Subaru SVX 1992 Manual page 420

AUTOMATIC TRANSMISSION AND DIFFERENTIAL [Mlscol 3- 2
Name Function
Memorizes the 4th speed position, and prevents gear shifting from 4th to 3rd to 2nd
4-2 relay valve speeds due to combined operation of the 4-2 sequence valve, shift valve A and shift valve
B when shifting down from 4th to 2nd speeds .
Inhibits release of band servo operating pressure acting at 4th speed until the high clutch
4-2 sequence valve operating pressure and band servo release pressure (same hydraulic circuit) are drained
when shifting down from 4th speed to 2nd speed .
The 2nd speed band servo actuating hydraulic circuit has an accumulator and one-way
orifice for relieving shift shock when shifting from 1 st speed to 2nd speed . The servo
Servo charger valve charger valve is installed to ensure sufficient oil flow when shifting down from 4th to 2nd
speed, or from 3rd to 2nd speed . It operates at 3rd or higher speeds and supplies the 2nd
speed band servo actuating pressure by bypassing the one-way orifice .
When shifting down from "D" range 3rd to "D" range 2nd speed, the timing valve retards
3-2 timing valve the release of band-servo pressure and creates a temporary neutral condition so that vehi-
cle speed can be changed smoothly .
"1st" Reducing valve
Reduces the low & reverse brake operating pressure so as to relieve engine braking shock
" " when changing from range 2nd speed to 1st speed. 2
Reduces the operating pressure applied to the overrunning clutch so as to relieve engine
Overrunning clutch reducing valve braking shock. In the "2" and "3" ranges, line pressure is applied to the valve to raise the
pressure adjusting point, thereby increasing engine braking capacity .
Torque converter regulator valve
Prevents excessive rise of torque converter pressure .
Lock-up control valve
Lock-up control plug
Controls the operation of the lock-up function .
Lock-up control sleeve
Smoothes the transition between the lock-up state and release state .
Changes the oil passage so that output pressure to the duty solenoid B (lock-up) will be
applied to the lock-up valve in the "D" range 2nd, 3rd, or 4th speed .
Shuttle duty shift valve
(Lock-up at 1st speed is inhibited .)
Lock-up control is not actuated if the lock-up solenoid does not generate output pres-
sure when signaled from the control unit, even if the vehicle is in the "D" range 2nd,
3rd, or 4th speeds .
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