TM-5-4310-389-14
CHAPTER 5
GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
Section I.
GENERAL SUPPORT TROUBLESHOOTING
5-1 GENERAL SUPPORT TROUBLESHOOTING PROCEDURES . This section contains general support
troubleshooting procedures as authorized by Maintenance Allocation Chart (MAC).
Table 5-1. General Support Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
COMPRESSOR
1.
Sight glass exhibits air bubbles.
Step 1.
Check to see if 4th stage outlet valve is defective.
Replace outlet valve.
2.
Compressor does not attain final pressure.
Step 1.
Check to see if there is excessive piston clearance.
Replace.
3.
Final pressure safety valve blows off with no or minimum air delivery from the tap.
Step 1.
Check to see if pressure regulating valve is adjusted too high or is stuck.
Dismantle pressure regulating valve and clean valve.
Step 2.
Check to see if non-return valve is corroded.
Clean if possible or replace.
Step 3.
Check to see if no air is coming through to filling tap.
Clean the sintered filter before the filling tap must be cleaned or exchanged.
Step 4.
Check to see if final pressure safety valve is defective.
Repair or replace, if necessary.
4.
Compressor air delivery is insufficient.
Step 1.
Check to see if intake/discharge valve of 1st stage is malfunctioning.
Replace or repair, as required.
Step 2.
Check the intake/discharge valves of 2nd, 3rd, or 4th stage if intermediate pressure of any stage
is too high.
Examine intake/exhaust valves of 2nd, 3rd, and 4th stage, respectively; repair, as required.
Step 3.
Intermediate pressure is too low, there is leakage in the piping system, automatic condensate
drain system, or in the start without loading system.
Locate and repair leak.
5-1
