1977 DATSUN PICK-UP brake

R
RANGE
REVERSE

In
R

range
the

front
clutch
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

stationary
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
Automatic
Transmission

R

Fig
AT

26
Power

tranamis
ion

during
R

range

m
i

1

A
TOBS

Fig
A
T
21

Optrationof
each
mechanism

during
R

range

When
the
manual
valve

V
is

posi

Clutch
Low

Band
servo
One

tioned
at

R

range
the
oil

having
the
Gear

Partina

Ranae
re
ne

way

line

pressure
7
is

directed
to
line
ralio

Front
Rear

brake
Openlion
Relulie

clutch
plwl

pressure
circuits
5

and
6
The

pressure
in
the
circuit
5
actuates
the
Park
on
on

low
and
reverse

brake
after

being
Ruene
2
182
on
on
on

introduced

into
line

pressure
circuit

Neutral

12

through
the
I

st
2nd
shift
valve

ID
The

pressure
in

the
circuit

op
DI
Low
2
458
on
on

erates
the
release
side
of
the
band

servo
and
the
front
c1u
tch
after

being
Driowe
D2
Second
1
458
on
on

led
to
line

pressure
circuit
0
D3

Top
1
000
on
on
on

through
the
2nd
3rd
shift
valve

@

2
Second
1
458

The
throttle

pressure
I
6
and
the
line
on
on

pressure
6
which

vary
with
the

12
Second
S8
on
on

degree
of
accelerator

pedal
depression

II
Low
2
458

both
act
the

pressure
regulator
on

on

on

valve

CD
and

press

against
its
valve

CD

increasing
line

pressure
7
In
Rn

range
the

governor

pressure
is
absent

making
all

such
valves
as
the
1st
2nd

shift
valve

ID
lnd
3rd
shift

valvc

@
and

pressurc
modifier
valve

inoperative

AT16

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

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

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

D
RANGE
2ND
GEAR
Automatic
Transmission

t
In
this
case
the

rear

c1ut
h

IS

applied
and
the
band
brake

holds
the

fronl

dUh
h
drum
the

connecting

shell
and
the
sun

gear
from

rotating

The

power
flow
lakes

place
through

the

input
shaft
into
the

rear
clutch

and

the
front
internal

gear
With
the
sun

gear
held

stationary
the
front

planeta

ry
gears
rotate

around
the

sun

gear

carrying
the
front

planet
carrier

with

them
The
fronl

planet
carrier

being

splined
to
the

output
shaft
causes

clockwise
rotation
of
the

output
shaft

at
a

reduced

speed
compared
with
the

speed
of
the

input
shaft
with

an

increase
in

torque
As
the
low
and

reverse
brake

is
not

applied
the
clock

wise

rotation
of
the

output
shaft

causes
clockwise
rotation

of
rear
inter

nal

gear
and
the
rear

planet
carrier

also

rotates
around

the
sun

gear
in

a

clockwise
direction

The
one

way

clutch

will
act

to
allow
the
clockwise

rotation
of

connecting
drum

When
the
car

speed
increases

while

running
at
D

range
I
st

gear
the

st
2nd
shift

valve

ID
moves
allow

ing
the
line

pressure
I
to
be
intro

duced
into
the
line

pressure
8

Ihrough
itself
The
line

pressure
8
is

further
led
to

the
line

pressure
9

through
the
second
lock
valve

@
and

by
locking
the
band
servo

obtains
the

2nd

gear
condition
Fig
AT
33

Power
transmission

during
Dz

range

A

T079

Fig
AT
34

Operation
of
each
mechanism

during
D

range

Clutch
Low

Band
servo
On

Patking

G

Range
reverse
w

pawl

ratio

Fronl
Rur
brake
Optrltion
Release

clutch

PlIk
on
on

Revtne
2
182
on
on
on

Neutral

01
Low
2
4S8
on
on

Drive
02
Second
1
4S8
on
on

OJ

Top
1
000
on
on
on
on

2
Second
1
4S8
on
on

12
Second
1
4S8
on
on

1

II
Low
2
4S8
on
on

AT
22

D
RANGE
TOP
GEAR
Automatic
Transmission

In
3rd

gear
position
the
front
and

rear
dUlches
are

engaged
The

power

now
takes

place
through
the

input

shaft
into
rear

clutch
drum
The
rear

clutch
drum
rotates
the

steel
drive

plates
of
the

rear
clutch
and
the
lined

drive

plates
of
the
rear
clutch
and
the

lined

drive

plates
of
the

front
clutch

The
rear
clutch
directs
the

power
flow

through
the

rear
clutch
hub
and

front

internal

gear
to
the
front

pl
net

carrier

The
front
clutch
directs
Ihe

power

now

through
the

connecting
shell
to

the
sun

gear
Wilh
the
sun

gear
and
the

rear
clutch
hub

driven
at
the
same

speed
the
front

planet
assembly
is

forced

to
rotate
the

output
shaft
at

the

same

speed
in

the
direction
to

provide
the

top
gear

When
the

car
speed
further
in

creases
while

running
at

D2
range

2nd

gear
and

the

governor

pressure

15
exceeds
the
combined
force
of

the

spring
of
the
2nd
3rd
shift
valve

@
and
the

throttle

pressure
19
the

2nd
3rd
shift
valve
@
moves
and

the
line

pressure
8
acts
to
release
the

front
