1977 DATSUN PICK-UP automatic transmission

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

0
ran
e

2nd
ear

I

I

l
I

7
Throttle

k

up
ftV

V

II

I

ont

Lubtlclt
n
Orifice

C
Kk

Val
C

alnV
I

Th
ottle

O
n

Valve
2
S
Mod
V
l

IS

13

CD

Regulator
V
@2rlCl
3
dShlft

V

13

F

311ft
2nd

Shift
V
l

S

Manual

V

PR

Nota
M
X
r
Dr

1
n

I
i

O
nof
Vaw
LI
p
IGov
nor
fINd

P

Gov
norp
r

c
J

TORI
0
0
pr

Iiiiiiiiiiiiiii
Thronle

pr
ieconoery

Gov
nor
V

Fig
A

T
35
Oil

pressure
circuit
diagram
D

z
range
2nd

gear

AT

23

D
RANGE
TOP
GEAR
Automatic
Transmission

In
3rd

gear
position
the
front
and

rear
dUlches
are

engaged
The

power

now
takes

place
through
the

input

shaft
into
rear

clutch
drum
The
rear

clutch
drum
rotates
the

steel
drive

plates
of
the

rear
clutch
and
the
lined

drive

plates
of
the
rear
clutch
and
the

lined

drive

plates
of
the

front
clutch

The
rear
clutch
directs
the

power
flow

through
the

rear
clutch
hub
and

front

internal

gear
to
the
front

pl
net

carrier

The
front
clutch
directs
Ihe

power

now

through
the

connecting
shell
to

the
sun

gear
Wilh
the
sun

gear
and
the

rear
clutch
hub

driven
at
the
same

speed
the
front

planet
assembly
is

forced

to
rotate
the

output
shaft
at

the

same

speed
in

the
direction
to

provide
the

top
gear

When
the

car
speed
further
in

creases
while

running
at

D2
range

2nd

gear
and

the

governor

pressure

15
exceeds
the
combined
force
of

the

spring
of
the
2nd
3rd
shift
valve

@
and
the

throttle

pressure
19
the

2nd
3rd
shift
valve
@
moves
and

the
line

pressure
8
acts
to
release
the

front
clutch
and
band
servo

through

the
line

pressure
10
OJ

a

Fig
AT
36
Power
transmission

during
DJ

range

A
T083

Fig
AT
3

Operation
of
aeh
mf
hani5m
UDJ

range

Clulch
Low

Band
KrVO
One

Parking

em

Ral
8t
reverK
w

pawl

ratio

Front
Rear

brake
Operation
Rdene

clutch

Park
on
on

Reverse
2
182
on
on
on

Neutral

01
Low
24S8
on
on

Drive
02
Second
1
4S8
on
on

03
Top
1
000
on
on
on
on

1
Second

t
4S8
on
on

12
Second
1
458
on
on

t

I

Lo
2
458
on
on

AT
24

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