Drycleaning solvent Fed. Spec. P-D680 is potentially
dangerous. Avoid repeated and prolonged breathing of vapors
and skin contact. Do not use near open flame, arcing equipment
or other ignition sources. Always wear protective clothing and
(2) Clean dust and dirt from fan fins, rotor fins, inside fan cover, and both end plates with solvent Fed.
Spec. P-D-680, and air dry.
(3) Blow out any remaining dust and dirt.
(4) Clean non-electrical metal components with solvent Fed. Spec. P-D-680.
(5) Air dry all parts
(1) Check metal parts, particularly cooling fan and rotor shaft, for signs of wear.
(2) Record damage for later repair.
(3) In motor casing, check coils and leads for damage to insulation and wires. Check for signs of
overheated coils, deteriorated coil end bindings, and missing or broken coil retainer strips.
(4) Check ball bearings for flat spots or lateral play.
(5) Inspect wavy washer for damage.
e. Component Tests.
(1) Using multimeter set to resistance scale, make resistance, short, and ground checks on motor casing
coils. (Refer to schematic, figure 11 2.)
(2) If coils do not test properly, send motor to next higher level of maintenance.
f. Repair or Replace.
(1) Replace all gaskets, seals, and O-rings.
(2) Replace all damaged nuts, bolts, screws, washers, and wavy washers.
(3) Replace damaged, worn, or unserviceable ball bearing assemblies.