Drycleaning solvent Fed. Spec. PD680 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 loose dust and dirt from fan fins, rotor fins, inside fan cover, and both end plates with cleaning
solvent Fed. Spec. PD680 and air dry.
(3) Blow out any remaining dust and dirt.
(4) Clean non-electrical metal components, including bearings, with cleaning solvent Fed. Spec.
(5) Air dry parts.
(6) Wrap dry bearings in a soft, clean, lintless cloth.
(1) Check metal parts, particularly cooling fans and rotor shaft, for signs of wear.
(2) Record damage for later repair.
(3) Check motor casing coils and leads for damage to insulation and wires. Check for signs of overheated
coils, deteriorated coilend bindings and lashings, and missing or broken coil retainer strips.
(4) Check ball bearings for flat spots or lateral play.
(5) Inspect centrifugal mechanism for broken parts or excessive wear.
(6) Inspect stationary switch for damage, particularly burned or pitted contacts.
f. Component Tests.
(1) Using a multimeter, make short and ground checks on motor casing coils. (Refer to schematic, figure
(2) If coils do not test properly, send motor casing to next higher level of maintenance.
(3) If coils are functional and no damage was noted on bearings or fans, send rotor shaft to next higher
level of maintenance for disposition.