OPERATION ON ROCKY TERRAIN
a. Tires must be fully inflated to 75 psi (517 kPa) when moving on rough or
rocky terrain. Underinflated tires will cause internal ruptures of tires and damage
b. Before driving over stumps or rocks, make sure the semitrailer can clear
them. Such objects can damage components on the underside of the semitrailer.
Beware of low hanging limbs that can damage cargo.
c. Be sure you have a serviceable spare tire because there is a greater chance of
Do not exceed fording depth of 30 in. (76 cm) or
damage to the equipment may result.
(1) Before entering water, check bottom surface conditions. If bottom is too
soft, do not ford.
(2) Cables and terminals must be protected by spraying with ignition insulation
(1) After coming out of water, apply brakes a few times to help dry out brake
linings. Make sure semitrailer brakes are working before driving at normal
(2) Drain or dry all areas where water has collected.
(3) Lubricate all unpainted surfaces.
(4) Wheel bearings should be cleaned and repacked with lubricant as specified
on the lubrication chart (fig. 3-1) after each submersion.
(5) Dry all lubrication points and lubricate as specified on the lubrication
OPERATION WITH AIR BRAKE FAILURE (CAGING SPRING BRAKE CHAMBERS)
This is an emergency procedure that is to be used only
to move the semitrailer off the traveled portion of the
road when a brake line or other part fails causing
loss of air brake system air pressure.