TM 10-6640-239-13 4-77 4-35.    AIR TANK. This task consists of: a. Remove b. Install c. Test INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Personnel Required Two (2) 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 NOTE Before removing air tank purge by opening any system valve. Remove Air Tank.  See Figure 4-23. a. Set switch on compressor controller to OFF and open circuit breaker A15CB8 on Power Panel No. 2. b. Open pressure switch (1) then, tag and disconnect wires. c. Remove conduit nut from inside of pressure switch (1) and remove conduit (2) and wires from pressure switch. d. Disconnect air hose (3) on side of air tank (4) from discharge side of air compressor. e. Disconnect air outlet hose (5) at top if air tank (4). f. Disconnect drain line (6) at bottom of air tank (4). g. Remove three screws (7), washers (8), and air tank (4) from foundation (9). h. Remove air purge (10), air outlet valve (11), air gauge (12), pressure switch (1) and drain valve (13), tubing and fittings from air tank (4).