Troubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Section TS - Troubleshooting Symptoms
Air Compressor Will Not Pump Air
This is symptom tree T009.
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.
Replace the desiccant cartridge on the air
ir dryer desiccant cartridge is saturated
dryer. Refer to the OEM service manual.
Check the unloader valve and unloader body
seal. Refer to the Master Repair Manual,
nloader valve is malfunctioning
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.
plined drive coupling or gear is excessively
Check the coupling for wear. Refer to Proce-
Inspect the air compressor intake and exhaust
valve assemblies. Refer to the Master Repair
ir compressor intake or exhaust valve leaks
Replace or rebuild the air compressor. Refer to
ir compressor is excessively worn or internally
the Master Repair Manual, Holset Air Com-
pressors, Bulletin No. 3666121.