Jeep cherokee 2000 Service Manual page 1017

XJ
DESCRIPTION AND OPERATION (Continued)
1 – TO FRONT SERVO AND 2-3 SHIFT VALVE
2 – THROTTLE PRESSURE
1–2 SHIFT VALVE
The 1–2 shift valve assembly (Fig. 27), or mecha-
nism, consists of: the 1–2 shift valve, governor plug,
and a spring on the end of the valve. After the man-
ual valve has been placed into a forward gear range,
line pressure is directed to the 1–2 shift valve. As the
throttle is depressed, throttle pressure is applied to
the right side of the 1–2 shift valve assembly. With
throttle pressure applied to the right side of the
valve, there is now both spring pressure and throttle
pressure acting on the valve, holding it against the
governor plug. As the vehicle begins to move and
build speed, governor pressure is created and is
applied to the left of the valve at the governor plug.
Fig. 27 1–2 Shift Valve-Before Shift
3 – LINE PRESSURE
4 – LINE PRESSURE PASSAGE FOR MANUAL LOW POSITION
AUTOMATIC TRANSMISSION—30RH 21 - 109