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 fast speed for raising or lowering the landing gear legs when
the semitrailer is coupled to the towing vehicle. To operate
the
handcrank
at
the
slow
speed,
pull
the
handcrank
outward
to its limit of travel, and at the same time, rotate the hand-
crank slightly until resistance is apparent indicating that all
To operate the handcrank at the fast
are
in
mesh.
speed, push the handcrank inward to its limit of travel and
place the gears in mesh.
29.
Spare Wheel
and
Tire
Carrier
Operating
Shaft
The
tire
carrier
operating
shaft projects horizontally from
It is rotated with the wheel
the tire carrier main
member.
nut wrench to raise the spare tire to carrying position and to
lower
the
spare
tire
to
the
ground
for
use.
30. Air Reservoir Drain Cock
The
air
reservoir
is
equipped
with
a
drain
cock
for
the
of
moisture
and
to
permit
the
air
pressure
in
the
semitrailer braking system to be relieved.
31.
Operation Under Usual Conditions
The
before-operation
services
a.
Before-Operation
Service.
specified in table II should be performed before using the semi-
trailer.
b. Coupling Semitrailer to Towing Vehicle.
Remove chock blocks (fig. 14) from their
(1) B l o c k
wheels.
brackets and place them firmly behind the wheels on
each side of the semitrailer.
(2) A
line
towing
vehicle
with
semitrailer. With
an
as-
sistant standing at the semitrailer to guide the driver,
back the towing vehicle slowly to the nose of the semi-
trailer. Maneuver the towing vehicle so that the king-
pin
of
the
semitrailer
is
alined
with
the
fifth wheel coupler jaws on the towing vehicle. Just
before the fifth wheel upper plate (figs. 1-3) of the
semitrailer
starts
to
ride
on
the
fifth
wheel
of
the
towing vehicle, stop the towing vehicle.
(3) Connect
intervehicular
hose.
Make sure that the air
hose coupling on the towing vehicle tagged SERVICE
is hooked up with the air hose coupling (fig. 28)
bearing a similar tag on the semitrailer. This is also
essential in connecting the couplings tagged EMER-
TAGO 1321B
48
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