The internal-splined clutch plates, driven by the fourth clutch drive
hub, rotate whenever the forward clutch housing assembly rotates.
Applying hydraulic pressure to the back of the fourth clutch piston
causes the piston to press the clutch plates together.
This locks
the internal-splined plates to the external-splined plates and to the
fourth clutch housing.
Since the sun gear assembly attaches to the
clutch housing through splines, it rotates at input speed also.
g. The Third Clutch (fig. 1-13). This clutch performs only one
function. Applying this clutch with the forward clutch produces the
third range.
The third clutch contains a piston, internal and external-tanged
clutch plates, and a center diaphragm.
Through the use of splines,
the internal-splined clutch plates attach to the inside diameter of
the fourth clutch housing, and the external-tanged clutch plates
anchor against the transmission housing.
Applying hydraulic pressure, through the oil passages in the center
diaphragm to the back side of the clutch piston, causes the piston to
move and compress the clutch plates together. When the clutch plates
lock together, they lock the fourth clutch housing to the
transmission housing, which prevents the housing and attached
components from rotating.
The application of the forward and third
clutch causes a reaction, within the planetary gearing, that produces
rotation of the range output gear.
h. The Second Clutch (fig. 1-13).
The second clutch has two
functions.
It produces the second forward range when engaged with
the forward clutch and the second reverse range when engaged the
fourth clutch.
The second clutch consists of internal-splined and external-tanged
clutches and a piston housed in the first and second piston housing.
The transmission housing holds the external-tanged clutch plates; the
internal-tanged clutch plates attach to the front planetary carrier,
through splines.
Releasing the second clutch allows the internal-splined plates to
rotate freely.
This also allows the front planetary carrier to
rotate freely, since it attaches to the internal-splined clutch
plates.
Applying hydraulic pressure to the back of the piston causes it to
move and press the clutch plates together.
This locks the rotating
(internal-splined) plates to the stationary (external-tanged) plates,
stopping the carrier from rotating.
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