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TM 5-4210-220-12
Table 4-2 UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8d
EXCESSIVE OIL IN PURGE WHEN COMPRESSOR UNLOADS OR OIL IN AIR RESERVOIR
Step 1
Check engine air cleaner gage in cab
Replace air cleaner, (see para. 4-23)
Step 2
Check hose between engine and compressor for kinks or other obstruction
Replace hose, (see para. 4-9)
Step 3
Check oil return line from compressor to engine
Replace hose if kinked or obstructed, (see para. 4-28).
Step 4
Check operation of compressor
Overhaul compressor, (see para. 4-28)
8e
RESERVOIR PRESSURE FALLS MORE THAN 2 PSI/MIN (14 kPa/MIN) WHEN ENGINE STOPPED
Step 1
Check reservoir draincocks
Close/repair draincocks
Step 2
Check all valves for leaks
Replace valves, (see para. 4-22)
Step 3
Check all pressure switches on brake pedal plate for leaks
Replace switches, (see para. 4-22)
Step 4
Check purge valve on bottom of air drier
If leaking, replace purge assembly, (see para. 4-22)
Step 5
Listen for loss of air on all air lines and fittings. Check with bubble test.
Replace/remake connections or replace hose, (see para. 4-9)
8f
SERVICE BRAKES WILL NOT HOLD PRESSURE
Step 1
Check chambers for leakage
Replace as required, (see para. 4-30 or 4-32)
4-38
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