Jeep cherokee 2000 Service Manual page 1003

XJ
DESCRIPTION AND OPERATION (Continued)
SECOND GEAR POWERFLOW
In drive–second (Fig. 7), the same elements are
applied as in manual–second. Therefore, the power flow
will be the same, and both gears will be discussed as
one in the same. In drive–second, the transmission has
proceeded from first gear to its shift point, and is shift-
ing from first gear to second. The second gear shift is
obtained by keeping the rear clutch applied and apply-
ing the front (kickdown) band. The front band holds the
front clutch retainer that is locked to the sun gear driv-
ing shell. With the rear clutch still applied, the input is
still on the front annulus gear turning it clockwise at
engine speed. Now that the front band is holding the
sun gear stationary, the annulus rotation causes the
front planets to rotate in a clockwise direction. The
front carrier is then also made to rotate in a clockwise
direction but at a reduced speed. This will transmit the
torque to the output shaft, which is directly connected
to the front planet carrier. The rear planetary annulus
gear will also be turning because it is directly splined
to the output shaft. All power flow has occurred in the
front planetary gear set during the drive–second stage
of operation, and now the over–running clutch, in the
rear of the transmission, is disengaged and freewheel-
ing on its hub.
1 – KICKDOWN BAND APPLIED
2 – OUTPUT SHAFT
3 – REAR CLUTCH ENGAGED
4 – OUTPUT SHAFT
5 – OVER-RUNNING CLUTCH FREE-WHEELING
Fig. 7 Second Gear Powerflow
6 – INPUT SHAFT
7 – REAR CLUTCH APPLIED
8 – KICKDOWN BAND APPLIED
9 – INPUT SHAFT
AUTOMATIC TRANSMISSION—30RH 21 - 95