Bella69 Posted May 11, 2019 Share Posted May 11, 2019 why would back air bags be higher then front air bags Quote Link to comment Share on other sites More sharing options...
alex g Posted May 11, 2019 Share Posted May 11, 2019 You may have two leveling valves. You'll need to adjust one. Quote Link to comment Share on other sites More sharing options...
Bella69 Posted May 11, 2019 Author Share Posted May 11, 2019 only one leveling valve Quote Link to comment Share on other sites More sharing options...
JoeH Posted May 11, 2019 Share Posted May 11, 2019 What do you mean by higher? Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted May 12, 2019 Share Posted May 12, 2019 (edited) Frame pitch. Jack your front axle off the ground 5” and both tandem will have even geometry. Trust the suspension gauge to set height and never lean on visual interpretation. Edited May 12, 2019 by Mack Technician 2 Quote Link to comment Share on other sites More sharing options...
Quickfarms Posted May 12, 2019 Share Posted May 12, 2019 Did you actually measure the air bags and frame height when the truck is actually sitting on a level concrete pad?How much difference are we talking? Are you measuring the bag height from mounting surface to mounting surface?Are both rear suspensions the same?A change in components over the years could create a slight difference.What is the truck, year model? Quote Link to comment Share on other sites More sharing options...
Bella69 Posted May 13, 2019 Author Share Posted May 13, 2019 2000 ch 613 set back axle it is all mack Quote Link to comment Share on other sites More sharing options...
j hancock Posted May 14, 2019 Share Posted May 14, 2019 Get the ride heights specs from the dealer or a good truck shop using your VIN. Park it on a level surface and see what you have for heights in comparison to the factory information. Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
Mack Technician Posted May 17, 2019 Share Posted May 17, 2019 Think he is going to need the Hendrickson Chicken Gauge to set it. Google “Mack Service Bulletin SB136012”. 1 Quote Link to comment Share on other sites More sharing options...
j hancock Posted May 17, 2019 Share Posted May 17, 2019 Good call. I have nothing on air and forgot about their go/no go gauge. Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
Swishy Posted May 18, 2019 Share Posted May 18, 2019 Got more guages than a Boing 727 LOL Clikity .........................................................................ClikClikClik cya 1 1 Quote Link to comment Share on other sites More sharing options...
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