TM 9-2330-359-14&P
2-21. OPERATION IN EXTREME COLD (Con’t).
c. When parking for any period of time in temperatures below 0°F (-18°C), park in a sheltered area out of the
wind and clean off any build-up of ice or snow. Place a footing of planks or brush under tires and landing legs to prevent
them from freezing to the ground. Ensure that the tires are properly inflated (para 1-10). Underinflated tires will freeze,
resulting in flat spots.
d. Be cautious when placing semitrailer in motion after a shutdown. Thickened lubricants may cause failure of
components. Free frozen brakeshoes, or tires frozen to ground, with care.
2-22. OPERATION IN EXTREME HEAT.
a. Refer to Chapter 3, Section I for proper lubrication during extreme heat conditions.
b. Do not park the semitrailer in sunlight for long periods of time. Heat and sunlight shorten tire life.
c. Shelter or cover the semitrailer with tarpaulin, if available.
2-23. OPERATION IN SANDY OR DUSTY AREAS.
a. Clean, Inspect, and lubricate the semitrailer more often in sandy or dusty areas (Chapter 3, Section l).
b. Reduce tire pressure to 25 psi (172 kPa) for maximum mobility in sand.
c. Maximum allowable speed when driving in sand is 20 mph (32 km/h).
2-24. OPERATION IN SALTWATER AREAS.
Clean, inspect, and lubricate the semitrailer more often when operating in saltwater areas (Chapter 3,
Section l).
2-25. OPERATION IN MUD.
a. Immediately after operation in mud, thoroughly clean, inspect, and lubricate if tactical situation permits
(Chapter 3, Section l).
b. Reduce tire pressure to 25 psi (172 kPa) for maximum mobility in mud.
c. Maximum allowable speed when driving in mud is 5 mi/h (8 km/h).
d. If one or more wheels sink into mud, it may be necessary to raise mired wheel and insert planking or
matting beneath it.
2-26. OPERATION IN SNOW.
Refer to FM 21-305 for special instructions on driving hazards in snow.
2-27. FORDING.
Semitrailer will sustain water fording up to a depth of 30 in. (76 cm).
Change 2 2-23/(2-24 Blank)
