Toyota Automatic Transmission A340 Series. Repair Manual - part 27

AT7918

AT7975

SST

AT1607

♦ Non−reusable part

Disc

Plate

Snap Ring

Flange

Snap Ring

Return Spring

Piston

Clutch Drum

♦ O−Ring

Transfer Front Drive Clutch

COMPONENTS

DISASSEMBLY OF TRANSFER FRONT DRIVE

CLUTCH

1.

CHECK PISTON STROKE OF TRANSFER FRONT

DRIVE CLUTCH
(a)

Install the front drive clutch onto the transfer cen-

ter support.

(b)

Place SST and a dial indicator onto the transfer

front drive clutch piston as shown in the figure.

SST

09350−30020 (09350−06120)

−

 AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Front Drive Clutch)

AT−205

AT1434

AT7973

AT1436

SST

AT1437

AT1624

(c)

Measure the piston stroke while applying and re-

leasing compressed air (4 − 8 kg/cm

2

, 57 − 114

psi or 392 − 785 kPa) as shown.

Piston stroke: 2.38 − 3.22 mm (0.0937 − 0.1268 in.)

If the values are nonstandard, inspect the discs.

2.

REMOVE FLANGE, PLATES AND DISCS
(a)

Using a screwdriver, remove the snap ring from

the clutch drum.

(b)

Remove the flange, six plates and six discs.

3.

REMOVE PISTON RETURN SPRING
(a)

Place SST on the return spring and compress the

spring with a shop press.

SST

09320−89010

(b)

Using snap ring pliers, remove the snap ring.

(c)

Remove the piston return spring.

4.

REMOVE TRANSFER FRONT DRIVE CLUTCH PISTON
(a)

Place the front drive clutch on the transfer center

support.

(b)

Hold the front drive clutch piston with hand, apply

compressed air to the center support to remove the

piston.

(c)

Remove the front drive clutch piston.

(d)

Remove the O−rings from the piston.

AT−206

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Front Drive Clutch)

AT1511

AT7973

Flange

AT4574

AT1436 AT4918

Retainer

Claw

SST

E7119

Printed

Number

INSPECTION OF TRANSFER FRONT DRIVE

CLUTCH

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 parts of the printed numbers are defaced,

replace all discs.

S

Before assembling new discs, soak them in ATF for

at least fifteen minutes.

2.

CHECK FRONT DRIVE CLUTCH PISTON
(a)

Check that check ball is free by shaking the piston.

(b)

Check that the valve does not leak by applying

low−pressure compressed air.

ASSEMBLY OF TRANSFER FRONT DRIVE

CLUTCH

1.

INSTALL PISTON TO TRANSFER FRONT DRIVE

CLUTCH DRUM
(a)

Coat new O−rings with ATF and install them on the

piston.

(b)

Being careful not to damage the O−rings, press the

piston into the drum with both hands.

2.

INSTALL PISTON RETURN SPRING
(a)

Install the piston return spring.

(b)

Place SST on the return spring, and compress the

spring with a shop press.

SST

09320−89010

(c)

Install the snap ring with snap ring pliers. Be sure

the end gap of the snap ring is not aligned with

the spring retainer claw.

3.

INSTALL PLATES, DISCS AND FLANGE
(a)

Install the plates and discs.

Install in order: P = Plate D = Disc

P−D−P−D−P−D−P−D−P−D−P−D

(b)

Install the flange, the rounded edge facing down-

ward.

−

 AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Front Drive Clutch)

AT−207

AT1624

SST

AT1438

(c)

Install the snap ring with a screwdriver.

4.

CHECK PISTON STROKE OF TRANSFER FRONT

DRIVE CLUTCH
(a)

Install the front drive clutch onto the transfer center

support.

(b)

Using SST and a dial indicator, measure the piston

stroke applying and releasing the compressed air (4

− 8 kg/cm

2

, 57 − 114 psi or 392 − 785 kPa) as

shown.

SST

09350−30020 (09350−06120)

Piston stroke: 2.38 − 3.22 mm (0.0937 − 0.1268 in.)

If the piston stroke is less than the limit, parts may have

been assembled incorrectly, check and reassemble

again.

AT−208

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Front Drive Clutch)

AT4922

AT1477

AT4921

♦ Non−reusable part

: Specified torque

kg−cm (ft−lb, N−m)

Lower Valve Body

Manual Valve

♦ No.2 Gasket

100 (7, 10)

70 (61 in.−lb, 6.9)

No. 4

Solenoid

70 (61 in.−lb, 6.9)

Detent Spring

♦ O−Ring

Oil Strainer

♦ No.1 Gasket

Plate

♦ No.2 Gasket

(w/ A.D.D.)

Transfer Pressure

Switch

Check Ball

Upper Valve Body

70 (61 in.−lb, 6.9)

Center Valve Body

Plate

♦ No.1 Gasket

COMPONENTS

Transfer Valve Body

(Disassembly of Transfer Valve Body)

1.

REMOVE NO. 4 SOLENOID
(a)

Remove the bolt and No. 4 solenoid.

(b)

Remove the O−ring from the solenoid.

2.

(w/ A.D.D.)

REMOVE TRANSFER PRESSURE SWITCH

3.

REMOVE MANUAL VALVE

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Valve Body)

AT−209

AT4923

AT1500

AT1479

AT1502

AT1478

4.

REMOVE DETENT SPRING

5.

REMOVE EIGHT BOLTS FROM UPPER VALVE BODY

6.

TURN ASSEMBLY OVER AND REMOVE TEN BOLTS

FROM LOWER AND CENTER VALVE BODIES

7.

LIFT OFF LOWER VALVE BODY
(a)

Remove the lower valve body.

(b)

Remove the plate and two gaskets.

8.

LIFT OFF CENTER VALVE BODY
(a)

Remove the center valve body.

(b)

Remove the plate and two gaskets.

AT−210

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Valve Body)

Spring

Free length

mm (in.)

Coil outer diameter

mm (in.)

Total No. of coils

Color

Direct clutch 

accumulator valve

55.7 (2.193)

18.3 (0.720)

11.1

Blue

ND0049

AT1486

Direct Clutch

Accumulator Valve

Retainer

Spring

Plug

COMPONENTS

(Upper Valve Body)

SPECIFICATIONS OF VALVE BODY SPRING

SECTIONAL VIEW OF VALVE BODY

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Valve Body)

AT−211

AT7935

Rubber ball

5.54 (0.2181)

Check ball

Diameter       mm (in.)

Ball

AT5064

Retainer

Height

Width

Thickness

Direct clutch accumulator valve

9.5

(0.374)

9.5

(0.374)

3.2

(0.126)

AT7934

mm (in.)

Retainer

LOCATION OF RETAINER, CHECK BALLS AND STRAINERS

1.

RETAINER

2.

CHECK BALL

3.

STRAINER

AT−212

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Valve Body)