TM 5-3810-307-24-1-1
Direct/General Support Troubleshooting - Continued
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
2. Excessive water in
d. Excessive system leakage.
d. Check system for leaks and
system (continued).
repair as necessary.
e. Automatic drain valve in
e. Test operation of valve and
main supply reservoir
repair or replace as necessary.
defective.
f. Defective governor
f. Check governor for proper cut-
in pressure, cut-out pressure,
and excessive leakage in both
positions. Repair or replace
governor as necessary.
3. Safety valve on air dryer
a. Desiccant cartridge plugged.
a. Check the compressor for
popping off or exhausting
excessive oil passing, correct
air.
as necessary. Rebuild or
replace cartridge.
b. Defective discharge check
b. Test valve, refer to Symptom 1.
valve in air dryer end cover.
c. Safety valve setting lower
c. Reduce system air pressure or
than maximum system
install higher setting safety
pressure.
valve.
4. Constant exhaust of air at
a. Air dryer purge valve leaking
a. With compressor loaded, apply
air dryer purge valve or
excessively.
soap solution on purge valve
unable to build system
exhaust to test for excessive
pressure.
leakage. Repair or replace
purge valve as necessary.
b. Defective governor.
b. Check governor for proper cut-
in pressure, cut-out pressure,
and excessive leakage in both
positions. Repair or replace
governor as necessary.
c. Defective heater or
c. Test heater and thermostat.
thermostat.
repair or replace as necessary.
5. Air dryer does not purge
a. Defective governor.
a. Check governor for proper cut-
or exhaust air.
in pressure, cut-out pressure,
and excessive leakage in both
positions. Repair or replace
governor as necessary.
b. Air dryer purge valve stuck
b. Test operation of valve and
closed.
repair or replace as necessary.
1-5-17
