Accumulator - Jeep cherokee 2000 Service Manual

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DESCRIPTION AND OPERATION (Continued)
MANUAL VALVE
The manual valve (Fig. 35) is a relay valve. The
purpose of the manual valve is to direct fluid to the
correct circuit needed for a specific gear or driving
range. The manual valve, as the name implies, is
manually operated by the driver with a lever located
on the side of the valve body. The valve is connected
mechanically by either a cable or linkage to the gear-
shift mechanism. The valve is held in each of its
positions by a spring–loaded roller or ball that
engages the "roostercomb" of the manual valve.

ACCUMULATOR

DESCRIPTION
The accumulator (Fig. 36) is a hydraulic device
that has the sole purpose of cushioning the applica-
tion of a band or clutch. The accumulator consists of
a dual–land piston and a spring located in a bore in
the transmission case.
OPERATION
Line pressure is directed between the lands of the
piston (Fig. 37), bottoming it against the accumulator
plate. The accumulator stays in this position after
the transmission is placed into a Drive position.
When the 1–2 upshift occurs (Fig. 38), line pressure
1 – 1-2 GOVERNOR PLUG
2 – 2-3 GOVERNOR PLUG
3 – GOVERNOR REAR CLUTCH ACCUMULATOR
4 – THROTTLE VALVE
AUTOMATIC TRANSMISSION—30RH
1 – ACCUMULATOR PISTON
2 – PISTON SPRING
is directed to the large end of the piston and then to
the kickdown servo. As the line pressure reaches the
accumulator, the combination of spring pressure and
line pressure forces the piston away from the accu-
mulator plate. This causes a balanced pressure situ-
ation, which results in a cushioned band application.
After the kickdown servo has become immovable, line
pressure will finish pushing the accumulator up into
its bore. When the large end of the accumulator pis-
ton is seated in its bore, the band or clutch is fully
applied.
Fig. 35 Manual Valve
5 – LAND #1
6 – PUMP
7 – PRESSURE REGULATOR
8 – LAND #2
Fig. 36 Accumulator
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