TM 5-4220-225-14Table 2-3. Daily Predive Procedures (Cont).StepProcedurec.Locking Device Assembly Inspection.NOTEApply only enough lubricant to coat item concernedwithout excess.(1)Ensure locking pins are in good condition and operate freely.Check that detent balls operate properly. Apply a light film oflubricant to locking pins.(2)Inspect locking pins for corrosion, bends or cracks.(3)Inspect helmet lugs for corrosion, dents, and loose or damagedmounting screws.d.Exhaust Valve Inspection.(1)Check exhaust valve in accordance with applicable procedurebelow.(2)Lay helmet assembly on its right side with exhaust valve facingup.e.Adjustable Exhaust Valve Check.NOTEIf handle is loose, tighten friction drag screws untildesired action is achieved.(1)Rotate valve handle.Motion should be firm and have someresistance but operate smoothly through full range, approxi-mately three turns.(2)Depress the chin button with finger pressure. Motion should besmooth with spring pressure increasing steadily. Upon releasingfinger pressure, valve should shut with spring tension.f.Ambient Exhaust Valve Check.(1)Remove exhaust valve cover and inspect valve body for dirt,corrosion, and damage.Inspect diffuser for dirt or damage.Replace or clean parts as necessary.2-32
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