TM 5-4220-225-14Table 4-1. Unit Troubleshooting Procedures (Cont).MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION8. REDUCED AIR FLOW.Step 1. Check console pressure.Adjust console pressure to proper level.Step 2. Visually inspect the hose for kinks.Remove any kink.Step 3. Inspect air hose for damage.Replace or repair damaged hose (para. 4-30).Step 4. Inspect the filter screen for clogging.Inspect the entire air supply system to determine the source of the foreignmaterial.Step 5. Inspect the one way valve for clogging.Replace one way valve (para. 4-19).Step 6. Inspect the air supply tubing assembly for clogging.Clean and reinstall or replace the air supply tubing assembly (para. 4-20).Step 7. Inspect the air supply valve for clogging.Clean or replace the air supply valve (para. 4-21) and retest the helmet assemblyflow P (para. 2-8).Step 8. Check air supply diffuser for clogs.Clean or replace air supply diffuser (para. 4-22).Step 9. Check air supply valve.Remove the handle valve packing gland nut and valve stem. Inspect the valvestem and valve seat for damage. Reinstall or replace the valve assembly or valvestem as required (para. 4-21).4-7
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