Jeep Grand Cherokee WK. Manual — part 1500
REMOVAL
1. Move selector lever to position
9
P
9
.
2. Raise vehicle.
3. Remove bolt (3) and screw (1) holding the heat
shield (2) to the transmission.
4. Disconnect 13-pin plug connector (1). Turn bayonet
lock of guide bushing (2) anti-clockwise.
5. Loosen guide bushing (2) and remove from trans-
mission housing.
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AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
WK
6. Detach oil pan (5).
7. Remove oil filter (4).
8. Unscrew Torx socket bolts (3) and remove electro-
hydraulic control module (2).
DISASSEMBLY
1. Remove electrohydraulic unit from the vehicle.
(Refer
to
21
-
TRANSMISSION/AUTOMATIC
TRANSMISSION - NAG1/ELECTROHYDRAULIC
UNIT - REMOVAL)
2. Remove solenoid caps (1, 2).
3. Unscrew Torx
T
socket bolts (3, 4).
NOTE: Pay attention to the different lengths of the
Torx
T
socket bolts.
4. Remove leaf springs (5).
5. Withdraw solenoid valves (6 - 11) from shift plate
(13).
NOTE: Check O-rings on solenoid valves for dam-
age and replace if necessary.
6. Bend away retaining lug on stiffening rib on trans-
mission oil temperature sensor.
1 - SOLENOID CAP
2 - SOLENOID CAP
3 - BOLT - M6X32
4 - BOLT - M6X30
5 - LEAF SPRING
6 - MODULATING PRESSURE REGULATING SOLENOID VALVE
7 - SHIFT PRESSURE REGULATING SOLENOID
8 - 3-4 SHIFT SOLENOID
9 - TORQUE CONVERTER LOCK-UP SOLENOID
10 - 1-2/4-5 SHIFT SOLENOID
11 - 2-3 SHIFT SOLENOID
12 - ELECTRICHYDRAULIC CONTROL MODULE
13 - SHIFT PLATE
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AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
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7. Remove electrohydraulic control module (12) from the shift plate (13).
8. Note the locations of the major shift valve group
components for assembly reference.
A - Operating and Lubricating Pressure Regulating
valves and 2-3 Overlap valve
B - 1-2/4-5 Shift Group and Shift, Shift Valve, and
Regulating Valve Pressure Regulating Valves
C - 3-4 Shift Group
D - 2-3 Shift Group, TCC Lock-up, and B2 Regulat-
ing Valves
NOTE: Pay great attention to cleanliness for all
work on the shift plate. Fluffy cloths must not be
used. Leather cloths are particularly good. After
dismantling, all parts must be washed and blown
out with compressed-air, noting that parts may be
blown away.
9. Unbolt leaf spring (5).
10. Unscrew Torx
T
bolts (1).
11. Remove valve housing (2) from valve body (4).
12. Remove sealing plate (3).
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AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
WK
13. Remove the strainers (1, 2) for the modulating
pressure
and
shift
pressure
control
solenoid
valves from the valve housing.
14. Remove the strainer (1) in the inlet to torque con-
verter lock-up control solenoid valve.
NOTE: A total of 12 valve balls are located in the
valve body, four made from plastic (4) and eight
from steel (1, 3).
15. Note the location of all check balls (1, 3, 4) and
the central strainer (2) for re-installation. Remove
all check balls (1, 3, 4) and the central strainer
(2).
WK
AUTOMATIC TRANSMISSION - NAG1 - SERVICE INFORMATION
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