1977 DATSUN PICK-UP oil pressure

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

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

i

r

11

I

@
@
j

A

T290

Assembly

I
Prior
to
assembly
dip
all

parts
in

clean
automatic
transmission
fluid

Reverse
disassembly
procedure
to

assemble
brake

2
Use
extreme
care
to
avoid
dam

aging
rubber

ring
when

installing
seal

lace

3

Blow

compressed
air

from

apply

side
of

piston
to
test

for
definite

piston
operation
as
shown
in

Figure

AT
93

7
i
8

ror
1

1
r

c

f

f
A

J

II
1

0

c
r

1

1
I

@

L
O
j

0
n

iJ

fl
IV
I

AT160

Fig
AT
93

Testing
piston

Apply
side

4
With

apply
side
of

piston
plugged

with
thumb
blow

compressed
air
into

cylinder
from
release
side
as
shown
in

Figure
AT
94
If
retainer

is
raised
a

little
it
is

an
indication
that

attaching

bolts
are
loose

calling
for

retightening
1
Anchor
end

pin

2
Band

strut

3

Apply

4
Release

5
Return

spring

6
Band
servo

piston
stem

7

Band
servo

piston

8
Servo
retainer

9
Brake
band
assembly

10

Transmission
case

Fig
AT
92
Sectional
view

ofseruo
piston

7
o

i
J

1S

I

z
1
Y

i
1

t
9
c
fa

AT161

Fig
AT
94

Testing
piston

Release
side

GOVERNOR

Disassembly

I

Separate
governor
from
oil
dis

tributor

by

unscrewing
attaching
bolts

2
To
disassemble

secondary

gover

nor

remove

spring
seat

spring
and

secondary
governor
valve
from
valve

body
in
that
order

as
shown
in

Figure

AT

95

To
control

val

i
1

3

5MI
n

ID
r

Ii

I

4

From
control
valve

Line

pre
sure

I

I
A
TOgO

4
Oil

distributor

5

Output
shaft
I

Primary
governor

2

Secondary
governor

3
Governor
valve

body

Fig
AT
95

Testing
secondary

govemor

AT
43
3

If

primary
governor
is
to
be

dis

assembled
for

any
purpose
remove

spring
seat

primary
governor
valve

spring
and

spring
seat

Inspection

I
Check
valve
for

faulty
condition

Replace
spring
if
found
weakened

beyond
use
Faulty

piston
should
also

be

replaced
with
a
new
one

2
Examine
to
see
if

primary
gover

nor
slides

freely
without

binding

3
To
determine
if

secondary
gaver

nor
is
in

good
condition
blow
air

under

light

pressure
into
hole
at
A

and
listen
for
noise
like
that
of
a

model

plane

Assembly

Reverse
disassembly

procedure
to

assemble

governor

Note
Do

not
confuse

primary
gover

nor
with

secondary
governor
After

installation
check
that

spring
is
not

deflected

OIL
PUMP

Disassembly

I
Free

pump
cover
from

pump

housing
by
removing
attaching
bolts

2
Take

out
inner
and
outer

gears

from

pump
housing

Inspection

I

Inspect
for
wear
or

damage
to

gear
teeth

Replace
rubber

ring
if

found

damaged
beyond
use

2

Using
a

straight
edge
and
feelers

measure

pump
and

gear
clearances
as

follows

Clearance
between
inner

or
outer

gear
and

pump
cover
See

Figure

AT
96

Standard
clearance

0
02
to
0
04

mm

0
0008100
0016
in

Replace
if
over
0
08
mm
0
00
11

in

I

F
1

D

t
l

a

J
n
f

19l1
Ull

IU
P

C
o
J

CJ
IODrR

CC

t

LL6
SJQIl2J

lhl

fB

rt

AT169

Fig
AT
102

Removing
separate

pllJte

3
Pull

out
manual
valve

as
shown
in

Figure
Ar103

4

Remove
side

plate
Take

out

1st
2nd
shift
valve
2nd

3rd
shift

valve

pressure
modifier

valve
and

three

valve

springs
See

Figure
AT

104
Automatic
Transmission

Fig
AT
103

Removing
manual
val

AT1
1

HT61000800

Fig
AT
104

Removing
side

plate

g

p

e

eguJa

Of
le6Ve
or

r
essure
reguJl

oL

@iO
I
f

g

SecOni
J

lOCltvalYi
y

h

l
l

2I
r

JI
Io
J
l

j

t

1

i

S

r
0

x

t

i

3
1
Note
Do
not
w
it

off
with
screw

drivers
To

avoid

darnagingmachine

screws
do

not
