IGV Posted December 4, 2023 Share Posted December 4, 2023 How you all doing gentlemen, I have a 2006 mack granite cv713 And primary air pressure is going up to 140 psi and secondary is at the right pressure I already changed the governor but it didn't get it fixed does anyone have an idea what could be it, thanks in advance Quote Link to comment https://www.bigmacktrucks.com/topic/73606-air-pressure/ Share on other sites More sharing options...
mechohaulic Posted December 4, 2023 Share Posted December 4, 2023 '06 way too new for me . based on being around for the dual system when first came out and what the brain can remember;; I would consider the gauge might be off. where does is rest if system completely drained?? governor wouldn't segregate between primary/ secondary. wouldn't think check valve .if newer systems feed primary first then secondary then entire system may be at 140 , cut off valve should discharge. I go with fault gauge first. Quote Link to comment https://www.bigmacktrucks.com/topic/73606-air-pressure/#findComment-542881 Share on other sites More sharing options...
IGV Posted December 4, 2023 Author Share Posted December 4, 2023 Thank you very much sir I appreciate your response, I will check the gauge then because when the air tanks are drained the primary gauge stays at around 15 20 psi and the secondary completely drains to 0 psi Quote Link to comment https://www.bigmacktrucks.com/topic/73606-air-pressure/#findComment-542885 Share on other sites More sharing options...
mechohaulic Posted December 5, 2023 Share Posted December 5, 2023 drained system with primary gauge showing 15-20 psi ;; did you tap gauge ; it should drop to 0. it does then build air back both systems should register same . primary jumps back to 15-20 off replace it. could be technical and put a good working gauge on primary tank it self to verify before buying parts . JUST REMEMBER TO DRAIN PRIMARY COMPLETELY BEFORE REMOVING ANY PLUGS 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73606-air-pressure/#findComment-542925 Share on other sites More sharing options...
Joey Mack Posted December 5, 2023 Share Posted December 5, 2023 1 minute ago, mechohaulic said: drained system with primary gauge showing 15-20 psi ;; did you tap gauge ; it should drop to 0. it does then build air back both systems should register same . primary jumps back to 15-20 off replace it. could be technical and put a good working gauge on primary tank it self to verify before buying parts . JUST REMEMBER TO DRAIN PRIMARY COMPLETELY BEFORE REMOVING ANY PLUGS Yep,,,,, Quote Link to comment https://www.bigmacktrucks.com/topic/73606-air-pressure/#findComment-542926 Share on other sites More sharing options...
mechohaulic Posted December 5, 2023 Share Posted December 5, 2023 forgot to question :: do the '06's have the one gauge with dual needles =red/green ?????? I'm thinking old school two gauges not the modern "crap" gauges . have seen many dual needle gauges screw up. if you are the main driver knowing primary needle is off 15-20 on a positive side and relief valve isn't blowing off== I'd run it ; not a hazard. Quote Link to comment https://www.bigmacktrucks.com/topic/73606-air-pressure/#findComment-542927 Share on other sites More sharing options...
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