OPERATOR'S MANUAL

Preventive Maintenance Introduction
Medium Duty
(R05/09) Y53-6027 – 151 –
•Disconnect the battery ground strap whenever
you work on the fuel system or the electrical
system. When you work around fuel, do not
smoke or work near heaters or other fire hazard.
Keep an approved fire extinguisher handy.
•Always support the vehicle with appropriate
safety stands if it is necessary to work under-
neath the vehicle. A jack is not adequate for this
purpose.
•When working underneath the vehicle without
appropriate safety stands but with the wheels on
the ground (not supported), make sure that (1)
the vehicle is on hard level ground, (2) the park-
ing brake is applied, (3) all wheels are chocked
(front and rear) and (4) the engine cannot be
started. Remove the ignition key.
•Never start or let the engine run in an enclosed,
unventilated area. Exhaust fumes from the
engine contain carbon monoxide, a colorless
and odorless gas. Carbon monoxide can be fatal
if inhaled.
WARNING! Wear protective clothing when
handling
hydraulic fluid. It is mildly toxic and
can cause skin and eye irritation.
CAUTION: Hydraulic brake fluid may damage
painted surfaces of the vehicle.
Incomplete or improper servicing may cause problems in the
operation of the vehicle. If in doubt about any servicing, have
it done by your Authorized Service Center. Improper mainte-
nance during the warranty period may also affect the war-
ranty coverage.
Modifying your vehicle can make it unsafe. Some modifica-
tions can affect your vehicle's electrical system, stability, or
other important functions. Before modifying your vehicle,
check with your Peterbilt Dealer to make sure it can be done
safely and correctly.
Environmental Protection and Material
Hazards
Some of the ingredients in engine oil, hydraulic oil, transmis-
sion and axle oil, engine coolant, diesel fuel, air conditioning
refrigerant (R–134a and PAG oil), batteries, etc., may con-
taminate the environment if spilled or not disposed of prop-