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 TM 5-683/NAVFAC MO-116/AFJMAN 32-1083
a.
b.
Figure 4-16. Poor Commutator Conditions: a) "Threading", b) "Streaking".
air. These fumes quickly change the mass into an
to exceed 30 psi. Greater pressure may loosen the
insulation and blow dirt under it. If blowing or
active destructive agent and a conductor of leakage
vacuuming will not remove accumulated dirt, use
currents. Moisture preventive measures are simple
solvents as recommended by the motor manufact-
and therefore will not be discussed in detail. How-
urer.
ever, close attention to good housekeeping methods
is necessary. Open-type motors should not be ex-
c. Moisture. Moisture soaks into and softens
posed to intrusion of water from drip or splatter.
winding insulation until it is no longer adequate as
..
Standby motors should be run for a short time at
an insulator. When moisture gets inside a motor, it
least once a week to guard against moisture conden-
unites with dirt to form a sticky mass. This mass
sation during periods of idleness. Before using an
absorbs acid fumes and alkali fumes present in the
4-21
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