Jeep Grand Cherokee WK. Manual — part 1400
CONVERTER CLUTCH SWITCH VALVE
The converter clutch switch valve is used to control the hydraulic pressure supplied to the front (OFF) side of the
torque converter clutch.
CONVERTER CLUTCH REGULATOR VALVE
The converter clutch regulator valve is used to control the hydraulic pressure supplied to the back (ON) side of the
torque converter clutch.
TORQUE CONVERTER LIMIT VALVE
The torque converter limit valve serves to limit the available line pressure to the torque converter clutch.
STANDARD PROCEDURE - OIL PUMP VOLUME CHECK
Measuring the oil pump output volume will determine if sufficient oil flow to the transmission oil cooler exists, and
whether or not an internal transmission failure is present.
Verify that the transmission fluid is at the proper level. Refer to the Fluid Level Check procedure in this section. If
necessary, fill the transmission to the proper level with Mopar
T
ATF +4, Automatic Transmission Fluid.
1. Disconnect the To cooler line at the cooler inlet and place a collecting container under the disconnected line.
CAUTION: With the fluid set at the proper level, fluid collection should not exceed (1) quart or internal dam-
age to the transmission may occur.
2. Run the engine at 1800 rpm, with the shift selector in neutral. Verify that the transmission fluid temperature is
below 104.5° C (220° F) for this test.
3. If one quart of transmission fluid is collected in the container in 30 seconds or less, oil pump flow volume is
within acceptable limits. If fluid flow is intermittent, or it takes more than 30 seconds to collect one quart of fluid,
refer to the Hydraulic Pressure tests in this section for further diagnosis.
4. Re-connect the To cooler line to the transmission cooler inlet.
5. Refill the transmission to proper level.
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DISASSEMBLY
1. Remove the bolts holding the reaction shaft support (5) to the oil pump.
2. Remove the reaction shaft support (5) from the oil pump.
3. Remove all bolts holding the oil pump halves together.
4. Using suitable prying tools, separate the oil pump sections by inserting the tools in the supplied areas and prying
the halves apart.
NOTE: The oil pump halves are aligned to each other through the use of two dowels. Be sure to pry upward
evenly to prevent damage to the oil pump components.
Oil Pump Assembly
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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5. Remove the screws (7) holding the separator plate (1) onto the oil pump housing (4).
6. Remove the separator plate (1) from the oil pump housing (4).
7. Mark all gears for location. The gears are select fit and if the oil pump is to be reused, the gears must be
returned to their original locations.
8. Remove the oil pump gears (2, 6) from the oil pump housing (4).
Oil Pump Housing and Gears
1 - SEPARATOR PLATE
5 - DOWEL (2)
2 - DRIVEN GEAR (2)
6 - DRIVE GEAR
3 - CHECK VALVE
7 - SCREW
4 - PUMP HOUSING
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9. Remove the oil pump valve retainers (1) and asso-
ciated valve (2) and spring one at a time. Mark the
combination of components as a group and tag
them as to the location from which they were
removed.
10. Remove the T/C regulator valve (1), T/C limit
valve (2), and regulator valve (3).
CLEANING
Clean pump and support components with solvent and dry them with compressed air.
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