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 Fiqure 28. Controls on nose of semitrailers M270 and M269.
M270A1
under
usual
conditions.
For
operation
under
unusual
conditions, refer to paragraphs 32 and 33.
24.
Kingpin
The kingpin is a machined steel piece which protrudes from
the center of the fifth wheel upper plate of the semitrailer.
It is locked into the fifth wheel coupler jaws of the towing
vehicle in the coupling operation (par. 31) to connect the semi-
trailer to the towing vehicle.
25. Brake Air Hose Couplings
A service air hose coupling and emergency air hose coupling
are mounted in the front cross member of the chassis frame.
When the air hose couplings on the towing vehicle are con-
nected
by
intervehicular
hose
to
these
couplings,
the
service
brakes on the semitrailer may be controlled by the brake con-
trols on the towing vehicle.
26.
Dummy
Couplings
Two dummy couplings are chained to brackets welded to the
front cross member of the chassis frame.
They are provided to
TACO 1321B
45
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