Page 461
Operation in 'N'
With the engine running, the primary regulator valve regulates line pressure (1) which is directed to the manual
valve and throttle valve. It also permits fluid to reach the
secondary regulator valve.
The secondary regulator valve regulates pressure to the
converter and lubrication of the front end of the gear
train (21 ). Identical pressure (23) is directed to the rear
end of the gear train. The valve returns excess flow (24)
to the oil pan.
Operation in 'P'
t
An internal linkage from the manual valve detent lever
engages the parking pawl with teeth formed on the driven
shaft ring gear.
With the engine running, the operation of the hydraulic
system is identical to 'N' except that the manual valve
directs line pressure (6) to the rear servo (13).
This arrangement is based upon the design bf the hydraulic system without the rear servo or band performing any
function in this selector position.
Operation in 'R'
Pressure control of the front pump is as in 'P' or 'N' but
in accordance with accelerator pedal depression, throttle
pressure (9) is directed to the spring end of the primary
regulator valve thus increasing line pressure ( 1) in accordance with torque capacity requirements.
The manual valve directs line pressure (6) through the
1-2 shift valve to the rear servo (13) and line pressure
(7) through the 2-3 shift valve to the rear clutch and
front servo release ( 15). Due to absence of governor pressure the shift valves and servo orifice control valve perform no function in this selector position. The fluid passages ( 13) and ( 15) of other manual valve positions are
utilised in 'R' to simplify the hydraulic circuit.
The front clutch applied in conjunction with the one-way
clutch, permits the car to move off from rest, in first gear.
The hydraulic circuit for 2 (1st gear) is the same as for
position 'D' (1st gear) except that the system pressure
(3) is prevented from reaching the 2nd-3rd shift valve
by a flange on the shift valve.
Operation in 'D' or '2' · Second gear
Pressure control by the primary regulator valve will be off
the front pump output. Throttle pressure (8-9) acts upon
the primary regulator valve as in 'D' - 1sl gear.
Shift control is provided by the 1-2 shift valve moving
under influence of governor pressure (2), opposed by
spring force and throttle pressure ( 10). This permits Iine
pressure (5) to reach the apply side of the front servo
(19). The front band thus applied, in conjunction with
the front clutch, provides 2nd gear. With the down shift
valve in the forced throttle position as illustrated, forced
throttle pressure ( 11) acts upon the 1-2 shift valve and
the 2-3 shift valve thus further delaying the upshift (or
providing a 3-2 downshift or a 2-1 downshift at speeds
when there is little governor pressure (2). The hydraulic
circuit for 2 (2nd gear) is the same as position 'D' (2nd
gear) except that the line pressure is prevented from
reaching the 2nd-3rd shift valve from a flange or edge
on the shift valve.
The figure 0-2 shows the downshift valve actutated.
Operation in 'D' - 3rd gear
Pressure control is as in 'D' except that in the throttle
valve position shown (minimum throttle) no throttle
pressure or modulated throttle pressure acts upon the
two ends of the primary regulator valve.
Shift control is provided by the 2-3 shift valve moving
against spring force under influence of governor pressure
(2). This permits line pressure (3) to reach the rear clutch
( 15) and the release side of the front servo through the
servo orifice control valve. When governor pressure (2) is
apparent, the servo orifice control valve closes, forcing
Operation in 'D' or '2' - First gear
Pressure control of the front pump will be as in 'R' but
with the throttle valve in the full throttle position as illustrated, throttle pressure (9) regulated by the modulator
valve plunger (8) acts upon the primary regulator valve
opposing throttle pressure (9), thus modulating line pressure in the interest of shift quality.
The manual valve directs line pressure (5) to the front
clutch, governor feed and 1-2 shift valve for the subsequent 1-2 shift. Line pressure (3) reaches the 2-3 shift
valve for the subsequent 2-3 shift.
SAAB
440-7
Page 462
line pressure through a orifice which thus affects the relationship between rear clutch apply and front servo release
in accordance with road speed. Because the release side of
the front servo has a larger area than the apply side, the
front servo will disenga\:)ethe band. The rear clutch now
engaged in conjunction with the front clutch provides
3rd gear.
