Copy of this Lubrication Order will remain with the equipment at all times; instructions contained therein are mandatory and supersede all conflicting lubrication Instructions dated prior to =5 MAY 1944= By order of the Secretary of War: G. C. Marshall, Chief of Staff. Official: J. A. Ulio, Major General, The Adjutant General.] Section XIII LUBRICATION 49. LUBRICATION. _a. Gun group._ War Department Lubrication Order No. 4001 (Fig 31) shows the parts which require lubrication, the lubricants, and the intervals. (1) _Lubricants._ Grease, general purpose, No. 1 is used, except for temperatures below freezing, when grease, general purpose. No. 0 is used. The bearing surfaces should be lightly coated with the grease. (2) _Frequency of lubrication._ The surfaces of the ignition-head body which touch the spring case should be lubricated after each use of the weapon. Other parts are lubricated after six firing missions, six training sessions, or oftener. All should be thoroughly cleaned (Pars 52, 55, and 56) with gasoline, dry cleaning solvent, or other solvent, then dried before lubrication. If the gun is disassembled for any other reason, it should be lubricated before reassembly. (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). 51. BEFORE-OPERATION SERVICE OF TANK GROUP. The following services are to be performed before filling, charging, and loading the flame thrower with pressure, fuel, and ignition cylinder: _a. Pressure-tank valve._ Open and close pressure-tank valve to test for ease of operation. _b. Threaded connections._ Check all threaded connections for tightness, using appropriate wrenches.