(3) Records. To ascertain when six missions have been fired, a record of firing ([Par 2]) should be kept with each flame thrower.
b. Tank group. The tank group ordinarily requires no lubrication. However, it may under the following exceptional circumstances:
(1) If the tank group has been immersed in water for several hours, the flexible shaft of the pressure valve may have lost its lubricant. If so, remove the shaft ([Par 66 b]) and inspect. If lubricant is not present, as indicated by difficulty of movement after removal, dip the shaft in solvent to clean and then dip in warmed grease, general purpose, No. 1. Replace shaft in valve.
(2) If filling or safety-head plugs (Figs [39] and [40]) tend to stick to fuel tanks, apply grease, general purpose, No. 1 (No. 0 if below freezing temperatures) before replacing plugs.
Section XIV PREVENTIVE MAINTENANCE SERVICES
50. GENERAL
Preventive maintenance services, as prescribed by Army Regulations, are a function of using organization echelons of maintenance. These services consist of:
a. Before, during, and after operation services performed by the firers and assistants.
b. Scheduled services performed by organizational maintenance personnel (service when filling and charging, and service after six firing missions).