clutch
and
band
servo

through

the
line

pressure
10
OJ

a

Fig
AT
36
Power
transmission

during
DJ

range

A
T083

Fig
AT
3

Operation
of
aeh
mf
hani5m
UDJ

range

Clulch
Low

Band
KrVO
One

Parking

em

Ral
8t
reverK
w

pawl

ratio

Front
Rear

brake
Operation
Rdene

clutch

Park
on
on

Reverse
2
182
on
on
on

Neutral

01
Low
24S8
on
on

Drive
02
Second
1
4S8
on
on

03
Top
1
000
on
on
on
on

1
Second

t
4S8
on
on

12
Second
1
458
on
on

t

I

Lo
2
458
on
on

AT
24

0
RANGE
KICKOOWN
Automatic
Transmission

f

r

t
While

operating
at

speeds
below

appruximately
80
to
90

kmfh
50
to

55
MPII
a
kick
3rd
2nd
downshift

an
be

accomplished
by
fully
de

pressing
the
accelerator

A
kick
3rd
lst
or

2nd
lst

downshift

can
also
be

accomplished

below

approximately
40
to
50

kmfh

25

to
30
MPII

When
kickdown
is

performed
the

push
rod

operates
by
the
solenoid
the

valve
is

depressed
downward
and
the

circuit
from
the

hne

pressure
7
to

the
hne

pressure
13
opens
The
h
e

press
e
13
3

plus
the
force
of
the

2nd
3rd
shift
valve

spring

oppose

the

governor
pressure
15
at

thc

2nd
3rd
shift
valve

@
and

thus

performs
3rd
2nd
downshift

op

eration

Moreover

the
hne

pressure
13

plus
the
force
of
the
lst
2nd
shift

valve

spring
oppose
the

governor
pres

sure
15
at
the
I

st
2nd
shift
valve

ID
and
thus

perform
3rd
2nd
or

2nd
st

downshift

operation
f
Cur
Clutch

La
Band
servo
On

Parll
lnl

Ran
e
rf
ltr5e
w

pawl

nUo

Fronl
Rear
brake
Opcullon
Release

clutch

Park
on
on

Reverse
2
82
on
on
on

Neutral

Dt
low
2458
on
on

Drive
02
cond
1
458
on
on

D

Top
t
ooo
on
on
on
on

2
Second
1458
on
on

12
Second
1
458
on
on

t

tl
low
2
4

8
on
on

AT
26

2
RANGE
2ND

GEAR
Automatic
Transmission

In
2

range
the

gear
rario
is

IOI
keJ

III
the
2nd

forward

speed
In

this
case

the
rear

dutch
is

engaged
and
the

band

brake
holds

the
front

clutch
drum
the

connecting
shell
and
sun

gear
from

rotating

The

power
flow
takes

place

through

the

input
shaft
inlo

the

rear
clutch

and

the
front
internal

gear
With
Ihe

sun

gear
held

stationary
the
front

planetary

gears
rotate
around

the
sun

gear
carrying
the

front

planet
carrier

with
them
The
front

planet
carrier

being
splined
to
the

output
shaft

causes
clockwise
rotation

of
the
OUI

put
shaft
at
a

reduced

speed

compared

to
the

speed
of
the

input
shaft
with

an
increase
in

torque
As
the
low
and

reverse

brake
is
not

engaged
the
clock

wise

rotation
of

the

output
shaft

causes
clockwise
rotation

of
fear
inter

nal

gear
and

the
rear

planet
carrier
also

rotates
around

the

sun

gear
in
a

clockwise

direction
The

one

way

clutch

will
act

to
allow

clockwise

rotation
of

connecting
drum

When
the

manual
valve

V
is

posi

tioned
at
2

the
line

pressure
7
is

introduced
into

the
line

pressure
cir

cuits
I
2

and
4

The

line

pressure

I
is
led

to

the

governor
rear
clutch

and

I
st

2nd
shift
valve

CID
as
in
the

case
of

D

range
The

line

pressure

2
locks

the
second
lock

valve

@and

is
led
to

thc

tightening
side
of
Ihe

band

servo

The

2nd

gear
is

therefore
fixed

regardless
of
vehicle

speed
When

DJ

range
3rd

gear
is

shifted
to
2

range
the

line

pressure
4
enters
Ihe

throttle

back

up
valve

V
and

produces

a

high
pressure
in
the
circuit
17

increasing
thc

throttle

pressure
li
6

The

line

pressure
7

is

therefore

increased

and

quickly
tightens
the

band

N

e

DJ
range
3rd

gear
to
2

range

If

DJ

range
3rd

gear
is

shifled

to
2

range

during
operation
the

manual
valve

V
is
also
shifted

to
A

T078

Fig
AT

40
Powu

tTansminion
during
2
H

range

A
1079

Fig
AT
41

Operation

of
each
mechanism

during
2

range

Clutch
Low

Band
ser
o
On

Parking
Gw

Ran8t

utio
w

pa

Front
Rear

brake
Operalion
Release

dutch

Pui
on

on

Revtrs
e

2
182
on

on
on

Neutral

01
Low

2
458
on
on

Drive
02
Second

1
458
Oft
Oft

OJ

Top
1
000
on
on

on
on

1
Second

1
458

on
Oft

12
tocond
1458

on
on

J

tt
Low
2
458

on
on

2

position

causing
the
line

pres

sure
circuit
3
to

be
drained

Therefore
the

line

pressure
circuit

10
which
is

situated
at
the

release

side
of
the
front
clutch

and
servo
is

also

drained

through
the
2nd

3rd

shift
val

e
@

forcing
the

speed
to

AT
28
decrease
from
3rd

gear
to
2nd

gear
In

this
case

the

speed

change

quickly
takes

place
because
the
line

pressure
7

and
other

pressure
are

heightened
by
the
action
of
the
line

pressure
4
in

the
same

manner
as

described
under
2

range