LEXUS GS400 2000 Service Repair Manual

SR0DR±01
R06091
F02556
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
SR±21
2191 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE ENGINE UNDER COVER
Remove the 16 bolts.
2. REMOVE DRIVE BELT
Loosen the drive bolt tension by turning the drive belt tensioner
clockwise, and remove the belt.
3. REMOVE RETURN HOSE
Remove the clip and disconnect the hose.
4. REMOVE PRESSURE FEED TUBE
Remove the union bolt and gasket.
5. REMOVE PS VANE PUMP ASSEMBLY
(a) Disconnect the connector.
(b) Remove the 2 bolts.

SR0DS±01
F02544
F02545
SST
F02547SST
W01277
Vane Pump Press
Vinyl Tape
Front Housing
Oil Seal
Bearing Shaft
SR±22
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
2192 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
NOTICE:
When using a vise, do not overtighten it.
1. MEASURE PS VANE PUMP ROTATING TORQUE
(a) Check that the pump rotates smoothly without abnormal
noise.
(b) Using a torque wrench, check the pump rotating torque.
Rotating torque:
0.25 N´m (2.5 kgf´cm, 2.2 in.´lbf) or less
2. REMOVE VANE PUMP PULLEY
Using SST to stop the pulley rotating, remove the pulley set nut.
SST 09960±10010 (09962±01000, 09963±01000)
3. REMOVE OIL RESERVOIR
(a) Remove the 3 bolts and oil reservoir.
(b) Remove the O±ring from the oil reservoir.
4. REMOVE SOLENOID VALVE
(a) Using SST, remove the valve.
SST 09922±10010
NOTICE:
Use SST 09922±10010 in the direction shown in the illustra-
tion.
(b) Remove the O±ring from the valve.
5. REMOVE FLOW CONTROL VALVE AND SPRING
6. REMOVE REAR HOUSING
(a) Remove the 2 bolts.
(b) Remove the 2 O±rings from the housing.
7. REMOVE WAVE WASHER
8. REMOVE SIDE PLATE
9. REMOVE CAM RING, 10 VANE PLATES AND VANE
PUMP ROTOR
NOTICE:
Be careful not to drop the plate.
10. REMOVE STRAIGHT PINS
Remove the 2 pins from the front housing.
11. REMOVE GASKET
12. REMOVE VANE PUMP SHAFT WITH BEARING
(a) Using snap ring pliers, remove the snap ring from the front
housing.
(b) Wind vinyl tape on the serrated part of the vane pump
shaft.
(c) Press out the shaft with the bearing.
NOTICE:
Be careful not to damage the oil seal lip.

SR0DT±01
W01278
Vane Pump Shaft
Front Housing
Bushing
N00372
HeightThickness
Length
R10282
Feeler Gauge
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
SR±23
2193 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
NOTICE:
When using a vise, do not overtighten it.
1. CHECK OIL CLEARANCE BETWEEN VANE PUMP
SHAFT AND BUSHING
Using a micrometer and caliper gauge, measure the oil clear-
ance.
Standard clearance:
0.03 ± 0.05 mm (0.0012 ± 0.0020 in.)
Maximum clearance: 0.07 mm (0.0028 in.)
If it is more than the maximum, replace the shaft and front hous-
ing.
2. INSPECT VANE PUMP ROTOR AND VANE PLATES
(a) Using a micrometer, measure the height, thickness and
length of the 10 plates.
Minimum height: 8.6 mm (0.339 in.)
Minimum thickness: 1.40 mm (0.0551 in.)
Minimum length: 14.99 mm (0.5902 in.)
(b) Using a feeler gauge, measure the clearance between
the rotor groove and plate.
Maximum clearance: 0.033 mm (0.0013 in.)

R13897Inscribed Mark
R07603
R07591
Compressed Air
R07600
Inscribed
Mark
SR±24
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
2194 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
If it is more than the maximum, replace the plate and/or rotor
with one having the same mark stamped on the cam ring.
Inscribed mark: 1, 2, 3, 4 or None
HINT:
There are 5 vane plate lengths with the following rotor and cam
ring marks:
Rotor and cam
ring markVane plate part
numberVane plate length
mm (in.)
None44345±2601014.999±15.001
(0.59051±0.59059)
144345±2602014.997±14.999
(0.59043±0.59051)
244345±2603014.995±14.997
(0.59035±0.59043)
344345±2604014.993±14.995
(0.59027±0.59035)
444345±2605014.991±14.993
(0.59020±0.59027)
3. INSPECT FLOW CONTROL VALVE
(a) Coat the valve with power steering fluid and check that it
falls smoothly into the valve hole by its own weight.
(b) Check the flow control valve for leakage.
Close one of the holes and apply compressed air
392±490 kPa (4±5 kgf/cm
2, 57±71 psi) into the opposite
side, and confirm that air does not come out from the end
holes.
If necessary, replace the valve with one having the same letter
as inscribed on the front housing.
Inscribed mark: A, B, C, D, E or F

