DATSUN B110 1973 Service Owner's Manual

AUTOMATIC

TRANSMISSION

R

range
Reverse

o
fro

Clutch
R

Clutch
Low
0

R

8

B
e

Torque
Con

14

Q

T
CO
fI

I
9
ID
v

Th

Vel

r

j
Orei

1
Ve

Front

Lubdce

O
IfQ

Cheek

Vah
OJ

iJ

Thronle

D
ein

V
D
i
V

l

x

21

CDp

R
Iulato
Velv

@

Not

M
k
r
D
ein

Unep
n
IGover
o

t
t
praaur
1

G
l
Gov
r
o

pr

Torque
CO

rler

p

ThrOU

epr
s
cOnclMV

Gov
nOt
V
P

i
V

Gov
nor
Velv

Fie
A
T
28
Oil

pressure
circuit

diagram
R

range
RelJerse

AT
17

CHASSIS

rang
e

eutral

In
N

range
all

the
clutches
and

band
are

not

applied
therefore
no

power
is
triJllsmilted

10
the

output

shaft

The

pressure
of
oil

discharged
from

the
oil

pump
is

regulated

by
the

pressure
regulator
valve

D
to
maintain

the
line

pressure
7
and
the
oil

is
led

to
the

manual
valve

r
2
vacuum
throt

tle
valve

@
and
solenoid
downshift

valve

@
The
oil
is

further
introduced

into
the

torque
converter
at
its

operat

ing
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
converter

is
also

distributed
to
each

part
as
the

rear
lubricant

As
the

oil

pump
rotates
at
the

same

speed
as
thal
of
the

engine
the

dis

charge
of
oil

pump
increases
with
the

engine
speed
But

the

surplus
oil

is

returned
to
the

oil

pan
by
the

pressure

regulator
valve

D

I

l
nUI

h
lo
BJnd
oefVQ
On

Parkin
Gt
ar

Rang
e
rl
tro
e
lA

a

pawl
ratio

Front
RUT
brake
Operation
Rdu
e

clutch

Park
on
on

Revtr
21Rl
on
on
on

Neutral

01
Low
2
458
on
on

Orive
02
Second
1
458
on
on

OJ

Top
1000
on
on

ton
on

2
cond
1
58
on
on

12
Second
1
458
on
on

I

II
low
2
458
on
on

AT
iS

AUTOMATIC
TRANSMISSION

UN

range
Neutral

Low

R

Brek

B
eke

B

x

12

VK

Th
o
I

V
lv
7

G
0

j

Lve

Fro

Lub
lc
l

Otifite

Check

Valve
D

alnValve
j

11

I
3

ThrOUle

OrOlln

Vah
f
11

J

l

8
5018

Back
up
g

Dow
ill
V
lv

V
v

P
Modif

V
lve

15

13

8Jlux

3

j
p
ssu

A
euleto
Velye
6

lL

2
Menuel

V
lv

iiJIN
NOI
M
ked
O
in

Lin
pre
lGovernor
teed

pr
e

Gove
no

pr
s

Torquecon
e

p
e5SU

ThroW

p
S
Ond

y

G
o
V

8
Primary

Goy
no
V
l

Fig
A
T
29
Oil

pressure
circuit

diagram
N

range
Neutral

AT
19

CHASSIS

D

range
Low

gear

The

low

gear
in
D

range
is

somewhat
different
from
that
in

II

range

The
rear
clutch

is

applied
as
in

range
but
the
une

way
duldl
is

holding
the

connecling
drum
The

power
flow
is
the
same

as
in

11

range
That
is
the

power
flow
takes

place
through
Ihe

input
shaft

and
into

the
rear
clutch

The

input
shaft
is

splined
to
the

rear
clutch
drum
and

drives
it

Rotation
of
the

rear
clutch

dri
es

the
rear
clutch

hub
and

from

internal

gear

The
front
inlernal

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

gears
clockwise
With

the

Tear

plane

tary
carrier
held

stationary
by
the

one

way
clutch
the

clockwise
rotation

of
the

rear

planetary

gears
rotates
the

rear
internal

gear
and
drives

flange

clockwise

The
internal
drive

flange
is

splined
to
the

output
shaft

and
rotates

the

output
shaft
clockwise

When
the
manual
valve
is

posi

tioned
at
D
the
line

pressure
7

introduced
into
the
manual
valve
is
led

to
the
line

pressure
circuits
I
2

and
3

The

pressure
in
the
circuit
I

actuates
the

rear
clutch
and
the

gover

nor
and
at
the
same

time

operates
the

lst

2no
shift
valve

ID
to

change
the

speed
The
circuit
2
leads
to
the

second
lock
valve

@
The
circuit
3

actuales
the
2nd
3rd

shift
valve

0

for
the
2nd

3rd

speed
change
and

at
the

same
time

locks
the
