Install the assembly onto the mount and position the bearing housings within the scribe marks on the mount
Install the fasteners and tighten into place.
Without disconnecting the chain or choker around the drum, lower the crane or hoist so that the weight of the
drum is on the trunnion. Check the trunnion to drum ring surface and see that it is aligned correctly. Adjust if
necessary following the procedures in Section 3-3-9.
Install the guard.
This procedure may be repeated for the other trunnions and for the guide wheels. It is recommended that only one
trunnion assembly be removed at a time.
Drum Trunnion Alignment
A DRUM ALIGNMENT
When the drum is rotated under power without material in it, the feed end tire should ride just above the thrust wheel on
the discharge side of the rear tire. Materiel fed into the drum will tend to move the drum toward the feed end so that the
feed end tire will run between the thrust rollers. If the drum runs heavily against the discharge side thrust roller, raise the
trunnion slightly on the discharge side nearest the discharge chute or raise the trunnion slightly on the side opposite the
discharge nearest the burner end by jacking under the frame of the plant This will move the drum away from the discharge
side thrust roller and toward the feed end.
If the drum runs heavily against the feed end thrust roller, raise the trunnion slightly on the discharge side nearest the feed
end or raise the trunnion slightly on the side opposite the discharge nearest the discharge end by jacking under the frame
of the plant. This will move the drum away from the feed side thrust roller and toward the discharge end.
B TRUNNION ALIGNMENT
The following is a list of indications that the trunnion rollers are not properly aligned.
Pinging of trunnion rollers with blue spots appearing on the surface of the tire.
Uneven wear on the drum tires or trunnion rollers.
Excessive movement of drum to the feed or discharge end.
Excessive bearing temperatures
The center line of the drum and all rollers must be parallel. Use a straight edge and tape measure for this procedure.