TM 5-4310-384-13
CHAPTER 4. INTERMEDIATE DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
SECTION I. TROUBLESHOOTING
4-1.GENERAL. This section contains troubleshooting procedures to be performed by Intermediate Direct Support
maintenance. This assumes that troubleshooting and maintenance procedures have already been performed at the unit
level for similar malfunctions. Information should be reviewed in Chapter 3: Unit Maintenance Instructions; Section V.
Troubleshooting; and Section VI. Unit Maintenance Procedures.
4-2.COMPRESSOR UNIT. Intermediate Direct Support troubleshooting and maintenance procedures cover cylinder and
crankcase component replacement: cylinder block, pistons, connecting rod assemblies, crankshaft, and oil seals.
4-3.ELECTRIC MOTOR. Intermediate Direct Support troubleshooting and maintenance procedures cover motor
component replacement.
4-4.TROUBLESHOOTING TABLE. The following columns are used in the Troubleshooting Table.
a.
Malfunctions. Malfunctions listed are the ones most likely to happen. Not all possible malfunctions can be
foreseen and listed.
b.
Test or Inspection. Tests or inspections are listed to help you find the cause of the malfunction. The tests that
are easiest to do are listed first. The tests that are hardest to do are listed last.
c.
Corrective Action. Corrective actions are listed to help eliminate the malfunction. The paragraph number of the
detailed maintenance procedure is given in parentheses.
Table 4-1. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
COMPRESSOR
1.
COMPRESSOR DOES NOT PUT OUT ENOUGH AIR.
Step 1. Check for leaking gaskets between cylinder heads and cylinders, and gaskets between cylinders and
crankcase.
Install new gaskets (paragraph 4-7).
Step 2. Check for worn or damaged intake or exhaust valves in low pressure cylinder. Replace as necessary.
2.
EXCESSIVE OIL CONSUMPTION.
Step 1. Check for worn or stuck piston rings, particularly oil ring. Install new piston rings (paragraph 4-7).
Step 2. Check for leaking gasket between cylinder and crankcase, leaking gaskets between crankcase and
crankcase cover, or leaking gasket between crankcase cover and breather assembly cover.
Install new gaskets (paragraph 4-7).
4-1
