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Old 06-09-2019, 07:03 PM   #1
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No air pressure!

Hi all,
2000 BB all american with 0 air pressure! Bus sat for a week and the air bags went low - which is normal for this bus. But when I started it today it runs awesome but built no air pressure. Let it run for an hour and nothing. Never had this problem before. Suggestions on diagnosing this problem? I gotta move the beast!
Andy
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Old 06-09-2019, 07:15 PM   #2
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Is the belt still on the compressor?
If compressor is running as it should, you should hear air escaping if any hose/line was compromised or airbag suddenly "let go". You may need to get underneath and listen for leakage.

Compressor output test is in order if nothing above checks out faulty...
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Old 06-09-2019, 07:24 PM   #3
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Gotcha, dumb question: is the compressor driven from a belt on the engine? Its a cummins isc
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Old 06-09-2019, 07:41 PM   #4
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Yes. It probably has a tag with "Bendix" on it...
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Old 06-09-2019, 08:10 PM   #5
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Silly question, but have you checked to make sure the tank valves are closed? If someone emptied the water and didnít close them back it seems like this could happen.
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Old 06-09-2019, 08:21 PM   #6
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Diagnosis time. There's 3 likely causes.


1. Air compressor isn't turning. Check belts/gears.
2. Air compressor is turning but not generating airflow. Check "governor" and related controls. This is also a symptom of a failed compressor but these things are pretty robust, so don't jump to the conclusion without being sure.

3. Air compressor is turning, generating airflow, but air system is not holding. Follow sounds of air hissing to determine where it's coming out.


In your case, if you are getting ZERO pressure, focus on 1 and 2. In case 3, you'll usually get *something* on the air gauge, even if it's only 20-30 PSI. If you're hearing air hissing, skip steps 1 and 2, since you're getting airflow from the compressor.
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Old 06-11-2019, 05:19 PM   #7
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Ok thanks for all the info. The tanks are closed.
I dont know where the air compressor is? On the engine it looks like: 2 ac comps, alt, ps pump, water pump, fuel pump. Am I missing it?
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Old 06-11-2019, 05:34 PM   #8
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If it isn't top R engine, I'm wondering what those 2 idle pulleys, lower L, are for...
(BTW, thanx a big ol' steamin' pile full for the crick in my neck!)
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Old 06-11-2019, 06:13 PM   #9
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They are for the rear a.c. which isnt working. Haven't tried to figure out why.
(Sorry! Pic didn't look like that when I loaded it...)
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Old 06-11-2019, 06:25 PM   #10
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The air compressor is gear driven.
Its behind the timing cover on the lower right side.
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