1977 DATSUN PICK-UP automatic transmission

R
range
Reverse

Torq
Con

Oil
Cool
r

A
r

Lubt

lcetlon

0

II
iL
Vel

o

Front

or
ln

l

n

jL
r

x

Q

A
uletor

Val

NIJte
kld
Automatic
Transmission

@
2nd
3n
l

Timl
lil

1i
II

r

U

nu

r
l3
ni

II

15
15
Front

Cll
ltc
Il
Low

a
Aev

Br
k

B
k

II
I

LJ

2f
ID
p
Mc
e
lf
v

If
I
I

CID
VEL
1

Thrc

r

V
I

I

11
1

IU

T
R

Clutch

f

r

Ir
l
II

Orlflc

Check

Velve

22

n
@lnd
3rdShlft

v

D
h
III

r
r
I

I

111

L

Ll
p
O
nOl
f
t

p
r

Goy
norpreat
l

Torque
Ilrfl

r

Throttl

D
ln

v

5

1

O
eln

rmrp

Throttl
p
a
nor
v
11

J

I

t

Q
V

1ve

Fig
A
T
28
Oil

preBBure
circuit

diagram
R

range
Reverie

AT
17

N
RANGE

NEUTRAL

In

N

range
none
of

the
clutches

and
band
are

applied
thus
no

power
is

transmitted
to

the

output
shaft

The

pressure
of
oil

discharged
from

the
oil

pump
is

regulated
by
the

pressure
regulator
valve

Dto
maintain

the
line

pressure
7

and
the
oil
is

led

to
the
manual
valve

@
vacuum
throt

tie
valve

@
and
solenoid
down
shift

valve

@
The
oil
is
further
introduced

into

the

torque
converter
at
its

op

erating

pressure
14
and
a

portion
of

this
oil

is
distributed
to
each

part
as

the
front
lubricant
The
oil
which
has

been

discharged
from
the

torque
con

verter
is

also
distributed
to
eacn

part

as
the

rear
lubricant

As
the
oil

pump
rotates
at
the
same

speed
as
the

engine
the
oil

pump

discharge
increases
with

engine

speed

But
the

surplus
oil
is
returned
to
the

oil

pan
by
the

pressure
regula
tor
valve

D
Automatic
Transmission

Geu
Clutch
Low
4

Band
crvo
One

Pultin

R

atio
WI

pawl

Front
Rear

brake
Operation
Release

clutch

Park
on
on

Reverse
2
182
on
on
on

Neutral

Dt
Low
2
458
on

on

Drive
D2
Second
1
458
on
on

m

Top
1
000
on
on

on
on

2
Second
1
458
on

on

12
Sec
ond
1
458
on
on

II
Low
2
458
on
on

AT
la

Automatic
Transmission

P

range
Park

Front

Cluteh
1
1

Brllk

ar

Bond

Torqu
Con

u

o

ID
VK

Th
o

I

V
II
IftY

all
Coo

II

I

Front

Lubrk
It
n

Orltlc

Check

V
A

L
b
k

tlon

1

e

O
ln

I

ThrOttle

D
ln

V

21

j
r

tUI
lor
V
h

@

V
hI

N01
M
rked
X
r
D
ln
5

I

I

I
X

Line
pr

Go
nor
t
d
pr

L
J

Q
RO
p

c
J

Torq
co
p
f

Th
ottl

p
Iecond
y

Ocw
no
V

Gover
V

Fig
A
T
25
Oil

pressure
circuit

diagram
P

range
Park

AT

IS

Automatic
Transmission

R
RANGE
REVERSE

R

In
R

range
the

front
dutch
and

the
low
and

reverse
brake
are

applied

The

power
flow
is

through
the

input

shaft
front
clutch
and

connecting

shell
to

the
sun

gear
Clockwise
rota

tion

of
the

sun

gear
causes
counter

clockwise
rotation
of
the
rear

planeta

ry

gears
With
the

connecting
drum

held

Slationary
by
the
low
and
reverse

brake
the
rear

planetary
gears
rotate

the
rear
internal

gear
and
drive
the

flange
counterclockwise
The
rear

drive

flange
splined
to
the

output
shaft

rotates
the

output
shaft
counterclock

wise
at

a
reduced

speed
with
an

increase
in

torque
for
reverse

gear

f

When
Ihe
manual
valve

CV
is

posi

tioned
at
R

range
Ihe
oil

having
Ihe

line

pressure
7
is

directed
to

line

pressure
circuits
5
and

6
The

pressure
in

the
circuit
5
actuates
the

low
and
reverse
brake
after

being

introduced
into
line

pressure
circuit

