TM 9-2330-373-14 & P
1-7. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (cont)
(9) AIR HALF-COUPLING AND DUMMY
COUPLING
Two air half-couplings are located on left side of dolly
frame and two are at front end of semi trailer.
Two additional half-couplings are located at rear of dolly.
They provide the connections
to brake and air
suspension air systems.
The front emergency air connection on dolly is located
slightly to the left of service air connection.
Dummy couplings are located next to air half-couplings
and are used to keep dirt from entering when the system
is not connected.
(10) INTERNAL BRAKE MECHANISM
Each brake mechanism is located within the brake drum
and is supported by a backing plate.
Each one has two brake shoes fitted with brake linings.
Two hydraulic wheel cylinders are mounted between the
ends of the brake shoes.
q. DOLLY ELECTRICAL SYSTEM
Wiring harnesses are located along the inside left rail of dolly frame. They extend from electrical inlet receptacle at front of
dolly to stoplight taillights and rear electrical receptacle.
TA 314698
1-15
