to apply the converter clutch piston, both the con-
verter clutch control valve and the converter control
valve move, allowing pressure to be applied to the
back side of the clutch.
T/C REGULATOR VALVE
The torque converter regulator valve slightly regu-
lates the flow of fluid to the torque converter.
LOW/REVERSE SWITCH VALVE
The low/reverse clutch is applied from different
sources, depending on whether low (1st) gear or
reverse is selected. The low/reverse switch valve
alternates positions depending on from which direc-
tion fluid pressure is applied. By design, when the
valve is shifted by fluid pressure from one channel,
the opposing channel is blocked. The switch valve
alienates the possibility of a sticking ball check, thus
providing consistent application of the low/reverse
clutch under all operating conditions.
VENT RESERVOIR CHECK VALVE
The vent reservoir check valve is designed for
quick venting during garage shifts to prevent the
overdrive and reverse clutches from dragging. Inad-
vertent motion of the reverse/overdrive (push/pull)
piston can be caused by the unbalanced centrifugal
forces in the reverse and overdrive chambers. By
linking the overdrive and reverse vents to the vent
reservoir at the manual valve, an equal residual
pressure will be maintained, thus balancing the cen-
trifugal forces in the reverse and the overdrive cham-
bers.
ACCUMULATORS
DESCRIPTION
The 42LE underdrive, overdrive, low/reverse, and
2/4 clutch hydraulic circuits each contain an accumu-
lator. An accumulator assembly typically consists of a
piston, seals, return spring(s), and a cover or plug
(Fig. 7).
The overdrive and underdrive accumulators are
located within the transaxle case, and are retained
by the valve body (Fig. 8).
The low reverse accumulator (Fig. 8) is also located
within the transaxle case, but the assembly is
retained by a cover and a snap-ring.
Fig. 6 Valve Body—Exploded
1 – VALVE BODY
2 – T/C REGULATOR VALVE
3 – L/R SWITCH VALVE
4 – VENT RESERVOIR CHECK VALVE
5 – CONVERTER CLUTCH CONTROL VALVE
6 – MANUAL VALVE
7 – CONVERTER CLUTCH SWITCH VALVE
8 – SOLENOID SWITCH VALVE
9 – REGULATOR VALVE
LH 42LE TRANSAXLE 21 - 7
DESCRIPTION AND OPERATION (Continued)
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