TM 10-6640-239-13 3-17 3-6. ELECTRIC STILL. This task consists of: a. Remove b. Service c. Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Materials/Parts Required Lockwashers, (5) 10% Acidic Acid 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 Distilled Water Container.  See Figure 3-3. a. Remove retaining strap (1) and remove container (2) from still shelf by lifting up container and tilting bottom out and down to clear tube (3). 2. Remove Still. a. Remove still’s power cord from convenience outlet. b. Loosen clamp (4) and remove drain hose (5) from elbow (6). c. Loosen clamp (7) and remove supply hose (8) from still (9). d. Remove five screws (10), lockwashers (11), and washers (12) securing retaining ring (13) and still (9).  Discard lockwashers. e. Lift still (9) and retaining ring (13) from still shelf.  Drain residual water from still. f. Remove elbow (6) from still (9). g. Remove retaining ring (13) from still (9). SERVICE Clean Still. a. Remove three thumb nuts (14) and remove lid (15) from still (9). b. Remove any loose scale or residue from still (9) by blowing out with low pressure (20 psi) air. c. Clean still’s interior with a solution of 10% acidic acid to remove any buildup of scale. d. Rinse with fresh water, dry interior and exterior thoroughly.