Operating
The
Hydratork
Transmission
The
Hydratork
is a
power-shift
transmission
. . .
not an
automatic.
It
consists
of a
torque
con-
verter
and
hydraulically
actuated selector packs.
The
selector packs
eliminate
the
need
for a
clutch
pedal. Each
control
lever
position
selects
only
one
drive gear
ratio.
Operating procedure
is as
follows:
1.
Place
forward-reverse
control
lever
in the
neu-
tral
position
and
start
engine. (See engine start-
ing
procedure
—
pages
36, 38. The
service
brake pedal
should
be
depressed.
NOTE:
If the
engine
can be
started
with
the
control
lever
in a
direction
position,
report
to
the
proper
authority.
2.
Move forward-reverse lever
to
selected direc-
tion
of
travel.
Change
direction
selector lever
only
when
truck
is
stopped.
3.
Select transmission speed
position.
It is
recom-
mended
that
low
speed
be
used when
starting,
negotiating
grades,
and
driving
over unim-
proved surfaces.
Then,
change
to
higher speeds
as
conditions
permit.
Transmission speeds
can
be
changed
while
moving.
Pneumatic
tire
trucks
are
equipped
with
a
range
lever
for
selecting drive
line
reduction.
See
page
27 for
operating
instructions.
NOTE: When changing speeds, learn
to
regulate
engine
RPM to
minimize
load jarring shocks.
Decrease
engine speed when changing
from
low
to
high
and
increase engine speed when chang-
ing
to
low.
4.
Accelerate
as
required.
5.
Inching
with
the
left
foot
pedal
is
described
on
page
23.
Page
24
TRANSMISSION CONTROLS
Code:
OI-335
Oct.
73
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