Lexus RX300 (MCU15). Manual — part 515

SR0MS–02

F03841

A

B

SST

SR–22

–

STEERING

POWER STEERING VANE PUMP

LEXUS RX300 (RM785E)

REMOVAL

1.

DISCONNECT RETURN HOSE

Remove the clip and disconnect the return hose.
NOTICE:
Take care not to spill fluid on the drive belt.
2.

REMOVE OIL PRESSURE SWITCH

(a)

Disconnect the connector.

(b)

Remove the oil pressure switch from the union bolt.

NOTICE:
Be careful not to drop the oil pressure switch.
If the oil pressure switch is dropped or strongly damaged, re-
place it with a new one.
3.

DISCONNECT PRESSURE FEED TUBE

Remove the union bolt and gasket and disconnect the pressure
feed tube.

4.

REMOVE DRIVE BELT

Using SST, loosen the 2 bolt (”A” and ”B”), and remove the drive
belt.

SST

09249–63010

5.

REMOVE PS VANE PUMP ASSEMBLY

(a)

Using SST, loosen the bolt ”A” sufficiently so that pump
assembly can be removed.
SST

09249–63010

(b)

Remove the bolt ”B” and PS vane pump assembly.

HINT:
Bolt ”A” cannot be removed.

SR060–04

R11987

R11986

SST

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STEERING

POWER STEERING VANE PUMP

SR–23

LEXUS RX300 (RM785E)

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

(a)

Using SST, stop the pulley rotating and loosen the nut.

(b)

Remove the nut and vane pump pulley from the vane
pump shaft.
SST

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

3.

REMOVE FRONT AND REAR BRACKETS

Remove the 3 bolts, front and rear brackets.
4.

REMOVE SUCTION PORT UNION

(a)

Remove the bolt and suction port union.

(b)

Remove the O–ring from the suction port union.

5.

REMOVE PRESSURE PORT UNION, FLOW CONTROL
VALVE AND SPRING

(a)

Remove the pressure port union, flow control valve and
spring.

(b)

Remove the O–ring from the pressure port union.

6.

REMOVE REAR HOUSING

(a)

Remove the 4 bolts and rear housing.

(b)

Remove the 2 O–rings from the rear housing.

7.

REMOVE WAVE WASHER

8.

REMOVE SIDE PLATE

9.

REMOVE GASKET

10.

REMOVE CAM RING, 10 VANE PLATES AND VANE
PUMP ROTOR

(a)

Remove the cam ring and 10 vane plates.

NOTICE:
Take care not to drop the plate.
(b)

Using a screwdriver, remove the snap ring and vane
pump rotor from the vane pump shaft.

11.

REMOVE VANE PUMP SHAFT

12.

REMOVE 2 STRAIGHT PINS

Remove the 2 straight pins from the front housing.

SR1CC–01

R15196

Caliper Gauge

Micrometer

Vane Pump Shaft

Bushing

Front Housing

N00372

Height

Thickness

Length

R10282

Feeler Gauge

SR–24

–

STEERING

POWER STEERING VANE PUMP

LEXUS RX300 (RM785E)

INSPECTION

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

MEASURE 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 vane 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 vane pump rotor groove and vane plate.
Maximum clearance: 0.035 mm (0.0014 in.)

R13897

Inscribed Mark

R11288

R07591

Compressed Air

R11563

Inscribed Mark

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STEERING

POWER STEERING VANE PUMP

SR–25

LEXUS RX300 (RM785E)

If it is more than the maximum, replace the vane plate and/or
vane pump rotor with the 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 vane pump ro-
tor 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 flow control valve with power steering fluid and
check that it falls smoothly into the flow control valve hole
by its own weight.

(b)

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

2

, 57 – 71 psi)

of compressed air into the opposite side hole, and confirm
that air does not come out from the end holes.

If necessary, replace the flow control valve with the one having
the same letter as inscribed on the front housing.

Inscribed mark: A, B, C, D, E or F