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Toyota Automatic Transmission A340 Series. Repair Manual - part 26

AT1508

AT1429

AT1510

SST

AT1430

AT1622

(c)

Measure the piston stroke while applying and re-

leasing the compressed air (4 − 8 kg /cm

, 57 −

114 psi or 392 − 785 kPa) as shown.

Piston stroke: 2.28 − 2.68 mm (0.0898 − 0.1055 in.)

If the values are nonstandard, inspect the discs.

REMOVE FLANGE, PLATES AND DISCS
(a)

Remove the snap ring from the clutch drum.

(b)

Remove the flange, six plates and six discs.

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.

REMOVE TRANSFER DIRECT CLUTCH PISTON
(a)

Place the direct clutch on the transfer front support.

(b)

Hold the transfer direct clutch piston with hand, ap-

ply compressed air to the front support to remove

the piston.

Remove the two O−rings from the piston and an O−

ring from the drum.

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Direct Clutch)

AT−197

AT7905

AT4957

AT7920

AT4849

SST

Printed

Number

E7119

INSPECTION OF TRANSFER DIRECT CLUTCH

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:

If the lining of the disc is peeling off or discolored,

or even if parts of the printed numbers are defaced,

replace all discs.

Before assembling new discs, soak them in ATF for

at least fifteen minutes.

CHECK TRANSFER DIRECT 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.

CHECK TRANSFER DIRECT CLUTCH DRUM CHECK

BALL
Check that check ball is free by shaking the drum.

CHECK TRANSFER DIRECT CLUTCH DRUM BUSHING
Using a dial indicator, measure the inside diameter of the

clutch drum bushing.

Maximum inside diameter: 47.65 mm (1.8760 in.)

If the inside diameter is greater than the maximum, re-

place the clutch drum.

ASSEMBLY OF TRANSFER DIRECT CLUTCH

INSTALL PISTON TO TRANSFER DIRECT CLUTCH

DRUM
(a)

Coat new O−rings with ATF and install them on

the piston and drum.

(b)

Place SST on the transfer direct clutch piston.

SST

09320−89010

(c)

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

piston into the drum with plastic hammer.

AT−198

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Direct Clutch)

AT1930

Thick

Plate

Disc

Thin

Plate

Flange

AT1509

AT1622

SST

3.9 (0.154)

4.3 (0.169)

4.1 (0.161)

4.5 (0.177)

AT1510 AT4918

Retainer

Claw

SST

Flange thickness

mm (in.)

INSTALL PISTON RETURN SPRING
(a)

Install the piston return spring.

(4)

Place SST on the spring retainer, 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.

INSTALL PLATES, DISCS AND FLANGE
(a)

Install the plates and discs.

Install in order: P = Plate D = Disc

P (Thick)−D−P (Thin)−D−P (Thin)−

D−P (Thin)−D−P (Thin)−D−P (Thin)−D

(b)

Install the flange, the flat end facing downward.

(c)

Install the snap ring with a screwdriver.

CHECK PISTON STROKE OF TRANSFER DIRECT

CLUTCH
(a)

Install the direct clutch onto the transfer front sup-

port.

Using SST and a dial indicator, measure the piston

stroke applying and releasing the compressed air (4

−8 kg /cm

, 57 − 114 psi or 392 − 785 kPa) as

shown.

SST

09350−30020 (09350−06120)

Piston stroke: 2.28 − 2.68 mm (0.0898 − 0.1055 in.)

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

been assembled incorrectly, check and reassemble

again.

If the piston stroke is nonstandard, select another flange.

HINT: There are four different thicknesses for the flange.

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Direct Clutch)

AT−199

AT1497

AT1491

AT3196

♦ Non−reusable part

Bearing

Piston Return Spring

Piston

♦ O−Ring

Center Support

Plate

Ring Gear Flange

Cushion

Plate

Disc

Bearing

Rear Flange

Planetary Gear and

Output Shaft

Race

Planetary

Ring Gear

Snap Ring

Race

Oil Seal Ring

Front Flange

Transfer Low Speed Brake and Center Support

COMPONENTS

DISASSEMBLY OF TRANSFER LOW SPEED

BRAKE AND CENTER SUPPORT

REMOVE TRANSFER CENTER SUPPORT
(a)

Remove the center support from the output shaft.

(b)

Remove the assembled bearing and race from the

center support.

