TM 9-2330-294-14
Figure 2-7. Retractable clearance light assembly (semitrailer No. 201 and on ).
2-7. Air Suspension Controls
raise the two rear axles for better maneuverability or
wheel changing, and to raise the two front axles if
the semitrailer is without payload to aid wheel
a. General. The air suspension controls consist of
changing. The four shutoff valves isolate com-
a suspension air control valve and four shutoff
ponents of the suspension system and are used to
valves. The suspension control valve is used to
shut off the air supply in the event of air leakage or
equalize axle loads by providing proper pressure to
component damage.
the air springs for the payload being transported, to