Warner Electric Wheel-Brakes (Std) - Manual (Page 17)

17 Warner Electric • 800-825-9050 819-0514
When brakes are relined, but the drum is not turned;
the ridge left on the bell end of the drum, due to drum
wear on the drum braking surface, should be removed.
This may be accomplished by turning or by using a
hand grinder (Figure 3-10) with a flexible disc.
Figure 3-10
Removing Ridge on Drum
Check Magnet And Armature
Make certain that proper magnet and armature
relationship is being maintained. That is, the magnet
poles should always be in contact with the armature
(metal to metal). This is initially accomplished by
undercutting the magnet facing .005 to .007” below
the magnet poles (Figure 3-11) at the factory. This
insures that the magnet poles will be fully seated in
their armature tracks before the magnet facing comes
into contact with the armature. Normally the magnet
pole tracks in the armature should be only slightly
wider than the magnet poles. If excessively wide tracks
are present on the armature, a loose drum or loose
wheel bearings are usually at fault.
Figure 3-11
Cross Section of Magnet and Armature
Brake Size Brake Shoe Dia.
Replacement Lining Thickness Tolerances
Standard Oversize
12-1/4 x 5-1/2”
11.442 0.385 —
11.450 0.400 —
15 x 3
14.300 0.325 —
14.310 0.330 —
16 x 2-1/2
15.4370 0.265 —
15.4375 0.275 —
16-1/2 x 5, 6, 7
15.682 0.390 —
15.692 0.400 —
17-1/4 x 3, 4, 5
16.370 0.385 —
16.375 0.405 —
Table III - Drum Rebore and Brake Reline Tolerances
Magnet Shell
Magnet Facing
Magnet Poles
Armature
Undercut .005” to .007”