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PUSH
BUTTON CONTROL UNIT AND LINKAGE
DESCRIPTION AND OPERATION
Description
Gear
range
selection is obtained
by pressing in
one of
the
foul' push button
control
unit
push
buttons
mounted
on
the instrument panel to the
left of
the steering column.
56",38
Fig. 3
-
Push Bullon Control Unit
(Showing
Arrangement
of
PUlh Buttons)
As
13hown
in Figure 3, four buttons provide
the
ranges
of
N~neutral,
D-dl'ive,
L-Iow,
and
R-reverse. A hydraulic blocker valve prevents
the driver
from inadvertenlly using the R-re-
verse range when the car
is
traveling
forward
a
bove
10 mph.
.
VOTE: Should the opemto1' engage the
R-rc-
vert~e
button at a speed in excess
of 10 mph, the
manual
valve
would be
moved
to
the N-neutml
position and
when the ea?'
speed
dl'opped
below
10
mph
the operat01'
would
again be 1'equiTed to
select the
P1'OpeT push button.
All the
push buttons are illuminated by a
single bulb. The push
buttons
are moved
ap~
proximately
l
o/t
G
inch in
operation
and require
a pressure of 3 to
5
pounds
to operate.
NOTE:
N-neutml button
?/lU8t be
engaged
be-
f
O
l·e engine will
start.
Mechanical connection belween the
push
but~
lon
unit and the
transmission
manual control
valve
is obtained through the use of a single
pu
s
h~pull
cable. One end of the wire cable is
secured
to the cable
actuator
in
the
push button
control
unit
(Fig. 5) while the
other end
enters
the
transmission case (Fig, 7)
to
engage
the
manual
control
valve lever assembly.
64
Fig.
4
-
Push
Bullon (ontrol
Unit
{(utowoy
View)
A
CTUATOR
Fig.
5 -
Exterior
View of Push Bulton
(onlrol Unil
Operation
(Refer
to
Figs.
4 and
5)
When a push button control unit button is
pushed in, the push button operating slide
con-
tacts the cable actuator, causing it to
pivot .
Movement
of
the cable actuator
about
its
axis,
moves the attached wire cable.
When the
push
hulton reaches its
limit
of
travel, a
relieved
portion on
the
push button
operating slide passes under the operating slide
lock pawl. This action allows the
sp
ring~loaded
pawl to lock the push bulton in
the
engaged
position.
The movement of the
w ire
cable
transforms
the rotary motion
of the
cable actuator
into
linear motion
to
position the
transmission
man-
ual control valve in the
selected
range.
When the
operator
pushes another
button
to
se
l~ct
a different
range,
the following events
take place:
During initial
movement of the
push button
operating slide,
the edge of the detent on the
slide
strikes
the lock
pawl
,
thereby
r
eleasi
ng
the
firsl push button from
the
restraint of the lock
'.
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