Jeep Cherokee 2000 Service Manual - page 1010
OPERATION
As the torque converter rotates, the converter hub
rotates the inner and outer gears. As the gears
rotate,
the
clearance
between
the
gear
teeth
increases in the crescent area, and creates a suction
at the inlet side of the pump. This suction draws
fluid through the pump inlet from the oil pan. As the
clearance between the gear teeth in the crescent area
decreases, it forces pressurized fluid into the pump
outlet and to the valve body.
VALVE BODY
DESCRIPTION
The valve body consists of a cast aluminum valve
body, a separator plate, and transfer plate. The valve
body contains valves and check balls that control
fluid delivery to the torque converter clutch, bands,
and frictional clutches. The valve body contains the
following components (Fig. 18) and (Fig. 19):
• Regulator valve
• Regulator valve throttle pressure plug
• Line pressure plug and sleeve
• Kickdown valve
• Kickdown limit valve
• 1–2 shift valve
• 1–2 control valve
• 2–3 shift valve
• 2–3 governor plug
• Throttle valve
• Throttle pressure plug
• Switch valve
• Manual valve
• Converter clutch control valve
• Fail-safe valve
• Shuttle valve
• Shuttle valve throttle plug
• 9 check balls
By adjusting the spring pressure acting on the reg-
ulator valve, transmission line pressure can be
adjusted.
OPERATION
NOTE: Refer to the Hydraulic Schematics for a
visual aid in determining valve location, operation
and design.
Fig. 17 Oil Pump Assembly
1 – OIL SEAL
2 – OIL PUMP BODY
3 – VENT
4 – REACTION SHAFT SUPPORT
5 – INNER ROTOR
6 – OUTER ROTOR
7 – “O” RING
21 - 102
AUTOMATIC TRANSMISSION—30RH
XJ
DESCRIPTION AND OPERATION (Continued)