Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
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Transmission and Clutch<br />
As the clutch pedal is depressed further, with harder pressure,<br />
the release yoke moves the release bearing away from<br />
the engine. This causes the clutch plate to release from the<br />
driven disks in the clutch. This is called release travel. And<br />
finally, on 9-, 10-, and 11-speed transmissions, as the pedal<br />
is pushed to the last 1/2 to 1 inch of travel, the release bearing<br />
contacts and engages the clutch brake. This is called<br />
clutch brake squeeze. When the clutch wears, the release<br />
bearing gradually moves toward the engine, decreasing free<br />
pedal and free travel. When all free pedal and free travel are<br />
gone, the clutch requires adjustment.<br />
The clutch is adjusted by turning an adjustment ring that is<br />
built into the clutch. When the ring is turned, the release<br />
bearing moves back toward the transmission, restoring free<br />
pedal and clutch free travel. Under normal clutch wear this is<br />
the only adjustment needed. Do not attempt to change any<br />
other component. See the <strong>Medium</strong> <strong>Duty</strong> Maintenance <strong>Manual</strong><br />
for details.<br />
Clutch Adjustment — Normal Wear<br />
Preventive Maintenance<br />
Clutch pedal free travel is usually 1 3/4 in. to 2 in. (34 to 51<br />
mm). This should be your guide for determining whether your<br />
truck needs clutch adjustment. Also, if it becomes increasingly<br />
difficult to shift into gears, or the truck creeps with the<br />
clutch pedal depressed, your clutch needs adjustment. See<br />
the <strong>Medium</strong> <strong>Duty</strong> Maintenance <strong>Manual</strong> for the proper<br />
adjustment procedures.<br />
Some vehicles have automatic clutch adjustment. If yours<br />
doesn't have this feature, adjustment will have to be done by<br />
a trained certified mechanic. Have the adjustment done<br />
before clutch pedal free travel is reduced to the minimum<br />
allowable 1/2 in. (13mm).<br />
Clutch Linkage<br />
The <strong>Medium</strong> <strong>Duty</strong> is equipped with a rod and lever mechanical<br />
clutch linkage. Lubricate each pivot point on the clutch<br />
linkage.<br />
– 204 – Y53-6008 <strong>Medium</strong> <strong>Duty</strong> (R10/06)