1977 DATSUN PICK-UP automatic transmission

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

1
RANGE

LOW
GEAR
Automatic

Transmission

f
Wilen

slJrting
in
I

range
the

drlvlIlg
gear
is
IOl
ked

to

the
low

gear

fJIIIJ

In
H

range
the

rear

clutch
is

engJged
and

the
low
and
reverse
brake

hulds
he

onnecting
drum
and

feac

planet
carrier
from

rotating
The

power
tlow
lakes

place
through
the

input
shaft
and
into
lhe
rear

clutch

ROlalion

of
the
rear
clutch

drives
lhe

rear
dutch
hub

and
front
internal

gear

The
front

internal

gear
rotates
the

front

planetary
gears
clockwise
to

cause
the

sun

gear
to

rotate
counter

clockwise

Counterclockwise

rotation

of
the

sun

gear
turns
the
rear

planetary
gear

clockwise

The

rear

planet
carrier

splined
to

the

connecting
drum
is
held

from

rotating
by
the

low
and

reverse
brake

The

clockwise
rotation

of
the
rear

planetary

gears
therefore

rotates
the

rear

internal

gear
and

internal

drive

tlange
The

internal
drive

tlange
is

splined
to

the

output
shaft
and
rotates

the

uutput
shaft
clockwise
However

the

output
shaft
rotates

at
a

lower

speed

compared
to
that

of
the

input

shaft

This
is

caused

by
the
fact

Ihat

the

front

planet
carrier

rotates
at

the

same

speed
as
Ihe

OUlput
shaft
in
the

same
direction

since
the
carrier

is

splined
to

the

output
shaft
The
front

internal

gear
and

planetary
gear
assem

bly
are

rotating
in

the

same
direction

but

the

planet
carrier
is

rotating
at

a

speed
slower
than
the

ring

gear
So
the

gear
ralio

of
this

speed
range
is

a

combination
of
the
ratios

provided

by

the
front

and
rear

planetary
gear
as

semblies

When
the

manual
valve

Vis

posi

tioned

at
I

the
line

pressure
7

is

applied
into

the
line

pressure
circuits

I

4

and
5
The
oil

pressure
in
5

actuates
the
luw

and

reverse
brake

after

being
introduced
into

the
circuit

12

through
Ihe

1st
2nd
shift

valve

ID
and

the

line

pressure
I

acts
on
C

A

T076

Fig
AT

43
Power

transmission

during
1
J

range

Fai1

A

TOn

Fig
AT
44

Operation

of
each
mechanism

during
JJ
range

Clutch
Low

Band
servo
On

Parking
Gm

Range
reverse
w

pawl
ratIO

Front
Rur

brake
Operatlon
Release

clulCh

Park

on

on

Reverse
2
182
on
on

on

Neutral

01
low

2
458
on

on

Drive
02
Second

1
458
on
on

03

Top
1000
on
on
on

on

2
Second

1
458
on

on

2
Second

IAS8
on

on

I

1
low
2
458
on
on

the

rear
clutch
and

governor
The

line

pressure
4

acts
in

the
same
manner

as

in
2

range

Similar
to

that
of
the

D

range

the
line

pressure

inr
reases
with
the

degree
of
accelerator

pedal

depression

and
the
line

pressure
decreases
with

the

increase
of
car

speed
The

governor
pressure
15
which
acts

on
the

I

st
2nd
shift
valve
does
not
increase

until
it

overcomes
the

combined
force

of
the
line

pressure
12
and
the

spring

causing
no
st
2nd

speed

cha

nge

AT
30

Automatic
Transmission

1

range
Low

gear

14
Down
ift

llll
Oid

VK

@50
I

10
Th
o
D
IttV

v

il

Dr
in

14

I

Front

Lubrlc
t
Oritlc

O
mV
I

i
ChKk

V

Th

on
P

Modif
t

0
11
1
IS

V

g
M
nu

V

l

PR

NOI
M
keel
X
Ir
0
11
1

1
1

P
IOov
nOt
tMod
P

O
no

p

Torqul
con

pr

Tn
ont

pr

AT
31
1M
2nd
hlf

23

6
J

s
ond

O
V
i

I

I
V

Oov
1
Of
v

Fig
A
T
45
Oil

pressure
circuit

diagram
II
II

range
Low

gear

Automatic

Transmission

1
ran

2nd
ar

L
l
l

ak

v
u

Co
nro

0
O
h

So
OId

ou

Coo

r

L

UIIoft
fi
v

Th

o

V
we
IhV

O
ein

iv

Lubo
lcat

OtHIc

CO

v
0
v

1

0
V
joy
Tlwont

Q
in

v
MOdIf

h1

ll

v

iJl

N

8I1l

0
1

lli

Onct
Y

a

nor
v
0
V
L1

p
10011
0
f
d

P

a
no

Torq
conv

Th
on

pt

Fig
A
T
46
Oil

pr
ure
circuit

diagram
1

z

range
2nd

gear

AT
J2

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

Automatic
Transmission

TRANSMISSION
CONTROL
LINKAGE

4

120N

L
B

j

p

r

4

1
Control
lever
knob

2
Pusher

3
Control
lever

assembly

4
Selector
range
lever

5
Control
lever
bracket

6
Selector
rod

REMOVAL
AND

INSTALLATION

1
Disconnect
control
knob
from

control
lever

by
removing
two
2

screws

2
Remove
console
box

3
Remove

selector
rod
selector

range
lever
and
control
lever

assembly

with
bracket

To
install
reverse
the
order
of

removal

ADJUSTMENT

The

adjustment
of

linkage
is
as
Tightening
torque
1
of

nuts
and

screw

kg