work
it
ff
with

screwdriver

5

Remove
side

plate

pull
out

pres

sure

regulator
valve
second
lock

valve

pressure

regi1lator
plug
and
two

valve

springs

6

Remove
side

plate
With

side

plate
removed
solenoid
downshift

valve
throttle
back

up
valve

vacuum

throttle
valve
2

d
3rd
t

ing
valve

and
three
valve

springs
are
free
for

removal

2nd
3rd

timing
talve

r

en

i
C1iJrilth

rottle
lI

lY
e

M
a

alVSY
I

j1

f

I
1

f
Iv

I

f
2i
3

CP

g

f
st

2nd
S
t
a

el

2i1d

3
d
St1itLvalv

so

iit
a

stiift

V81v
i

hrottle

f

iicnjp
VB
y
i

P

ie
mo

i

Inspection

r

I

Check
valves
for

sign
of

burning

and
if

necessary
replace

2
Check
to

be
certain
that

oil

strainer
is
in

good
condition

If
found

damaged
in

any
manner
disCard

3

Test
valve

springs
for

weakened
Fig
AT

105

Components
ports
of
control
uolue

tension

if

necessary
replace

4

Examine

for

any

sign

oLdamage

or

score
marks
on

separate

plate
If

left
unheedcd

oiL
will

bypass
correct

oil

passages
causing
many
types
of

abnormalities

in

thesystem

AT45
5
Check
oil

passages
in

valve
b

dy

for

sign
of

damage
and
other
condi

tions
which

might
interfere
with

prop

er
valve

operation

6
Check
bolts
for

stripped
threads

Replace
as

required

Automatic
Transmission

Valve

spring
chart

Mean
coil
Installed

Valve

spring
Wiredia

dia
No
of

free

length

mm
in

mm

in
active
coil

mm
in

Length
Load

mm
in

kg
lb

Manual

detent
1
3
6
0
15

0

32
4

26
5

5
5

0
051

0
236
1
276
1
043

12
1

Pressure

regulator
1
2
10
5
13

0
43

0
23
5
2

8

0
047
0
413

1

693
0
925
6

2

Pressure
modifier
0
4

8
0

5
0

18
5

9
0
0
1

0

016
0
315

0
728

0
354
0
2

1st
2nd
shift
0
6
6
0

6
0
32
0
16

0
0
625

0

024
0

236
1
260
0

630
1
378

2nd

3rd
shifl
0
7
6

2
8
0
41

0
17
0

1
40

0
028
0
244

1

614

0
669
3

09

2nd
3rd

timing
0
7
5
5
15

0

32
5
27
0
0
55

0
028

0
217

1
280
1
063
1
21

Throule
back

lIP
0
8

6
5

14

0
36
0
18
8
1

92

0
031

0
256

1417
0
740
4
23

Solenoid
downshift
0
55

5
0
12

0
22
0

12
5
0

60

0
0217
0

197

0
866
0
492

1
32

Second
lock
0
55

5
0
16
0

33
5
21
0
0
60

0

0217
0

197

1
319
0
827

1
32

Throule

relief
0

9
5

6
14
0

26
8
19
0

2
9

0
035
0

220

1
055
0
748
4
83

Orifice
check
0
23
4

77
12
0

J5
5
11
5

0
01

0
0091
0
1878

0
610
0
453

0
02

Primary
governor
0
45
8
3
5
0

21
8
7
5
0

215

0
0177
0
327

0
858
0
295
0
474

Secondary

governor
0
7
8
5

5
5
25
1
10
5

I
10

0

028
0
335
0
988
0
413

2
43

Free

lenglhm
A
installed

f

n
ri

DO
n
i

Wire
dia

AT172
Assembly

Assemble
in

reverse
order
of
disas

sembly
However

observe
the
follow

ing
assembly
noles
Refer
to

Valve

Spring
Chart

and
illustralion
in

as

sembling
valve

springs

Dip
all

parts
in

clean
automatic

transmission
fluid

before

assembly

Tighten
parts
to

spec
ifications
when

designated

I
Slide

valve
into
valve

body
arid

be

particularly
careful
that

they
are
not

forced
in

any
way

2

Install
side

plates
using
Torque

Driver

ST25160000
and

Hexagon

Wrench
HT6
I

000800
See

Figure

AT
l
07
Fig
AT
106

Value

spring

AT
46

Automatic
Transmission

TROUBLE

DIAGNOSIS
AND
ADJUSTMENT

INSPECTION
AND
ADJUSTMENT

BEFORE

TRQUBLE
DIAGNOSIS

TESTING

INSTRUMENT
FOR

INSPECTION

CHECKING
OIL

LEVEL

INSPECTION
AND
REPAIR
OF

OIL
EAKAGE

CHECKING

ENGINE
IDLING

REVOLUTION

CHECKING
AND
ADJUSTING

KICKDOWN

SWITCH
AND

DqWNSHIFT
SOLENOID

N
J
J
CII
Q

t
L
8li
p

JYSTMs
T
OF

MANUAL
LINKAGE

CHECKING
AND

ADJUSTING

INHIBITOR

SWITCH

STALL
TEST

STALL
TEST

PROCEDURES

JUDGEMENT

Since
most
automatic

transmission

