Lexus ES300 (2002 year). Service manual — part 119

CHASSIS – U150E AUTOMATIC TRANSAXLE

CH-5

211CH03

U150E

U140E

Front Planetary
Gear

Counter Drive Gear

Input Shaft

Rear Planetary Gear

Sun Gear

Intermediate Shaft

Differential Drive
Pinion

Sun Gear

U / D Planetary Gear

Ring Gear

Counter Driven Gear

B

1

F

1

B

2

C

0

C

2

C

1

C

3

F

2

B

3

Front Planetary
Gear

Counter Drive Gear

Input Shaft

Rear Planetary Gear

Sun Gear

Intermediate Shaft

Differential Drive
Pinion

Sun Gear

Ring Gear

U / D Planetary Gear

Counter Driven Gear

B

1

F

1

B

2

C

1

C

2

C

3

F

2

B

3

208CH04

PLANETARY GEAR UNIT

1. Construction

The gear layout of the U150E A/T is the same as that of the U140E A/T.

The counter drive and driven gears are placed in front of the front planetary gear and the under drive (U/ D)
planetary gear unit is placed above the counter shaft. Furthermore, the force transmission method has been
changed by eliminating the brake and the one-way clutch. As a result, a torque capacity that accommodates
the high output engine has been attained, while realizing a compact gear unit.

A centrifugal fluid pressure canceling mechanism has been adopted in the C

0

, C

2

, C

3

, and C

1

clutches that

are applied when shifting from 2nd to 3rd and from 3rd to 4th. For detail, refer to CH-12.

– Changes (from U140E) –

Direct & O/D clutch (C

0

) has been adopted.

A centrifugal fluid pressure canceling mechanism has been adopted in the C

0

clutch that is applied when

shifting from 4th to 5th.

The operating gears for the C

2

clutch and the B

1

brake have been changed, and their names have been

changed to the “reverse clutch” and “2nd & O / D brake”, respectively.

CHASSIS – U150E AUTOMATIC TRANSAXLE

CH-6

2. Function of Component

Component

Function

U150E U140E

C

1

Forward Clutch

Connects input shaft and front planetary sun gear.

C

Direct Clutch

Connects input shaft and rear planetary sun gear

—

C

2

Reverse Clutch

Connects input shaft and rear planetary sun gear.

—

C

3

U / D Direct Brake

Connects U / D sun gear and U / D planetary carrier.

C

0

Direct & O / D Clutch

Connects input shaft and rear planetary carrier.

—

B

2nd Brake

Prevents rear planetary sun gear from turning either

—

B

1

2nd & O / D Brake

Prevents rear planetary sun gear from turning either
clockwise or counterclockwise.

—

B

2

1st & Reverse Brake

Prevents rear planetary carrier from turning
counterclockwise.

B

3

U / D Brake

Prevents U / D planetary sun gear from turning
clockwise.

F

1

No.1 One-Way Clutch

Prevents rear planetary carrier from turning
counterclockwise.

F

2

U / D One-Way Clutch

Prevents U / D planetary sun gear from turning
clockwise.

Planetary Gears

These gears change the route through which driving
force is transmitted, in accordance with the
operation of each clutch and brake, in order to
increase or reduce the input and output speed.

CHASSIS – U150E AUTOMATIC TRANSAXLE

CH-7

3. Motive Power Transaxle

Shift

Solenoid Valve

Clutch

Brake

One-way

Shift
Lever

Gear

Solenoid Valve

Clutch

Brake

One-way

Clutch

Lever
Position

Gear

S4

SR

DSL

SL1

SL2

SL3

C

0

C

1

C

2

C

3

B

1

B

2

B

3

F

1

F

2

P

Park

R

Reverse

N

Neutral

1st

2nd

D

3rd

4th

5th

1st

4

2nd

4

3rd

4th

1st

3

2nd

3rd

2

1st

2

2nd

L

1st

: ON : Lock-up ON

CHASSIS – U150E AUTOMATIC TRANSAXLE

CH-8

161ES09

U150E

U140E

Front Planetary Gear

Counter Drive Gear

Rear Planetary Gear

Input Shaft

Sun Gear

Intermediate Shaft

Differential Drive
Pinion

Sun Gear

U / D Planetary Gear

Ring Gear

B

1

F

1

B

2

C

0

C

2

C

1

C

3

F

2

B

3

211CH04

U150E

U140E

Counter Drive Gear

Front Planetary Gear

Input Shaft

Rear Planetary Gear

Sun Gear

Intermediate Shaft

Differential Drive
Pinion

Sun Gear

U / D Planetary Gear

Ring Gear

B

1

F

1

B

2

C

0

C

2

C

1

C

3

F

2

B

3

211CH05

211CH57

1st Gear (Except L Position)

2nd Gear