TM 10-6640-238-13 5-44 5-21.    GUM BATH VENT/FUME VENT BLOWER AND MOTOR. This task consists of: a.   Remove b.   Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Portable Electric Drill, (Appendix B, Section III, Item 2) Twist Drill Set, (Appendix B, Section III, Item 2) Hand Blind Riveter, (Appendix B, Section III, Item 3) Materials/Parts Required Lockwashers, (4) Rivets (6) 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 Gum Bath Vent/Fume Vent Blower and Motor.  See Figure 5-17. a. At Power Panel No. 2, set circuit breaker A15CB11 OFF. b. Remove access panel from blower motor junction box (1).  Tag and disconnect wiring and conduit (2). c. Loosen clamp (3) and disconnect discharge duct (4) from blower housing (5). d. Remove four nuts (6), eight washers (7), four dampers (8), and screws (9) securing motor bracket (10) to equipment shelf (11). e. Loosen clamp (12) on suction duct (13) and remove blower motor (14) and motor bracket (10) from equipment shelf (11). f. Remove four screws (15), eight washers (16), four lockwashers (17), nuts (18), and blower motor (14) from motor bracket (10).  Discard lockwashers. g. Remove three rivets (19) and reducer (20) from blower housing (5). INSTALL Install Gum Bath Vent/Fume Vent Blower and Motor.  See Figure 5-17. a. Install reducer (20) and secure with three rivets (19). b. Position blower motor (14) on motor bracket (10) and secure with four screws (15), eight washers (16), four lockwashers (17), and nuts (18). c. Place blower motor (14) and motor bracket (10) on equipment shelf (11) and secure suction duct (13) to blower housing (5) by tightening clamp (12).