TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Troubleshooting Symptoms Charts
Section TS - Troubleshooting Symptoms
Page TS-11
Air Compressor Will Not Stop Pumping
This is symptom tree T010.
Cause
Correction
Block the vehicle wheels and check the air
system for leaks with spring brakes applied
and released. Check for leaks from the air
Air system leaks
.......
compressor gaskets and the air system hoses,
fittings, and valves. Refer to Procedure 012-019
and the OEM service manual.
OK
A
Check the air governor for correct operation.
Make sure the air governor is located less than
2 feet from the air compressor. Refer to the
ir governor is malfunctioning
.......
Master Repair Manual, Holset Air Compres-
sors, Bulletin No. 3666121.
OK
U
Check the unloader valve and unloader body
seal. Refer to the Master Repair Manual,
nloader valve is malfunctioning
.......
Holset Air Compressors, Bulletin No.
3666121.
OK
A
ir governor signal line or actuator line is
Inspect the signal line and actuator line. Refer
.......
to the OEM service manual.
plugged
OK
A
Check the operation of check valves, alcohol
evaporators, air dryers, and other OEM-
ir system component is malfunctioning
.......
installed air system components. Refer to the
OEM service manual.
OK
A
Inspect the air compressor intake and exhaust
valve assemblies. Refer to the Master Repair
ir compressor intake or exhaust valve leaks
.......
Manual, Holset Air Compressors, Bulletin No.
air
3666121.
L-595
