Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Automatic Transmission and Differential MSA5TCD00L18195

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MSA5TCD00L18195


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                      LEGACY (W2260BE_SGML Complete)



                                            MECHANISM AND FUNCTION                                            [M8A0]     3-2
                                                                                                               8. Power Train


8. Power Train
A: CONSTRUCTION
The gear train consists of two sets of planetary gears, three sets of multi-plate clutches, two sets
of multi-plate brakes and one set of one-way clutch.




                                                                                                                      B3H0929A

  (1)   Input shaft                                           (7) One-way clutch           (13) Rear sun gear
  (2)   High clutch (Operates at 3rd and 4th speeds.)         (8) Free/Locked              (14) Front planetary carrier
  (3)   Reverse clutch (Operates while moving in reverse.)    (9) Rear planetary carrier   (15) Front internal gear
  (4)   2-4 brake                                            (10) Reduction drive shaft    (16) Front pinion gear
  (5)   Low clutch                                           (11) Rear internal gear       (17) Front sun gear
  (6)   Low & reverse brake                                  (12) Rear pinion gear




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                 LEGACY (W2260BE_SGML Complete)



3-2     [M8B0]           MECHANISM AND FUNCTION
8. Power Train


B: OPERATION TABLE




                                                  B3H0998A




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       LEGACY (W2260BE_SGML Complete)



                       MECHANISM AND FUNCTION   3-2


MEMO




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                           LEGACY (W2260BE_SGML Complete)



3-2     [M8C0]                        MECHANISM AND FUNCTION
8. Power Train


C: N RANGE
Since the rear sun gear and the high clutch drum are in mesh with the input shaft, they rotate to-
gether with input shaft.
The high clutch drum does not transmit the rotation torque to the planetary unit since the reverse
clutch and the high clutch are in the free state.
The rotation torque of the rear sun gear is transmitted to the rear internal gear through the pinion
gear.
However, the rotation torque of the rear sun gear is not transmitted to the rear planetary carrier
since the rear internal gear idles because of disengaged low clutch.
Accordingly, the rotation torque of the input shaft is not transmitted to the reduction drive shaft.

                 Operating condition of parts                   Power flow (in acceleration)

All clutches and brakes are free




                                                                                               S3H0192B




                                                     18
             LEGACY (W2260BE_SGML Complete)



                             MECHANISM AND FUNCTION                                 [M8C0]     3-2
                                                                                     8. Power Train




                                                                                         B3H0930A


(1) Input shaft                   (7) One-way clutch           (13) Rear sun gear
(2) High clutch                   (8) No effect                (14) Input
(3) Reverse clutch                (9) Rear planetary carrier   (15) Output
(4) 2-4 brake                    (10) Reduction drive shaft    (16) Locked
(5) Low clutch                   (11) Rear internal gear       (17) Component
(6) Low & reverse brake          (12) Rear pinion gear




                                                  19
                           LEGACY (W2260BE_SGML Complete)



3-2     [M8D0]                        MECHANISM AND FUNCTION
8. Power Train


D: P RANGE
All controls do not operate, just as in the N range. The parking pawl locks the power train by pawl-
ing the parking gear which is integrated with the reduction drive gear.

                 Operating condition of parts                   Power flow (in acceleration)

All clutches and brakes are free




                                                                                               S3H0193B




                                                     20
             LEGACY (W2260BE_SGML Complete)



                             MECHANISM AND FUNCTION                                 [M8D0]     3-2
                                                                                     8. Power Train




                                                                                         B3H0930A


(1) Input shaft                   (7) One-way clutch           (13) Rear sun gear
(2) High clutch                   (8) No effect                (14) Input
(3) Reverse clutch                (9) Rear planetary carrier   (15) Output
(4) 2-4 brake                    (10) Reduction drive shaft    (16) Locked
(5) Low clutch                   (11) Rear internal gear       (17) Component
(6) Low & reverse brake          (12) Rear pinion gear




                                                  21
                          LEGACY (W2260BE_SGML Complete)



3-2     [M8E0]                        MECHANISM AND FUNCTION
8. Power Train


E: FIRST SPEED OF D OR 3 RANGE (D1, 31)
At 1st speed of these ranges, only the low clutch is in engagement. The rear internal gear which
rotates idlly in P and N ranges tries to rotate counterclockwise due to engaged low clutch. Howev-
er, this is blocked by the one-way clutch and secured to the transmission case.
Therefore, the rotation of the rear sun gear is converted to the revolution of the pinion gears around
the sun gear, causing the planetary carrier to rotate. In this way, the rotation of the input shaft is
transmitted to the reduction drive shaft after subjected to speed reduction by the planetary gear.
On the other hand, the rear internal gear rotates clockwise if the reverse driving force is applied
from the reduction drive shaft during coasting. This rotation frees the one-way clutch. Accordingly,
since the connection between the reduction drive shaft and the input shaft is lost, the engine brak-
ing effect is not available.

