1977 DATSUN PICK-UP clutch

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

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

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

AT121

Fig
A
T
55
Loosenin
band
seruo

7
Pull
out

input
shaft

8
Withdraw
oil

pump
using
Sliding

Hammer
ST25850000
Do
not
allow

front
clutch
to
come
out
of

position

and

drop
onto
floor
See
Figure

AT
56

AT122

Fig
AT
56

Removing
oil

pump

9

Remove
band
strut
This
can
be

done

by
loosening
piston
stem
further

See

Figure
AT
57

Fig
AT

57
R

moving
band
strut

10
Remove
brake
band
front

clutch
and
rear
clutch
as
an
assembled

unit

11
Remove

connecting
shell

rear

clutch
hub
and
front

planetary
carrier

as
a
unit
See

Figure
AT
58
Automatic
Transmission

Ii

AT124

Fig
AT
58
R
mouin
connectin
shell

12
With

the
aid
of

Snap
Ring
Re

mover
HT69860000

pry
snap
ring
off

output
shaft

See

Figure
AT
59

Fig
AT
59
Remouing
sruzp
ring

13
Remove
connecting
drum
and

inner

gear
of

rear

planetary
carrier
as

an

assembly
See
Figure
AT
60

AT126

Fig
AT
60
Remouing
connecting

drum

14
Remove

snap
rings
and
then

remove
rear

planetary
carrier
internal

gear
connecting
drum
one

way
clutch

outer
race
and
one

way
clutch
in
that

oroer

15
Remove
rear
extension
by

loosening
securing
bolts
See

Figure

AT
61

AT
37
AT127

Fig
AT
61
Remouin
rear
extension

16
Pull
out

output
shaft
remove
oil

distributor

CV

together
with

governor

valve

CD
See

Figure
AT
62

Fig
AT

62

Remouinggouernorand

oil
distributor

17
Pry
off

snap
ring
using
a
pair
of

pliers
Remove

retaining
plate
drive

plate
driven

plate
and
dish

plate
in

that
order
See

Figure
AT
63

Fig
AT
63
Remouing
driue
and

driuen

plates

18
Reaching

through
back
side
of

transmission
case
remove
hex
head

slotted
bolts
as
shown
in

Figure

AT
64
To
do
this
use
Hex
head

Extension
ST25570001

ST25570000
One
way
clutch
inner

race
thrust
washer

piston
return

spring
and
thrUst

spring
ring
can
now

be
removed

I
i
0

t
V

iL

1

0

ST25570001

j

w
1
h

AT130

Fig
AT
64

Removing
hex
head
slotted

bolt

19
Blowout
low
and
reverse
brake

piston
by
directing
a

jet
of
air
into

holeJn
cylinder
See
F

igure
AT
65

Fig
AT
65

Removing
piston

20
Remove
band
servo

loosening

attaching
bolts

Note
If

difficulty
is
encountered
in

removing
retainer
direct
a

jet
of
air

toward
release
side

as
shown
in

Figure
AT
66

II

AP

fW
l

1

A
T132

Fig
AT
fiB

Removing
bond
servo

21

Pry
snap

rings
CD
from
both

ends
of

parking
brake
lever

@
and

remove
the
lever

Back
off
manual

shaft

lock
nut

ID
and
remove

manual

plale
@
and

parking
rod

CID
See

Figure
AT
67
Automatic
Transmission

Up

@
J1i

ll
J

t
i
p

lli
l
1

I
l
P
l

1
Ii

@

j
Y

L

l

rr
i

J

ry

j

AT133

Fig
AT
67

Removing
manual

plate

22
Remove
inhibitor
switch
and

manual
shaft

by

loosening
two
secur

ing
bolts

INSPECTION

Torque
c
onverter
housing

transmission
c
ase
and

rear
extension

I

Check
for

damage
or
cracking
if

necessary
replace

2

Check
for
dents
or
score
marks

on

mating
surfaces

Repair
as
nee

essary

3
If
rear
extension
bushing
is
worn

or
cracked
replace
it

as
an
assembly
of

bushing
and
rear
extension
housing

Gaskets
and
O

ring

1

Always
use
new

gaskets
when
the

units
are
to
be
disassembled

2
Check
O

rings
for
burrs
or
crack

ing
If

necessary
replace
with

new

rings

011
distributor

I
Check
for

signs
of
wear
on
seal

ring
and

ring
groove
replacing
