Datsun 620 Series 1977 User Manual

Automatic
Transmission
LINE PRESSURE
GOVERNOR
FEED
PRESSURE
At
cut back
point
After cut
back
Throttle
opening
under
approximately
over
approximately
15
kmfh
10
MPH
35 kmfh
22 MPH
Unit
mmHg
Unit
kgfcm2 psi
Unit
kgfcm2 psi
Full throtlle
0
9
4
to
11
0
134
to
156 55 to 65 78
to
92
Minill1um throttle
450 3
0 to
4
0 43to
57 3 0
to 4 0
43
to
57
Fulllhrotlle
0 10
0
to
12 0
142
to
171
5
5 to
7 0
78
to 100
Minimum
throttle 450
6 0 to 12 0 85to171 5 5 to 7 0 78 to 100
Full throtlle 0
14 0 to
16
0 199
to
228
14 0 to 16
0 199
to 228
Minimum
throttle 450
3 0 to 5 5 43 to 78
3 0 to
5
5 4 lo
78
Range
D
2
R
Notes
a
The line
pressure
during
idling
corresponds
to the oil
pressure
before cut down
at
minimum throttle
b
The oil
pressure
After cut back means that
after the
pressure
modifier valve has
operated
JUDGEMENT
IN MEASURING
LINE
PRESSURE
Low
idling
line
pressure
in the
ranges
D 2 I R and pH
This can be
atlributed to trouble
in
the
pressure
supply system
or
too low
output
of
power
caused
by
I
A worn
oil
pump
2
An
oil
pressure
leak in the oil
pump
valve
body
or case
3
A
sticking regulator
valve
2 Low
idling
line
pressure
in cer
tain
ranges
only
This
is
presumably
caused
by
an oil
leak in the devices or
circuits con
nected to the relevant
ranges
I
When
there
is an oil leak
in
the
rear clutch and
governor
the line
pressure
in D 2
and I
are
low
but the
pressure
is
norrrial in R
2 When an oil leak
occurs in the
low
and
reverse
brake circuit the line
pressure
in R and P are low but
the
pressure
is normal in D
2
and
I
3
High idling
line
pressure
This is
presumably
caused
by
an
increased vacuum
throttle
pressure
owing
to a leak
in
the vacuum tube or
dia
phragm
or
by
an increased line
pressure
due to a
sticking
regulator
valve
Vacuum leakage
is checked
by
directly measuring
the
negative pres
sure after
removing
the vacuum
pipe
A
puncture
of the vacuum dia
phragm
can be
easily
ascertained
because the
torque
converter oil is
absorbed into the
engine
and the
exhaust
pipe
emits
white
smoke
4
Items to be checked when the
line
pressure
is
increasing
In
this check the line
pressure
should be measured with vacuums of
450
mmHg
and
0
mmHg
in accordance
with the stall test
procedure
I If
the
line
pressure
do not
n
crease
despite
the vacuum
decrease
check whether
the
vacuum
rod
is
incorporated
2 If the line
pressure
do not
meet
the standard
it is
caused
mostly by
a
sticking pressure regulating
valve
pres
sure
regulating
valve
plug
or
amplifier
TROUBLE SHOOTING
CHART
INSPECTING
ITEMS
1
Inspection
with
automatic trans
mission on vehicle
AT 53
A
Oil level
B
Ra lge
select
linkage
C Inhibitor switch
and
wiring
D Vacuum
diaphragm
and
piping
E Downshift solenoid kickdown
switch and
wiring
F
Engine
idling
rpm
G Oil
pressure
throttle
H
Engine
stall
rpm
I Rear lubrication
J Control valve manual
K Governor valve
L Band servo
M Transmission air check
N Oil
quantity
o
Ignition
switch
and starter motor
P
Engine
adjustment
and brake in
spection
2
Inspection
after
inspecting
auto
matic
transmission
on
vehicle
m Rear clutch
n Front clutch
q
Band brake
r
Low and reverse brake
s
Oil
pump
t
Leakage
of oil
passage
u
One
way
clutch of
troque
coilVerter
v
One
way
clutch of transmission
w
Front clutch check ball
x Parking
linkage
y
Planetary
gear

Datsun 620 Series 1977 Specifications

General

Brand	Datsun
Model	620 Series 1977
Category	Automobile
Language	English