umodelnut Posted September 4, 2013 Share Posted September 4, 2013 Ok, so the U built air fine last summer before we took the cab off. Now, its not building any. But Papa thinks its building a teeny tiny bit of air because he pushed the bleeder valve on the bottom of the tank and a little bit came out. So, there is a line from the intake (from the air cleaner) that goes to the side of the compressor. We took that line off and sprayed a little PB Blaster in the screen in the compressor. Also I put a new line on and made sure nothing was plugged. That didn't work. So we thought it might be the governor. So we bought a brand new governor and put it on, that didn't work. Now Papa thinks he has everything hooked up right. Even if he did it would build air right? It would just bleed off. I need help. I like to have brakes. Thanks in advance,,,Vinny Quote Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/ Share on other sites More sharing options...
j hancock Posted September 5, 2013 Share Posted September 5, 2013 Sounds like the unloader valve might be stuck open. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203801 Share on other sites More sharing options...
umodelnut Posted September 5, 2013 Author Share Posted September 5, 2013 I remember a couple people saying something about that. How do i get into it? Any pictures? Quote Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203803 Share on other sites More sharing options...
farmer52 Posted September 5, 2013 Share Posted September 5, 2013 Try this link...http://www.bendix.com/media/documents/products_1/compressorsgovernors_1/troubleshootingguide.pdf 1 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203807 Share on other sites More sharing options...
j hancock Posted September 5, 2013 Share Posted September 5, 2013 Here is some more to add to what Ken provided. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203808 Share on other sites More sharing options...
umodelnut Posted September 5, 2013 Author Share Posted September 5, 2013 Thanks Ken. Emailed it to Papa. Quote Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203809 Share on other sites More sharing options...
umodelnut Posted September 5, 2013 Author Share Posted September 5, 2013 Here is some more to add to what Ken provided.Thanks. Will talk to Papa tomorrow. School starts tomorrow cant go back to Nana and Papas for awhile Quote Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203810 Share on other sites More sharing options...
doubleclutchinweasel Posted September 5, 2013 Share Posted September 5, 2013 I remember a couple people saying something about that. How do i get into it? Any pictures?A few shots from the service manual... 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203812 Share on other sites More sharing options...
Superdog Posted September 5, 2013 Share Posted September 5, 2013 did you take main line off compressor with the engine running to see if it was pumping air? Quote Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203855 Share on other sites More sharing options...
2stacksuperdog Posted September 5, 2013 Share Posted September 5, 2013 did you take main line off compressor with the engine running to see if it was pumping air?Thats what i told him. 1 Quote Matt Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203856 Share on other sites More sharing options...
umodelnut Posted September 5, 2013 Author Share Posted September 5, 2013 No, we'll have to play around with it. When i go back again. Papa will probably be working on it while im gone too. Quote Link to comment https://www.bigmacktrucks.com/topic/32614-u-model-not-building-air-still/#findComment-203873 Share on other sites More sharing options...
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