WARNING
When working underneath the vehicle
without appropriate
safety stands but
with the wheels on the ground (not
supported), make sure that
• The vehicle is on hard, level
ground.
• The parking brake is applied.
• All wheels are blocked (front and
rear).
• The ignition key is removed to
prevent the engine from starting.
Failure to comply may result in death,
personal injury, equipment or property
damage.
WARNING
NEVER start or let the engine run in
an enclosed,
unventilated area. Ex-
haust fumes from the engine contain
carbon monoxide, a colorless and
odorless gas. Carbon monoxide can
be fatal if inhaled. Failure to comply
may result in property damage, per-
sonal injury, or death.
CAUTION
DO NOT operate the transmission at
an operating
angle greater than 12°
(approximately 21% road grade). The
operating angle is the transmission
mounting angle plus the road grade
expressed as an angle. Failure to
comply will result in improper transmis-
sion lubrication and may result in
equipment or property damage.
The tables on the following pages contain
maintenance tasks. These tasks should be
performed at the interval labeled at the top
of the table, which are based either on
vehicle mileage, or vehicle mileage and
time passed since the last time that task
was performed. Some tasks depend on
vehicle application -- or how and where the
vehicle is operated. These tasks will have
the words ON-HIGHWA
Y, OFF-HIGHWAY,
CITY DELIVERY, or VOCATIONAL after
the description and should be performed if
the vehicle is operated for that application:
• ON-HIGHWAY – Applications
where the vehicle is only used on
paved roads during normal
operation.
• OFF-HIGHWAY – Applications
where the vehicle may be driven off
the pavement on a regular basis,
even if it is an infrequent basis
and/or for a brief time period.
•
CITY DELIVERY – Applications
where frequent start and stopping
is required during normal
operation, and highway use is
infrequent and for short intervals.
• VOCATIONAL – Applications
based on truck configuration and
use and not on operating
environment. Vocational vehicle
components must meet the
requirements needed for its
specific application (such as
delivery, construction, fire service,
refuse, and busing). A truck can be
Vocational in addition to other
application types. Vehicles that fall
into more than one application
category should observe the
earliest and more limiting
application's maintenance
requirements.
MAINTENANCE - Preventative Maintenance
46 Y53-1349-1A1 (02/2022)
6
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