Jeep Grand Cherokee WK. Manual — part 1474
Center Planetary Gear Set
The annulus gear (10) is held against the housing by the multiple-disc holding clutch B3 (5) via the mechanical
connection to the planetary carrier (15). The sun gear (22) turns backwards due to the engaged multiple-disc clutch
K3 (12). The planetary gears (18) turn on the fixed annulus gear (10) and increase the torque from the sun gear
(22) to the planetary carrier (14). The output shaft (26) connected to the planetary carrier (14) turns at a reduced
speed in the opposite direction to the running direction of the engine.
REVERSE GEAR POWERFLOW - LIMP IN or 4WD LOW RANGE
1 - TORQUE CONVERTER LOCK-UP CLUTCH
14 - CENTER PLANETARY CARRIER
2 - TORQUE CONVERTER TURBINE
15 - REAR PLANETARY CARRIER
3 - TORQUE CONVERTER IMPELLER
16 - TORQUE CONVERTER STATOR
4 - HOLDING CLUTCH B1
17 - FRONT PLANETARY PINION GEARS
5 - HOLDING CLUTCH B3
18 - CENTER PLANETARY PINION GEARS
6 - HOLDING CLUTCH B2
19 - REAR PLANETARY PINION GEARS
7 - DRIVING CLUTCH K1
20 - FREEWHEELING CLUTCH F1
8 - FRONT PLANETARY ANNULUS GEAR
21 - FRONT PLANETARY SUN GEAR
9 - DRIVING CLUTCH K2
22 - CENTER PLANETARY SUN GEAR
10 - CENTER PLANETARY ANNULUS GEAR
23 - REAR PLANETARY SUN GEAR
11 - REAR PLANETARY ANNULUS GEAR
24 - FREEWHEELING CLUTCH F2
12 - DRIVING CLUTCH K3
25 - INPUT SHAFT
13 - FRONT PLANETARY CARRIER
26 - OUTPUT SHAFT
A - ENGINE SPEED
D - SECOND GEAR RATIO
B - TRANSMISSION INPUT SPEED
E - FIXED PARTS
C - FIRST GEAR RATIO
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AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
WK
Torque from the torque converter is increased via the input shaft (25) and all three planetary gearsets and trans-
ferred with reversed direction of rotation to the output shaft (26) and.
Front Planetary Gear Set
The clutch K1 (7) is shifted. The planetary carrier (13) and sun gear (21) are connected to each other as a result.
The annulus gear (8) is driven via the input shaft (25). The planetary gear set is locked and turns as a unit.
Rear Planetary Gear Set
The planetary carrier (15) is held against the housing by the engaged multiple-disc holding clutch B3 (5). The annu-
lus gear (11) turns at a reduced speed due to the mechanical connection to the front planetary carrier (13). The
planetary pinion gears (19) turn between the annulus gear (11) and the sun gear (23). The direction is reversed by
the held planetary carrier (15) so that the sun gear (23) turns in the opposite direction to the running direction of the
engine.
Center Planetary Gear Set
The annulus gear (10) is held against the housing by the multiple-disc holding clutch B3 (5) via the mechanical
connection to the planetary carrier (15). The sun gear (22) turns backwards due to the engaged multiple-disc clutch
K3 (12). The planetary gears (18) turn on the fixed annulus gear (10) and increase the torque from the sun gear
1 - TORQUE CONVERTER LOCK-UP CLUTCH
14 - CENTER PLANETARY CARRIER
2 - TORQUE CONVERTER TURBINE
15 - REAR PLANETARY CARRIER
3 - TORQUE CONVERTER IMPELLER
16 - TORQUE CONVERTER STATOR
4 - HOLDING CLUTCH B1
17 - FRONT PLANETARY PINION GEARS
5 - HOLDING CLUTCH B3
18 - CENTER PLANETARY PINION GEARS
6 - HOLDING CLUTCH B2
19 - REAR PLANETARY PINION GEARS
7 - DRIVING CLUTCH K1
20 - FREEWHEELING CLUTCH F1
8 - FRONT PLANETARY ANNULUS GEAR
21 - FRONT PLANETARY SUN GEAR
9 - DRIVING CLUTCH K2
22 - CENTER PLANETARY SUN GEAR
10 - CENTER PLANETARY ANNULUS GEAR
23 - REAR PLANETARY SUN GEAR
11 - REAR PLANETARY ANNULUS GEAR
24 - FREEWHEELING CLUTCH F2
12 - DRIVING CLUTCH K3
25 - INPUT SHAFT
13 - FRONT PLANETARY CARRIER
26 - OUTPUT SHAFT
A - ENGINE SPEED
D - SECOND GEAR RATIO
B - TRANSMISSION INPUT SPEED
E - FIXED PARTS
C - FIRST GEAR RATIO
WK
AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
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(22) to the planetary carrier (14). The output shaft (26) connected to the planetary carrier (14) turns at a reduced
speed in the opposite direction to the running direction of the engine.
SHIFT GROUPS/ SHIFT SEQUENCE
1-2 Shift - First Gear Engaged
1 - 1-2/4-5 SHIFT SOLENOID
5 - 1-2/4-5 COMMAND VALVE
2 - 1-2/4-5 OVERLAP VALVE
6 - DRIVING CLUTCH K1
3 - 1-2/4-5 SHIFT PRESSURE SHIFT VALVE
7 - HOLDING CLUTCH B1
4 - 1-2/4-5 HOLDING PRESSURE SHIFT VALVE
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AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
WK
The end face of the command valve (5) is kept unpressurized via the solenoid valve for 1-2 and 4-5 shift (1).
Because of the holding pressure shift valve (4), the working pressure (p-A) is present at the multiple-disc holding
clutch B1 (7). Clutch K1 (6) is unpressurized.
Shift Phase - 1-2 Shift Phase 1
1 - 1-2/4-5 SHIFT SOLENOID
5 - 1-2/4-5 COMMAND VALVE
2 - 1-2/4-5 OVERLAP VALVE
6 - DRIVING CLUTCH K1
3 - 1-2/4-5 SHIFT PRESSURE SHIFT VALVE
7 - HOLDING CLUTCH B1
4 - 1-2/4-5 HOLDING PRESSURE SHIFT VALVE
WK
AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
21 - 709
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