TM 10-6640-239-13 5-6 5-6. WATER TANK. This task consists of: a.   Remove b.   Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Materials/Parts Required Teflon Tape, (Appendix E, Section II, Item 139) Flange Gasket, (Appendix E, Section II, Item 50) Lockwashers (8) Personnel Required Two (2) Equipment Conditions Water Pump Removed (Paragraph 5-5). General Safety Instructions WARNING ELECTRICAL SHOCK Before performing any  maintenance actions on electrical equipment, ensure  all electrical power has been turned off.  Failure to comply with this warning may result in serious injury or death. REMOVE Remove Water Tank.  See Figure 5-2. a. Open drain valve (1) at bottom of water tank (2).  Allow water to drain from tank and system plumbing. b. Disconnect three unions (3) and water flow direction valve (4) from top of water tank (2). c. Disconnect two unions (5) and switch (6) from top of water tank (2). d. Disconnect union (7) at overflow drain line. e. Disconnect two unions (8) at water return lines. f. Disconnect union (9) on suction line from water pump. g. Disconnect drain line union (10). h. Remove six screws (11), nuts (12), lockwashers (13), washers (14), and gasket (15) from tee flange (16).  Discard gasket and lockwashers. i. Remove two screws (17), nuts (18), lockwashers (19), and washers (20) from each tank support leg (21).  Discard lockwashers. j. Disconnect unions and remove any obstructing plumbing as required. k. Remove water tank (2). l. Remove pipe fittings from water tank (2). m.    Remove drain valve (1) and tee (22) from water tank (2).