TM9-2330-372-14&P
NOTE
If brake drums have been machined (para. 5-5), install shims between the brake shoe and brake
lining, of the same thickness as the metal removed from the brake drums.
d. Install rivets (8) in the two center holes of the brake shoe (4) and brake lining (2) to secure the brake lining, then
install the remaining rivets.
e. Install the other lining (2).
f. Check the contact of the brake lining with the brake shoe. A 0.0005-inch feeler gage should not enter between
the brake shoe and brake lining at any point.
g. Repeat steps c through f for remaining brake shoes.
h. Check shoes against drum for contact. Brake shoes must have 80 percent contact between lining and drum
surface. It is necessary that the contact be in the middle of the lining surface and continuous. If lining to drum surface
contact is not 80 percent, the shoes should be circle ground to comply.
5-5. TURNING DRUMS.
a. Clean brake drum with cleaning solvent to remove dirt and grease.
b. Inspect the brake drum for warpage, cracks, scored braking surface, and out-of-round condition. If inspection
shows the brake drum to be in unsatisfactory condition, refinish the brake drum in the following manner:
(1) Measure the inside diameter of the brake drum. New brake drums measure 16.490 to 16.510 inches. Brake
drums should be refinished if scoring or run-out exceeds 0.0006 inch.
NOTE
Brake drums having an inside diameter larger than 16.650 inches must be replaced.
(2) Install brake drum on lathe and refinish surface, taking off as little of the metal as possible to true the
surface. If refinishing requires removal of more than 0.070 inches of metal (0.140 inch in diameter), replace the brake
drum.
(3) Finish inside diameter to 200 microinches.
5-2
