GENCY. Open the shut-off valves on the air lines of
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
and another attempt to couple must be made, pull the
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
28 and 29) on the nose of the semitrailer. Operate
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,
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
gage the handcrank in its holder.
Move the semitrailer
(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
ing and backing are affected. The distribution of weight
has its effect on stopping.
(2) Turning. When
turn inside the turning
To make a right turn