TM 9-2320-364-20-3 2-2186 1.  AIR PRESSURE BUILDUP IS SLOW (CONT). 2. Are purge valves on air dryers and aftercooler free of leaks or damage? Replace purge valve(s) (Para 12-21 and 12-22). Verify repair, go to Step 9 of this Fault. YES NO Air cleaner OK. Air dryer filters OK. Coalescing filter OK. Aftercooler filter OK. Drain valves OK. Leaking air dryer and   aftercooler purge valves. Restricted air compressor inlet   air line. Leaking or restricted   compressor discharge air line. Leaking check valves. Damaged air compressor. Damaged air governor. Air dryer or aftercooler check   valves faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Visual inspection. Audible inspection. Air pressure buildup will be slow if air is continually leaking from air dryer or aftercooler purge valves. 3. Is air line 2600 free of damage, crimps or leaks and are fittings free of leaks? Tighten loose fittings or replace air line 2600 (Para 12-36 and schematic Fig 2-50). Verify repair, go to Step 9 of this Fault. YES NO Air cleaner OK. Air dryer filters OK. Coalescing filter OK. Aftercooler filter OK. Drain valves OK. Air dryer and aftercooler purge   valves OK. Restricted air compressor inlet   air line. Leaking or restricted   compressor discharge air line. Leaking check valves. Damaged air compressor. Damaged air governor. Air dryer or aftercooler check   valves faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Visual inspection. Audible inspection. Air will not flow freely to air compressor if air compressor inlet air line 2600 is leaking, crimped or damaged. WARNING WARNING Read   WARNING on Page 2-2187 Read   WARNING on Page 2-2187