2-8. Cleaning

2-8. Cleaning. TM 5-4940-228-14 CAUTION At the end of each day, or when a job is com- pleted, clean spray equipment as follows: a. Open slide valve on pressure (paint) tank by pushing it back (toward fluid pressure air regu- lator) (Fig. 2-3). Wait until fluid pressure air gage reads “0”. b. Obstruct nozzle of spray gun with a rag and pull trigger. The spraying pressure will thus force paint out of black fluid hose and back into the pres- sure tank. c. Remove pressure (paint) tank control head as- sembly (Fig. 4-2, Item 1) and pour remaining paint from insert pail (Fig, 4-2, Item 5) back into your original paint container. d. Clean insert pail thoroughly with applicable paint thinner. Pour a small quantity of thinner into the insert pail, place pail in tank and replace control head assembly. e. Close slide valve and adjust fluid pressure air regulator for about 10 psi as indicated on the fluid pressure air gage. f. Remove air nozzle from spray gun and spray into a waste solvent container, Fluid pressure will force thinner through black fluid hose and spray gun, cleaning it satisfactorily. g. Again, open slide valve, obstruct nozzle and pull trigger to blow thinner back into insert pail. WARNING Do not soak respirators in paint thin- ner. Most paint thinners can cause skin irritations and could cause seri- ous illness if inhaled. Do not soak hoses in thinner, air and outer fluid hose material is resistive to thinners but can become un- serviceable if soaked. NOTE It is not necessary to disconnect spray gun from red air hose or to remove black fluid hose or to take spray gun apart when cleaning. h. Stop engine by moving RUN/OFF switch to OFF. i. If equipment will not be used within 24 hours, remove the black fluid hose and hang it up to drain, connections facing down. j. Tighten the spray gun packing nuts period- ically. If leaks do not stop, replace packing (Fig. 4- 1). k. Use a rag moistened with paint thinner to wipe the exterior of all spray equipment. l. Clean respirators after each use as follows (Fig. 2-5): (1) Remove cartridges, prefilters and head- bands. (2) Mix a mild liquid dishwashing detergent with warm water in a container large enough to ac- cept facepiece. (3) Cleanse facepiece by immersing in solu- tion and swabbing until clean. (4) Rinse in clean warm water and air dry. (5) Inspect exhalation valve and exhalation valve seat carefully to be sure both are clean, smooth and free of foreign particles or dirt. 2-9. Perform The Necessary Preventive Main- tenance Services (Refer to Chapter 3, Pre- ventive Maintenance Checks And Services). Section II. OPERATION UNDER UNUSUAL CONDITIONS 2-10. Operation in Extreme Cold. b. Fill the gasoline tank at the end of each day’s a. Select the correct lubricants for the expected operation to prevent condensation of moisture. air temperatures as indicated on the Lubrication c. Where possible, install the equipment in a Order (Refer to Chapter 3). properly protected shelter. Be certain to pipe ex- haust to outside of building. 2-11