Jeep Grand Cherokee WK. Manual — part 1399
ASSEMBLY
1. Check the bleed orifice to ensure that it is not
plugged or restricted.
2. Install a new seal on the low/reverse piston. Lubri-
cate the seal with Mopar
T
ATF +4, Automatic
Transmission Fluid, prior to installation.
3. Install the low/reverse piston into the low/reverse
clutch retainer.
4. Position the low/reverse piston Belleville spring (3)
on the low/reverse piston.
5. Using Spring Compressor 8285 (2) and a suitable
shop press (1), compress the low/reverse piston
Belleville spring (3) and install the split retaining
ring to hold the Belleville spring into the low/re-
verse clutch retainer.
6. Install the lower overrunning clutch snap-ring.
7. Assemble the inner and outer races (2) of the over-
running clutch (3).
8. Position the overrunning clutch spacer (4) on the
overrunning clutch (3).
9. Install the upper overrunning clutch snap-ring (1).
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10. Assemble and install the low/reverse clutch pack (3, 4) into the low/reverse clutch retainer (5).
11. Install the low/reverse reaction plate (2) into the low/reverse clutch retainer (5). The reaction plate is directional
and must be installed with the flat side down.
12. Install the low/reverse clutch pack snap-ring (1). The snap-ring is selectable and should be chosen to give the
correct clutch pack clearance.
13. Measure the low/reverse clutch pack clearance and adjust as necessary. The correct clutch clearance is 1.00-
1.74 mm (0.039-0.075 in.).
14. Install the overrunning clutch (12) into the low/reverse clutch retainer (5) making sure that the index splines are
aligned with the retainer.
15. Install the overrunning clutch inner snap-ring (13).
Low/Reverse Clutch Assembly
1 - SNAP-RING (SELECT)
8 - SEAL
2 - REACTION PLATE
9 - BELLEVILLE SPRING
3 - DISC
10 - RETAINER
4 - PLATE
11 - SNAP-RING
5 - L/R CLUTCH RETAINER
12 - OVERRUNNING CLUTCH
6 - SEAL
13 - SNAP-RING
7 - PISTON
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PUMP-OIL
DESCRIPTION
The oil pump (2) is located at the front of the trans-
mission inside the bell housing and behind the trans-
mission front cover.
The oil pump consists of two independent pumps.
The oil pump also contains a number of valves. The
converter clutch switch (3) and control valves (2),
pressure regulator valve (5), and converter pressure
limit valve (6) are all located in the oil pump valve
body.
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A front seal (2), and a bolt on reaction shaft (5) complete the oil pump assembly.
OPERATION
As the torque converter rotates, the converter hub rotates the oil pump drive gear. As the drive gear rotates both
driven gears, a vacuum is created when the gear teeth come out of mesh. This suction draws fluid through the
pump inlet from the oil pan. As the gear teeth come back into mesh, pressurized fluid is forced into the pump outlet
and to the oil pump valves.
At low speeds, both sides of the pump supply fluid to the transmission. As the speed of the torque converter
increases, the flow from both sides increases until the flow from the primary side alone is sufficient to meet system
demands. At this point, the check valve located between the two pumps closes. The secondary side is shut down
and the primary side supplies all the fluid to the transmission.
Oil Pump Reaction Shaft
1 - PUMP HOUSING
4 - SEAL RING (5)
2 - SEAL
5 - REACTION SHAFT SUPPORT
3 - OIL FILTER SEAL
6 - PUMP VALVE BODY
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