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TM 9-2320-364-34-1
1-22. PLS TRAILER (PLST).
Figure 1-28. Palletized Load System Trailer (PLST)
The Palletized Load System Trailer (PLST) (Figure 1-28) is a three axle trailer designed to carry a Flatrack (FR) with
a 33,000 lb. (15 metric tons) nominal payload. It can accommodate both full and partial loaded flatracks. Guides
laterally position the FR on the trailer rear stops and these locate the longitudinal position of the FR in relation to the
PLST. These stops prevent the FR from sliding rearward. A pneumatic locking device (1), located between the frame
rails just above the second axle, hooks to engage the lock points and secure the FR to the PLST. An air valve controls
the position of the lock hooks. Springs retain the hooks in the locked position. The PLST has a standard 12 volt
electrical system with 24 volt military adapters (2). Also provided are two intervehicular electrical connecting cables of
sufficient length to reach the towing truck. Two towing eyes (3), at the rear of the PLST permit towing with a medium
duty tow bar. The spare tire carrier is ahead of the second axle in the center of the frame. The spare tire is held in
place with bolts through the wheel bolt pattern. The spare tire and wheel assembly can be raised and secured in the
spare tire carrier by the trailer-provided hand-operated winch. The PLST uses turntable-type steering for tracking and
turning and is equipped with an air braking system. All three axles use 16.5 in. diameter by 7 in. wide (419 mm by 178
mm) S-cam brakes. The PLST has a dual brake system with separate service and emergency brake system. The PLST
brake system is activated and charged by the truck air supply. The brakes are self-adjusting. Refer to
TM 9-2330-385-14 for Operator's, Unit, Direct Support and General Support Maintenance for the PLS Trailer.
a.  Service Brakes. The six service brakes on the PLST are powered by 24/20 inch (61/51 cm) brake chambers.
Six inch automatic slack adjusters are provided with all brake chambers. The service brakes are activated when a signal
from the foot-operated treadle valve or hand operated control valve is sent through a series of relay valves. The relay
valves convert the proportioned service brake signal from the truck into a regulated service brake chamber pressure.

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