First Gear Powerflow - Jeep 200 Cherokee Service Manual

21 - 94 AUTOMATIC TRANSMISSION—30RH
DESCRIPTION AND OPERATION (Continued)

FIRST GEAR POWERFLOW

When the gearshift lever is moved into the drive
position the transmission goes into first gear (Fig. 6).
As soon as the transmission is shifted from park or
neutral to drive, the rear clutch applies, applying the
rear clutch pack to the front annulus gear. Engine
torque is now applied to the front annulus gear turn-
ing it in a clockwise direction. With the front annulus
gear turning in a clockwise direction, it causes the
front planets to turn in a clockwise direction. The
rotation of the front planets cause the sun to revolve
in a counterclockwise direction. The sun gear now
transfers its counterclockwise rotation to the rear
planets which rotate back in a clockwise direction.
With the rear annulus gear stationary, the rear
planet rotation on the annulus gear causes the rear
planet carrier to revolve in a counterclockwise direc-
tion. The rear planet carrier is splined into the low–
reverse drum, and the low reverse drum is splined to
the inner race of the over–running clutch. With the
over–running clutch locked, the planet carrier is
held, and the resulting torque provided by the planet
pinions is transferred to the rear annulus gear. The
rear annulus gear is splined to the output shaft and
rotated along with it (clockwise) in an underdrive
gear reduction mode.
1 – OUTPUT SHAFT
2 – OVER-RUNNING CLUTCH HOLDING
3 – REAR CLUTCH APPLIED
4 – OUTPUT SHAFT
Fig. 6 First Gear Powerflow
5 – OVER-RUNNING CLUTCH HOLDING
6 – INPUT SHAFT
7 – REAR CLUTCH APPLIED
8 – INPUT SHAFT
XJ