At-25 Power Transmission During "R" Range; At-27 Operation Of Each Mechanism During "R" Range - Datsun 620 Series 1977 Service Manual

R
RANGE REVERSE
In
R
range
the front clutch 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
stationary 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
Automatic Transmission
R
Fig AT 26 Power tranamis ion
during
R
range
m i
1
A
TOBS
Fig A T 21
Optrationof
each mechanism
during R
range
When the manual valve
V
is
posi
Clutch
Low
Band
servo
One
tioned
at R range the oil
having
the
Gear
Partina
Ranae
re ne way
line
pressure
7 is
directed
to
line
ralio
Front Rear
brake
Openlion
Relulie
clutch
plwl
pressure
circuits
5
and 6 The
pressure in the
circuit
5
actuates
the
Park
on on
low and
reverse
brake
after
being
Ruene
2 182
on on on
introduced into line pressure
circuit
Neutral
12 through the
I st
2nd shift valve
ID
The
pressure
in
the
circuit op
DI Low 2 458
on on
erates
the release side of the band
servo
and the front c1u tch after
being
Driowe D2 Second 1458
on on
led
to
line
pressure
circuit
0
D3
Top
1000
on
on on
through
the 2nd 3rd shift valve @
2
Second
1458
The throttle
pressure
I
6 and the line
on
on
pressure
6 which
vary
with the
12
Second S8
on on
degree of accelerator
pedal depression
II
Low 2 458
both
act
the
pressure
regulator
on
on
on
valve CD and
press
against
its
valve
CD
increasing
line pressure 7 In Rn
range the
governor
pressure is absent
making all such valves
as
the 1st 2nd
shift valve ID
lnd
3rd shift valvc
@ and
pressurc
modifier valve
inoperative
AT16