2-23. OPERATION IN EXTREME HEAT (Con't).
d. Semitrailers, inactive for long periods in hot, humid weather, are subject to rusting and accumulation of
fungi growth. Frequently inspect, clean, and lubricate to prevent deterioration.
2-24. OPERATION IN SANDY OR DUSTY AREAS.
a. Clean, inspect, and lubricate semitrailer more often in sandy or dusty areas (Chapter 3, Section l).
b. Maintain proper tire pressure:
(1) Reduce tire pressure to 20 psi (138 kPa) for operation in soft sand.
(2) Reduce tire pressure to 30psi (207 kPa) for operatiorton cross-country terrain. Tire pressure must be
returned to 50 psi (345 kPa) when operation resumes on hard-surface roads if tactical situation permits.
c. When uncoupling semitrailer in sandy areas, use ground boards to prevent landing gear from sinking in.
2-25. OPERATION IN HIGH HUMIDITY, HEAVY RAIN, AND SALTWATER AREAS.
a. Dampness increases chances of corrosion. Inspect all surfaces and electrical connections for signs of
corrosion. Remove all signs of corrosion. Apply corrosion preventive compound (Item 11, Appendix E) to all electrical
b. Protect semitrailer from direct rainfall whenever possible. During dry periods, open semitrailer to air to
facilitate drying process.
c. Wash semitrailer thoroughly with clear water if it comes in contact with saltwater.
2-26. OPERATION IN MUD.
a. Immediately after operation in mud, thoroughly clean, inspect, and lubricate if tactical situation permits
b. Pack wheel bearings as required (Chapter 3, Section l).
2-27. OPERATION IN SNOW.
a. Refer to FM 21-305 for special instructions on driving hazards in snow.
b. After each operation, remove ice and snow from underneath semitrailer and from hoses, lines, tubes, and
a. Refer to the towing vehicle operating instructions for information on fording. Towing vehicle instructions
are also applicable to the semitrailer.
b. Pack wheel bearings after each submersion (Chapter 3, Section l).