TM 5-3805-261-34
BRAKES TROUBLESHOOTING AND MAINTENANCE PROCEDURES.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
a.
AIR COMPRESSOR PASSES EXCESSIVE OIL, INDICATED BY OIL SEEPING FROM AIR STRAINER. (cont)
Step 4.
Check for poor compressor cooling (compressor runs hot). Check coolant flow and temperature through
compressor. Install suitable flow meter and temperature gage between compressor coolant outlet and
engine block (Figure 6-1). Start engine. Flow through compressor should be at least 2.5 gpm. Coolant
temperature should not exceed 200 degrees F. Stop engine.
If flow is not at least 2.5 gpm, check coolant lines and fittings for scales, kinks or restrictions. If coolant
temperature exceeds 200 degrees F., refer to Cooling System Troubleshooting.
Step 5. Check air system reservoir for build-up of dirt and water.
Drain reservoir. Refer to TM 5-3805-261-10.
Step 6. Check if air compressor runs loaded an excessive amount of time. Measure air system leakage. Install
suitable air pressure gage in air system (Figure 6-1). Start engine and let air pressure build up and
stabilize. Observe air pressure gage. System leakage should not exceed 1 psi pressure drop per minute
without brakes applied and 3 psi pressure drop with brakes applied. If leakage is excessive, look for
system leaks. Stop engine.
Repair system leaks, if necessary. Refer to paragraphs 6-9 and 6-11.
Figure 6-1.
6-3
