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Automatic Transmission
HYDRAULIC
CONTROL SYSTEM
FUNCTIONS
OF
HYDRAULIC CONTROL
UNIT AND VALVES
OIL
PUMP
MANUAL
LINKAGE
VACUUM
DIAPHRAGM
DOWNSHIFT SOLENOID
GOVERNOR
VALVE
CONTROL
VALVE
ASSEMBLY
HYDRAULIC SYSTEM
AND
MECHANICAL OPERATION
FUNCTIONS
OF
HYDRAULIC
CONTROL
UNIT AND VALVES
The
hydraulic
control system
con
CONTENTS
P
RANGE
PAR K
R
RANGE
REVERSE
N
RANGE
NEUTRAL
D1
RANGE
LOW GEAR
D2
RANGE
2ND
GEAR
D3
RANGE TOP
GEAR
D
RANGE
KICK
DOWN
2
RANGE 2ND GEAR
t
RANGE
LOW GEAR
12
RANGE
2ND
GEAR
AT
4
AT
4
AT
4
AT
5
AT
5
AT
5
AT
6
AT13
tains
an
oil pump for
packing
p
oil
from
the oil
pan
through
the
oil
strainer
A
shift control
is
provided
by
two
centrifugally
operated hydraulic
governors
on
the output shaft
vacuum
control
diaphragm
and
downshift
AT14
AT16
AT18
AT
20
AT
22
AT 24
AT
26
AT
28
AT
30
AT
32
solenoid These parts work
in
conjunc
tion
with
valves in
the valve
body
assembly
located
in
the base of the
transmission
The
valves
regulate
oil
pressure and direct
it
to
appropriate
transmission components
Oil pump
I
I
Control valve
I
Torque
converter
1
I
I
I
Manual
linkage
Front clutch
Vacuum
diaphragm
I
Rear clutch
I
Low
and
reverse
brake
Downshift solenoid
I
Band brake
Governor valve
r
I
Lubrication
OIL
PUMP
The
oil
pump
is
the
source
of
control
medium
i
e
oil
for
the
control system
The oil
pump
is
of
an
internal
involute gear
type
The drive sleeve is
a
part
of the
torque
converter
pump
impeller
and
serves
to
drive the pump
inner
gear with the drive sleeve direct
ly
coupled
with the
engine operation
The oil flows
through
the
following
route
Oil
pan
Oil strainer
bottom of the
control valve
Control valve lower
body
suction
port
Transmission
case
suction
port
Pump housing
suction
port
Pump
gear
space
Pump
housing
delivery
port
Transmission
case
delivery
port
Lower
body
delivery
port
Control valve line
pressure circuit
AT071
I
Housin
4
Inner
gear
2
Cover
5
Crescent
3
Ouler
gear
Fig
AT 3 Oil pump
AT
4
MANUAL LINKAGE
The hand lever motion
the hand
lever
is
localed
in
the driver
s
compart
ment
mechanically
transmitted from
lhe
remote
control
linkage
is
further
transmitted
to
the
inner
manual lever
in
the
transmission
case
from the range
selector lever
in the
right
center
par
tion
of the
transmission
case
through
the manual shaft
The
inner
manual
lever
is
thereby
turned
A
pin
installed
on
the bottom of
the
inner
manual lever slides rhe
manu
al valve
spool
of the conlrol valve thus
positioning
the
spool
opposite
rhe
appropriate
select
posilion
The
parking
rod
pin
is
held
in rhe
groove
on
the top of
Ihe inner
manual
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