R08702
Calipers
W01743
SST
Oil Seal Front Housing
F02574
Press
SST Front Housing
Oil Seal
W01280
Press
Vinyl Tape
Vane Pump
Bearing Shaft
REMOVE INSTALL
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
SR±25
2195 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
4. INSPECT SPRING
Using calipers, measure the free length of the spring.
Minimum free length: 33.2 mm (1.307 in.)
If it is not within the specification, replace the spring.
5. IF NECESSARY, REPLACE OIL SEAL
(a) Using SST, tap out the oil seal from the front housing.
SST 09631±10030
NOTICE:
Be careful not to damage the bushing of the front housing.
(b) Coat a new oil seal lip with power steering fluid.
(c) Using SST, press in the oil seal.
SST 09950±60010 (09951±00330),
09950±70010 (09951±07100)
NOTICE:
Make sure to install the oil seal facing the correct direction.
6. IF NECESSARY, REPLACE BEARING
(a) Press out the bearing from the vane pump shaft.
(b) Using snap ring expander, replace the snap ring with new
one.
NOTICE:
Be careful not to damage the shaft.
(c) Coat a new bearing with power steering fluid.
(d) Press in the bearing to the shaft.

SR0DU±01
W01281
Press
SST
Bearing
Oil Seal
Front Housing
Vinyl Tape
F02546
Inscribed Mark
R01149
Round End SR±26
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
2196 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REASSEMBLY
NOTICE:
When using a vise, do not overtighten it.
1. COAT WITH POWER STEERING FLUID
(See page SR±19)
2. INSTALL VANE PUMP SHAFT WITH BEARING
(a) Wind vinyl tape on the serrated part of the vane pump
shaft.
(b) Using SST, press in the shaft with the bearing.
SST 09608±04031
NOTICE:
Be careful not to damage the oil seal.
(c) Using snap ring pliers, install a new snap ring to the front
housing.
3. INSTALL STRAIGHT PINS
Using a plastic hammer, tap in 2 new pins to the front housing.
NOTICE:
Be careful not to damage the pins.
4. INSTALL CAM RING
Install the ring with the inscribed mark facing outward.
HINT:
Align the holes of the cam ring with the straight pins.
5. INSTALL VANE PUMP ROTOR
Install the rotor with the inscribed mark facing outward.
6. INSTALL VANE PLATES AND GASKET
(a) Install the 10 plates with the round end facing outward.
(b) Install a new gasket on the front housing.
NOTICE:
Be careful the direction of the gasket.
7. INSTALL SIDE PLATE
Align the holes of the plate and 2 straight pins.

R11292
F02548
Fulcrum
Length
SST
F02545
SST
± STEERINGPOWER STEERING VANE PUMP (2JZ±GE)
SR±27
2197 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
8. INSTALL WAVE WASHER
Install the washer so that its protrusions fit into the slots in the
side plate.
9. INSTALL REAR HOUSING
(a) Coat 2 new O±rings with power steering fluid and install
them to the housing.
(b) Torque the 2 bolts.
Torque: 24 N´m (240 kgf´cm, 17 ft´lbf)
10. INSTALL SPRING AND FLOW CONTROL VALVE
Install the valve facing the correct direction.
(See page SR±19)
11. INSTALL SOLENOID VALVE
(a) Install a new O±ring with power steering fluid and install
it to the valve.
(b) Using SST, install the valve.
SST 09922±10010
Torque: 51 N´m (524 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.).
12. INSTALL OIL RESERVOIR
(a) Coat a new O±ring with power steering fluid and install it
to the oil reservoir.
(b) Torque the 3 bolts.
Torque:
Front side bolt: 13 N´m (130 kgf´cm, 9 ft´lbf)
Rear side bolts: 24 N´m (240 kgf´cm, 17 ft´lbf)
13. INSTALL VANE PUMP PULLEY
Using SST to stop the pulley rotating, torque the pulley set nut.
SST 09960±10010 (09962±01000, 09963±01000)
Torque: 43 N´m (440 kgf´cm, 32 ft´lbf)
14. MEASURE PS VANE PUMP ROTATING TORQUE
(See page SR±22)

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.