second

lock
valve

@

The
throllIe

pressure
16

which

changes
with
the

degree
of
accelerator

pedal
depression
presses
the

pressure

regulator
valve

CD
and
increases
the

line

pressure
7
When

Ihe

speed
of

vehicle
has
increased
the

governor

pressure
J
5

inlroduced
from
the
line

pressure
circuit

ll
actuates

the

lst
2nd
shift

valve
ID
2nd
3rd

shift
valve

@
and

pressure
modifier

valve

@
When
the

governor
pressure

is

high
the

pressure
modifier
valve

CID

acts
in
such

a
direction
as
to

compress
C

AT080

Fig
A
T
30
Power
transmission

during
V
range

ATOP1
dmifi

Fig
AT

3
Operation

of
each
mechanism

during
VI

range

G
Clutch
Low

Band
rVo
One

Parking

Ro
reverse

woy

pawl
ratio

Front
Rear

brake
Operation
Release

clutch

Park
on

on

Reverse
2
182
on
on

on

Neutral

01
low
14

8
on
on

Drive
01
Second

1
458
on

on

03

Top
1
000
on
on
on
on

1
Second
1
458
on
on

tl
Second
1
458
on
on

1

II
low
2
458
on
on

rhe

spring
and
the

throttle

pressure
is

led

10
the
throllIe

pressure
18

This

pressure
acts

againsr
the
force
of

spring
of
the

pressure

regulator
valve

CD
and
also

against
the

Ihrollle

pres

sure

16
thus

lowering
the
line

pres

sure
7

The

governor
pressure
also

increases

with

the

speed
of
vehicle

exerting
a

pressure
on
one
side
of

the
1st

2nd

shift

valve
and

counteracts
the

throt
lie

p
ssure
19
line

pressure
I
and

the

spring
which
are

exerting
against

the

governor

pressure
Therefore

when

the

governor
pressure
exceeds

this

pressure
the

speed
is

shifted
from

Ihe
I
Sl

gear
10
the

2nd

gear
The

further
the

acceleraror

pedal
is
de

pressed
the

higher
becomes
the

throt

tle

pressure
19

increasing
the

gover

nor

pressure
and

shifting
the

speed

change

point
to
the

higher
side

AT
20

AUTOMATIC
TRANSMISSION

D

range
Low

gear

To

queCon
t
Front

Clutch
LOW

R

B

B
k

B

I

12
I

3

L

12

U
J

I

IL

CID
Vecu
7
t
l

if
Valva

V
lv
TIC
Oil

Pr

r

0

i
Or
in

lV
I

F
Ofll

Lubf
lut

Orific

Check

V
lve
O
inV

Th

onl

O
ain

V
t

ll
Dow
thih

Solenoid

ID
Pt

Modifi
Valv

24

IS

@2nd
J
dShift

V
I
ll

12

3
ht
2nd
Ih
v
tv

S

j
P

Rev
I

IO
V
lv8

Menuel

V
lv

PRND21

NOle
Marked
O
ln

I

i
pres
00
0f

pressu

c
tI
I
GO
8
no

pre
aI
SKondary

Gov
no
V

To

q
econ

te
pr
s

Th
oUI

pt
Lmli

I

P

Irfw

a
ernor
V

Fig
A
T
32
Oil

pressure
circuit

diagram
DJ

range
Low

gear

AT
21

CHASSIS

D

range
2nd

gl
ar

In
this
case
the
rear
dutch
is

applied
and
the
band
brake
holds
the

front
dUh
h
drum

i
onnel
ting
shell

and
sun

gear
from

rotating

The

power
now
takes

place
through

the

input
shaft
into
the
rear

dutch
and

the
front
internal

gear
WHh
the
sun

gear
held

stationary
the

fronr

plane

lacy
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

output
shafr

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
1st

gear
the

st

2nd
shift
valve

4
moves
al

lowing
the

line

pressure
I

to
be

introduced
into
the

line

pressure
8

through
itself
The
line

pressure
8
is

further
led

to
the
line

pressure
9

through
the
second
lock

vaIve@
and

by
locking
the
band

servo
obtains
the

2nd

gear
condition
Fig
A
T

33
Power

transmission

during
D2

range

I

r

J

ITMi

A

T079

Fig
A
T

34
Operation
of
each
mechanism

during
D2

range

C
w
Clutch
low

Band
selva
On

Parking

Range

ratio
reverse
w

y

pawl

Front
Rear

brake
Operation
Rdea5e

clutch

Park
on
on

Reverse
2
182
on
on
on

Ne
ulral

01
low
2
458
on
on

Drive
01

Second
1
458
