Datsun C210 series Manual page 221

1
RANGE
LOW
GEAR
When
starting
in 1
range
the
driving
gear is
locked
to
the low gear
ratio
In I
range
the
rear
clutch is
engaged
and the low
and
reverse
brake
holds the
connecting
drum and
rear
planet carrier from
rotating
The
power
flow takes
place through the
input
shaft and
into the
rear
clutch
Rotation of the
rear
clutch drives the
rear
clutch hub and front internal
gear
The front internal 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
gear
clockwise
The
rear
planet
carrier
splined to
the
connecting drum
is
held from
rotating by the low and
reverse
brake
The clockwise
rotation
of the
rear
planetary
gears therefore
rotates
the
rear
internal gear and internal drive
flange The internal drive
flange
is
splined to
the
output
shaft and
rotates
the
output
shaft clockwise However
the
output
shaft
rotate ata
lower
speed compared to
that Of the
input
shaft This
is
caused
by
the
fact that
the front
planet
carrier
rotates at
the
same
speed
as
the output shaft
in
the
same
direction since the carrier is
splined
to
the
output
shaft
The front
internal gear and
planetary
gear
assem
bly
are
rotating
in the
same
direction
but
the
planet
carrier is
rotating
at a
speed
slower than the ring
gear
So the
gear r
tio
of this
speed
range
is
a
combination of
the ratios provided by
the front and
rear
planetary
gear as
semblies
When the manual valve
is
posi
tioned
at
I
the line
pre sure
7 is
applied into
the line pre5sure circuits
I 4
and 5 The oil
pressure in
5
actuates
the low and
reverse
brake
after
being introduced
into the circuit
12
through
the 1st 2nd shift valve
ID
and
the line pressure
acts
on
Automatic Transmission
C
AT076
Fig
AT 43
Power
Tran mtiuion
during
11
Range
ll
I
1J3
r
ox m s
i
i
iI
AT077
Fig AT 44 Operation of
Each Mechani
m
during
I
Range
Clutch
low Band
strVO
On
Parkina
Range
en
reverse way
ratio
Front Rear
brake
Operation
Release
clutch
pa 1
Park
on
on
Reverse 2 t82
on on
on
Neutral
01 Low
2 458
Drive 02 Second t458
03
Top
tOOO
on
on
on
2 Second 1458
on
12
Second t458
on
tt
Low
I
2 458
on on
the
rear
clutch and
governor
The line
pressure
4
acts in
the
same manner as
in 2
range
Similar
to
that of the
D
range
the line pressure increases with
the
degree of accelerator
pedal
depression
and the line pressure decreases with
the increase
of
car
speed
The
governor
pressure
IS
which
acts
on
the
1st
2nd shift valve does
not increase
until it
overcomes
the combined force
of the
line
pressure
12 and the
spring causing
no
I 51
2nd
speed
change
AT 30