TM 55-4920-394-13&P
inherent in all inspections other than dimensional or operational inspections. If a part appears defective,
correct the defect or replace V the part at the point at which the defect is noted, before performing additional
inspections. Do not disassemble equipment merely to perform inspections of components if performance of the
equipment or component assembly is satisfactory.
3-13. Inspect All Equipment . Inspect all equipment prior to disassembly, when disassembled, and after final
reassembly for visible defects. The inspection will check tangible and visible mechanical conditions of the
equipment and its components. Pay particular attention to loose, broken or dirty connections and cracked,
chipped or broken housing, bases or mounting brackets. Check manually for positive mechanical action of
moving parts. Check for binding or rotating equipment. Inspect for freedom from dust and dirt, particularly in
air passages, and oil or grease, particularly on coils or contacts. Inspect lamps and indicators for broken
filaments, loose indicators, broken cases, or bases.
3-14. Dimensional Inspection . Where dimensional inspection is required, make measurements indicated
with standard shop measuring devices. Dimensional tolerances are not critical in most of the electrical
components, and the inspection may be ignored if visual and mechanical inspection is satisfactory and the
equipment is operating properly. Do not disassemble equipment merely to perform dimensional or operational
inspections.
3-15. Operational Inspection.
For operational inspection, tolerances and procedures, refer to
Chapter 1,
Section II and Chapter 2, Section II. Do not disassemble equipment merely to perform operational inspections.
Where operational inspection is indicated, satisfactory operation at rated specifications is generally acceptable,
and minimum and maximum performance is not critical, unless specifically called for.
3-16. Inspection Tables. Inspection procedures are tabulated for electrical parts, mechanical parts and
related groups of parts for which specific data is required. (See Tables 3-1 through 3-5.) All other parts can be
adequately inspected by visual inspection.
3-17. Component Inspection.
3-18. Motors. Inspect all motors visually for cleanliness, broken, cracked, or bent frames, end bells or shafts,
and loose or damaged contacts or leads. Watch for evidence of discoloration, spattered solder, or burned
insulation, indicative of overheating. Do not disassemble sealed bearings for inspection. If bearings are badly
discolored due to overheating, or if oxidized (red) dust indicates lack of lubrication, replace the bearings. Use a
tachometer to check motor rpm under specified power supply.
3-4