35.10 Check straight hose installations (those
hoses that do not bend along their routings).
Pressure changes can cause a hose to
lengthen up to two percent, or shorten up to
four percent. A 100-inch (2540-mm) length of
hose, for example, can contract to 96 inches
(2440 mm). If the hose has no slack when it
is exhausted of air, replace it with one of
adequate length to avoid a possible blow-off
from the fitting during vehicle operation.
35.11 Check for kinked or twisted hoses. A seven-
percent twist in the hose can reduce its life
by up to 90 percent. Also, a twisted hose
under pressure tends to untwist. This could
cause it to loosen the fitting. Reconnect
hoses that are twisted.
36.
Make sure the brakes are adjusted on all axles.
Adjust the brakes if necessary. See Group 42 of
the
Cargo Maintenance Manual
for checking and
adjusting procedures.
IMPORTANT: Brake checking and adjusting is nec-
essary for all vehicles, including trucks equipped
with automatic slack adjusters.
WARNING
Do not operate the vehicle with underinflated or
overinflated tires. Incorrect inflation can stress the
tires and make the tires and rims more susceptible
to damage, possibly leading to rim or tire failure
and loss of vehicle control, resulting in serious per-
sonal injury or death.
37.
Check the tire inflation pressures, and inspect each
tire for bulges, cracks, cuts, and penetrations.
IMPORTANT: The load and cold inflation pres-
sure must not exceed the rim or wheel manu-
facturer’s recommendations, even though the
tire may be approved for a higher load or infla-
tion. Some rims and wheels are stamped with
a maximum load and maximum cold inflation
rating. If they are not stamped, consult the rim
or wheel manufacturer for the correct tire infla-
tion pressure for the vehicle load. If the load
exceeds the maximum rim or wheel capacity,
the load must be adjusted or reduced.
37.1 Check the inflation pressures of the tires be-
fore each trip using an accurate tire pres-
sure gauge (Fig. 9.5). Tires should be
checked when cool. Be sure the valve stem
Pretrip Inspection and Daily Maintenance
9.18
To Next Page
Loading...