                 Operating condition of parts                    Power flow (in acceleration)

Low clutch                   : Engaged
One-way clutch               : Operating




                                                                                                S3H0194B




                                                    22
             LEGACY (W2260BE_SGML Complete)



                             MECHANISM AND FUNCTION                                 [M8E0]     3-2
                                                                                     8. Power Train




                                                                                         B3H0931A


(1) Input shaft                   (7) One-way clutch           (13) Rear sun gear
(2) High clutch                   (8) Locked                   (14) Input
(3) Reverse clutch                (9) Rear planetary carrier   (15) Output
(4) 2-4 brake                    (10) Reduction drive shaft    (16) Locked
(5) Low clutch                   (11) Rear internal gear       (17) Component
(6) Low & reverse brake          (12) Rear pinion gear




                                                  23
                           LEGACY (W2260BE_SGML Complete)



3-2     [M8F0]                        MECHANISM AND FUNCTION
8. Power Train


F: SECOND SPEED OF D, 3 OR 2 RANGE (D2, 32, 22)
At 2nd speed, the 2-4 brake as well as the low clutch is in engagement. In addition to the elements
operating at 1st speed, the front sun gear which idles at 1st speed is connected to the transmission
case because of engaged 2-4 brake. In this state, the rotation torque of the rear sun gear is trans-
mitted to the rear internal gear through the front internal gear, front pinion gears, low clutch drum
and low clutch. At this time, the one-way clutch is free since the low clutch drum rotates clockwise.
For this reason, the rotation speed is higher than that at 1st gear by an amount of rear internal gear
rotation speed.
At 2nd speed, the driving power is transmitted without being affected by the one-way clutch.
Therefore, the back driving force from the reduction drive shaft is transmitted to the input shaft,
thus the engine braking effect being available.

             Operating condition of parts                    Power flow (in acceleration)

Low clutch                    : Engaged
2-4 brake                     : Engaged




                                                                                             S3H0195B




                                                     24
             LEGACY (W2260BE_SGML Complete)



                             MECHANISM AND FUNCTION                                     [M8F0]     3-2
                                                                                         8. Power Train




                                                                                             B3H0932A


(1) Input shaft                   (8) Free                     (15) Front pinion gear
(2) High clutch                   (9) Rear planetary carrier   (16) Front sun gear
(3) Reverse clutch               (10) Reduction drive shaft    (17) Input
(4) 2-4 brake                    (11) Rear internal gear       (18) Output
(5) Low clutch                   (12) Rear pinion gear         (19) Locked
(6) Low & reverse clutch         (13) Rear sun gear            (20) Component
(7) One-way clutch               (14) Front internal gear




                                                  25
                       LEGACY (W2260BE_SGML Complete)



3-2     [M8G0]                     MECHANISM AND FUNCTION
8. Power Train


G: THIRD SPEED OF D OR 3 RANGE (D3, 33)
At 3rd speed, the low clutch and the high clutch are thrown into engagement. With the high clutch
engaged, the high clutch drum rotates, which is turn rotates the rear internal gear through the front
planetary carrier, low clutch drum and low clutch. This means that the rear sun gear and the rear
internal gear rotates at the same speed. That is, the rear pinion gears stop rotation on its axis and
resolve around the sun gear as a planetary assembly.
As a result, the input shaft and the reduction drive shaft rotate at the same speed.
The one-way clutch is released because the low clutch rotates clockwise. Since the driving power
is transmitted without being affected by the one-way clutch, the back driving force from the reduc-
tion drive shaft is transmitted to the input shaft, thus the engine braking effect being available.

              Operating condition of parts                      Power flow (in acceleration)

High clutch               : Engaged
Low clutch                : Engaged




                                                                                               S3H0196B




                                                 26
             LEGACY (W2260BE_SGML Complete)



                              MECHANISM AND FUNCTION                                 [M8G0]     3-2
                                                                                      8. Power Train




                                                                                          B3H0933A


(1) Input shaft                   (8) One-way clutch           (15) Front internal gear
(2) High clutch                   (9) Free                     (16) Front pinion gear
(3) Reverse clutch               (10) Rear planetary carrier   (17) Front sun gear
(4) 2-4 brake                    (11) Reduction drive shaft    (18) Input
(5) Front planetary carrier      (12) Rear internal gear       (19) Output
(6) Low clutch                   (13) Rear pinion gear         (20) Locked
(7) Low & reverse brake          (14) Rear sun gear            (21) Component




                                                  27
                       LEGACY (W2260BE_SGML Complete)



3-2     [M8H0]                     MECHANISM AND FUNCTION
8. Power Train


H: FOURTH SPEED OF D RANGE (D4)
At 4th speed, the high clutch and the 2-4 brake are thrown into engagement. The engaged high
clutch causes the front planetary carrier to rotate. The engaged 2-4 brake causes the front sun
gear which idles at 3rd speed to be locked.
The front planetary carrier rotates at the same speed as the input shaft. The rotation of the front
planetary carrier causes the front pinion gears to revolve around the stationary front sun gear,
which causes the front internal gear to rotate faster than the input shaft.
As a result, the reduction drive shaft is driven at a higher speed than the input shaft.
The one-way clutch is free because the low clutch rotates clockwise. Since the driving power is
transmitted without being affected by the one-way clutch, the back driving force from the reduction
drive shaft is transmitted to the input shaft, thus the engine braking effect being available.

