Warner Electric Wheel-Brakes (Std) - Manual (Page 20)

20 Warner Electric • 800-825-9050 819-0514
It is important that magnets and armatures be used
in pairs (Figure 3-14), both from a wear pattern
standpoint and for proper electrical characteristics.
Therefore, during repair and maintenance periods,
never interchange magnets and armatures. When
new magnets and armatures are to be replaced,
either individually or in pairs, make certain that proper
electrical characteristics will be obtained. Thus, either
the magnet or armature must have an air gap in order
to insure proper brake release. If both magnet and
armature have an air gap, weak brakes will result.
Always order replacement parts by the number
stamped on the armature retainer ring or the magnet
nameplate.
Check the magnet bushing for damage or excessive
wear. A new bushing is approximately 1/16” thick and
should not be used when worn below 1/32”. Worn
bushings may be removed by driving a “prick punch”
between magnet and bushing. Install new bushing by
placing the magnet face down on a clean, smooth
surface and pressing the bushing into the magnet 1/4”
below the level of the magnet surface facing you.
Remove any rough edges with a bearing scraper.
If, during the amperage check at each wheel a
defective magnet was indicated, the magnet leads,
backing plate terminals, and backing plate terminal
block should be inspected. Defective parts should be
replaced and all connections cleaned and tightened. If
the trouble is not readily apparent, remove the magnet
for further checking.
Testing Magnet
Figure 3-15
Testing Amperage Capacity of Magnet
Figure 3-14,
Types of Magnets and Armatures
Non-Air Gap Magnet Air Gap Magnet
Air Gap Armature Non-Air Gap Armature