The absence of throttle pressure as mentioned above will
cause the 2-3 shift valve to move early under influence
of governor pressure, thus providing a low-speed 2-3
shift.
Operation in T
Pressure control of the front pump will be as in 'D' or '2'.
The manual valve directs line pressure (5) to the front
clutch, governor feed and 1-2 shift valve. In the position
governor pressure (2) to overcome spring pressure. The
result is that the valve prevents line pressure (5) from
reaching the apply side of the front servo but line pressure (6) is open to the rear servo.
440-8
SAMI
Page 463
R
N
M
S 4064
R
p
HYDRAULIC
-
Line pressure
Converter pressure
Return from secondary
regulator valve
CIRCUIT
A. Torque converter
B. Lube
C. Oil pump
D. Front clutch
E. Rear clutch
F. Front band
G. Front servo
IN "N"
/
SA.Ml
NEUTRAL
S 4065
AND "P" PARK
H. Rear band
J. Rear servo
K. Primary regulator valve
L. Secondary regulator valve
M. Strainer
N. 2-3 shift valve
P. 1-2 shift valve
Q. Servo orifice control
valve
R. Governor
S. Manual valve
T. Downshift valve
U. Throttle valve
V. Modulator valve
Y. To oil pan
z; Oil cooler (optional)
440-9
Page 464
A
t
7
0
I
~
0
21
y
5
R
M
-
iiiiiiiii
c:==:::J
R
S 4066
Line pressure
HYDRAULIC
Converter pressure
Return from secondary regulator valve
Throttle
CIRCUIT
A. Torque converter
B. Lube
c. Oil pump
D. Front clutch
E. Rear clutch
F. Front band
G. Front servo
pressure
)
)
IN "R"
REVERSE
H. Rear band
J. Rear servo
K. Primary regulator valve
L. Secondary regulator valve
M. Strainer
N. 2-3 shift valve
P. 1-2 shift valve
Q. Servo orifice control valve
R. Governor
s. Manual valve
T. Downshift valve
u. Throttle valve
V. Modulator valve
Y. To oil pan
z. Oil cooler (optional)
)
Page 465
..
7
21
I
5
R
D-1
M
S 4067
-
Line pressure
HYDRAULIC
-
Converter pressure
A. Torque converter
B. Lube
C. Oil pump
D. Front clutch
E. Rear clutch
F. Front band
G. Front servo
-
Return from secondary regulator valve
Throttle
-
pressure
1::::,:;:;::::
..,:,:-:;:-:) Regulator pressure
(:;:;:;:;:;:::::::::;:::;::1 Modulated
'
....
....
C==:J
throttle
pressure
Shift valve piston pressure
Throttle
pressure controlled
by modulator
valv•~
CIRCUIT
IN "D"
FIRST GEAR
H. Rear band
Rear servo
K. Primary regulator valve
L. Si!condary regulator valve
M. Strainer
N. 2-3 shift valve
P. 1-2 shift valve
J.
Q. Servo orificil
eehtrol valve
A. Governor
S. Manual valve
T. Downshift valve
U. Throttle valve
V. Modulator valve
Y. To oil pan
Z. Oil cooler (optional)
Page 466
~I
....
"'
21
5
7
R
D-2
S 4069
-
Line pressure
-
Converter pressure
-
Return from secondary regulator valve
E=:::J
Throttle
HYDRAULIC
pressure
(':-:;:;::,;:::;:-:,:,:,::j
Regulator pressure,
1:.:,::::
_::::::::::::::)
Modulated throttle
pressure
-
Shift valve Piston pressure
c==J
. Throttle
-
"Kick-<lown"
pressure controlled
pressure
by modulator
CIRCUIT
A. Torque converter
B. Lube
C. Oil pump
D. Front clutch
E. Rear clutch
F. Front band
G. Front servo
valve
IN "D" SECOND GEAR
H. Rear band
J. Rear servo
K. Primary regulator valve
L. Secondary regulator valve
M. Strainer
N. 2-3 shift valve
P. 1-2 shift valve
Q. Servo orifice
control valve
R. Governor
S. Manual valve
T. Downshift valve
U. Throttle valve
V. Modulator valve
Y. To oil pan
Z. Oil cooler (optional)
Page 467
A
-+21
5
2
I
R
D-3
S 4071
HYDRAULIC
-
f:::::::::::::::::::::::::j
t
f...
