TM 9-2330-235-14&P
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
Page
Paragraph Title
Number
Fording ............................................................................................................................................................
General ...........................................................................................................................................................
Operation in Dusty or Sandy Areas ................................................................................................................
Operation in Extreme Cold or Snow ...............................................................................................................
2-t2
Operation In Extreme Heat .............................................................................................................................
Operation in Rough or Rocky Terrain .............................................................................................................
2-12.
GENERAL.
a. This section contains instructions for safely operating the M514 and M390C Chassis Trailers under unusual
conditions. In addition to normal preventive maintenance and service, special care must be taken to keep the trailers
mission-capable in extreme temperatures and humidity.
b.
For information on special driving instructions under unusual conditions, refer to FM 21-305.
c.
For information on operation in cold weather, refer to FM 9-207.
d.
For information on operation in extreme heat, dusty, or sandy conditions, refer to FM 90-3.
2-13.
OPERATION IN EXTREME COLD OR SNOW.
a. Operation in extreme cold causes lubricants to thicken or freeze and various trailer components to, become
hard and brittle, and therefore easily damaged or broken. The operator must be alert to the effects of extreme cold on the
trailer.
b. When stopped or parked, clean ice, snow, or mud from underneath trailer and from hoses, lines, tubes, and
electrical connections.
c.
When operating in snow, ensure that the tires are inflated to 15 psi (103 kPa) (para 1-10).
d.
Use caution when placing trailer in motion.
(1)
Thickened lubricants may cause failure of trailer components.
(2)
Tires may be frozen to the ground.
If tires were under-inflated, they may have flat spots.
(3)
If brakeshoes are frozen to brakedrums, heat must be applied to brakedrums.
2-14.
OPERATION IN EXTREME HEAT.
a. Do not park trailer in the sun for long periods of time as heat and sunlight will shorten the life of tires and lead
to deterioration of painted surfaces.
b. Trailers, inactive for long periods in hot and humid weather, are subject to rapid rusting and accumulation of
fungus. Frequently inspect, clean, and lubricate to prevent deterioration (Chapter 3, Section I).
2-15.
OPERATION IN DUSTY OR SANDY AREAS.
Frequently inspect, clean, and lubricate to prevent damage to trailer components due to contamination from dust or
sand (Chapter 3, Section I).
2-12
