Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 33. AUTOMATIC TRANSMISSION 02. Reverse Clutch
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W1860BE.book Page 4 Tuesday, January 28, 2003 11:01 PM
REVERSE CLUTCH
AUTOMATIC TRANSMISSION
2. Reverse Clutch
A: CONSTRUCTION
(4)
(3)
(2)
(1)
(11)
(10)
(9)
(8)
(7)
(6)
(7)
(6)
(5)
AT-00463
(1) High clutch drum (7) Drive plate
(2) Lip seal (8) Retaining plate
(3) D-ring (9) Snap ring
(4) Reverse clutch piston (10) Thrust needle bearing
(5) Dish plate (11) High clutch hub
(6) Driven plate
4AT-4
W1860BE.book Page 5 Tuesday, January 28, 2003 11:01 PM
REVERSE CLUTCH
AUTOMATIC TRANSMISSION
B: FUNCTION
1. WHEN REVERSE IS SELECTED
Hydraulic pressure from the hydraulic control valve is applied to the reverse clutch piston when a
shift is made into the reverse. The drive and driven plates are pressed together by this pressure, so
that the engine torque from the high clutch drum is transmitted to the front sun gear through the 2-
4 brake hub.
(1) (2) (3) (4)
(5) AT-00464
(1) High clutch drum (4) Drive plate
(2) Reverse clutch piston (5) Front sun gear
(3) Driven plate
4AT-5
W1860BE.book Page 6 Tuesday, January 28, 2003 11:01 PM
REVERSE CLUTCH
AUTOMATIC TRANSMISSION
2. WHEN REVERSE IS NOT SELECTED
When the selector lever is in any position other than the reverse, no pressure is applied to the re-
verse clutch piston. Hence the drive and driven plates are separated from each other, transmitting
no power to any element beyond them.
A check ball is built into the clutch piston. This check ball has a function of releasing the pressure
which may build up in the fluid remaining behind the piston by centrifugal force generated by the idly
rotating high clutch drum, thereby avoiding a half-engaged state of the clutch.
(1) (2) (3) (4)
(7)
(6) (5)
AT-00465
(1) High clutch drum (5) Front sun gear
(2) Reverse clutch piston (6) Cover
(3) Driven plate (7) Check ball
(4) Drive plate
4AT-6
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