on
on

OJ

Top
000
on
on
on
on

1
Se
cond
458
on
on

11
Second
1
458
on
on

low
1
458
on
on

AT
22

AUTOMATIC
TRANSMISSION

D

range
2nd

gear

Q
FrO
ll

Cluteh
Low

to
R

B
e

8
eke

Torque

Con
ert

14

Throttle

Beck

up

V
l

iftV
I
a
Q

T
COU

P

R
V

A
Lubfkatlon

11

Drain

14

V
I

l
CID
V

Thro

Valli
7

If
SOle

Wo

Front

Lubrlc
at

n
Orific

Check

V

I
OralnValw

Tt
oW

Q
aln

V

l
S
P

Modit
V

2

S

13

j
P

RIGulato
Vel
@2nd
3
dShIH

V

I

13

c

33J

2nd

ShlftV
I
e

s

Manual

V

I

n

NOla
M
ked
X
r
Drein
r
D

I
U

jeeo
v
Primarv

Gov
no
Valva
Goyarno

Val
Li
p
su

aIGo
no
IMod

pr
surel

Gov
nO

pr
sur

TO

Qu
con

pr

Th
on

p

Fig
A
T
35
Oil

pressure
circuit

diagram
D2

range
2nd

gear

AT
23

I

CHASSIS

D

range
Top
gear

In
Jrd

gear

position
the
fornt
and

rear
dutches
are

applied
The

power

flow
takes

place
through
the

input

shaft
into
rear

dutch
drum
The
rear

clutch

drum
rotates
the
steel
drive

plates
of
the
rear
dutch
and
the
lined

drive

plates
of

the
rear
dutch
and
the

lined
drive

plates
of
the
fronl
clutch

The
rear

clutch
directs
the

power
flow

through
the
rear

clutch
hub

and
frunt

internal

gear
to
the
front

planet
car

rier

The
front
clutch

directs
the

power

now

through
the

connecting
sheU
to

the

sun

gear
With
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

02
range

2nd

gear
and

the

governor
pressore

I5
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
Fig
A
T
36
Power
transmission

during
D3

range

AT083

Fig
A

T
37

Operation
of
each
mechanism
D3

range

Clutch
Low
Band
servo
On

Parking

Range
c

w

ratio

Front
Rear

brake
Operalion
Release
c1ulCh
pawl

Park
00
on

Reverse
2
182
on
on
on

Ntulral

DI
low
2
458
on
on

Drive
D2
Second

1
458
on
on

OJ

Top
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
24

AUTOMATIC
TRANSMISSION

D

range

Top
gear

Low
r

Fl

B
e

B
e

B

14

TIC
Uil

Pr

1
v

Fl

Lubfk
tlon

O
ein
14

I

Velv8

l

Front

Lub
icet
Orlfiu

Check

V

I
8
6

13

@
2nd
3rd
Shifl

Velv

13

I
O
inV

Throttle

O
in

Ve

l

1

22

21

3
lit
2nd
Shift
Ve

5

M

V

I

5

n

NOle
M

ked
O

ein

Linep
s
Go
no
f
d
P

G
ernorp

Torqu
con
tt

p
secondary

G
norv
Ime

v

Governor
v

Th
Olt

p

Fig
A
T
38
Oil

pressure
circuit

diagram
D3

range
Top

gear

AT
25

CHASSIS

1

range
kick
down

lli1e

llperJling
JI

speeds
ht
Ii1

approximately
8U
to
90
km
h

50
to

56
i

1PII
J

kid
3rJ
2nJ
d0wnslllft

an
he
1

clllllplish
d

hy
fully
de

pressing
the
accelerator

A
kick
3rd
lsl
Of
nd
lst

downshift

can
also
be

accomplished

below

approximately
40
10
50
km
h

25
to
31
MPIl

When
kick
down
is

performed
the

push
rod

operates
by
the
solenoid

the

valve
is

depressed
downward
and
the

circuit

from
the
line

pressure
7
to

the
line

pressure
13

opens
The
line

pressure
IJ

3
plus
the
force
of
the

2nd
Jrd

shift
valve

spring
oppose

the

governor
pressure
15
at

the

2nd

Jrd
shift
valve

4
and
thus

performs
Jrd
2nd
downshift

op

eration

Moreover
the
line

pressure
13

plus
the

force
of
the
I
st

2nd
shift

valve

spring
oppose
the

governor
pres

sure

15
at
the
I

st
2nd
shift
valve

@
and
thus

perform
Jrd
2nd
or

2nd

I
downshift

operation
Clutch
Ln
l

BJ
nd
Cr
o
o
On

Park

ing

Ge

Range
reverse
way

pawl

rat

Fronl
Real
brake
Operalion
R
lea

c1ulch

Park
on
on

Re
erse
2182
n
on
on

Neulral

01
low
2
458
on
on

Orive
Dl
Second
1
458
on
on

OJ

Top
1
000
on
on
Ion
on

1
Second
1
458
on
on

tl
Second
1
458
on
on

t

low
2
458
on
on

AT
26