1977 DATSUN PICK-UP torque

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

0

range
Low

gear

Torque
Conven
Front

Clul
L
A

e

B

6
Clutch

I

Q

011

Cool
TIC
011

p

V

RUf

LubtJuflon

n

Ii
IO
lln

V
l

F

ont

Lub
lclt
n

D
nV

l

ThroW

0
1

V

I

Q
P
P

tOO
V

Note
U
X
Ir

or
n

Llnep
IO
nor
feed

GoY
no
p

Torque
co

p

Th
on
I

ID
v

Th
O

V

Orifice

V

L

13

t

12

tt
2NtSt
llttY

5

i

Iecotodary
Y

QoY
nOl
V
Oew
roo
v

Fig
A
T
32
Oil

pressure
circuit

diagram
uD

1
range
Low

gear

AT
21

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

Automatic
Transmission

I

M
nual

f4fL
J

0
I
1
r

PR
0

range
kickdown
Shift
valves
In
2nd
gear
position

To

queeO
t
Front

Clutch
Low
a

A

8

8
e
e

a

o

14

0

Oil

COO

R
L
ubrication

n

0

Drain
1
4

j

v

I

Front

Lub
icet

p
n
o

I

Thron

p
ain

V

I

j

R
gu
ato
V

I

Not
Ma
ked
X
r
p
n

Li
pr
IGo
no
f
d

p
l

Governor
p

c
Torque
CO
I
1

p

ThrOWepr
VK

Th
o

V
lv
7
1

iftV
8
Throttle

BKk
up

V
hl
ID
So
e

COw

P
Ifk

Check

V

I

1
24
5
Mod
Yo

I

@2nCl
3rdSl
lilr

V

12

3
ht
2nd
Shih
V

5

L

I
X

S
COnd

Primary

G
rw
Va
Gov
nor
Valve

AT
27
Fig
AT
39
Oil

pressure
circuit

diagram
D

ronge
kickdown
shift
values
in
2nd

gear
position

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

Automatic
Transmission

2

range
2nd

gear

Torqu
Con
Fron

Clutch
l

ow
A

B
ke

Br

I

12

011

Cool
i

IL
12

ID
v

Th

ot

Valve
7
T
onl

Beck

up

V
ID
So

0
Id

1ft
v

Front

Lubric
t
Orltic

Check

Va

Or
lnVal
e

Throttle

Dr
in

V
l
P
Modif
Va

15

BJl

@
2nct
3rd
Tim

If

Ve

12

3
1
2nd
Stolt

21

Se
onc
l
Lock
Va

3
I

PR
02

1
s
I
Jl
J
I
r

A
ul
Gr
v

2
w

Valve

Note
Merltedl
D
a
n

I

G
v
Line
p
IOo
nOf
f
d
pr

G
no

p
r

c
o
Torque
con
pr

Thron

p
re
ond

a
nor
v

Fig
A
T
42
Oil

pressure
circuit

diagram
2

range
2nd

gear

AT
29

Automatic
Transmission

REMOVAL
AND
INSTALLATION

TRANSMISSION
ASSEMBLY

REMOVAL

INSTALLATION

TRANSMISSION

ASSEMBLY

When

dismounting
the
automatic

transmission
from

a
vehicle

pay
at

tention
to
the

following
points

1

Before

dismounting
the
trans

mission

rigidly
inspecl
it

by
aid
of
the

Troubleshooting
Chart
and
dis

mount
it

only
when
considered
to
be

necessary

2
Dismount
the
transmission
with

utmost

care
and

when

mounting

observe
the

tightening

torque
indi

cated
on
another
table
not
to
exert

excessive
force

REMOVAL

In

dismounting
automatic
transmis

sion
from
vehicle

proceed
as
follows

I

Disconnect

battery
ground
cable

from
terminal

2

Disengage
torsion
shaft
from
ac

celerator

linkage

3
Jack

up
vehicle
and

support
its

weight
on

safety
stands
Recommend
a

hydraulic
hoist
or

open
pit
be
utilized

if
available

Make
sure
that

safety
is
insured

4
Remove

propeller
shaft

Note

Plug
up
the

opening
in
the
rear

extension
to

prevent
oil
from

flowing
out

5
Disconnect
front
exhaust
tube

6

Disconnect
selector

range
lever

from
manual
shaft

7

Disconnect
wire

connections
at

inhibitor
switch
CONTENTS

AT
33

AT
33

AT

33
TRANSMISSION
CONTROL
LINKAGE

REMOVAL
AND
INSTALLATION

ADJUSTMENT
AT
35

AT
35

AT
35

8
Disconnect
vacuum
tube

from

vacuum

diaphragm
and
wire

connee

lions

at
downshift
solenoid

9
Disconnect

speedometer
cable

from

rear
extension

10
Disconnect
oil

charging
pipe

II
Disconnect
oil
cooler
inlet
and

outlet
tubes
at
transmission

case

12

Support
engine
by
locating
a

jack
under

oil

pan
with
a
wooden

block
used
between

oil

pan
and

