Datsun 1980 200SX Service Manual page 221

Hydraulic
Control Circuim
AUTOMATIC TRANSMISSION
D
RANGE
2ND
GEAR
MechariicaI
Operation
dtiring
D2 Range
Power flow
Io
D
range
the brake band
is
applied
to
hold the
connecting
sheU
and
sun
gear
stationary Engine
torque
through
the
applied
rear
clutch
is delivered
to
the internal gear of the
front
gear set in
a
clockwise
rotation
Clockwise rotation of the internal
gear
causes
the planet
gears
to
walk
around
the
stationary
sun
gear in
a
clockwise
direction
This causes the
output
shafl which
is
splined
to the
front
planet carrier to turn in
a
clock
wise
direction with
a
reduction
ratio
of about
146 to I
Front gear
set
Rear
gear set
AT331
Front clutch OFF
Rear
clutch ON
LOw
and revelSe biake
OFF
llr Ike band
servo
ON
One
way
clutch OFF
AT079
Fluid flow
As
car
speed and
governor pressure
increase
the governor
pressure
acting
on
the
end
of the
1
2 shift valve
overcomes
the
force of the
1
2 shift
valve spring and line pressure This
aUows the 1 2 shift valve
to
move
to
the
upshift
position which directs line
pressure
through
the 2nd lock valve
and
on
to
the brake
band
Manual Valve Governor Valve
15 Pressure Modifier Valve
2nd 3rd Timing Valve
2nd 3rd Shift Valve
Ist
2rid
Shift Valve
Ist 2nd
Shift Valve
8 Second Lock Valve
9
Band Servo
Apply
Side
4
Rear Clutch
I
2 Second Lock Valve
3
I
Second Lock Valve
L
Orifice Check Valve
2nd 3rd Shift Valve
AT 14