              Operating condition of parts                     Power flow (in acceleration)

2-4 brake                 : Engaged
High clutch               : Engaged




                                                                                              S3H0197B




                                                 28
             LEGACY (W2260BE_SGML Complete)



                              MECHANISM AND FUNCTION                                    [M8H0]     3-2
                                                                                         8. Power Train




                                                                                             B3H0934A


(1) Input shaft                   (8) One-way clutch           (15) Front internal gear
(2) High clutch                   (9) Free                     (16) Front pinion gear
(3) Reverse clutch               (10) Rear planetary carrier   (17) Front sun gear
(4) 2-4 brake                    (11) Reduction drive shaft    (18) Input
(5) Front planetary carrier      (12) Rear internal gear       (19) Output
(6) Low clutch                   (13) Rear pinion gear         (20) Locked
(7) Low & reverse brake          (14) Rear sun gear            (21) Component




                                                  29
                          LEGACY (W2260BE_SGML Complete)



3-2     [M8I0]                        MECHANISM AND FUNCTION
8. Power Train


I: FIRST SPEED OF 1 RANGE
At 1st speed of this range, the low clutch and the low & reverse brake are thrown into engagement.
The 1st speed in this range shows the same operation as the 1st speed in the D or 3 range. Howev-
er, the one-way clutch produces no effect because the low & reverse brake is operated.
The rear internal gear is always interlocked with the transmission case by the engaged low & re-
verse brake.
During coasting, therefore, the back driving force from the reduction drive gear is transmitted to
the input shaft. This means, unlike the 1st speed in D or 3 range, that the engine braking effect
is available in this range.

                 Operating condition of parts                 Power flow (in acceleration)

Low clutch                   : Engaged
Low & reverse brake          : Engaged
One-way clutch               : Operating




                                                                                             S3H0198B




                                                    30
             LEGACY (W2260BE_SGML Complete)



                              MECHANISM AND FUNCTION                                    [M8I0]    3-2
                                                                                        8. Power Train




                                                                                            B3H0936A


(1) Input shaft                   (8) One-way clutch           (15) Front internal gear
(2) High clutch                   (9) No effect                (16) Front pinion gear
(3) Reverse clutch               (10) Rear planetary carrier   (17) Front sun gear
(4) 2-4 brake                    (11) Reduction drive shaft    (18) Input
(5) Front planetary carrier      (12) Rear internal gear       (19) Output
(6) Low clutch                   (13) Rear pinion gear         (20) Locked
(7) Low & reverse brake          (14) Rear sun gear            (21) Component




                                                  31
                          LEGACY (W2260BE_SGML Complete)



3-2     [M8J0]                        MECHANISM AND FUNCTION
8. Power Train


J: R RANGE
In "R" range, the reverse clutch and the low & reverse brake are thrown into engagement. The en-
gaged reverse clutch allows the front sun gear to rotate, while the engaged low & reverse brake
allows the low clutch drum to be interlocked with the transmission case.
The rotation of the input shaft causes the front sun gear to rotate, which in turn causes the front
pinion gears to rotate in the reverse direction. Thus, the rotation torque of the input shaft is trans-
mitted to the front internal gear.
At this time, the rotation speed transmitted to the front internal gear is reduced by the front sun gear
and the front pinion gears.
The one-way clutch produces no effect because the low & reverse brake is in engagement.
In this range, since the power transmission is made without influence of the one-way clutch, the
back driving force from the reduction drive shaft is transmitted to the input shaft, thus the braking
effect of the engine being available.

                 Operating condition of parts                     Power flow (in acceleration)

Reverse brake                : Engaged
Low & reverse brake          : Engaged




                                                                                                 S3H0199B




                                                    32
             LEGACY (W2260BE_SGML Complete)



                              MECHANISM AND FUNCTION                                    [M8J0]     3-2
                                                                                         8. Power Train




                                                                                             B3H0935A


(1) Input shaft                   (8) One-way clutch           (15) Front internal gear
(2) High clutch                   (9) No effect                (16) Front pinion gear
(3) Reverse clutch               (10) Rear planetary carrier   (17) Front sun gear
(4) 2-4 brake                    (11) Reduction drive shaft    (18) Input
(5) Front planetary carrier      (12) Rear internal gear       (19) Output
(6) Low clutch                   (13) Rear pinion gear         (20) Locked
(7) Low & reverse brake          (14) Rear sun gear            (21) Component




                                                  33



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