c.,
Line pressure
Converter pressure
Return from secondary regulator valve
Regulator pressure
CIRCUIT
A. Torque converter
B. Lube
C. Oil pump
D. Front clutch
E. Rear clutch
F. Front band
G. Front servo
IN "D" THIRD
GEAR
H. Rear band
J. Rear servo
K. Primary regulator valve
L. Secondary regulator valve
M. Strainer
N. 2-3 shift valve
P. 1-2 shift valve
Q. Servo orifice
control valve
R. Governor
s. Manual valve
T. Downshift valve
Throttle valve
V. Modulator valve
Y. To oil pan
z. Oil cooler (optional)
u.
Page 468
7
21
y
5
7
R
M
i===i
HYDRAULIC
Line pressure
Converter pressure
B. Lube
C. Oil pump
D. Front clutch
E. Rear clutch
F. Front band
G. Front servo
Return from secondary regulator valve
Throttle
pressure
t::=:::::::::::;:;:\:::j
Regulator pressure
~::::::::,::::::::::::::::j
Modulated throttle
i===i
Throttle
CIRCUIT
A. Torque converter
pressure
pressure controlled
by modulator
IN "1"
FIRST GEAR
a. Servo orifice control valve
H. Rear band
J. Rear servo
K. Primary regulator valve
L. Secondary regulator valve
M. Strainer
N. 2-3 shift valve
P. 1-2 shift valve
R. Governor
S. Manual valve
T. Downshift valve
Throttle valve
V. Modulator valve
Y. To oil pan
z. Oil cooler (optional)
u.
valve
)
)
S 4072
Page 469
A
21
D
y
K
L
5
7
R
M
2-1
S 4068
-
Line pressure
-
Converter pressure
HYDRJlULIC
-
Return from secondary regulator valve
c==:J
Throttle
pressure
1,::::::::::::::::::::::::-\
Regulator pressure
\::::=::::,:,:,:,.,.,,,,:,:!
Modulated throttle
pressure
t
-
Gear shift valve piston pressure
I
....
i===J
Throttle
0
U1
pressure controlled
by modulator
CIRCUIT
A. Torq µe converter
B. LubE'
C. Oil pump
D. Front clutch
E. Rear clutch
F. Front band
G. Front servo
valve
IN "2" FIRST GEAR
H. Rear band
J. Rear servo
K. Primary regulator valve
L. Secondary regulator valve
M. Strainer
N. 2-3 shift valve
P. 1-2 shift valve
Q. Servo orifice control
R. Governor
S. Manual valve
T. Downshift valve
U. Throttle valve
V. Modulator valve
Y. To oil pan
2. Oil cooler (optional)
valve
Page 470
A
8
I
....
7
Cl)
y
K
L
5
I
X
7
R
0
M
-
HYDRAULIC
Line pressure
Return from secondary regulator valve
pressure
J:::::::::::::::::-:-:-:-:-1Regulator
pressure
E2IZJ
Modulated throttle
c:::==J
Throttle
pressure
pressure controlled
by modulator
CIRCUIT
A. Torque converter
B. Lube
C. Oil pump
D. Front clutch
E. Rear clutch
F. Front band
G. Front servo
Converter pressure
Throttle
2-2
~======:6:;T===~===~
IN "2" SECOND GEAR
0. Servo orifice control valve
R. Governor
S. Manual valve
T. Downshift valve
U. Throttle valve
V. Modulator valve
Y. To oil pan
Z. Oil cooler (optional)
H. Rear band
J. Rear servo
K. Primary regulator valve
L. Secondary regulator valve
M. Strainer
N. 2-3 shift valve
P. 1-2 shift valve
valve
)
)
S 4070