1977 DATSUN PICK-UP oil pressure

Automatic
Transmission

P

range
Park

Front

Cluteh
1
1

Brllk

ar

Bond

Torqu
Con

u

o

ID
VK

Th
o

I

V
II
IftY

all
Coo

II

I

Front

Lubrk
It
n

Orltlc

Check

V
A

L
b
k

tlon

1

e

O
ln

I

ThrOttle

D
ln

V

21

j
r

tUI
lor
V
h

@

V
hI

N01
M
rked
X
r
D
ln
5

I

I

I
X

Line
pr

Go
nor
t
d
pr

L
J

Q
RO
p

c
J

Torq
co
p
f

Th
ottl

p
Iecond
y

Ocw
no
V

Gover
V

Fig
A
T
25
Oil

pressure
circuit

diagram
P

range
Park

AT

IS

Automatic
Transmission

R
RANGE
REVERSE

R

In
R

range
the

front
dutch
and

the
low
and

reverse
brake
are

applied

The

power
flow
is

through
the

input

shaft
front
clutch
and

connecting

shell
to

the
sun

gear
Clockwise
rota

tion

of
the

sun

gear
causes
counter

clockwise
rotation
of
the
rear

planeta

ry

gears
With
the

connecting
drum

held

Slationary
by
the
low
and
reverse

brake
the
rear

planetary
gears
rotate

the
rear
internal

gear
and
drive
the

flange
counterclockwise
The
rear

drive

flange
splined
to
the

output
shaft

rotates
the

output
shaft
counterclock

wise
at

a
reduced

speed
with
an

increase
in

torque
for
reverse

gear

f

When
Ihe
manual
valve

CV
is

posi

tioned
at
R

range
Ihe
oil

having
Ihe

line

pressure
7
is

directed
to

line

pressure
circuits
5
and

6
The

pressure
in

the
circuit
5
actuates
the

low
and
reverse
brake
after

being

introduced
into
line

pressure
circuit

12

through
the
I
st

2nd
shift
valve

@
The

pressure
in
Ihe

circuit

op

erates
the
release
side
of
the
band

servo
and

the
front
clutch
after

being

led
to

line

pressure
circuit

10

through
the
2nd
3rd
shift
valve

@

The
throtlle

pressure
16
and
the
line

pressure
6

which

vary
with
the

degree
of
acceJerator

pedal
depression

both
act

on
the

prcssure
regulator

valve

CD
and

press

against
its
valve

CD

increasing
line

pressure
7
In
R

range
the

governor

pressure
is
absent

making
all
slldl

valves
as
the
J
SI

2nd

shift
valve

@
2nd
3rd
shift
valvc

@
and

pressure
modifier
valve

j

inoperative
C

Fig
AT

26
Power

transmi
ion

during
R

range

A
TOS5

Fig
AT
27

Operation
attach
mechanism

during
R

range

G
Clutch
Low
A

Band
servo
One

Parkin

Ran
no
wa

plwl
ratio

Front
Rear

brake

Operllioo
Rdr
ue

clutch

k
on
on

Revctte
1
181
on
on
on

Neutnl

DI
Low
1
418
on
on

Driw
D2
Second
1
458
on
on

DJ

Top
1
000
on
on
on
on

2
Second
1
458
on
on

12
Second
1
458
on
on

I

II
Low
2
458
on
on

AT
16

R

range
Reverse
Automatic
Transmission

TOl
QuaConverter

o

IIi
0

ou

14

Q

FI
Lu

IUt
O

Front

Lub
lc

O
lnV
ly

R
MO
V
l
Front

Clutdt
LowaoA

B
k

e
k

B

Clutch

ID
VK

n

V
lv
@
ftV
1

I

j

Throttle

O
in

V
Otlflce

Check

V
III

@lnd
3rdShih

V

zz

@
2nd
rd
TIm

If

V
Iy

Second
Lock
V

3
I

Zl

Not

M
k
d
X
er
0
1

LI
p
O
nOf
f

P

G
preau

I
J

Torqu
0
0
pr

Throttl

p
1
s
co

O
V
0

O
V

Fig
A
T
28

AT
17
Oil

pressure
circuit

diagram
n
II

range
Reverse

N
RANGE
NEUTRAL
Automatic
Transmission

In
N

range
none
of
the
clutches

and
band
are

applied
thus

no

power
is

transmitted
to
the

output
shaft

The

pressure
of

oil

discharged
from

the
oil

pump
is

regulated
by
the

pressure
regulator
valve

CD
to
maintain

the
line

pressure
7
and
the
oil
is
led

to
the
manual
valve

V
vacuum
throt

tle
valve

@
and
solenoid
down
shift

valve

@
The
oil
is

further
introduced

into
the

torque
converter
at
its

op

erating
pressure
14
and
a

portion
of

this
oil
is
distributed

to
each

part
as

the
front
lubricant
The
oil
which
has

been

discharged
from

the

torque
con

verter
is
also
distributed

to
eacn

part

as
the
rear
lubricant

As

the
oil

pump
rotates
at
the
same

speed
as
the

engine
the
oil

pump

discharge
increases
with

engine
speed

But
the

surplus
oil

is
returned
to
the

oil

pan
by
the

pressure
regulator
valve

CD
G
Clutch
Low

Band
servo
One

Pukiq

R
w

pawl
ntlo

Front
Rur

br
ke
Optruion
Release

clutch

PIlIi
on
on

Reverse
2
182
on
on
on

Neut
1

01
Low
2
458
on
on

Drive
02
Second
t
458
on
on

03

Top
1
000
on
on
on
on

2
Setond
1
458
on
on

12
Second
1
4
58
on
on

1

II
Low
2
458
on
on

AT

18

Automatic
Transmission

N

ranee
Neutral

I
a

a

8

nd

011
Coolei
VK

Th

o

Vtlv
J
@

Vtlv

I

I
D
ln

Ol
v
Lubrlc
tlon

11

I

OIIt

Lubrlut

O
lfIC

Check

Vtlv

D
lnV

I

T
uott

O
in

v

8Jl

12

ht
2nd
Shift
y
tve

5

CD

Rl9UlttO
Vtlv

Nott
M
rked
X
r
D
in

liia

1
or

IOo
nOf
fNd
IH

oov
no

p

c
z
Torqu
con
er

pr

Throttl
p
s
cond

y

a

Ol
V
o
V
tve

Fig
AT
29

AT
19
Oil

pressure
circuit
diagram
N

range
Neutral

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

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

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