Subaru Legacy IV (2008 year). Manual - part 693

4AT-120

AT Main Case

AUTOMATIC TRANSMISSION

2. PLANETARY GEAR AND LOW CLUTCH

1) Apply ATF to a new D-ring, and install it to the
low clutch piston.
2) Install the low clutch piston to low clutch drum.

NOTE:
Be careful not to damage the D-ring.

3) Install the spring retainer to low clutch piston.

4) Attach the ST to the low clutch drum.
ST

498437100

LOW CLUTCH PISTON 
GUIDE

5) Using ST1, ST2 and ST3, set the cover on the
piston and press against it, and attach the snap
ring. At this time, be careful not to bend the cover
seal.
ST1

498627100

SEAT

ST2

398673600

COMPRESSOR

ST3

498437100

LOW CLUTCH PISTON 
GUIDE

6) Install the dish plate, driven plate, drive plate and
retaining plate, and then secure them with a snap
ring.

7) Check the low clutch for operation.

(1) Remove the one-way clutch. <Ref. to 4AT-
102, REMOVAL, AT Main Case.>
(2) Set the one-way clutch inner race, and apply
compressed air for checking.

(A) Low clutch piston

(B) Low clutch drum

(A) Spring retainer

(B) Low clutch drum

AT-00269

(B)

(A)

AT-00270

(A)

(B)

AT-00271

ST

(A) Snap ring

(B) Low clutch drum

(C) Dish plate

(D) Low clutch piston side

(A) Apply compressed air.

(B) Low clutch drum

AT-00272

ST2

ST3

ST1

AT-02221

(B)

(A)

(C)

(D)

AT-00274

(B)

(A)

4AT-121

AT Main Case

AUTOMATIC TRANSMISSION

8) Check the low clutch clearance.

(1) Place same thickness shims on both sides
to prevent plate from tilting.
(2) Check the clearance between retaining
plate and low clutch operation.

Initial standard:

0.7 — 1.1 mm (0.028 — 0.043 in)

Limit thickness:

1.6 mm (0.063 in)

If the clearance exceeds the service limits, re-
place the drive plate, then select and adjust the
retaining plate so that the clearance is within
default standard values.

9) Install the washer to the rear internal gear.

10) Install the rear internal gear.

11) Install the thrust needle bearing in the correct
direction.

12) Install the washer by aligning the protrusion of
the washer with the hole of the rear planetary carri-
er.

(A) Thickness gauge

(B) Low clutch drum

Retaining plate

Part No.

Thickness mm (in)

31567AB050

3.8 (0.150)

31567AB060

4.0 (0.157)

31567AB070

4.2 (0.165)

31567AB080

4.4 (0.173)

31567AB090

4.6 (0.181)

(A) Rear internal gear

(B) Washer

AT-00283

(A)

(B)

AT-00275

(A)

(B)

(A) Rear internal gear

(B) Low clutch drum

(A) Thrust needle bearing

(B) Low clutch drum

(C) Rear planetary carrier side

(D) Low clutch piston side

(A) Washer

(B) Rear planetary carrier

AT-00276

(B)

(A)

AT-02222

(B)

(D)

(C)

(A)

AT-00278

(A)

(B)

4AT-122

AT Main Case

AUTOMATIC TRANSMISSION

13) Install the rear planetary carrier to the low
clutch drum.

14) Install the thrust needle bearing in the correct
direction.

15) Install the rear sun gear in the correct direction.

16) Install the thrust needle bearing in the correct
direction.

17) Install the front planetary carrier to the low
clutch drum.

18) Install the snap ring to the low clutch drum.

(A) Rear planetary carrier

(B) Low clutch drum

(A) Rear sun gear side

(B) Rear planetary carrier side

(A) Rear sun gear

(B) Rear planetary carrier

AT-00262

(B)

(A)

AT-02223

(B)

(A)

AT-00261

(B)

(A)

(A) Thrust needle bearing

(B) Front planetary carrier

(C) Rear sun gear side

(D) Front planetary carrier side

(A) Front planetary carrier

(B) Low clutch drum

(A) Snap ring

(B) Front planetary carrier

AT-00280

(A)

(B)

(C)

(D)

AT-00260

(B)

(A)

AT-00281

(B)

(A)

4AT-123

AT Main Case

AUTOMATIC TRANSMISSION

19) Install the needle bearing, and then secure with
the snap ring.

20) Install the one-way clutch and one-way clutch
inner race, then secure with the snap ring.
21) Set the inner race. Make sure that the clutch
locks in the clockwise direction and rotates freely in
the counterclockwise direction.

3. 2-4 BRAKE

1) Apply ATF to the new D-ring, then install to the 2-
4 brake piston.
2) Install 2-4 brake piston to 2-4 brake piston re-
tainer.

NOTE:
Do not damage the D-ring. 

4. ONE-WAY CLUTCH INNER RACE

1) Install the needle bearing to inner race using ST
and a press.
ST

398497701

SEAT

2) Apply vaseline to the groove of the inner race
and to the new seal ring.
3) Install two seal rings to the one-way clutch inner
race.

(A) Needle bearing

(B) Snap ring

(A) Lock

(B) Free

(A) 2-4 brake piston

(B) 2-4 brake piston retainer

AT-00268

(B)

(A)

AT-00282

(B)

(A)

AT-00288

( A )

( B )

(A) One-way clutch inner race

(B) Seal ring

ST

AT-00299

AT-00298

(B)

(A)