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 TM 5-683/NAVFAC MO-116/AFJMAN 32-1083
Table 5-1. Motor control preventive maintenance guide.
WHAT TO INSPECT
WHAT TO INSPECT FOR
Exterior and Surroundings
Dust, grease, oil; high
1.
temperature; rust and
corrosion; mechanical damage;
condition of gaskets, if any.
Interior of Enclosure,
Same as for No. 1 plus excess
2.
vibration which may have
Nuts and Bolts
loosened nuts, bolts or other
mechanical connections.
Contactors, Relays,
3.
a.
General
Check control circuit voltage;
inspect for excess heating of
parts evidenced by
discoloration of metal,
charred insulation or odor;
freedom of moving parts; dust,
grease, and corrosion; loose
connections.
b.
Contact Tips
Check for excessive pitting,
roughness, copper oxide; do
not file silver contacts.
Springs
c.
Check contact pressure; is
pressure same on all tips.
d.
Flexible leads
Look for frayed or broken
strands; be sure lead is
flexible - not brittle.
e.
Arc Chutes
Check for breaks or burning.
f.
Check for freedom of movement;
do not oil.
Coils
g.
Look for overheating, charred
insulation or mechanical
injury.
h.
Magnets
Clean faces; check shading
coil; inspect for
misalignment, bonding.
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