TRUCK SERVICE MANUAL
Before installing a replacement drum wash
the drum thoroughly with high grade denatured alcohol to
remove all protective grease, oil or other residue. DO NOT
use gasoline, mineral spirits or oil.
In most situations replacement drum, whether for
previously speed nut retained type or swaged-on type, can be
secured with the speed nuts (Fig. 20). However, if swaging is
desired, recommended procedure is as follows.
Obtain appropriate size peen punch (SE-855-7 for
1/2" stud; SE-1103 for 9/16" stud).
Position new drum over studs in hub and temporarily
fasten it against hub flange by placing oversize
washer over three studs and tightening wheel nuts
Using peen punch over stud, align stud and drum in
press with stud properly supported. Press the stud
shoulder in place against drum.
Repeat pressing operation on next open stud.
Reposition washers and repeat pressing operation
until all studs have been swaged.
To assure hub and drum concentricity, take a light
machining cut on drum in drum lathe.
When assemblying hub and drum together on medium and
heavy duty vehicles, pay special attention to the bolt heads so
that they are ,aligned properly in the drum (Fig. 22).
Fig. 22 Drum Bolt Alignment
Refer to Torque Chart for Bolt Tightening sequence
and proper torque values of hub to drum mounting bolts as
well as rim and wheel mountings.
CTS-2779 Page 10
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