TM 5-4610-223-12 Table 3-1.  Operator/Crew Preventive Maintenance Checks and Services NOTE: Within designated interval, these checks are to be performed in the order listed. B - Before A - After M - Monthly D - During W - Weekly C - Combat Operability Check Interval Item to be Procedures Equipment will Item Inspected Check for and have repaired be reported Not No. B D A W M C or adjusted as necessary. Ready (Red) if: 1 Chemical Proper adjustment is a Slurry deflection of 1/2 to 1 inch Feeder midway between pulleys. Drive Belt 2 Erdlator Proper adjustment is a Agitator deflection of 1 inch midway Drive Belt between pulleys. 3 Erdlator Inspect tank for dirt and Tank foreign matter.  Clean a dirty tank. 4 Wet Well Inspect tank for accumula- Tank tions of dirt and foreign matter. Clean a dirty tank. 5 Sludge Inspect tank for dirt and Concentra- foreign matter.  Clean a tion Tank dirty tank. 6 Raw Water Inspect glass for dirty con- Sightglass dition.  Clean a dirty sight- glass. 7 Waste Water With grating removed, Tank inspect tank for accumula- tions of dirt and foreign matter.  Clean a dirty tank. 8 Diatomite Inspect filter elements Filters through filter window for evidence of dirt, foreign matter, or damage.  Clean dirty elements. 3-6