TM 10-4930-236-13&P OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES B - Before D - During A - After W - Weekly M - Monthly INTERVAL PROCEDURES EQUIPMENT IS ITEM ITEM TO BE CHECK FOR  AND HAVE REPAIRED NOT READY/ NO B D   A W M INSPECTED OR ADJUST AS NECESSARY AVAILABLE IF: 16 * * * Tank Assembly Visual inspection to check for damage or Evidence of signs of leakage. Check for proper leakage or operation of bottom loading valve. Refer bottom to higher level of maintenance for repair loading valve or replacement of defective parts. will not open. 17 * * Manhole Check for damage and proper location Evidence of of manhole cover gasket, and secure fuel leakage manhole latches.  Check the location of exists. vent valve under handle, close to hinge. Refer to next higher level of maintenance for repairs. 18 * * * Coupling Half Check for signs of leakage around the Evidence of valve handle shah. Check coupling leakage. gasket for cracks. Inspect coupling for secure connection. Test coupling half by observing the internal valve mechanism as the handle is moved to ensure handle operates valve. Refer to next higher level of maintenance for repairs or replacement if necessary. 19 * * Grounding Rod Check for missing or damaged ground Ground rod rod. missing. 2-11