![Paccar Peterbilt 587 Скачать руководство пользователя страница 86](http://html1.mh-extra.com/html/paccar/peterbilt-587/peterbilt-587_owners-manual_745536086.webp)
INSPECTION OF THE RESTRAINT SYSTEM
PART 5: SEAT AND RESTRAINT SYSTEMS
– 84 –
Y53-6032
(R05/10)
The typical three-point seat systems in passenger cars
may seem very similar to the three-point seat belt system
in heavy duty vehicles, but there are some key differences
that all users of this system should be aware of:
• In typical passenger vehicle automotive seat belt
applications, the normal life of the vehicles is usually 8
to 10 years and the total mileage frequently does not
exceed 125,000 miles (200,000 km). Heavy duty vehi-
cles often see this type of mileage in a very short
period of time, and accumulation of mileage in excess
of 500,000 miles (800,000 km) during the vehicle life-
time is not unusual.
• A significant difference in the two systems is the
amount of movement of webbing in the system. In an
automotive application, there is little movement of the
seat belt system, except when the user puts on or
takes off the belt. In trucks, however, there is almost
constant movement of the belt through hardware due
to ride characteristics and seats which are designed
to move, in order to enhance driver comfort. There
can even be movement of the webbing in the seat belt
system when the belt in not being used. Relative
movement between the seat and the cab, which nor-
mally occurs whenever the truck is in operation, can
cause wear of the seat belt webbing.
• Environmental conditions represent another major dif-
ference in the systems in automobiles and heavy duty
and specialty vehicles. Unlike the automotive environ-
ment, heavy duty and specialty vehicles may be very
dirty, and have more exposure to the sun’s damaging
ultraviolet rays, thus resulting in a reduction of the life
of the seat belt system.
The high mileage associated with heavy duty vehicles and
possible wear of the 3-point seat belt system, the contin-
ual relative movement of the system, the possible contact
with the vehicle seat or other parts of the cab structure,
and the potential exposure of this system to severe envi-
ronmental conditions make it crucial to inspect the three-
point seat belt systems regularly.
It is recommended that the seat belt system in a vehicle
be inspected every 20,000 miles (32,000 km) or more
often if the vehicle is exposed to severe environmental
conditions. Any seat belt system that shows cuts, fraying,
extreme or unusual wear, significant discoloration due to
UV exposure, abrasion to the seat belt webbing, or dam-
Y53-6032.book Page 84 Monday, May 24, 2010 3:37 PM
Содержание Peterbilt 587
Страница 1: ......