m
ft
lb
G

A

T273

@
T
0
07

to
0
13

0
5
to

0
9

@
T
1
6
to
2
2

12
to

16

T

3
to
4
22

to
29

@
T

0
35

to
0
45
2
5
to
3

3

C8i
T

0
8
to

1
1
6
to
8

important
as

Inspection
of
oil
level

for
the
automatic
transmission

Therefore

great
care
should
be

exercised
because

faulty
adjustment

will
result
in
the
breakdown
of
the

transmission

1

Prior
to

installing
control
knob

set
the
dimension
A
to
II
to
12
mm

0
43

to
0
47
in

2
Install
control
knob
on
lever
At

the
same
time
check
the
dimension

B
and

adjust
it
to
0
1
to
1
1

mm

0
004
to
0
043
in

by
turning
pusher

@
See

Figure
AT
51

AT

35
Fig
AT
51

Controlli
f
kage
sy
tem

3
Loosen

adjust
nuts

@
Set

control
lever

@
and
selector
lever

@

at
N

position
moreover

J
set
the

clearance
C

to
I
mm
0
039
in

by

turning
in
or
out

adjusting
nuts
at

trunnion
with
connects
selector
rod

@

After

adjusting
make
sure
that

control
lever
can
be
set
in

any
position

correctly
and
that
selector
lever

oper

ates

properly
without

any
binding

If

levers
do
not

operate
satisfactori

ly

readjust
or

replace
parts
as
neces

sary

Automatic

Transmission

MAJOR

REPAIR

OPERATION

SERVICE
NOTICE
FOR

DISASSEMBLY

AND

ASSEMBLY

TORQUE
CONVERTER

INSPECTION

TRANSMISSION

DISASSEMBL
Y

INSPECTION

ASSEMBL
Y

SERVICE
NOTICE

FOR
DISASSEMBLY

AND
ASSEMBLY

I
It

is
advisable

that

repair
opera

tions
be

carried
out
in
a

dust

proof

room

2
Due

to
the
differences
of
the

engine
capacities
the

specifications
of

component

parts
for

each
model
s

transmission

may
be
different

They

do
however
have

common

adjust

ment

and

repair

procedures
as
well
as

cleaning
and

inspection

procedures

outlined
hereinafter

3

During
repair
operations
refer
to

Service
Data

and

Specifications
see

tion
for

the
correct

parts
for
each

model

4

Before

removing
any
of

subas

semblies

thoroughly
clean
the
outside

of
the

transmission
to

prevent
dirt

from

entering
the
mechanical

parts

5

Do
not
use
a
waste

rag
Use
a

nylon
or

paper
cloth

6
After

disassembling
wash
all
dis

assembled

parts
and
examine
them
to

see
if
there
are

any
worn

damaged
or

defective

parts
and
how

they
are

affected
Refer
to

Service
Data
for

the

extent
of

damage
that

justifies

replacement

7

As
a
rule

packings
seals
and

similar

parts
once
disassembled
should

be

replaced
with
new
ones

TORQUE

CONVERTER

The

torque
converter
is

a
welded

construction
and

can
not
be
disas

sembled
CONTENTS

AT

36

AT

36

AT

36

AT

36

AT

36

AT
38

AT

38
COMPONENT
PARTS

FRONT

CLUTCH

REAR

CLUTCH

LOW
REVERSE
BRAKE

SERVO

PISTON

GOVERNOR

OIL

PUMP

PLANETARY

CARRIER

CONTROL

VALVE
AT

40

AT
40

AT
41

AT
42

AT
42

AT
43

AT
43

AT
44

AT

44

INSPECTION
2

Remove
bolts

securing
converter

1

Check

torque
convertf

for

any
housing
to
transmission

case
Remove

sign
of

damage

bending
oil
leak

or
torque
converter

deformation

If

necessary
replace
3
Remove

speedometer
pinion

2

Remove
rust
from

pilots
and
sleeve

bolt
Withdraw

pinion

bosses

completely
4

Remove
downshift
solenoid
and

If

torque
converter
oil
is

fouled

or
vacuum

diaphragm
Do

not
leave
dia

contaminated
due
to
burnt
clutch

phragm
rod
at
this

stage
of
disas

flush
the

torque
converter
as
follows
sembly
Rod
is

assembled
in

top
of

vacuum

diaphragm
See

Figure

I
Drain
oil
in

torque
converter

AT

53

2
Pour

non
lead

gasoline
or

kero

sene
into

torque
converter

approxi

mately
0
5
liter

I
U
S

pt
U

Imp

pt

3

Blow
air

into

torque
converter

and

flush
and
drain

out

gasoline

4
Fill

torque
converter
with

torque
converter
oil

approximately

0
5
liter
I

V
S

pt
U

Imp
pt

5

Again
blow
air
into

torque
con

verter
and
drain

torque
converter
oil

TRANSMISSION

DISASSEMBLY

I

Drain
oil
from
the

end
of
rear

extension

Mount
transmission
on

Transmission
Case

Stand
ST07870000

or
ST07860000
Remove

oil

pan
See

Figure
AT
52

AT118

Fig
AT

52

Removing
oil

pan

AT

36
Fig
AT
53
Down

hilt
olenoid
and

vacuum

dilJphragm

5

Remove

bolts
which

hold
valve

body
to
transmission

case
See

Figure

AT
54

Fig
AT
54

Removing
valve

body

6
Loosen
lock
nut

@
on

piston

stem

D
as
shown
in

Figure
AT

55

Then

tighten

piston
stem
in

order
to

prevent
front
clutch

drum
from

falling

when
oil

pump
is
withdrawn