The preventive maintenance checklist (para 320) is a summary of the
basic maintenance operations that are necessary and the intervals at which
they should occur. Routine beforeoperational and afteroperational
inspection of Washer EK1 should become habitual with the operator. A check
of the motor and the cylinder driving mechanism should be made while the
washer is in motion. Cleanliness of the washer is essential.
Every three days, the cylinder must be lifted from the tank for
thorough cleaning. Simply lift the cylinder straight up and out of the
tank. Flush out the tank to remove iron scale and slivers. See that the
supply line is free of scale and foreign material. Then lower the cylinder
onto the wooden bearings in the lift channels. Repeat the flushing.
318 Chemical Deposits, General
Once a week, wash the cylinder and the inside of the tank with a clean
cloth, saturated with soap solution. Swab off any chemical deposits; rub
vigorously if necessary. Then flush out the tank and cylinder.
319 Heavy Chemical Deposits
Where deposits of iron, rust, and other impurities have become heavy,
special solutions must be used for removal. A 10percent solution of sodium
nitrate sprinkled with whiting compound may be used as a cleaner. On
unpainted stainless steel surfaces, a 2 to 5percent solution of oxalic
acid should be used. Moisten a clean cloth with solution and rub vigorously
over contaminated areas. If necessary, use a fiber brush to scrub the
surface. Never use a wire brush or steel wool to clean the cylinder or
tank. The tank and cylinder should be washed with one of these solutions
every three months as a preventive maintenance service. Never use oxalic
acid solution on painted surfaces because it will remove the paint.