1979 DATSUN 210 lock

Automatic

Transmission

IT
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TI

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t

Ii
i

u6

01

r

Io

I

J
J

li
jJ
lUJ
1
d

AT090t

I

Pressure

regulating
valve

2

Manual
vahe

3

ht
2nd
shift

valve

2nd

3rd
lhift
valve

S
Pressure

modifier
wive
6
Vacuum

throttle
valve

7
Throttle
back
up

valve

8
Solenoid
down

shift
valve

9
Second

lock
valve

10
2
3

timing
valve

Fill
A
T
3
Control

Vol

AT
4

Automatic

Transmission

HYDRAULIC
CONTROL
CIRCUITS

P
RANGE
PARK

Po
r
flow

In

P

range
the
shift

linkage

actuated

parking
pawl
meshes
in
a

gear

splined
to
the

output
shaft

preventing

movement
of
the

car
When
the

engine

is

running
the
low

and
reverse
brake
is

applied
by
pressure
from
the
manual

valve

passing
through
the
1
2
shift

valve
Free
Lock

II

AT086

Fig
AT
7

Parking
M
haniml

FI
1d
flow

Manual
Valve
4
Downshift
Valve
13
2nd

3rd
Shift
Valve

L

1st
2nd
Shift
Valve

Throttle

Back

up
Valve

5
1st
2nd

Shift
Valve
12

I
Throttle
Back

up
Valve

Y
Low
Reverse
Brake

I

AT
6

RANGE
REVERSE

Po

r
flow

With
the
selector

lever
in
R

range
the
front
clutch

is

applied
to

transmit

clockwise

engine
torque

through
the

connecting
shell
to
the

sull
gear
The
clockwise
otation

of
the

sun

gear
causes
the

planet
gears
to

rotate
counterclockwise
With
the
low

and

reverse
brake

holding
the

rear

planet
carrier
the
rear
internal

gear

splined
to
the

output
shaft
turm

counterclockwise
in

a
reduction
ratio

ofapproximately2
18
to
1

Fluid
flow

Manual
Valve
4
Automatic

Tninsmission

Front

gear
set

Rear

gear
ell

Output

Input
throush
front
clutch

Held

by
low
A
reverse
brake

AT329

lW
w

Y

Front
clutch

Rear
clutch

Low
and
reverse
brake

Brake
band
servo

On
way
clutch

5
Throttle
Back

up
Valve
Low
A
reverse
brake
ON

Downshift
Valve

1st

2nd
Shift
Valve
12

6

L
Pressure

Regulator
Valve

2nd
3rd
Shift
Valve

10

AT

8
AT085

ON

OFF

ON

OFF
Preuwe
release

o

ernmnin

F
AT
9
M
hanical

Operation
during
R

Range

13
2nd
3rd
Shift
Valve

L

1st
2nd
Shift
Valve

I
Throttle
Back

up
Valve

y
Low
Reve
Brake

Band
Servo
Release
Side

11
Front

Clut
h

I

DI
RANGE
LOW

GEAR

Po
r
flow

With
the
shift
selector
in
0
low

gear
engine
torque
is

traJWnitted

through
the

applied
rear

clu
tch
to
the

internal

gear
of
the
front

gear
set
The

c1o
kwise
rotation

o
f
the

front
inter

naI

gear
causes
the
front

planet
gears

to
rotate
clockwise

driving
the

com

pound
sun

gear
counterclockwise
The

front

planetary
carrier
is

splined
to
the

output
shaft
This
cau
the

planet

gears
to
drive
the
sun

gear
instead
of

walking
around
the
sun

gear
This

counterclockwise
rotation
of

the
sun

gear
causes
the
rear

planet
gears
to

rotate
clockwise
With
the
one

way

clutch

holding
the
rear

planet
carrier

the
rear

planetary
gears
turn
the
rear

internal

gear
and

output
shaft
clock

wise
in
a
reduction
ratio

of

approxi

mately
2
46
to
L

Fluid
flow

Manual
Valve

2

3
Automatic
Transmission

Fiont

gear
set
Rear
gear
set

Input
t1uOllsh

rear
clutch

Output
shaft

Held

by
on
way
clutch

Input
from
front

gear
set

Output
to
real

gear
set

AT330

1

J

ld

AT081

Front
clutch

Reu
