Lexus RX300 (MCU15). Service manual — part 520

R06172

N00401

R11572

Teflon Ring

R11573

SST

Teflon Ring

SR–42

–

STEERING

POWER STEERING GEAR

LEXUS RX300 (RM785E)

(c)

Expand a new teflon ring with your fingers.

NOTICE:
Be careful not to over expand the teflon ring.

(d)

Coat the teflon ring with power steering fluid.

(e)

Install the teflon ring to the steering rack, and settle it
down with your fingers.

5.

IF NECESSARY, REPLACE TEFLON RINGS

(a)

Using a screwdriver, remove the 4 teflon rings from the
control valve assembly.

NOTICE:
Be careful not to damage the grooves for the teflon ring.
(b)

Expand 4 new teflon rings with your fingers.

NOTICE:
Be careful not to over expand the teflon ring.
(c)

Coat the teflon rings with power steering fluid.

(d)

Install the teflon rings to the control valve assembly, and
settle them down with your fingers.

(e)

Carefully slide the tapered end of SST over the teflon
rings until they fit to the control valve assembly.
SST

09631–20081

NOTICE:
Be careful not to damage the teflon rings.

SR068–06

F05628

Press

SST

Oil Seal

SST

W02101

Rack Teeth End

SST

F05730

Vinyl Tape

Bushing

–

STEERING

POWER STEERING GEAR

SR–43

LEXUS RX300 (RM785E)

REASSEMBLY

NOTICE:
When using a vise, do not overtighten it.
1.

COAT PARTS INDICATED BY ARROWS WITH POWER
STEERING FLUID OR MOLYBDENUM DISULFIDE
LITHIUM BASE GREASE (See page SR–31)

2.

INSTALL OIL SEAL

(a)

Coat a new oil seal lip with power steering fluid.

(b)

Install the oil seal to SST, and press them into the rack
housing.
SST

09950–60010 (09951–00240, 09951–00430,
09952–06010), 09950–70010 (09951–07360)

NOTICE:

S

Make sure that the oil seal is installed facing in the
correct direction.

S

Take care that the oil seal does not get reversed as
you install it.

3.

INSTALL STEERING RACK

(a)

Install SST to the steering rack.
SST

09631–33010

HINT:
If necessary, scrape the burrs off the steering rack teeth end
and burnish.
(b)

Coat the SST with power steering fluid.

(c)

Install the steering rack into the rack housing.

(d)

Remove the SST.
SST

09631–33010

4.

INSTALL BUSHING

(a)

Coat a new O–ring with power steering fluid and install it
to the bushing.

(b)

To prevent oil seal lip damage, wind vinyl tape on the
steering rack end, and apply power steering fluid.

(c)

Install the bushing.

NOTICE:
Make sure that the oil seal is installed facing in the correct
direction.

R11656

SST

Wire

Stopper

Cylinder End

F05629

SST

R11657

F05630

R11575

Vinyl Tape

SR–44

–

STEERING

POWER STEERING GEAR

LEXUS RX300 (RM785E)

5.

INSTALL CYLINDER END STOPPER

(a)

Align the installation hole for the wire of the cylinder end
stopper with the slot of the rack housing.

(b)

Install a new wire into the cylinder end stopper.

(c)

Using SST, turn the cylinder end stopper clockwise 450
± 50°.
SST

09631–10021

6.

AIR TIGHTNESS TEST

(a)

Install the SST to 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 a change in the vacuum, check the installation of the
oil seals.

7.

INSTALL RACK HOUSING NO. 2 BRACKET AND
GROMMET

(a)

Install the rack housing No. 2 grommet to the rack housing
No. 2 bracket.

HINT:
Align the projection of the grommet with the hole of the rack
housing No. 2 bracket.
(b)

Align the matchmarks on the rack housing No. 2 bracket
and rack housing.

(c)

Place the rack housing No. 2 bracket in a vise and tighten
the vise to fasten the clamp.

8.

INSTALL CONTROL VALVE ASSEMBLY

(a)

To prevent oil seal lip damage, wind vinyl tape on the ser-
rated part of the control valve shaft.

(b)

Coat the teflon rings with power steering fluid.

(c)

Install the control valve assembly into the control valve
housing.

NOTICE:
Be careful not to damage the teflon rings and oil seal lip.

W03562

Press

SST

Oil Seal

R11648

SST

R11659

Punch

–

STEERING

POWER STEERING GEAR

SR–45

LEXUS RX300 (RM785E)

9.

INSTALL OIL SEAL

(a)

Coat a new oil seal lip with power steering fluid.

(b)

Using SST, press in the oil seal.
SST

09612–22011

NOTICE:
Make sure that the oil seal is installed facing in the correct
direction.
10.

INSTALL CONTROL VALVE HOUSING WITH CON-
TROL VALVE ASSEMBLY

(a)

Place a new gasket on the rack housing.

(b)

Align the matchmarks on the control valve housing and
rack housing.

(c)

Install the 2 bolts.
Torque: 18 N·m (180 kgf·cm, 13 ft·lbf)

11.

INSTALL SELF–LOCKING NUT

Using SST, stop the control valve shaft rotating and install a new
self–locking nut.

SST

09616–00011

Torque: 25 N·m (250 kgf·cm, 18 ft·lbf)

12.

INSTALL DUST COVER

13.

INSTALL RACK HOUSING 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)

Install the rack housing cap.
Torque: 59 N·m (600 kgf·cm, 43 ft·lbf)

(c)

Using a punch and a hammer, stake the 2 parts of the rack
housing cap.

14.

INSTALL RACK GUIDE SUB–ASSEMBLY, RACK
GUIDE SPRING AND RACK GUIDE SPRING CAP

(a)

Install the rack guide sub–assembly and rack guide
spring.

(b)

Apply sealant to 2 or 3 threads of the rack guide spring
cap.
Sealant:
Part No.08833–00080, THREE BOND 1344,
LOCTITE 242 or equivalent

(c)

Temporarily install the rack guide spring cap.