Hydraulic Control System; Manual First Gear 1 Position; Manual Second Gear 2 Position; Reverse - Jeep J-10 Series 1982 Technical & Service Manual

2C-8 AUTOMATIC TRANSMISSION
Because torque is still transmitted through the rear
clutch retainer, front annulus gear and front planetary
gear carrier, the front planetary gears transmit torque
to the output shaft through the front planetary carrier
which is splined to the shaft. The rear planetary gears
are locked to the sun gear and the rear annulus gear and
low/reverse drum rotate with the output shaft but do
not transmit torque.
The front and rear planetary gears are not rotating in
Drive-third gear. The only rotation present is the input
from the engine and the output shaft. All other con
nected parts rotate as one common unit.
Manual First Gear 1 Position
Torque flow in manual first gear is the same as in
Drive-first gear except an additional element is em
ployed. Along with the rear clutch, the rear band is also
applied to provide engine braking action. The transmis
sion will not upshift in manual first gear 1 position.
Torque flow is from the input shaft to the rear clutch
retainer and front annulus gear (fig. 2C-12). The an
nulus gear revolves at engine speed and direction of
rotation causing the front planetary gears to also rotate
at engine speed and direction.
INPUT
SHAFT
REAR BAND
APPLIED
REAR CLUTCH
ENGAGED
OVERRUNNING
CLUTCH ENGAGED
80752
Fig. 2C-12 Torque Flow In Manual First Gear 1 Position
The front planetary carrier, which is splined to the
output shaft, is held stationary momentarily. This con-
stition causes the front planetary gears to turn the sun
gear and driving shell opposite engine rotation. Sun gear
rotation then causes the rear planetary gears to rotate in
engine direction. Since the rear planetary carrier is
locked to the low/reverse drum, the rear band and over
running clutch prevent the drum and carrier from rotat
ing opposite engine direction. Rear planetary gear action
causes the rear annulus gear to rotate in engine direc
tion. Torque is transferred directly to the output shaft
by the annulus gear which is splined to the shaft.
Manual Second Gear 2 Position
Torque flow and transmission elements employed in
manual second gear are the same as described for drive-
second gear. However, in this position, a 2-3 upshift does
not occur. The transmission will perform a 1-2 upshift
only. Refer to Drive-Second Gear and figure 2C-12 for a
description of torque flow.
Reverse
In Reverse, the front clutch and rear band are applied.
Engine torque input flows from the front clutch retainer
to the driving shell which is locked to the retainer at all
times (fig. 2C-13). Since the driving shell is also splined
to the sun gear, it consequently turns the sun gear in
engine rotation direction. Sun gear rotation then causes
the planet pinions to rotate opposite engine direction.
The rear planetary gear carrier is held stationary by
the rear band, as a result, torque is transmitted directly
to the output shaft through the rear annulus gear which
is splined to the shaft (fig. 2C-13).
In reverse, the front planetary gears are in an idling
condition and all torque flows through the rear plan
etary gears.
HYDRAULIC CONTROL SYSTEM
The hydraulic control system provides fully automatic
operation of the transmission. The system performs five
basic functions, which are:
• Pressure Supply
• Pressure Regulation
• Flow Control
• Clutch and Band Application
• Lubrication
INPUT
SHAFT
OUTPUT
SHAFT
-€1.00
J**
REAR BAND APPLIED
80756
Fig. 2C-13 Torque Row In Reverse