Brake System Maintenance Instructions (Cont)
Inspection and Repair.
DO NOT grind or sand painted equipment without high efficiency air
purifying respirators in use.
Some hubs have three bosses added during manufacture that can interfere
with installation of bolt together wheels. If replacing a split rim wheel,
inspect the hub for any bosses that might interfere with the installation of
the bolt together wheel.
Axles no. 1 and no. 2 on all vehicles and all axles on the M984A1 are not
On rear tandem axles of all models, except the M984A1, the brake drum
may have a boss of different widths or the same width.
If the width of two bosses on the drum are different, no rework is required.
If all three bosses are the same size, grind approximately 1/2 in. (12.7 mm)
chamfer off of boss leaving 1/8 in. (3.2 mm) of the boss.