TM 5-2420-230-24-2
Troubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Page TS-10
Section TS - Troubleshooting Symptoms
Air Compressor Will Not Pump Air
This is symptom tree T009.
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
Replace the desiccant cartridge on the air
ir dryer desiccant cartridge is saturated
.......
dryer. Refer to the OEM service manual.
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
Check the air governor for correct operation.
Make sure the air governor is located less than
ir governor is malfunctioning
.......
2 feet from the air compressor. Refer to the
Master Repair Manual, Holset Air Compres-
sors, Bulletin No. 3666121.
OK
S
plined drive coupling or gear is excessively
Check the coupling for wear. Refer to Proce-
.......
worn
dure 012-014.
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.
OK
A
Replace or rebuild the air compressor. Refer to
ir compressor is excessively worn or internally
.......
the Master Repair Manual, Holset Air Com-
damaged
pressors, Bulletin No. 3666121.
L-594