Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Engine Maintenance
Preventive Maintenance
Engine Accesories: Accessory Drive Belts
You can extend the reliability and service life of your vehicle's
drive belts with proper attention to installation, and maintenance.
Neglect could cause belt failure. The result could be
the loss of the electrical or air system as well as possible
engine damage from overheating. So it’s a very good idea to
check your belts frequently and replace them as soon as you
detect trouble.
Follow this procedure to install an accessory drive belt:
1. Rotate the new belt around the pulleys, and then rotate
the automatic tensioner so that the idler pulley swings
toward the belt routing. Figure 1 shows an example of
the rotation direction to release the tensioner.
2. Slip the belt around the idler pulley attached to the automatic
tensioner.
3. Release the automatic tensioner.
4. Check the belt alignment on each pulley. The belt must
fall between the flanges of each pulley.
Engine Fan
Thermatic (Clutch) — Type Fan
WARNING! Do not work on the fan with the
engine running. The engine fan can engage at
any time without warning. Anyone near the fan
when it turns on could be seriously injured.
Before turning on the ignition, be sure that no
one is near the fan.
– 142 – Y53-6008 Medium Duty (R10/06)