Datsun 620 Series 1977 User Manual

plate
The
parking
rod
pin operates
the
rod
at p
range
and
operates
the
mechanical
lock
system
The
above described manual shaft is
further
equipped
with
an inhibitor
switch A
rotor
inside
the
inhibitor
switch
rotates in
response
to each
range
When tne
range
is
selected
at
p or
N the
rotor
closes
the
starter
magnet
circuit
so that the
engine
can be started When the
range
is
selected at R the rolor closes the
back
up
lamp
circuit and the back
up
lamp
lights
CD
1 Manual
pia
te
2 Inhibitor
switch
ATOB7
Parking
rod
Manual shaft
Fig
AT 4
Manual
linkage
VACUUM
DIAPHRAGM
The
vacuum
diaphragm
is
installed
on the left
center
portio
n of the
transmission
case The
internal con
struction of the
vacuum
diaphragm
is
as follows
A rubber
diaphragm
forms a
parti
tion in
the
center The
engine
intake
manifold
negative pressure
l
led
through
a
vacuum
tube and
spring
force is
applied
to the front surfaceof
the
rubber
diaphragm
while
atmos
pheric
pressure
is
applied
to
the back
surface The
difference
between
pres
sure
applied
to the front and
ba K
I
surfaces causes
a
vacuum reactIOn
which activates the throttle valve of
the control valve inside the transrhis
sion
case
Wheri
accelerator
pedal
is
fully
de
pressed
and the buretor
is
fU
IIy
opened
but th
engirie
sp
eed
is
not
suificientl
increased
the
manifold
negative plre
sure
lowers
Le
tends
towards
atmospheric
pressure
and the
Automatic
Transmission
vacuum
reaction increases since
the
flow
velocity
of mixture inside the
intake m mifold is slow
Contrarily
when
the
engine speed
increases and
the flow
velocity
of
the
mixture in
creases
or
when
the carburetor
is
closed
the
manifold
negative
pressure
increases Le tends
towards vacuum
and
the
vacuum
reaction is
reduced
Thus
a
signal
to
genera
Ie
hydraulic
pressure
P
rfe
tly
suited
to the
engine
loading
at
trye
control valve
is
trans
mitted from the vacuum
diaphragm
and the most suitable
timing
for
speed
change
and lin e
pressure
is obtaine
so
that the
most
proper torque capacity
is
obtained
against
the
transmitting
torque
To
inllkc
manifold
AT088
Fig
AT 5 Vacuum
diaphragm
DOWNSHIFT
SOLENOID
T e
downshift solenoid is
of a
magnetic type
installed on
the left
re r
portion
of the transmission
case When
a driver
requires
accelerating power
and
dePresses
the
accelerator
pedal
down
to the
stopper
a kickdown
switch
19ca
ted in the
middle of
the
accelerator
link
is
depressed
by
a
push
rod he
kickdown switch
doses
cur
rent flows to
the solenoid
the
sole
noid
push
rod is
depressed
the down
shift valve of the
control valvc insidc
the
transmi ssion
case is
depressed
nd
the
speed
is
changed
forcedly
fmm
3rd to 2nd within a cerlaill
vehi
cle
speed
limit
Note Since theki
kdown switch
closes when the accelerator
pedal
is
d
epr
ssed from
7
i
t I S I 6
of tiie
whole
stroke the a
ccel rator
ped
1
should
be correctly
adjusted
so as
arf
rd
a
omplete
stro
e
I
The
arrangement
of the
swit
h
wries
ccording
m
eI
AT
S
c
C
r
11
I
Kickdown
h
switch
Dowri
shift
solenoid
AT089
Fig
AT 6
Downshifl80lenoid
GOVERNER
VALVE
The
primary
and
secondary
gover
nor valves are installed
separately
on
the
back of the oil distributor
on
the
transmission
outp
t
sha ft
tn
y op
erate
al the same
speed
as th
ar
iJf
tile
output
shaft thai is
they operate
at
a
speed
in
proportion
10
the vehicle
speed
The line
press
retis
applied
to
those valves
s
the
input
from the
control
valve
through
the
transmission
case
rear
flange
and oil distributor
The
governor
pressure
in
proportion
to the
ouiput
shaft
speed
vehicle
speed
is
led to the shift valve ofthe
control valve
through
the
opposite
route of the
output
In
this manner
speed change
and line
pressure
are
controlled
Operation
of
secondary
governor valve
T
e
secon
ary
valve
is
a
contro
valve
Y
hich receives
line
pressure
an
cqQ
rols the
governor
pressu
e
When the manual
valve is selected
at D 2
or l
range
line
pressure
is
applied
t the ri
g
sh
aped
area of
this valve from circuit I
l
and this
I
v
Jy
is
depressed
lOW jr tI c
fer
Movemcnt
of
this valvl III a cr
in
positillll doses
the dr uit
from
Olto
15
while
simultaneously
making
a
sr
rronl IS to Iii center
d niin
port
and
press
re
in tllc
cirJ
it
l5j
is
lowered
When
thc vehicle
is
stopped
1
d
the
cenlrifugal
force of this valve is zero
the
v lve
is balanced At this
poini
a
govcr
lOr
pressurc y
hich
bal i1
nced
with
th
spr ng
force
occurs on IS
Wh n
thc vehicle is
st rted
nd
the
centrifugal
fqr
incre
ses this valve
movcs
slightly
10
Ihc oUlSide and
as

Datsun 620 Series 1977 Specifications

General

Brand	Datsun
Model	620 Series 1977
Category	Automobile
Language	English