Toyota Automatic Transmission A340 Series. Repair Manual - part 11

AT5419

3.

INSTALL SECOND COAST BRAKE PISTON OIL SEAL

RING
(a)

Coat the oil seal ring with ATF.

(b)

Contract the oil seal ring once as shown in the dia-

gram, then install it in the piston groove.

NOTICE: Do not spread the ring ends more than neces-

sary.

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AUTOMATIC TRANSMISSION

Component Parts (Second Coast Brake)

AT−77

AT8187

AT4456

AT8381

Race

Race

Front Planetary Gear

Race

Bearing

Bearing

Race

Front Planetary Ring Gear

Front Planetary Gear

COMPONENTS

INSPECTION OF FRONT PLANETARY GEAR

1.

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

the planetary ring gear bushing.

Maximum inside diameter: 24.08 mm (0.9480 in.)

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

place the planetary ring gear.

2.

MEASURE PLANETARY PINION GEAR THRUST

CLEARANCE
Using a feeler gauge, measure the planetary pinion gear

thrust clearance.

Standard clearance:  0.20 − 0.60 mm

(0.0079 − 0.0236 in.)

Maximum clearance:  1.00 mm (0.0394 in.)

If the clearance is greater than the maximum, replace the

planetary gear assembly.

AT−78

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AUTOMATIC TRANSMISSION

Component Parts (Front Planetary Gear)

AT8440

Hold

Turn

Free

Lock

AT8188

AT4457

Sun Gear Input Drum

Oil Seal Ring

Snap Ring

Assembled No. 1 One−Way

Clutch and Second Brake

Hub

Snap Ring

Planetary Sun Gear

Thrust Washer

Planetary Sun Gear and No. 1 One−Way Clutch

COMPONENTS

DISASSEMBLY OF PLANETARY SUN GEAR AND

NO. 1 ONE−WAY CLUTCH

1.

CHECK OPERATION OF NO. 1 ONE−WAY CLUTCH
Hold the planetary sun gear and turn the second brake

hub. The second brake hub turns freely clockwise and

locks counterclockwise.

2.

REMOVE ASSEMBLED NO. 1 ONE−WAY CLUTCH

AND SECOND BRAKE HUB

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AUTOMATIC TRANSMISSION

Component Parts (Planetary Sun Gear 

and No. 1 One−Way Clutch)

AT−79

AT8189

AT8190

AT7897

AT8182

AT1642

3.

REMOVE THRUST WASHER FROM SUN GEAR INPUT

DRUM

4.

REMOVE OIL SEAL RINGS

5.

REMOVE SUN GEAR INPUT DRUM FROM PLAN-

ETARY SUN GEAR
(a)

Use a wooden block, etc. as work stand.

(b)

Using snap ring pliers, remove the snap ring.

(c)

Remove the sun gear input drum from the plane-

tary sun gear.

6.

REMOVE SNAP RING FROM PLANETARY SUN

GEAR

AT−80

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AUTOMATIC TRANSMISSION

Component Parts (Planetary Sun Gear 

and No. 1 One−Way Clutch)

AT8181

AT8189

AT8182

AT7897

AT8337

INSPECTION OF PLANETARY SUN GEAR

CHECK PLANETARY SUN GEAR BUSHINGS

Using a dial indicator, measure the inside diameter of

the planetary sun gear bushings.

Maximum inside diameter: 27.08 mm (1.0661 in.)

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

place the planetary sun gear.

ASSEMBLY OF PLANETARY SUN GEAR AND

NO. 1 ONE−WAY CLUTCH

1.

INSTALL SNAP RING TO PLANETARY SUN GEAR

2.

INSTALL SUN GEAR INPUT DRUM
(a)

Place a wooden block, etc. as a work stand and

place the planetary sun gear onto it.

(b)

Install the sun gear input drum onto the planetary

sun gear.

(c)

Install the snap ring with snap ring pliers.

3.

INSTALL OIL SEAL RINGS
(a)

Coat the two oil seal rings with ATF.

(b)

Install the two oil seal rings onto the planetary

sun gear.

NOTICE: Do not spread the ring ends too much.

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

rotate smoothly.

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AUTOMATIC TRANSMISSION

Component Parts (Planetary Sun Gear 

and No. 1 One−Way Clutch)

AT−81

AT1643

Upward

AT8440

Turn

Hold

Free

Lock

AT1642

4.

INSTALL THRUST WASHER
HINT: Make sure that the lug shapes match the holes

on the sun gear input drum.

5.

INSTALL ASSEMBLED NO. 1 ONE−WAY CLUTCH

AND SECOND BRAKE HUB ONTO PLANETARY SUN

GEAR AS SHOWN

6.

CHECK OPERATION OF NO. 1 ONE−WAY CLUTCH
Hold the planetary sun gear and turn the second brake

hub. The second brake hub turns freely clockwise and

locks counterclockwise.

AT−82

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AUTOMATIC TRANSMISSION

Component Parts (Planetary Sun Gear 

and No. 1 One−Way Clutch)

AT8184

AT6388

♦ Non−reusable part

Second Brake Piston

♦ O−Ring

Snap Ring

Piston Return Spring

Snap Ring

Second Brake Drum

Thrust Washer

Spring Retainer

Disc

Piston Sleeve

S SUPRA

S CRESSIDA

Plate

Disc

3VZ−E

S TRUCK

S 4 RUNNER

Piston Sleeve

Plate

Snap Ring

Second Brake

COMPONENTS

DISASSEMBLY OF SECOND BRAKE

1.

REMOVE THRUST WASHER FROM SECOND BRAKE

DRUM

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AUTOMATIC TRANSMISSION

Component Parts (Second Brake)

AT−83

AT8185

AT8196

AT6455

Printed

Number

AT8439

AT8438

SST

2.

CHECK SECOND BRAKE PISTON MOVEMENT
Make sure the second brake piston moves smoothly

when applying and releasing low−pressure compressed

air to the second brake drum.

3.

REMOVE PISTON RETURN SPRING
(a)

Place SST on the spring retainer, and compress

the return spring with a shop press.

SST

09350−30020 (09350−07040)

(b)

Using snap ring pliers, remove the snap ring.

(c)

Remove the spring retainer.

(d)

Remove the piston return spring.

4.

REMOVE SECOND BRAKE PISTON
(a)

Hold the second brake piston with hand, apply com-

pressed air to the second brake drum to remove the

second brake piston.

(b)

Remove the second brake piston.

HINT: If the piston is at an angle and cannot be removed,

press down on the side jutting out and again apply com-

pressed air, or else wind vinyl tape around the piston end

and remove it with needle−nose pliers.
(c)

Remove the two O−rings from the piston.

INSPECTION OF SECOND BRAKE

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 de-

faced, replace all discs.

S

Before assembling new discs, soak them in ATF

for at least fifteen minutes.

AT−84

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AUTOMATIC TRANSMISSION

Component Parts (Second Brake)