Lexus ES300 (1997 year). Manual — part 553

SR05Z–01

W03465

Pressure Feed Tube

SST

R11355

B

A

SR–20

–

STEERING

POWER STEERING VANE PUMP

1316

1997 LEXUS ES300 (RM511U)

REMOVAL

1.

REMOVE FRONT FENDER APRON SEAL RH

Remove the 2 bolts.
2.

DISCONNECT RETURN HOSE

NOTICE:
Take care not to spill fluid on the drive belt.

3.

DISCONNECT PRESSURE FEED TUBE

(a)

Remove the 2 clamp plate set nuts.

(b)

Remove the bolt.

(c)

Remove the 2 clamp plates and 2 holders from the tube.

(d)

Using SST, disconnect the tube.
SST

09631–22020

4.

REMOVE DRIVE BELT

Loosen the 2 (A and B) bolts.
5.

REMOVE PS VANE PUMP ASSEMBLY WITH PRES-
SURE FEED TUBE

(a)

Disconnect the connector from the oil pressure switch.

(b)

Loosen bolt A sufficiently so that pump assembly can be
removed.

HINT:
Bolt A cannot be removed.
6.

REMOVE PRESSURE FEED TUBE

(a)

Remove the oil pressure switch from the union bolt.

NOTICE:
Be careful not to drop the switch.
If the switch is dropped or strongly damaged, replace it with a
new one.
(b)

Remove the union bolt and gasket.

SR060–01

R11987

R11986

SST

–

STEERING

POWER STEERING VANE PUMP

SR–21

1317

1997 LEXUS ES300 (RM511U)

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:
0.3 N·m (2.8 kgf·cm, 2.4 in.·lbf) or less

2.

REMOVE VANE PUMP PULLEY

Using SST, to stop the pulley rotating, remove the nut.

SST

09960–10010 (09962–01000, 09963–01000)

3.

REMOVE FRONT AND REAR BRACKETS

Remove the 3 bolts and 2 nuts.
4.

REMOVE SUCTION PORT UNION

(a)

Remove the bolt.

(b)

Remove the O–ring from the union.

5.

REMOVE PRESSURE PORT UNION, FLOW CONTROL
VALVE AND SPRING

Remove the O–ring from the union.
6.

REMOVE REAR HOUSING

(a)

Remove the 4 bolts.

(b)

Remove the 2 O–rings from the housing.

7.

REMOVE WAVE WASHER

8.

REMOVE SIDE PLATE

9.

REMOVE GASKET

10.

REMOVE CAM RING, 10 VANE PLATES AND VANE
PUMP ROTOR

Using a screwdriver, remove the snap ring from the vane pump
shaft.
NOTICE:
Take care not to drop the plate.
11.

REMOVE VANE PUMP SHAFT

12.

REMOVE STRAIGHT PINS

Remove the 2 pins from the front housing.

SR061–04

R15196

Caliper Gauge

Micrometer

Vane Pump Shaft

Bushing

Front Housing

N00372

Height

Thickness

Length

R10282

Feeler Gauge

SR–22

–

STEERING

POWER STEERING VANE PUMP

1318

1997 LEXUS ES300 (RM511U)

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 front housing and
vane pump shaft.

2.

INSPECT VANE PUMP ROTOR AND VANE PLATES

(a)

Using a micrometer, measure the height, thickness and
length of the plates.
Minimum height: 8.6 mm (0.339 in.)
Minimum thickness: 1.397 mm (0.0550 in.)
Minimum length: 14.991 mm (0.5902 in.)

(b)

Using a feeler gauge, measure the clearance between
the rotor groove and plate.
Maximum clearance: 0.035 mm (0.0014 in.)

If it is more than the maximum, replace the plate and/or rotor
with one having the same mark stamped on the cam ring.

R13897

Inscribed Mark

R11288

R07591

Compressed Air

R11563

Inscribed Mark

–

STEERING

POWER STEERING VANE PUMP

SR–23

1319

1997 LEXUS ES300 (RM511U)

Inscribed mark: 1, 2, 3, 4 or None

HINT:
There are 5 vane lengths with the following rotor and cam ring
marks:

Rotor and cam

ring mark

Vane plate part

number

Vane plate length

mm (in.)

None

44345–26010

14.999–15.001

(0.59051–0.59059)

1

44345–26020

14.997–14.999

(0.59043–0.59051)

2

44345–26030

14.995–14.997

(0.59035–0.59043)

3

44345–26040

14.993–14.995

(0.59027–0.59035)

4

44345–26050

14.991–14.993

(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 valve for leakage. Close one of the holes and
apply 392–490 kPa (4–5 kgf/cm

2

, 57–71 psi) of com-

pressed air 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