Jeep Cherokee 1999 Electronic Service Manual page 1411

21 - 88 TRANSMISSION AND TRANSFER CASE
DI AGN OSI S AN D T EST I N G (Cont inue d)
CONDITION
BUZZING NOISE
SLIPS IN REVERSE ONLY
SLIPS IN FORWARD
DRIVE RANGES
SLIPS IN LOW GEAR D
ONLY, BUT NOT IN 1
POSITION
POSSIBLE CAUSES
1. Fluid Level Low.
2. Shift Cable Misassembled.
3. Valve Body Misassembled.
4. Pump Passages Leaking.
5. Cooling System Cooler Plugged.
6.Overrunning Clutch Damaged.
1. Fluid Level Low.
2. Gearshift Linkage Misadjusted.
3. Rear Band Misadjusted.
4. Rear Band Worn.
5. Hydraulic Pressure Too Low.
6. Rear Servo Leaking.
7. Band Linkage Binding.
1. Fluid Level Low.
2. Fluid Foaming.
3. Throttle Linkage Misadjusted.
4. Gearshift Linkage Misadjusted.
5. Rear Clutch Worn.
6. Low Hydraulic Pressure Due to
Worn Pump, Incorrect Control
Pressure Adjustments, Valve Body
Warpage or Malfunction, Sticking
Governor, Leaking Seal Rings,
Clutch Seals Leaking, Servo Leaks,
Clogged Filter or Cooler Lines.
7. Rear Clutch Malfunction, Leaking
Seals or Worn Plates.
8. Overrunning Clutch Worn, Not
Holding (Slips in 1 Only).
Overrunning Clutch Faulty.
CORRECTION
1. Add fluid and check for leaks.
2. Route cable away from engine and bell
housing.
3. Remove, disassemble, inspect valve
body. Reassemble correctly if necessary.
Replace assembly if valves or springs are
damaged. Check for loose bolts or screws.
4. Check pump for porous casting, scores
on mating surfaces and excess rotor
clearance. Repair as required. Loose pump
bolts.
5. Flow check cooler circuit. Repair as
needed.
6. Replace clutch.
1. Add fluid and check for leaks.
2. Adjust linkage.
3. Adjust band.
4. Replace as required.
5. Perform hydraulic pressure tests to
determine cause.
6. Air pressure check clutch-servo operation
and repair as required.
7. Inspect and repair as required.
1. Add fluid and check for leaks.
2. Check for high oil level, bad pump
gasket or seals, dirt between pump halves
and loose pump bolts. Replace pump if
necessary.
3. Adjust linkage.
4. Adjust linkage.
5. Inspect and replace as needed.
6. Perform hydraulic and air pressure tests
to determine cause.
7. Air pressure check clutch-servo operation
and repair as required.
8. Replace Clutch.
Replace overrunning clutch.
X J