TM 5-4310-389-14
CHAPTER 4
DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
Section I.
DIRECT SUPPORT TROUBLESHOOTING
4-1 DIRECT SUPPORT TROUBLESHOOTING PROCEDURES. This section contains direct support troubleshooting
procedures as authorized by the maintenance allocation chart (MAC).
Table 4-1. Direct Support Troubleshooting Procedures
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
COMPRESSOR
1
Compressor will not load.
Step 1.
Check stage safety valves.
Check cartridges in purifiers.
2.
Compressor output low.
Step 1.
Check compressor rpm for rated speed.
Step 2.
Perform intermediate stage pressure check.
3.
Low compressor oil pressure.
Step 1.
Check oil pressure regulator for proper setting.
Adjust, repair, or replace as needed.
4.
Compressor air has oily taste.
Step 1.
Check cartridge evaporation date.
Replace.
Step 2.
Check oil pressure regulator to high.
Adjust.
5.
Sight glass exhibits air bubbles.
Step 1.
Check oil pressure regulator.
Clean and adjust regulator.
Step 2.
Check oil pump final pressure.
Clean or replace.
Step 3.
Check 4th stage piston clearance.
Replace as necessary.
4-1
