Table Of Contents; Stator Valve; Manual Valve - Buick LeSabre 1965 Service Manual

SUPER TURBINE "400'
DESCRIPTION & OPERATION 5 - 9 3
c. 1-2 Accumulator-Low
During Lo Range operation, Lo oil
is directed to the 1-2 accumulator
valve. The Lo port is used for
exhaust when 1-2 accumulator
pressure is regulated, but in Lo
Range 1-2 accumulator becomes
line pressure because the Lo oil
is in this passage. See Figure
5-240.
d. 1-2 Accumulator-Detent
During detent operation, 1-2 ac-
cumulator pressure is increased
by directing detent pressure to an
area on the primary valve which
increases the effective area of
the valve. See Figure 5-241.
5-5 HYDRAULIC
OPERATION
a. Park or Neutral-
Engine Running
Whenever the engine is running at
idle with the selector lever in
"V" or "N", oil from the pump
is directed to the: (See Figure
5-242.)
1. Pressure Regulator Valve
2. Converter
a. Oil Cooler
b. Cooler By-Pass Valve
c. Lubrication System
d. Stator Valve
3. Manual Valve
4. Detent Valve
5. Detent Solenoid
6. Vacuum Modulator Valve
7. Front Servo (Neutral only)
8. Stator Solenoid and Valve
Cooling and Lubrication
Oil flows from the pump to the
pressure regulator valve which
regulates t h e p u m p pressure.
When the pump output exceeds the
LO. DRIVE DEL MOD.
1-2 ACCUMULATOR
Figure 5 - 2 4 1
demand of line pressure, oil from
the pressure regulator is directed
to the converter feed passage to
fill the converter and is directed
to the stator valve. Oil from the
converter, termed converter re-
turn oil, is directed to the trans-
mission cooler and cooler by-pass
valve. Oil from the cooler is
directed to the transmission lub-
rication system.
The cooler by-pass valve permits
oil to be fed directly from the
converter to the lubrication cir-
cuit if t h e c o o l e r b e c o m e s
restricted.
Line Pressure acts on the:
1. Manual Valve
2. Detent Valve
3. Detent Solenoid
4. Modulator Valve
5. Stator Valve
6. Stator Solenoid
Line pressure at the modulator
valve is regulated to a pressure
called modulator oil, which acts
on the pressure boost valve, 1-2
accumulator and primary valves,
and passes through the detent
valve and 3-2 valve to the 1-2
and 2-3 valve trains.
Stator Blade Angle
Line oil at the stator valve and
s t a t o r solenoid i s exhausted
through an orifice at the solenoid,
when the solenoid switch is acti-
vated. (The switch is activated at
idle.) This allows the stator valve
spring to move the stator valve,
cutting off converter oil and al-
lowing stator oil to exhaust. This
places the stator blades at high
angle.
SUMMARY
The converter is filled, stator
blades are at high angle, and all
clutches and bands are released.
The transmission is in Neutral.
b. Drive Range-
First Speed
When the selector lever is moved
to the Drive position, the manual
valve is repositioned to allow line
pressure to enter the drive cir-
cuit. Drive oil then flows to the:
(See Figure 5-243).
1. Forward Clutch
2. 1-2 Shift Valve
3. Governor Assembly
4. 1-2 Accumulator Valve
5. Detent Regulator Valve
Basic Control
Drive oil is directed to the for-
ward clutch where it acts on two
areas of the clutch piston to apply
the forward clutch. The first, or
inner area, is fed through an un-
restricted p a s s a g e . The outer
area is fed through an orifice to
insure a smooth shift from Park,
Neutral and Reverse to Drive.
Drive oil at the governor assem-
bly is regulated to a variable
pressure. This pressure, called
governor oil, increases with vehi-
cle speed and acts against the
ends of the 1-2 and 2-3 shift
valves and an area on the modula-
tor valve.