Jeep Cherokee 2000 Service Manual - page 1522
TORQUE CONVERTER
DESCRIPTION
The torque converter (Fig. 5) is a hydraulic device
that couples the engine crankshaft to the transmis-
sion. The torque converter consists of an outer shell
with an internal turbine, a stator, an overrunning
clutch, an impeller and an electronically applied con-
verter clutch. The converter clutch provides reduced
engine
speed
and
greater
fuel
economy
when
engaged. Clutch engagement also provides reduced
transmission fluid temperatures. Torque converter
clutch engagement occurs in second gear in 1–2 posi-
tion; third gear in 3 position and third and fourth
gear in D position. The torque converter hub drives
the transmission oil (fluid) pump.
The torque converter is a sealed, welded unit that
is not repairable and is serviced as an assembly.
CAUTION: The torque converter must be replaced if
a transmission failure resulted in large amounts of
metal or fiber contamination in the fluid. If the fluid
is contaminated, flush the fluid cooler and lines.
Fig. 5 Torque Converter Assembly
1 – TURBINE
2 – IMPELLER
3 – HUB
4 – STATOR
5 – CONVERTER CLUTCH DISC
6 – DRIVE PLATE
21 - 222
AW–4 AUTOMATIC TRANSMISSION
XJ
DESCRIPTION AND OPERATION (Continued)