Vacuum Motor Brush Replacement - MAGUIRE NOVATEC VL Series Instruction Manual

Once each cartridge is cleaned, completely dry and inspected, it may be re-installed onto the
filter mounting plate in the same fashion it was removed. Examine the filter mounting plate
to be sure it is intact and its perimeter seal is smooth and clean since it will form a vacuum
tight seal between the motor lid, the filter mounting plate and the loader body. Replace the
seal if it is not in perfect shape.
Once filter cartridge(s) are mounted to the filter mounting
plate, it may be reinstalled by placing it on the flat rim of
the loader body with the cartridges down inside the
loader body. At this point, it is critical that each
cartridge filter is located directly below a blowback
nozzle that cleans it during the blowback sequence
(this step not required for single cartridge units). By
viewing the motor lid and the blowback nozzles on the
underside of it, the filter plate may be rotated into
proper position prior to placing the motor lid down upon
it and centering the filter between the two. Each blow
down jet on the lid must be centered over a cartridge
filter for effective blowback action. Replace the clamp
and tighten. With newly installed filter plate seals, the clamp may need to be adjusted to
provide a vacuum-tight and mechanically firm seal.

11.3- VACUUM MOTOR BRUSH REPLACEMENT

Brushes should be examined for wear and changed before the brush holder or non-brush
components touch the commutator of the motor. Estimated brush life is approximately 300
running hours under normal operating conditions. See next page for detailed brush
changing instructions. To achieve best performance, new brushes should be seated on the
commutator before full voltage is applied. The motor manufacturer recommends the
following procedure:
After brush change, apply 50% to 70% of rated voltage for thirty minutes to accomplish the
seating. The motor will return to full performance after thirty to forty-five minutes of operating
at full rated voltage. The motor must not be run with the vacuum inlet sealed off.
Direct application of full rated voltage after changing brushes will cause arcing, commutator
pitting, and reduced overall life. However, if reduced voltage is unavailable; connecting two
motors of similar rating in series for thirty minutes will accomplish the proper brush seating.
CAUTION: Disconnect electrical power before any type of loader maintenance.
Removing the vacuum motor from the loader lid is recommended prior to changing brushes.
VL-VLP IM 19 JUNE 2017 © 2017 NOVATEC, Inc. All Rights Reserved
IMPORTANT: Make sure that
each blow down jet on the lid must
be centered over a cartridge filter
for effective blowback action.
Cartridge Filters (3)
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