4-9. GENERAL MAINTENANCE PROCEDURES - Continued
Do not clean preformed packings or other rubber parts in solvent. These parts should be wiped with a clean, dry,
Electrical components (e g coils, switches) which use insulating materials shall not be soaked or sprayed with
cleaning solutions. Remove dirt with a clean, dry, lint-free cloth. If necessary, moisten cloth with dry cleaning
solvent (item 10, Appendix E).
Components that consist of a fabrication with passages and cavities should be checked thoroughly after cleaning.
A thin flexible wire should be run through all passages to ensure they are not blocked individual passages may be
cleaned using a pressure spray gun and dry cleaning solvent (item 10, Appendix E).
4-9.3 General Inspection Instructions.
Check all contact surfaces of gaskets, packings, or seals. Ensure there are no nicks, burrs, or scratches. These
might damage new seals during assembly if any defect is found, correct it as outlined in para. 4-9.4 following.
Ball and Roller Bearings
Check bearings for pitted balls, races, or separator. Bearings shall be rejected if any of the following are seen in
the race load area.
Cuts or grooves parallel to ball or roller rotation
Fatigue pits (not minor machine marks or scratches)
Cracks found during magnetic particle inspection
Serious abrasion of balls or rollers
Serious discoloration of any part of the bearing
When removing drain plugs from transmission, engine, or axles, inspect the plug. A build-up of grit and/or fine
metal particles may indicate part failure. A few fine particles are normal.
Tubing and Hoses
Check all hose surfaces for broken or frayed fabric. Check for breaks or weak points due to kinking or rubbing
inspect metal tube lines for kinks or excessive corrosion. Inspect fitting threads or clamps for damage. Replace
any faulty part. After assembly, check all disturbed joints for leaks.