CHAPTER 4. INTERMEDIATE DIRECT SUPPORT
SECTION I. TROUBLESHOOTING
ENGINE. Intermediate direct support troubleshooting and maintenance instructions for the gas engine are
contained in TM 2805-257-14. Repair parts are listed in TM 5-2805-257-24P.
AIR PUMP. Intermediate Direct support troubleshooting and maintenance procedures cover gasket replacement.
Any maintenance beyond this level is only authorized to be performed by special repair activity.
TROUBLESHOOTING CHART. The following columns are used in the Table 4-1, Troubleshooting.
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. Where the corrective action is
too complicated to be listed in full detail, the paragraph number of the detailed procedure is given in parentheses.
Table 4-1. Troubleshooting
TEST OR INSPECTION
Refer to TM 5-2805-257-14 and TM 5-2805-257-24P.
1. LOSS OF OIL.
Step 1. Check for gear oil or bearing grease on impellers. Oil or grease indicates worn bearing seals. Replace
air pump. Refer to paragraph 3-19.
Step 2. Check for oil leak in gear cover gasket. Replace gasket. Refer to paragraph 4-4.
2. EXCESSIVE PUMP TEMPERATURE.
Step 1. Check position of coupling caps. Remove coupling caps and attach hose(s). Refer to paragraph 3-16.
Step 2. Check for clogged exhaust manifold. Remove clog. Refer to paragraph 3-16.
Step 3. Check for improperly functioning safety valve. Replace safety valve, if necessary.