TM 9-2320-211-20
2-203. Trailer Brake Couplings
b. Installation.
(1) Position the air supply valve on the cab
a. Removal.
cow, and secure it with two capscrews and safety
(1) If necessary, close the cutout cock (fig. 2 -
nuts.
189) at the coupling or couplings to be removed.
(2) Position the air supply line at the inlet part
( 2 ) Remove the dummy coupling from the
of the air supply valve (10, fig. 2-188) and tighten
trailer brake coupling (fig. 2-189).
the connector.
(3) Unscrew the trailer brake coupling from
(3) Screw the cap on the air supply valve
the cutout cock or elbow, and remove the coupling
outlet.
(4) Close the drain cock on the underside of
NOTE
the lower air reservoir (16, fig. 2-188).
The cutout cock is open when the handle is
at a 900 angle with the body of the cock.
2-205. Air Lines and Fittings
Stops are provided to prevent the handle
a. Removal.
from being turned beyond its normal open
(1) Open the drain cock on the underside of
and closed positions.
the lower air reservoir.
b. Installation.
(2) Unscrew the connectors at both ends of
(1) Turn the coupling onto the cutout cock or
the line.
elbow at the threaded end (fig. 2-189).
( 3 ) Where necessary, remove the nut and
(2) Connect the dummy coupling to the trailer
screw securing the air line clip to the vehicle.
brake coupling to prevent dirt or foreign matter
Remove the line.
from entering the compressed air system lines.
(4) Where necessary, remove the fittings (tees,
check valves, junction block; etc.) from the vehicle.
2 - 2 0 4 . Air Supply Valves
b. Installation.
a. Removal.
(1) Where necessary, install the fittings on the
(1) Open the drain cock on the underside of
vehicle, and tighten them in place.
the lower air reservoir (16, fig. 2-188) to relieve the
(2) Where necessary, position the line and clip
pressure in the compressed air system.
on the vehicle, and secure the clip with a screw and
(2) Unscrew the connector securing the air
nut.
supply line to the air supply valve (10, fig. 2-188).
(3) Screw the connectors at both ends of the
(3) Unscrew the cap from the air supply valve.
line into place. Tighten the connectors.
(4) Remove the two safety nuts and capscrews
(4) Close the drain cock at the underside of
securing the air supply valve to the cab cowl, and
the lower air reservoir.
remove the valve.
Section XXXI. MAINTENANCE OF WHEELS, HUBS, AND DRUMS
2-206. General
are of the offset-disk type, and are interchangeable
between the front and rear axles and on opposite
sides of the vehicle. Two types of tire mountings are
used. Some of the wheels are equipped with snap-on
type side rings. The wheels are secured by capnuts
installed on the mounting studs at the hub flanges.
The capnuts are interchangeable between hubs on
the same side, but not between hubs on the opposite
sides of the vehicle.
side ring (14.00x20 tires).
