TomKat Posted August 1, 2013 Share Posted August 1, 2013 Hey- I have a 95 CH 613, it sits around a lot (used on a farm to haul grain). Sometime the air pumps up too high....and sometime the air wont pump at all and looses pressure. I don't understand how the system works so i am having a hard time diagnosing the problem. It has been noticed on a couple occasions in the past year, today it quit pumping up altogether. What part do I need to change, I am not a mechanic , but can change parts like nobodies business. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/32164-sometimes-loose-psi-sometimes-too-much/ Share on other sites More sharing options...
Freightrain Posted August 2, 2013 Share Posted August 2, 2013 Welcome to the forums.Governor bad? Kinda like your shop compressor it tells it when to pump.It reads pressure in system, when it gets to preset number it pushes on unloader valve(so the pump just spins free). Once the pressure drops it kicks it back in again. Typically when a governor goes bad gives you those symptoms.We're talking a $15 part at local truck parts store. Just replaced mine on the B a few months ago. It was getting erratic and sometimes only getting to 60# of pressure.Looks like this: Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/32164-sometimes-loose-psi-sometimes-too-much/#findComment-197405 Share on other sites More sharing options...
thomastractorsvc Posted August 2, 2013 Share Posted August 2, 2013 Let me be the second one to welcome youDitto what he said Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/32164-sometimes-loose-psi-sometimes-too-much/#findComment-197407 Share on other sites More sharing options...
slpwlker Posted August 2, 2013 Share Posted August 2, 2013 Welcome to the jungle Quote Link to comment https://www.bigmacktrucks.com/topic/32164-sometimes-loose-psi-sometimes-too-much/#findComment-197410 Share on other sites More sharing options...
TomKat Posted August 2, 2013 Author Share Posted August 2, 2013 Thanks for the advice, will give it a try today. Quote Link to comment https://www.bigmacktrucks.com/topic/32164-sometimes-loose-psi-sometimes-too-much/#findComment-197442 Share on other sites More sharing options...
TomKat Posted August 3, 2013 Author Share Posted August 3, 2013 Thanks for the advice, will give it a try today.Yeah, that fixed it ......the Dog is back to barking!Thanks again Quote Link to comment https://www.bigmacktrucks.com/topic/32164-sometimes-loose-psi-sometimes-too-much/#findComment-197640 Share on other sites More sharing options...
Freightrain Posted August 21, 2013 Share Posted August 21, 2013 Glad to hear back that it was fixed. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/32164-sometimes-loose-psi-sometimes-too-much/#findComment-200944 Share on other sites More sharing options...
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