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6
Shift Commond
The
l-2
shift volve
controls
the
l-2
qnd
2-
l
shifts
when
the
selector
is
moved
from
\
lo
2 or 2
to
I
ronges.
It
olso
controls
the
monuol
2-l
down-
sh
ift.
Spring
pressure
ond
governor
pres-
sures
oct
to
hold
lhe
l-2
shift
volve
in
the open (front
servo
opply)
position.
ln I
drive ronge control
pressure
octs
on the volve
to
close
the
volve
for front
servo
releose.
2.3
SHIFT
VALVE
Column Shift
The
2-3 shift volve
controls
the
2-3
ond 3-2
shifts
in
D-l
ond D-2
ronges.
The 2-3 shift volve
controls
the
reor
clutch
opply ond front
servo
re-
leose
pressures.
Throttle
pressure
ond
the shift
volve
spring exert
pressure
to
hold the
shift
volve
in
the closed position.
Governor
pressure
ocls
to
open
the shift
volve.
Shift Commond
The
2-3 shift volve
operotes
essen-
tiolly the
some
in the D ronge
os
the
column control
type in the D-,I,
D-2
rqnges.
A
monuol D
to
I
or 2
ronge
shift
is
controlled
by
governor
pressure
on
the
2-3 shift voive.
RANGE CONTROL VALVE
Column
Shift
The
ronge control volve
controls
the
oil
possoge
to
the
governor
oreo
of
the
I
-2
shift volve.
ln
the
D-l
posi-
tion
governor
pressure is
routed
to
the
governor
oreo
of
the
l-2
shift
volve.
ln the D-2
position
control
pressure
is
routed
to
the
governor
oreo
of
the
'|
-2 shift volve
to
hold the shift
volve
in the
open
position.
Shift Commond
The
ronge control volve controls
the
oil
possoge
to the governor oreo
of
the
I-2
shift volve.
ln the D ond
i
drive
ronge
positions,
governor
pressure
is
routed
to
the
governor
oreo
of
the
FLASH-O-MATIC
TRANSMISSION
l-2
shift
volve.
ln the
2 drive ronge
po-
sition,
control
pressure
is routed
to
the
governor
oreo
o{ the I-2
shift
volve
to hold
the shift volve
in
the open
po-
sition.
The servo
oriflce control volve
con-
trols the rote
of
front
servo releose
for
shifting.
The servo
oriflce control volve
is
spring
looded
in the orifice
restricted
position. Governor pressure
controls
the volve
position
for
open
positions.
FRONT
CLUTCH ORIFICE
CONTROL VALVE
The
front
clutch
oriflce
control
volve
controls
the rote
of
front
clutch
op-
plv.
The
front
clutch orifice control
volve
is
spring looded
to
the
closed position,
routing
opply
pressure
through
o
re-
stricting
orifice. Front clutch
pressure
moves
the
orifice volve to the open
un-
restricted
position.
HYDRAULIC
SYSTEM
OPERATION
Column Shift
D-l
Drive Ronge
When the
selector
lever is
ploced
in
the
D-
I
ronge,
the
monuol
volve
is
moved
to
open
circuits
2,
ond
3
(Fig.
I
I
).
Circuit
2
directs
control
pressure
to
the
2-3
shift volve.
Circuit
3
directs
control
pressure to
ports
ot
the front
clutch
orifice
con-
trol
volve, through
on
orifice
to
the
{ront
clutch ond governor,
the
l-2
shift
volve,
ond on end
of
the front
clutch
orifice control
volve.
I
st
Geor D-l
As
front
clutch
opply
pressure builds
up, the front
clutch oriflce
volve
is
moved
to
open
unrestricted
possoges
to the front
clutch, governor,
ond
the
'|
-2 shift volve.
With the front
clutch engoged,
the
primory
sun
geor
ottempts
to
turn
the
plonetory corrier
counterclockwise.
The
one
woy
sprog clutch holds
the
cor-
rier from
turning, therefore,
the
trons-
mission
is
in
1st geor.
Second
Geor
D-1
The
l
-2
shift
will
occur when
the
{orce
of
governor
pressure
overcomes
the throttle
pressure
ond spring
pres-
sure forces
on
the
l-2
shift
volve.
When
the
l-2
shift volve
moves, the
front
servo
opply
possoge
is
opened.
The
front clutch
remoins
engoged
ond the front bond, holding the
sec-
ondory
sun
geor
is
opplied,
therefore,
the
tronsmission
is
in
second geor.
Third
Geor D-l
The
2-3 shift
occurs
when
governor
pressure overcomes
the
combined
forces
of
throttle ond spring
pressures
on the 2-3
shift volve.
When the
2-3
shift
volve
moves, the
reor
clutch
opply ond front
servo
re-
leose
possoges
ore
opened.
The
front
clutch
remoins
engoged,
the reor
clutch
is
engoged
ond
the
front
servo
is
releosed, therefore,
the
tronsmission
is
in third
geor.
D-2 Drive Ronge
When the selector lever
is moved to
the D-2
driving ronge,
the
monuol
volve is
moved
to
open circuits
l,
2,
ond
3.
Circuit
I
directs
control
pressure to
ronge control volve. The ronge
control
volve is
moved
to
direct control
pres-
sure
to
the
governor
oreo
of lhe
1-2
shift volve.
Circuit
2
directs
control
pressure to
the 2-3 shift volve.
Circuit
3
directs
control
pressure to
the front
clutch
oriflce control
volve,
through the oriflce
to
the
front
clutch
ond
governor,
the l-2
shift volve
ond
the front
clutch
orifice
volve.
2nd
Geor (Stort)
D-2
As
f
ront
clutch
opply
pressure
builds up, the
front
clutch oriflce
volve
is
moved
to
open
unrestricted
possoges
to
lhe front
clutch, governor,
ond
the
i-2
shift volve.
Control
pressure
f
rom
the
ronge
control volve
shifts
the l-2
shift
volve
opening
the
f
ront
servo
opply
possoge.
With the front
clutch
engoged
ond
the front bond holding the
secondory
sun
geor,
the
tronsmission
is in
second
geor.
Governor
pressure
octs
to
open
the
shift volve.
SERVO
ORIFICE
CONTROL
VALVE
L
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