AT−200

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Low Speed

Brake and Center Support)

AT1493

AT1494

AT1498

AT1492

AT1619

(c)

Remove the race from the output shaft.

REMOVE PISTON RETURN SPRING

REMOVE CUSHION PLATE, REAR FLANGE, PLATES

AND DISCS
Remove the cushion plate, rear flange, six plates and

seven discs.

REMOVE PLANETARY RING GEAR FROM OUTPUT

SHAFT

REMOVE RACE AND BEARING FROM PLANETARY

GEAR
Remove the race and bearing from rear side of the

planetary gear.

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Low Speed

Brake and Center Support)

AT−201

E7119

Printed

Number

AT1618

AT1616

AT1495

AT4919

REMOVE PLANETARY RING GEAR FLANGE
Remove the snap ring and ring gear flange.

REMOVE TRANSFER LOW SPEED BRAKE PISTON
(a)

Hold the low speed brake piston with hand, apply

compressed air into the center support and remove

the piston.

(b)

Remove the two O−rings from the piston and an

O−ring from the center support.

REMOVE OIL SEAL RINGS FROM CENTER SUPPORT
Push one end of the ring into the groove and unhook both

ends of the ring by hands. Spread the ring apart and re-

move it.

INSPECTION OF TRANSFER LOW SPEED BRAKE

AND CENTER SUPPORT

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:

If the lining of the disc is peeling off or discolored,

or even if parts of the printed numbers are de-

faced, replace all discs.

Before assembling new discs, soak them in ATF

for at least fifteen minutes.

CHECK CENTER SUPPORT
(a)

Check that check balls are free by shaking the

center support.

(b)

Check that the valve does not leak by applying

low−pressure compressed air.

AT−202

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Low Speed

Brake and Center Support)

AT1676

AT4851

AT4332

AT1618

AT4850

CHECK CENTER SUPPORT BUSHING
Using a dial indicator, measure the inside diameter of

the center support bushing.

Maximum inside diameter: 35.08 mm (1.3811 in.)

If the inside diameter is greater than the maximum, re-

place the center support.

CHECK RING GEAR FLANGE BUSHING
Using a dial indicator, measure the inside diameter of the

ring gear flange bushing.

Maximum inside diameter: 35.08 mm (1.3811 in.)

If the inside diameter is greater than maximum, replace

the flange.

CHECK PLANETARY GEAR BUSHING
Using a dial indicator, measure the inside diameter of

the planetary gear bushing.

Maximum inside diameter: 18.08 mm (0.7118 in.)

If the inside diameter is greater than the maximum, re-

place the planetary gear.

MEASURE PLANETARY PINION GEAR THRUST

CLEARANCE
Using a feeler gauge, measure the planetary pinion gear

thrust clearance.

Standard clearance:

0.30 − 0.60 mm

(0.0118 − 0.0236 in.)

Maximum clearance: 1.00 mm (0.0394 in.)

If the clearance is greater than the maximum, replace the

planetary gear assembly.

ASSEMBLY OF TRANSFER LOW SPEED BRAKE

AND CENTER SUPPORT

INSTALL OIL SEAL RINGS TO CENTER SUPPORT
(a)

Coat the two oil seal rings with ATF.

(b)

Spread the ring apart and install it into the groove

on the center support.

NOTICE: Do not spread the ring ends too much.
(c)

Push the one end of the ring into the groove and

hook both ends with hands.

HINT: After installing the oil seal rings, check that they

rotate smoothly.

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Low Speed

Brake and Center Support)

AT−203

AT4920

AT3197

AT1494

Inside

Outside

Bearing

35.0 (1.378)

54.4 (2.142)

Race

36.3 (1.429)

53.9 (2.122)

AT1506

mm (in.)

INSTALL TRANSFER LOW SPEED BRAKE PISTON

TO CENTER SUPPORT
(a)

Coat new O−rings with ATF and install them on

the piston and center support.

(b)

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

the low speed brake piston into the center support

with both hands.

INSTALL PLANETARY RING GEAR FLANGE
Install the flange into the ring gear and install the snap

ring.

INSTALL BEARING AND RACE TO PLANETARY GEAR
Coat the bearing and race with petroleum jelly and install

them onto the planetary gear.

HINT: Bearing and race diameter

INSTALL PLANETARY RING GEAR TO OUTPUT SHAFT

AT−204

−

AUTOMATIC TRANSMISSION (A340H)

Component Parts (Transfer Low Speed

Brake and Center Support)

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