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POWER TRAIN
-
Automatic Transaxle
The overdrive clutch is the center clutch in the input
clutch assembly. The clutch pack is held on the
retainer, and the piston that applies the clutch is
located around the outside of the retainer. A pressure
plate in the rear of the clutch pack is used to com-
press the overdrive clutch when needed. Line pres-
sure from the valve body is directed through pas-
sages in the case, oil pump housing and reaction
shaft support. It is then directed through the input
hub and input clutch retainer to the back side of
Reverse Clutch
Hub
the
OD/REV
clutch piston. The pressure pushes
the piston forward and applies the overdrive clutch.
The clutch pack is compressed against the same
reaction plate that the underdrive clutch uses.
When applied, the overdrive clutch engages and
turns the overdrive hub, which is splined to the front
planetary carrier. When line pressure to the clutch
is released, the belleville spring on the front side
of the
OD/REV
piston returns the piston to its re-
leased position.
Reverse
clutch
Front sun
gear hub
The reverse clutch is located in the back of the
input clutch assembly. The reverse clutch is oper-
ated by the same piston, pressure plate and belleville
spring that operates the overdrive clutch. Line pres-
sure that applies the reverse clutch comes from
the valve body, directed through passages in the
case, oil pump and reaction shaft support. The line
pressure then goes through the input hub to the
front side of the
ODFIEV
piston. The pressure
moves the piston to the back and compresses the
reverse clutch pack. When the clutch is applied,
it turns the front sun gear and hub assembly.
When line pressure to the reverse clutch is removed,
the belleville spring will pull the piston forward to
its released position. The
OD/REV
clutch piston
belleville spring is positioned so it will counter the
piston to prevent either the overdrive or reverse
clutches from dragging when they are not applied.
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