Peterbilt 325 2017, Operator'S Manual

Page: 367 / 392

TRANSMISSION AND CLUTCH
called release travel. And finally, on
9-, 10-, and 11-speed transmissions,
as the pedal is pushed to the last 1/2
to 1 inch of travel, the release bearing
contacts and engages the clutch brake.
This is called clutch brake squeeze.
When the clutch wears, the release
bearing gradually moves toward the
engine, decreasing free pedal and free
travel. When all free pedal and free
travel are gone, the clutch requires
adjustment.
The clutch is adjusted by turning an
adjustment ring that is built into the
clutch. When the ring is turned, the
release bearing moves back toward
the transmission, restoring free pedal
and clutch free travel. Under normal
clutch wear this is the only adjustment
needed. Do not attempt to change any
other component. See the Medium
Duty Maintenance Manual for details.
Clutch Adjustment —
Normal Wear
Clutch pedal free travel is usually 1 3/4
in. to 2 in. (34 to 51 mm). This should
be your guide for determining whether
your truck needs clutch adjustment.
Also, if it becomes increasingly difficult
to shift into gears, or the truck creeps
with the clutch pedal depressed, your
clutch needs adjustment. See the
Medium Duty Maintenance Manual for
the proper adjustment procedures.
Some vehicles have automatic clutch
adjustment. If yours doesn't have this
feature, adjustment will have to be
done by a trained certified mechanic.
Have the adjustment done before
clutch pedal free travel is reduced to
the minimum allowable 1/2 in. (13mm).
Clutch Linkage
The Medium Duty is equipped with
a rod and lever mechanical clutch
linkage. Lubricate each pivot point on
the clutch linkage.
(03/17) Y53-6060-1C1
5-157
5