Lexus RX300 (MCU15). Service manual - part 581

D03663

D03664

D03666

–

AUTOMATIC TRANSAXLE

FORWARD CLUTCH

AX–67

U140F AX   (RM848E)

(c)

Remove the piston return spring.

4.

REMOVE FORWARD CLUTCH PISTON

(a)

Place the forward clutch drum onto the oil pump.

(b)

Holding the forward clutch piston with your hard, apply
compressed air (392 kPa, 4.0 kgf/cm

2

, 57 psi) to the oil

pump to remove the forward clutch piston.

HINT:
When the piston can not be removed as it is slanted, either blow
the air again with the protruding side pushed or remove the pis-
ton using the needle nose plier with vinyl tape on the tip.

5.

REMOVE O–RING

Using a small screwdriver, remove the 2 O–rings.

AX0AU–03

D04080

D03667

D03668

D03830

AX–68

–

AUTOMATIC TRANSAXLE

FORWARD CLUTCH

U140F AX   (RM848E)

INSPECTION

1.

INSPECT DISC, PLATE AND FLANGE

Check to see if the sliding surface of the disc, plate and flange
are worn or burnt.
If necessary, replace them.
HINT:

S

If the lining of the disc is peeling off or discolored, or even
if a part of the printed mark is defaced, replace all discs.

S

Before assembling new discs, soak them in ATF for at
least 15 minutes.

2.

CHECK FORWARD CLUTCH PISTON

(a)

Shake the piston to check that the check ball is not stuck.

(b)

Check that the valve does not leak when applying low
compressed air (392 kPa, 4.0 kgf/cm

2

, 57 psi).

3.

CHECK FORWARD CLUTCH PISTON RETURN
SPRING

Using a vernier calipers, measure the free length of the spring
together with the spring seat.

Standard free length: 28.23 mm (1.1114 in.)

D03829

–

AUTOMATIC TRANSAXLE

FORWARD CLUTCH

AX–69

U140F AX   (RM848E)

4.

CHECK MULTIPLE DISC CLUTCH HUB BUSHING

Using a dial indicator, measure the inside diameter of the for-
ward clutch hub bushing.

Standard inside diameter:
23.03 – 23.04 mm (0.9067 – 0.9071 in.)
Maximum inside diameter: 23.09 mm (0.9091 in.)

NOTICE:

S

When the diameter is over the maximum, replace the
multiple disc clutch hub with new one.

S

Check the contact surface of the bush in the direct
clutch shaft. If any scratch or discolor is identified, re-
place the direct clutch sub–assembly with new one.

If the inside diameter is greater than the maximum, replace the
forward clutch hub.

AX0AV–03

D03669

D03670

D03663

D03662

SST

AX–70

–

AUTOMATIC TRANSAXLE

FORWARD CLUTCH

U140F AX   (RM848E)

REASSEMBLY

1.

INSTALL FORWARD CLUTCH PISTON

(a)

Coat 2 new O–rings with ATF, and install them to the for-
ward clutch piston.

(b)

Install the forward clutch piston to the forward clutch
drum.

2.

INSTALL PISTON RETURN SPRING

(a)

Place the return spring onto the piston.

(b)

Place SST on the return spring, and compress the return
spring with a press.
SST

09350–32014 (09351–32070)

(c)

Install the snap ring with a snap ring expander. Be sure
the end gap of the snap ring is not aligned with the spring
retainer claw.

NOTICE:

S

Stop the press when the spring sheet is lowered to the
place 1 – 2 mm (0.039 – 0.078 in.) from the snap ring
groove, preventing the spring sheet from the deform-
ing.

S

Do not expand the snap ring excessively.