clutch

Low
and
revcrx
brake

Brake
band
servo

Onto

way
clutch
OFF

ON

OFF

OFF

HOLDING

Fig
AT
12

MochanicaIOp

rationduri

DJ
Ra

Governor
Valve

Pressure
Modifier
Valve
15

2nd
3rd
Shift
Valve

lst
2nd
Shift
Valve

2nd
3rd

Timing
Valve

1st

2nd
Shift
Valve

j
Rear

Clutch

I

Second
Lock
Valve

Second
Lock

Valve

LOrifice

Check

Valve
2nd
3rd

Shift
Valve

AT12

D2

RA
NGE
2ND
GEAR

Power
flow

In

02
range
the

brake
band
is

applied
to

hold
the

connecting
shell

and
sun

gear
stationary
Engine

torque
through
the

applied
rear
clutch

is
delivered

to
t
he
int

D
1l

1
gear
of
the

front

gear
set
in
a

clockwise
rotation

Clockwise
rotation
of
the
internal

gear

causes
the

planet
gears
to
walk

around
the

stationary
sun

gear
in

a

clockwise
direction
This
causes
the

output
shaft
which
is

splined
to
the

front

planet
carrier

to
turn
ina
clock

wise

direction
with

a
reduction
ratio

of
about
I
46
to
I

Fluid
flow

As
car

speed
and

governor
pressure

increase
the

governor

pressure
acting

on
the
end
of
the
1

2
shift

valve

Manual
Valve
I
Automatic
Tra

l
mission

Front

Bear
set
Rear

gear
set

Input
throuah
rear
clutch

AT331

1f

j
cW
oo
w

I

ATD79

Front
Clutch

Rearc1utch

Low
and
reverse
brake

Broke
band

One
way
clutch
OFF

ON

OFF

ON

OFF

AT447

F
S
AT
14
MechanicalOperation
during

DJ
Range

overcomes
the
force
of
the
1
2

shift

valve

spring
and
line

pressure
This

allows
the

1
2
shift

valve
to
move
to
the

upshift
position
which
directs
line

pressure

through
the

2nd
lock
valve

and

on
to
the
brake
band

Governor
Valve

15
Pressure
Modifier
Valve

2nd
3rd

Timing
Valve

2nd
3rd
Shift
Valve

1st
2nd
Shift
Valve

econd
Lock
Valve
9

Band
Servo

I
Apply
Side
1st
2nd
Shift
Valve
8

l
Rear

CIutclt

I

Second

Lock
Valve
2

3
Second
Lock
Valve

L

Orifice
Check
Valve
2nd
3rd
Shift
Valve

AT
14

Automatic
Transmission

D3
RANGE
3RD

GEAR

Front

gear
set
Rei
r

gear
set

Input
through
flODt

and
rear
clutches
Power
flow

In

D3
range
engine

troque
is

transmitted

through
both
clutches

The

front
clutch
turns
the
internal

gear
of
the
forward

gear
set
clockwise

The

rear
clutch

turns
the

sun

gears
in
a

clockwise
direction
also

With
both
the

internal

gear
and
the
sun

gear
of
the

forward

gear
set

turning
in
the

same

direction
at
the
same

speed
the

planet

gears
are
locked
in

position
and
turn

as
a
unit
The

output
shaft

spIined
to

the
forward

planet
carrier

turns
at
a

ratio
of
L
Output

shaft

AT332

Front
clutch

ON

Ij
1f

Front
clutch

Rear
e1utd

Low
reverse

brake

Brake
band

On

way
clutch
ON

ON

OFF

OFF
Pressure
rdeaJe

OFF
A

T083

Fill
AT
I6
Mechanical

Operation
hiring
D

Ronge

Fluid
flow

Governor

pre
ure
increases
to
the

poinl
that
it

can
overcome
the
com

bined
forces

of

spring
and
throttle

pressure
and
move
the
2nd
3rd
shift
valve
When
the
2nd
3rd
shift
valve

opens

pressure
passes
through
the

valve
lands
to
the
2
3

timing
valve
and

on
to

apply
the
front
clutch
and
release
the
brake
band
The
car
is
now

in

D3
or
direct
drive
the
rear
clutch

was

already

applied

Manual
Valve
I
Governor
Valve
IS
Pressure
Modifier
Valve

2nd
3rd

Timin8
Valve

2nd
3rd
Shift
Valve

ht
2nd
Shift
Valve

1st
2nd
Shift
Valve