jack

Support
transmission

by
means
of
a

transmission

jack

13
Detach
converter

housing
dust

cover
Remove

bolts

securing
torque

converter
to
drive

plate
See

Figure

AT
4

AT261

Fig
AT
47

Removing
torque
conv
rter

attaching
bolts

Note
Before

removing
torque
con

verter
scribe
match
marks
on

two

parts
so
that

they
may
be

replaced
in
their

original
posi

tions
at

assembly

14
Remove
rear

engine
mount

securing
bolts
and
crossmember

mounting
bolts

15
Remove

starter
motor

16
Remove
bolts
securing
transmis

sion
to

engine
After
removing
these

AT
33
bolts

support
engine
and
transmission

with

jack
and
lower
the

jack
gradually

until
transmission
can
be
removed
and

take
out
transmission
under
the
car

Note

Plug

up
the

opening
such
as
oil

charging
pipe
oil
cooler
tubes

etc

INSTALLATION

Installation
of
automatic
transmis

sion
on
vehicle
is

reverse
order
of

removal
However
observe
the
follow

ing
installation
notes

Drive

plate
runout

Turn
crankshaft
one
full
turn
and

measure
drive

plate
mnou
t
with

indi

cating
finger
of
a
dial

gauge
rested

against
plate
See

Figure
AT
48

Replace
drive

plate
if

in
excess

of

0
5
mm
0

020
in

Maximum

allowable
mnout

0
3

mm
0
012
in

A
T262

Fig
AT
48
MeCJ
uring
drive

plate

runout

2
Installation
of
torque
converter

Line

up
notch
in

torque
converter

with
that
in
oil

pump
Be
extremely

careful
not
to
cause
undue
stresses
in

parts
in

installing

torq
e
converter

See

Figure
AT
49

Starter

should
be

brought
into

op

eration

only
when
selector

lever
is
in

P

and
N

positions
it

should
not

be
started

when
lever
is
in
D
2

I

and
R

positions

Back

up
lamp
should
also

light

when

selector
lever
is

placed
in

R

position

S
After

converter
is
installed

rotate

10

Check
level
of
oil
in
transmis

crankshaft
several
turns
and
check

to

be
sure
that
transmission

rotates

freely
sion

For
detailed

procedure
see

page

AT48

without

binding

6
Pour

recommended
automatic
II

Move
selector
lever

through
aU

positions
to
be

sure
that
transmission

transmission

fluid

up
to
correct
level

operates
correctly

through
oil

charge
pipe

verter
to
transmission
measure

dis

With
hand

brake

applied
rotate

tan
A

to
be
certain

that

they
are
7

Connect
manual
lever
to
shift

engine
at

idling
Without

disturbing

correctly
mbi
d

S
F
rod

Opeiationsliould
oecaTrie
f
bue

the
above

sclUng
ffiovTSelector
lever

AT

50
with

manual
and
selector
levers
in

through
N

to
D
to
2

to
I

Distance
A
N

and
to
R
A

slight
shock
should
be

More
than
21

5
mm
0
846
in
8
Connect

inhibitor
switch
wires

felt

by
hand

gripping
selector

each

time
transmission
is
shifted
Automatic
Transmission

4
Bolt
converter
to
drive

plate

Note

Align
chalk
marks

painted
a

cross
both

parts
during
disas

sembling

processes

AT116

Fig
AT
49

Torque
converter

aligning
cu
t

3
When

connecting

torque
can

A

ATl17
Notes

a
Refer
to

covering
topic

under

Checking
and

adjusting

inhibitor
switch
n

on

page

AT
49

b

Inspect
and

adjust
switch
as

above
whenever
it
has
to

be

removed
for
service

Fig
AT
50

Installing

torque
converter
9
Check
inhibitor
switch
for

op

eration

AT
34
Note

See

page
AT

49
for

checking

engine
idling

12

Check

to
be

sure
that
line

pres

sure
is

correct
To
do
this

refer
to

relative

topic
under

Testing
line

pres

sure
on

page
AT

52

13

Perform

stall

test
as

per
the

instructions

on

page
AT

50