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hrccws

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  1. Hi, we have a 2012 Mack Granite, we just started having issues with the air compressor not building up air, after some diagnosing we found the unloader valves were sticking, we removed the head off the compressor and found the whole head was full of carbon, (this compressor was replace with new one approx. 6 months ago due to old compressor pressurising cooling system) we cleaned the head totally and replaced unloader valves and gaskets and about 2 weeks later we are getting the same thing happening, also getting a lot of crap and carbon like substance in the air tanks and filter, we have a 2011 one also which dropped a rod in the compressor a few years back but had no other issues, Mack dealer not offering any answers, has anyone had similar issues? it has a 2 cylinder Wabco compressor on it.
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