8
Second
Lock
Valve

9
Band
Servo

Apply
Side

2
i

I

I

Band
Servo
is
released

t

Second
Lock
Valve

L

Orifice
Check
Valve
2nd
3rd
Shift
Valve
10

r
Band
Servo
Rele

Side

I

L
2nd
3rd

Timing
Valve
I
I

I
Front
Clutch

I
J

Second
Lock
Valve
I
Rear
Clutch

I

3

AT

16

Automatic
Transmission

2
RANGE

2ND

GEAR

The

range
2

position
is
used
to

lock
the
car
in

2nd
gear

preventing

upshifts
or
downshifts
under

any
con

ditions
Fluid
flow

opening
the
valVe

and

alloWing
pr

sure
to

p
into

the
line
of
the

throttle
valve
thus

assuring
adequate

throttle

pressure
even

during
decelera

tion

J
he
downshift
solenoid
valve
is

used
as
a

passage
for
line

pre
re
to

lock

the
1

2
and
2
3
shift
valves
Po
r
flow

Power
flow
in
2

raogo
is
the
same

as
in

D2
range
Uoe

pressure
from
the

manual

valve

opens
the
second

lock
valve

against
spring

pressure
As

this
valve

opens
pressure
the
passes
to

apply

the
band
servo
Une

pressure
also

flows
to
the
throttle
back

up
valve

UlllV
I
Governor
Valve

IS
Pressure
Modifier
Valve

2nd
3rd

Timing
Valve

2nd
3rd
Shift
Valve

1st

2nd
Shift

Valve

1st
2nd
Shift
Valve

j
Rear
Clutch

2

1
Band
Servo

Apply
Side

l

Solenoid
Downshift
Vilve

1312nd
3rd
Shift
Valve

1st

2nd
Shift
Valve
Second
Lock
Valve
9

4

Throttle
Back

up
Valve
17

Vacuwn
Throttle
Vilve
16

l
Jre
ModifJerVilve

2nd
3rd
Shift
Valve

2nd
3rd

Timing
Valve

Throttle
Drain
Valve

Pressure

Regulator
Valve

AT
20

Automatic
Transmission

l
RANGE

LOW
AND
2ND
GEAR
second

12
afwvernor
preSsure
pre

vents
the
I
2

shift
valve
from

closing

The

range
1

position
is
used
to

lock
the

car
in
1st

gear
preventing
any

upshifts
If
the
selector
lever
is

moved

to
the
I

position
while
the
car
is

moving
at

high

speeds
the
transmis

sion

w
ill
not

shift
into

first

gear
until

car

speed
slows
to

approxiniately
55

km
h
35

mph
Instead
it
will
shift
to
Po
r
flow

The

power
flow
in

11
differs

slight

ly
from

01
in
that

the
low
and

reverse

band

is

applied
to
hold
the

rear

gear

set

planet
carrier

providing
engine

hraking
Power
flow

in

12
is
the
same

a

io02

Manual
Valve
Governor
Valve
15
Pressure
Modifier
Valve
I
Fluid
flow

Lolft
ar

Manual

pressure
passing
through

the
1

2
shift
valve
is

used
to

close
the

1
2
shift
valve

preventing
a
1
2

up

shift

Manual

pressure
pusing
through

the

downshift
valve
lock
the
2

3
siuit

valve
closed

along
with

applying
addi

tional

closing
pressure
to
the
I
2

shift

valve

2nd
3rd

Timing
Valve

2nd
3rd
Shift
Valve

lst
2ndSti
ft

Valve
1st
2nd
Shift
Valve

iRea
Clutcb

I

4
Solenoid
Downshift
Valve
13

I2nd
3rd
Shift
Valve

ht
2nd
Shift
Valve

Throttle
Back

up
Valve

5
C

1st
2nd
Shift
Valve
12

I
Throttle
Back

up
Valve

y
Low
Reverse
Bra1ce

I

Fluid
flow
2nd
ar

Manual
Valve
Governor
Valve
15
Preuurc
Modjfier
Valve

2nd
3rd

Timing
Valve

2nd
3rd
Shift
Valve

1st
2nd
Shift
Valve
8
1st
2nd
Shift
Valve

Second
Lock
Valve
9

I
Band
Servo

I
Apply
Side

4
t
Rear
Clutch

I

Solenoid
Downshift
Valve
13

I
2nd
3rd
Shift
Valve

ht
2nd
Shift

Valve

Throttle
Back

up
Valve
17
PreSlure
Modifier
Valve

2nd
3rd
Shift
Valve

2nd
3rd

Timing
Valve

Throttle
Drain
Valve

s
ht
2nd
Shift
Valve
Pressure

Regulator
Valve

AT
22