12

through
the
I
st

2nd
shift
valve

@
The

pressure
in
Ihe

circuit

op

erates
the
release
side
of
the
band

servo
and

the
front
clutch
after

being

led
to

line

pressure
circuit

10

through
the
2nd
3rd
shift
valve

@

The
throtlle

pressure
16
and
the
line

pressure
6

which

vary
with
the

degree
of
acceJerator

pedal
depression

both
act

on
the

prcssure
regulator

valve

CD
and

press

against
its
valve

CD

increasing
line

pressure
7
In
R

range
the

governor

pressure
is
absent

making
all
slldl

valves
as
the
J
SI

2nd

shift
valve

@
2nd
3rd
shift
valvc

@
and

pressure
modifier
valve

j

inoperative
C

Fig
AT

26
Power

transmi
ion

during
R

range

A
TOS5

Fig
AT
27

Operation
attach
mechanism

during
R

range

G
Clutch
Low
A

Band
servo
One

Parkin

Ran
no
wa

plwl
ratio

Front
Rear

brake

Operllioo
Rdr
ue

clutch

k
on
on

Revctte
1
181
on
on
on

Neutnl

DI
Low
1
418
on
on

Driw
D2
Second
1
458
on
on

DJ

Top
1
000
on
on
on
on

2
Second
1
458
on
on

12
Second
1
458
on
on

I

II
Low
2
458
on
on

AT
16

R

range
Reverse
Automatic
Transmission

TOl
QuaConverter

o

IIi
0

ou

14

Q

FI
Lu

IUt
O

Front

Lub
lc

O
lnV
ly

R
MO
V
l
Front

Clutdt
LowaoA

B
k

e
k

B

Clutch

ID
VK

n

V
lv
@
ftV
1

I

j

Throttle

O
in

V
Otlflce

Check

V
III

@lnd
3rdShih

V

zz

@
2nd
rd
TIm

If

V
Iy

Second
Lock
V

3
I

Zl

Not

M
k
d
X
er
0
1

LI
p
O
nOf
f

P

G
preau

I
J

Torqu
0
0
pr

Throttl

p
1
s
co

O
V
0

O
V

Fig
A
T
28

AT
17
Oil

pressure
circuit

diagram
n
II

range
Reverse

N
RANGE
NEUTRAL
Automatic
Transmission

In
N

range
none
of
the
clutches

and
band
are

applied
thus

no

power
is

transmitted
to
the

output
shaft

The

pressure
of

oil

discharged
from

the
oil

pump
is

regulated
by
the

pressure
regulator
valve

CD
to
maintain

the
line

pressure
7
and
the
oil
is
led

to
the
manual
valve

V
vacuum
throt

tle
valve

@
and
solenoid
down
shift

valve

@
The
oil
is

further
introduced

into
the

torque
converter
at
its

op

erating
pressure
14
and
a

portion
of

this
oil
is
distributed

to
each

part
as

the
front
lubricant
The
oil
which
has

been

discharged
from

the

torque
con

verter
is
also
distributed

to
eacn

part

as
the
rear
lubricant

As

the
oil

pump
rotates
at
the
same

speed
as
the

engine
the
oil

pump

discharge
increases
with

engine
speed

But
the

surplus
oil

is
returned
to
the

oil

pan
by
the

pressure
regulator
valve

CD
G
Clutch
Low

Band
servo
One

Pukiq

R
w

pawl
ntlo

Front
Rur

br
ke
Optruion
Release

clutch

PIlIi
on
on

Reverse
2
182
on
on
on

Neut
1

01
Low
2
458
on
on

Drive
02
Second
t
458
on
on

03

Top
1
000
on
on
on
on

2
Setond
1
458
on
on

12
Second
1
4
58
on
on

1

II
Low
2
458
on
on

AT

18

Automatic
Transmission

N

ranee
Neutral

I
a

a

8

nd

011
Coolei
VK

Th

o

Vtlv
J
@

Vtlv

I

I
D
ln

Ol
v
Lubrlc
tlon

11

I

OIIt

Lubrlut

O
lfIC

Check

Vtlv

D
lnV

I

T
uott

O
in

v

8Jl

12

ht
2nd
Shift
y
tve

5

CD

Rl9UlttO
Vtlv

Nott
M
rked
X
r
D
in

liia

1
or

IOo
nOf
fNd
IH

oov
no

p

c
z
Torqu
con
er

pr

Throttl
p
s
cond

y

a

Ol
V
o
V
tve

Fig
AT
29

AT
19
Oil

pressure
circuit
diagram
N

range
Neutral

D
RANGE
LOW
GEAR
Automatic

Transmission

The
low

gear
in
D

range
is

somewhat
different

from
that
in
I

range

