4-9. GENERAL MAINTENANCE PROCEDURES- Continued
g. Solvent Spray Gun.
Spray gun must be used in a spray booth with filter and face
shield for personnel since dry cleaning solvent (Item 3,
Appendix E) is toxic to skin, eyes and lungs. Avoid prolonged or
h. Hot Water/Steamer. Radiator cores should be cleaned with steam or hot water. If sediment with the core
cannot be completely removed in this way, core will have to be boiled in a chemical bath. This bath is a
strong solution of caustic soda and is available in a radiator repair shop.
i. Pressure Wash. Painted surfaces (e.g., truck body) shall be cleaned with a detergent solution and a
pressure washer. Always rinse surface with clean water.
Although the truck body paint is very durable, certain solvents may damage the paint. Keep solvents
away from painted surfaces. A pressure washer should be used to remove excessive road dirt, oil, and
grease from exterior parts prior to dismantling.
j. Steam Cleaning. Oil and fuel tanks should be flushed with steam for at least 24 hours before welding or
maintaining such tanks.
k. Ball and Roller Bearings. When cleaning ball or roller bearings, place them in a basket. Suspend the
basket in a dry-cleaning solvent, (Item 3, Appendix E) preferably overnight. if needed, use a brush to
remove caked grease or chips. Avoid rotating the bearings until all solid particles are removed. When
bearings are clean, spin them in a light lubricating oil (Item 10, Appendix E) to remove solvent.
I. Rubber Parts. Do not clean performed packings or other rubber parts in solvent. These parts should be
wiped with a clean, dry, lint-free cloth (Item 42, Appendix E).,
m. Electrical Components. 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 (Item 42,
Appendix E). If necessary, moisten cloth with dry-cleaning solvent (Item 10, Appendix E).
n. Complex Components. 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 3, Appendix E).