with

new
ones
if
found
worn

beyond
use

Check
that
clearance
between
seal

ring
and

ring
groove
is
correct
If
out

of

specification
replace
whichever
is

worn

beyond
limits
Correct
clearance

is
from
0
04
to
0
16
mm
0
0016
to

0
0063
in
See

Figure
AT
68

AT
J8
j
Clearance

1

61
Seal

dng

0

j

J

I

I

AT134

ig
A
r
68
Me

q
sur

ingseal
r

ing
to

ring
groove
clearance

ASSEMBLY

Assembly
is
in

reverse
order
of

disassembly
However
observe
the
fol

lowing
assembly
notes

After

installing
piston
of
low
and

reverse
orake
assemble
thrust

spring

ring
return

spring
thrust
washer
and

one

way
clutch
inner
race

Torque

hex
head
slotted
bolt
to
L3to
1
8

kg
m

9
to
13
ft
ib

using
Hex
head
Ex

tension
ST2SS7000
ST2SS70000

Torque
Wrench
GG93010000
and

Socket
Extension
ST2S490000

ST2SS
12001
See
Figure
AT
69

ST2557000t

ST25490000

I

GG930JOOOO

A
T135

Fig
AT
69

Installing
ont

woy
clutch

inner
race

2
After
low
and
reverse
brake
has

been
assembled
measure
the
clearance

between

snap
ring
CD
and

retaining

plate
@
Select

proper
thickness
of

retaining
plate
to

give
correct

ring
to

plate
clearance
See

Figure
AT
70

Low

and
reverse
brake

clearance

0
80
to
1

05
rom

0
0315
to
0
0413
in

Fig
AT
70

Measuring
ring
to

plate

clearance

Available

retaining
plate

Thickness
mm
in

1l
8
0
465

12
0

0472

12
2
0480

124

0488

12

6
0496

12

8
0
504

For

inspection
procedure
for

low

and

reverse
brake
see

page
AT
42
for

Assembly

3

Install
one

way
clutch
so
that
the

arrow
mark
is
toward
front

of

vehicle
It
should
be

free
to

rotate

only
in

clockwise
direction
See
Figure

AT
71

mITIJ

o

oml

AT137

Fig
AT
71

One

way
clutch

4
After

installing
rear
extension

torque
attaching
bolts
to
2
0
to
2
5

kg
m

14
to
18
ft
lb
Place
manual

lever
in
P

range
and
check
to

be
sure

that
rear

output
shaft
is

securely

blocked

5

Tighten
servo
retainer

temporari

ly
at
this

stage
of

assembly

6
Place

rear
clutch

assembly
with

needle

bearing
on
front
assembly
Automatic
Transmission

7

Install
rear
clutch
hub
and
front

planetary
carrier
as
shown
in

Figure

AT
72

AT142

Fig
AT
72

Installing
planetary
carrier

8
Assemble

connecting
shell
and

other

parts
up
to
front
Clutch
in

reverse
order
of

disassembly

AT143

Fig
AT
73
Installing
connecting
shell

9

Adjust
total
end

play
and

front

end

playas
follows

Front
end

play

L

r

L

CD
I

r

L

11
I
J

Total
end

play
@

Front
clutch

thrust
washer

2

Oil

pump
cover

3
Front
clutch

4

Rear
clutch
AT138

5

Trammission
case

6
Oil
pump

gasket

7
Oil

pump
cover

bearing
race

Fig
AT
74
End

play

1
Measure
the
distance
A

and

C

by
vernier

calipers
as
shown

in

Figure
AT
75

AT
39
i
Rear

c

clutch

N
edle
bearing

Bearing
race

I

Fig
AT
75
AT139

Measuring
the
distance

A

and
C

2

Measure
the
distance
B

and

D
of

oil

pump
cover
as
shown
in

Figure
AT
76

I

L

I
Oiipi
mp

AT140

Fig
AT
76

Measuring
the
distance

B
and
D

Adjustment
of

total
end

play

Select
oil

pump
cover

bearing
race

by

calculating
the

following
formula

TT
A
B
W

where

T

T
Required
thickness
of
oil

pump

cover

bearing
race
mm
in

A

Measured
distance
A
mm
in

B
Measured
distance
B
mm

in

W
Thickness
of

bearing
race

temporarily
inserted
mm
in

Available
oil

pump
cover

bearing

race

Thickness
mm

in

1
2
0
047

I
4
0
055

1
6
0
063

1
8
0
071

2

0
0
079

2
2
0
087

Specified
total
end

play

0
25100
50
mm

0
0098
to
0
0197
in