TM 5-4220-225-14Table 2-2. Mission Predive Setup Procedure (Cont).StepProcedureNOTEIf handle is loose, tighten the friction drag screwsuntil the desired action is achieved.(12) Rotate valve handle.Motion should be firm and have someresistance but operate smoothly through full range,approximately three turns.(13) Depress the chin button with finger pressure. Motion should besmooth with spring pressure increasing steadily. Upon releasingfinger pressure, the valve should shut with spring tension.d.Ambient Exhaust Valve Check.(1)Remove the adjustable exhaust valve cover and inspect thevalve body for dirt, corrosion, and damage. Inspect the diffuserfor dirt or damage.Replace or clean parts as necessary(2)Remove the diaphragm retainer and inspect the diaphragm fordamage and deterioration.(3)Apply a light film of lubricant to the bead of the diaphragm andinstall the diaphragm and ambient diaphragm retainer. Ensurethe diaphragm seats properly.(4)Install the ambient exhaust valve cover.e.Air Adapter Assembly Check.(1)Remove the air adapter cap and filter screen. Inspect theadapter, screen, and cap for dirt, corrosion, and damage.Ensure the nonreturn valve is properly installed. (Do not removethe valve unless it is suspect.) Reinstall screen.(2)Visually inspect for loose or missing screws. Tighten or replaceas required.f.Air Supply Whip.(1)Remove the protective caps from the air supply whip andinspect the air supply whip fittings for corrosion and damage.Inspect the gasket for wear or deterioration and lubricate lightlywith an approved lubricant.Replace the gasket if required.(2)Install the whip to the helmet air adapter. Ensure it is right.2-29
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