The
rear

c1utdl
is

applied
as
III

I

range
but

the
one

way
clutch

holds

the

connecting
drum
The

power

now
is

the
same
as
in
1

J
range
That

is

the

power
now
takes

place

through

Ihe

input
shaft
and
into

the
rear

clutch
The

input
shaft
is

splined
to

the

rear
clutch

drum
and
drives
it

Rotation
of
Ihe

rear
clutch
drives
the

rear
clutch
hub

and
front
internal

gear

The
front
internal

gear
rotales
the

front

planetary
gears
clockwise

to

cause
the
sun

gear
to
rotate
counter

clockwise

Counterclockwise

rotation

of
the

sun

gear
turns
the

rear

planetary

gears
clockwise

With
the

rear

plane

tary
carrier

held

stationary
by
the

one

way
clutch
the
clockwise

rotation

of

the
rear

planetary
gears
rotates
the

rear
internal

gear
and
drives

the

flange

clockwise
The

internal
drive

flange
is

splined
to
the

outpul
shaft
and
rotates

the

output
shaft
clockwise

When

the
manual
valve
is

posi

tioned
at
D

the
line

pressure
7

introduced

into
the
manual

valve
is

led

to
the
line

pressure
circuits

l
2

and
3

The

pressure
in

the
circuit
I

acluates
the
rear

clutch
and
the

gover

nor
and
al
the

same
time

operates
the

1st

2nd
shift

valve

CID
to

change
the

speed
The

circuit
2

leads
to

the

second
lock

valve

@
The

circuit
3

actuates

the
2nd
3rd
shift

valve

@

for

the
2nd
3rd

speed

change
and

at
the
same

lime
locks
the

second

lock
valve

@

The

throttle

pressure
16
which

changes
with
the

degree
of
accelerator

pedal

depression

presses
Ihe

pressure

regulator
valve

CD
and

increases
the

line

pressure
7

When

Ihe

speed
of

the

vehicle
has

increased
the

governor

pressure
15

introduced
from

the
line

pressure
circuit
I

actuates
the

I

SI
2nd

shift
valve

CID
2nd
3rd

shift

valve

@
and

pressure
modifier

valve

ID
When
the

governor

pressure

is

high
the

pressure
modifier
valve

ID

acls
in

such
a

direction
as

to

compress

the

spring
and

the

throttle

pressure
is

led
to
the

throttle

pressure
18
This
ATOSO

Fig
AT
30
Power

transmission

during
D

J

range

liIIl

I
IW
L

AT08l

Fig
AT
31

Operation
of
each
mechanism

during
VJ

range

Clutch
low
Band
servo
On

Parking
Cur

Ran
Rllelle

way

pawl
ratio

Front
Rur

brake
Operation
Rekase

ch
lch

Park
on

on

RellerK
2
t82
on
on
on

Neutral

01
low
2
S8
on
on

Orivt
02
Second

1
458
on
on

OJ

Top
1000
on

on
on
on

2
Second
1
458
on
00

t2
Second
1
458
on
on

t

tt
low
2
458
on
on

pressure
acts

against
the
force

of
the

spring
of

the

pressure

regulator
valve

CD
and

also

against
the

throttle

pres

sure

16
thus

lowering
the
line

pres

sure
7

The

governor

pressure
also
increases

with
the

speed
of
Ihe

vehicle

exerting

a

pressure
on

one
side
of

the

lst
2nd
shift
valve

and
counter

acts

the
Ihrottle

pressure
19

line

pressure

AT
20
l
and
the

spring
which

are

exerting

against

t
1e
governor

pressure
There

fore
when

the

governor

pressure
ex

ceeds

Ihis

pressure
the

speed
is

shifted

from

the
I
st

gear
to

the
2nd

gear

The
further
the

accelerator

pedal
is

depressed
the

higher
becomes

the

throttle

pressure
19

increasing
the

governor
pressure
and

shifting
the

speed
change
point
to

the

higher
side