Turn the steering wheel from lock to lock several times to
boost fluid temperature.
Fluid temperature: 80°C (176°F)
(e) Check for foaming or emulsification.
If there is foaming or emulsification, bleed power steering sys-
tem. (See page SR±3)
(f) With the engine idling, measure the fluid level in the oil
reservoir.
(g) Stop the engine.
(h) Wait a few minutes and remeasure the fluid level in the oil
reservoir.
Maximum fluid level rise: 5 mm (0.20 in.)
If a problem is found, bleed power steering system.
(See page SR±3)
(i) Check the fluid level.

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.