1977 DATSUN PICK-UP Service Manual

Automatic

Transmission

0

range
Top
gear

Low
A

lI
eke

B
e

I

mf
D

J

J

V
va
I

011
COO
VK

Thro

V

o

Ot
al

oi

v

L
R
Lubfkatlon

y

Front

Lubric

1
n

Oriliu

Check

1

1
O
nV

Th
onla

O

eln

Vah
2
P
M
lflM
V

I

5

22

x

i2J

3
1n
2nd

Shift
v

1Ye

5

Manue

Val

PRND2
j
Pr

R
I
Of
1

1

5

Nota
Marked
r

Dr
ln

rs

ond

y
l

y

G
nor

Val
Goy
rnor
Val
1

1

IOo
no

feold
P

Oo
no

p

Torq
c

on
n

p

Th
onl
pr

Fig
A
T
38
Oil

pressure
circuit

diagram
uD

J
range

Top
gear

AT

25

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

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

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