Jeep Grand Cherokee WK. Manual — part 1476
ulating pressure (p-MOD), and the shift pressure in clutch B1 (7). The increasing shift pressure in clutch B1, which
also acts on the end face of the overlap valve, reduces the overlap pressure.
Shift Phase - 2-1 Shift Phase 2
The pressure in clutch B1 (7) acting on the end face of the 1-2/4-5 holding valve (4) forces the valve to up-shift
against the spring pressure and allows line pressure (p-A) to pass through the command valve (5).
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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2-1 Shift - First Gear Engaged
After the gear change is complete, the 1-2/4-5 shift solenoid (1) is turned off. This reduces the pressure on the end
face of the 1-2/4-5 command valve (5) to 0 psi and the spring pressure downshifts the valve to its initial position.
The line pressure (p-A) is switched to the holding clutch B1 (7) and the end face of the holding valve by the down-
shifted command valve. The upshifted holding valve also allows the remaining pressure in clutch K1 (6) to be
vented.
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
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Gear Shift N to D (1st gear) - Engine Started
With the engine started and the gearshift lever in the NEUTRAL or PARK positions, holding clutch B1 (1) and driving
clutch K3 (4) are applied and the various valves in the 1-2/4-5 shift group are positioned to apply pressure to the
holding clutch B2.
1 - HOLDING CLUTCH B1
11 - PRESSURE HOLDING VALVE
2 - DRIVING CLUTCH K1
12 - 3-4 HOLDING PRESSURE SHIFT VALVE
3 - HOLDING CLUTCH B3
13 - 3-4 COMMAND VALVE
4 - DRIVING CLUTCH K3
14 - 3-4 SHIFT PRESSURE SHIFT VALVE
5 - HOLDING CLUTCH B2 PISTON
15 - 3-4 OVERLAP REGULATING VALVE
6 - HOLDING CLUTCH B2 PISTON OPPOSING FACE
16 - BALL VALVE
7 - SHIFT PRESSURE REGULATING SOLENOID
17 - 1-2/4-5 COMMAND VALVE
8 - SHIFT PRESSURE REGULATING VALVE
18 - 1-2/4-5 COMMAND VALVE
9 - SHIFT VALVE B2
19 - BALL VALVE
10 - 3-4 SHIFT SOLENOID
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Activation Sequence
The selector valve opens the shift pressure (p-S) feed connection from the ball valve (19) with the shift valve B2 (9).
With the shift valve B2 (9) in the upper position, shift pressure (p-S) travels behind the piston B2 (5) and simulta-
neously to the opposing face of the piston B2 (6). The multiple-disc holding clutch B2 begins to close.
The pressure on the opposing face of the piston B2 (6) ensures a soft activation of the multiple-disc holding clutch
B2.
1 - HOLDING CLUTCH B1
11 - PRESSURE HOLDING VALVE
2 - DRIVING CLUTCH K1
12 - 3-4 HOLDING PRESSURE SHIFT VALVE
3 - HOLDING CLUTCH B3
13 - 3-4 COMMAND VALVE
4 - DRIVING CLUTCH K3
14 - 3-4 SHIFT PRESSURE SHIFT VALVE
5 - HOLDING CLUTCH B2 PISTON
15 - 3-4 OVERLAP REGULATING VALVE
6 - HOLDING CLUTCH B2 PISTON OPPOSING FACE
16 - BALL VALVE
7 - SHIFT PRESSURE REGULATING SOLENOID
17 - 1-2/4-5 COMMAND VALVE
8 - SHIFT PRESSURE REGULATING VALVE
18 - 1-2/4-5 COMMAND VALVE
9 - SHIFT VALVE B2
19 - BALL VALVE
10 - 3-4 SHIFT SOLENOID
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AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
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