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 06. Low Clutch
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W1860BE.book Page 10 Tuesday, January 28, 2003 11:01 PM
LOW CLUTCH
AUTOMATIC TRANSMISSION
6. Low Clutch
A: CONSTRUCTION
The low clutch consists of a drum, a piston, return springs, a cover, drive plates, driven plates, a
one-way clutch, and other sealing and retaining elements.
The low clutch drum is made of a press-formed metal sheet. The drum's outer race and sleeve are
welded together to the drum by an electron beam welding technique.
(11)
(10)
(9)
(8)
(7)
(6)
(5)
(4)
(3)
(4)
(3)
(2)
(1)
(16)
(15)
(14)
(13)
(12) AT-00469
(1) Snap ring (7) Cover (13) Needle bearing
(2) Retaining plate (8) Return spring (14) Snap ring
(3) Drive plate (9) D-ring (15) One-way clutch
(4) Driven plate (10) Low clutch piston (16) Snap ring
(5) Dish plate (11) D-ring
(6) Snap ring (12) Low clutch drum
4AT-10
W1860BE.book Page 11 Tuesday, January 28, 2003 11:01 PM
LOW CLUTCH
AUTOMATIC TRANSMISSION
B: FUNCTION
The low clutch operates in the D range (1st, 2nd, and 3rd gears), 3 range (1st, 2nd, and 3rd gears),
2 range (2nd and 3rd gears), and 1 range (1st, 2nd, and 3rd gears).
This clutch engages when the hydraulic pressure from the transmission control valve is applied to
its piston, transmitting the power to the reduction drive shaft.
A cover is placed inside the piston, and the space between the piston and the cover is filled with
ATF. When the low clutch is not in engagement, the centrifugal force generated in the ATF inside
the cover cancels out the centrifugal force generated in the ATF remaining behind the low clutch
piston, thus preventing incomplete disengagement of the clutch.
When the low clutch is engaged, the pressure pushing the clutch piston is much larger than the
counteracting force of the ATF in the cover, so the clutch remains engaged.
(1)
(2)
(3)
(4)
AT-00470
(1) Low clutch drum (3) Return spring
(2) Low clutch piston (4) Cover
4AT-11
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