troubles

can
be

repaired

by
simple

adjustment
do
not
disassemble
im

mediately

Firstly

inspect
and

adjust
the
auto

matic
transmission

in

place
utilizing

the
Trouble

Shooting
Chart

If
the
trouble
can

not
be
solved

by

this

procedure
remove
and
disas

semble

the
automatic
transmission

It

is

advisable
to
check

overhaul
and

repair
each

part
in
the

order
listed
in

the
Trouble

Shooting
Chart

I
In
the
Trouble

Shooting
Chart

the

diagnosis
items

are

arranged
ac

cording
to

difficulty
from

easy
to

difficult
therefore

please
follow
these

items
The
transmission
should
not

be

removed
unless

necessary

2
Tests
and

adjustments
should
be

made
on
the
basis
of
standard
values

and

the
data

should
be
recorded

INSPECTION

AND

ADJUSTMENT

BEFORE

TROUBLE
DIAGNOSIS

TESTING
INSTRUMENT
FOR

INSPECTION

I

Engine
tachometer

2
Vacuum

gauge
ROAD
TEST

VEHICLE
SPEED

AT
GEAR

SHIFT

CHECKING
SPEED
CHANGING

CONDITION

CHECKING
ITEMS
DURING
SPEED

CHANGE

SHIFT
SCHEDULE

LINE

PRESSURE
TEST

LINE

PRESSURE

governor
feed

pressure

JUDGEMENT
IN

MEASURING
LINE

PRESSURE

At
49

TR6
uBLE
SHOOTINC
CHART

INSPECTING
ITEMS

TROUBLE

SHOOTING
CHART
FOR

3N71B

AUTOMATIC
TRANSMISSION

TROUBLE

SHOOTING
GUIDE
FOR

3N71B

AUTOMATIC
TRANSMISSION
CONTENTS

AT
4B

AT
48

AT
4B

AT

49

AT
49

AT
49

AT
49

AT
50

AT

50

AT
50

3
Oil

pressure
gauge

It
is
convenient

to
install
these

instruments
in
a

way
that
allows
meas

urements
to
be
made
from
the
driver
s

seat

CHECKING
OIL
LEVEL

In

checking
the
automatic
transmis

sion

the
o
illevel
and
the
condition
of

oil
around
the
oil
level

gauge
should
be

examined
This
is

an

easy
and
effective

trouble

shooting

procedure
since

some

changes
in
oil
condition

are
often

linked
with

developed
troubles

For
instance

Lack
of
oil
causes

faulty
operation

by
making
the
clutches
and

brakes

slip
resulting
in

severe
wear

This
is
because
the
oil

pump
sucks

air

causing
oil

foaming
thus

rapidly

deteriorating
the
oil

quality
and

pro

ducing
sludge
and

varnish

Excessive
oil
is

also
bad
because
of

oil

foaming
caused

by
the

gears

stirring

up
the
oil

During
high
speed

driving

excessive

oil
in

the

transmission
often

blows
out

from
the
breather

Measuring
011
level

To
check
the
fluid
level
start
the

engine
and
run
it
until
normal

operat

T
AO
AT
51

AT
51

AT

52

AT
52

AT
52

AT

52

AT

53

AT
3

AT

53

AT

53

AT

54

AT
57

ing
temperatures
o

temperature
SO

to
800C

122
to
l760F

Approxi

mately
ten

minute
of

operation
will

raise
the

temperature
to
this

range

and

engine

idling
conditions

are
stabi

lized
Then

apply
the
brakes
and

move
the

transmission
shift
lever

through
all
drive

positions
and

place
it

in

park
P

position
In

this

inspec

tion
the
car
must
be

placed
on
a
level

surface

The
amount
of
the
oil
varies

with

the

temperature
As
a
rule
the
oil
level

must
be
measured
after
its

temper

ture
becomes

sufficiently
high

1

Fill
the
oil
to

the
line
H
The

difference
of

capacities
between
both

H
and
L
is

approximately
0
4

liter
Ji
V
S

p
Y

Imp
pl
and

therefore
do

not
to
fill

beyond
the

line

H

2
When

topping
up
and

changing

oil
care
should
be
taken
to

prevent

mixing
the
oil
with
dust
and
water

InspectIng
011

condition

The
condition
of

oil

sticking
to
the

level

gauge
indicates
whether
to
over

haul
and

repair
the
transmission

or

look
for
the

faulty

part

If
the
oil
has
deteriorated
to
a

varnish
ike

quality
it

causes
the

con

trol
valve
to
stick
Blackened
oil
indi

cates
a
burned
clutch
brake
band
etc