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 GENCY. Open the shut-off valves on the air lines of
From
the
towing
vehicle,
apply
the towing vehicle.
the brakes on the semitrailer.
Note. This operation is performed at this time to lock the brakes
on the semitrailer and prevent movement of the semitrailer which
might damage the landing gear.
(4) Couple towing vehicle and semitrailer. M a k e s u r e t h a t
the coupler jaws of the towing vehicle fifth wheel are
open. Slowly back the towing vehicle fifth wheel under
the semitrailer fifth wheel upper plate (figs. 1-3) until
the coupler jaws engage the semitrailer kingpin (figs.
1-3), locking automatically. Make certain that the coup-
l i n g is secure by trying to pull the towing vehicle forward
with the semitrailer brakes set.
C a u t i o n : If
the
coupling
operation
is
not
complete
and another attempt to couple must be made, pull the
towing
vehicle
forward
carefully
and
within
the
limits
of the air hose.
The air hose cannot be stretched.
(5) C o n n e c t i n t e r v e h i c u l a r c a b l e - c h e c k l i g h t s . P l u g
the
intervehicular
cable
into
the
receptacle
or
socket
(figs,
28 and 29) on the nose of the semitrailer. Operate
the
lights
from
the
towing
vehicle
to
make
certain
that all are in working order.
Note. The lamps of the semitrailer lights must be of the same
voltage as the electrical system of the towing vehicle,
(6) Raise
landing
gear
landing gear operating handcrank from its holder, en-
gage the handcrank on its shaft, and rotate the hand-
crank to raise the shoes of the landing gear as high
as
they
will
go
to
provide
maximum
clearance.
En-
gage the handcrank in its holder.
Move the semitrailer
forward
to
(7) S t o w c h o c k b l o c k s .
r e l e a s e the chock blocks. Install chock blocks and chains
on their brackets.
c. Operating Towing Vehicle and Semitrailer.
(1) D r i v i n g . In driving a towing vehicle with semitrailer,
the overall length of the unit must be kept in mind
when passing other vehicles and when turning. Because
the
combined
unit
is
hinged
at
the
fifth
wheel,
turn-
ing and backing are affected. The distribution of weight
has its effect on stopping.
(2) Turning. When
turning
corners,
allow
for
the
fact
that
the
semitrailer
wheels
turn inside the turning
To make a right turn
radius
of
the
towing
vehicle.
TAGO 1321B
49
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