While changing tires or while performing tire maintenance, stay out of the trajectory as shown by the
area indicated. Failure to follow proper procedures may result in injury or death to personnel.
Under some circumstances, the trajectory may deviate from its expected path. Failure to follow proper
procedures may result in injury or death to personnel.
If the tire is underinflated or overinflated, or there is obvious or suspected damage on the tire or wheel
components, the tire must be completely deflated (Para 3-6). To deflate the tire, remove the valve core from the
valve stem and stand out of the trajectory area before the wheel is removed from the trailer or personal injury may
The wheel/tire must be inflated in a safety cage or personal injury or death may result.
If tire has been run flat, or is overinflated or underinflated when tire pressure is measured and operating terrain is
compared to Table 4-15, or if wheel/tire assembly has obvious or suspected damage, it is not safe to adjust tire
pressure. Completely deflate tire according to Para 3-6, and remove the tire from the axle. Failure to follow these
procedures may result in serious personal injury or death.
Tire air pressure must be checked properly or serious injury or death may result.
Table 4-16. Cold Tire Air Pressure
(1) Remove cap from valve stem.
(2) Position tire inflation gage on
(3) Remove and read tire inflation gage
and compare to Table 4-15.
(a) If tire pressure is underinflated or
overinflated, or there is obvious
damage or suspected damage to
tire or wheel, completely deflate
tire before removing from trailer
(b) If tire is not underinflated or
overinflated and wheel/tire is not
damaged, use tire inflation gauge
to lower or raise pressure (Para 3-6).
(c) If tire pressure is correct according
to Table 4-16, tire pressure is OK.
(4) Install cap on valve stem.