TSE T50 BWRC, Owner'S Manual, Page: 89 / 129

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.090" on the diameter, the drum must be replaced. When turning
the drum surface, the maximum rebore diameter is as follows:
”
7" Brake Drum-7.090" diameter
”
10" Brake Drum-10.090" diameter
”
12" Brake Drum-12.090" diameter
”
12 1 /
4
" Brake Drum-12.340" diameter
”
6K and 8K Rotor-1.03" minimum thickness
”
3.5K Rotor-.85" minimum thickness
The machined inner surface of the brake drum that contacts the
brake magnet is called the armature surface. If the armature
surface is scored or worn unevenly, it should be refaced to a 120
micro inch finish by removing not more than .030" of material. To
insure proper contact between the armature face and the magnet
face, the magnets should be replaced whenever the armature
surface is refaced and the armature surface should be refaced
whenever the magnets are replaced.
Note: It is important to protect the wheel bearing
bores from metallic chips and contamination which
result from drum turning or armature refacing
operations. Make certain that the wheel bearing
cavities are clean and free of contamination before
reinstalling bearing and seals. The presence of
these contaminants will cause premature wheel
bearing failure.
Bearing Inspection
Wash all grease and oil from the bearing cone using a suitable
solvent. Dry the bearing with a clean, lint-free cloth and inspect
each roller completely.
CAUTION
Never spin the bearing with compressed air.
THIS CAN DAMAGE THE BEARING.
If any pitting, spalling, or corrosion is present, then the bearing
must be replaced. The bearing cup inside the hub must be
inspected.
Hubs/Drums/Bearings