TM 10-6640-238-13 4-83 4-37.    VACUUM SYSTEM COMPONENTS. 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) Materials/Parts Required Teflon Tape, (Appendix E, Section II, Item 157) 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 1. Remove Vacuum Pump.  See Figure 4-26. a. Set switch on vacuum pump controller (1) to stop. b. Open circuit breaker A15CB9 on Power Panel No. 2. c. Remove cover from controller (1), tag and disconnect motor leads. d. Loosen conduit nut inside controller (1) and remove conduit (2) and wires. e. Disconnect discharge line (3) on vacuum pump (4) at discharge valve (5). f. Loosen hose clamp (6) and disconnect suction hose (7) from vacuum pump (4). g. Loosen hose clamp (8) and disconnect drain line (9) from vacuum pump (4). h. Remove five screws (10), ten washers (11), and five nuts (12) that secure foundation of vacuum pump (4) to mechanical room wall foundation. i. Remove vacuum pump (4) from mechanical room wall foundation. j. Remove conduit (2) from vacuum pump motor. 2. Remove Flow Control Devices.  See Figure 4-24. Remove laboratory stopcock valves (1) by unscrewing valves from tees and elbows located in the vacuum system mounted to the laboratory walls. 3. Remove System Piping.  See Figure 4-25. a. Remove sections of system piping (1) by locating nearest pipe union (2) and threaded pipe fittings. b. Disconnect union (2). c. Disconnect pipe nipple from elbow (3), coupling (4) or valve (5). d. If damaged section of piping (1) contains brazed joints or union (2) refer to direct support maintenance.