66rmack Posted December 7, 2016 Share Posted December 7, 2016 On my 89 superliner. When I first went and looked at it. It built air psi. But when it got delivered, it wouldn't build any at all. Nothing has changed. I cracked a line and you can hear air but it's not much. So I guess I wondering is there a check valve or a governer on the compressor? I know freightliners have a governer that if it goes out it won't build air. I'm not familiar with the systems. I may have looked right at it and didn't notice one. Thanks in advance for any insite. Quote Link to comment https://www.bigmacktrucks.com/topic/47914-air-psi-problems/ Share on other sites More sharing options...
terry Posted December 7, 2016 Share Posted December 7, 2016 Are all the air tank drains shut? Quote Link to comment https://www.bigmacktrucks.com/topic/47914-air-psi-problems/#findComment-354212 Share on other sites More sharing options...
66rmack Posted December 7, 2016 Author Share Posted December 7, 2016 1 hour ago, terry said: Are all the air tank drains shut? Yep they are. I had to check twice. Quote Link to comment https://www.bigmacktrucks.com/topic/47914-air-psi-problems/#findComment-354225 Share on other sites More sharing options...
gearhead204 Posted December 7, 2016 Share Posted December 7, 2016 they have 4....just double checking drivers side 1 on air tank under batt. box 2 on pass. side air tank under batt. box and one on the frame rail behind the trans on the drivers side. the air governor is on the fire wall passenger side. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/47914-air-psi-problems/#findComment-354228 Share on other sites More sharing options...
66rmack Posted December 7, 2016 Author Share Posted December 7, 2016 8 minutes ago, gearhead204 said: they have 4....just double checking drivers side 1 on air tank under batt. box 2 on pass. side air tank under batt. box and one on the frame rail behind the trans on the drivers side. the air governor is on the fire wall passenger side. Thank you! I'll check it out. I'm starting to get to know semi's I have a lot to learn! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/47914-air-psi-problems/#findComment-354230 Share on other sites More sharing options...
BC Mack Posted December 7, 2016 Share Posted December 7, 2016 air brake systems need to be understood before you delve into trying to fix problems shotgun style... and you need to know how to pre-trip your truck correctly even if you haven't got a CDL or equivalent... here is some good bedtime reading, or in your favourite place of solitude ;-) BC Mack Bendix Air Brake Handbook[1].pdf air brake problem finder.pdf tractor_air_brake_troubleshooting_guide[1].pdf 1 Quote Link to comment https://www.bigmacktrucks.com/topic/47914-air-psi-problems/#findComment-354244 Share on other sites More sharing options...
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