Ladybug1969 Posted November 16, 2020 Share Posted November 16, 2020 (edited) 01 CH MODEL. I've started having a few air related issues. The most frustrating is the leveling of the air bags. The leveling/ height adjustment valve is plumbed with 1 input line, 1 line out to front rear, 1 line to back rear, and exhaust(no dump) . I've recently begun having an issue with the right side not leveling with the left and even worse, giving a severe drop under a load. Enough that I've been concerned of a rollover while being loaded(log truck). With it plumbed front and back, not side to side, what the heck could be causing my right side not to hold up? New leveling valve btw. I haven't checked to see what the pressure is going into leveling valve with a gauge. I do know I can't hold it with my thumb over the line if that means anything. There's a valve(rectangle with a red pop off(?) that the input line runs to at the tank. Is this a pressure protection valve? It wasn't bypassing that I could tell. Any ideas would be appreciated Edited November 16, 2020 by Ladybug1969 Quote Link to comment https://www.bigmacktrucks.com/topic/64944-air-bag-leveling-issue/ Share on other sites More sharing options...
hatcity Posted November 16, 2020 Share Posted November 16, 2020 Is leveling valve adjusted properly? Check air bag mounts May have a leaking bag Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/64944-air-bag-leveling-issue/#findComment-463921 Share on other sites More sharing options...
Ladybug1969 Posted November 16, 2020 Author Share Posted November 16, 2020 Valve/ height was adjusted. I've not found any leaks on bags Quote Link to comment https://www.bigmacktrucks.com/topic/64944-air-bag-leveling-issue/#findComment-463925 Share on other sites More sharing options...
hatcity Posted November 16, 2020 Share Posted November 16, 2020 Was thinking some more on this Check entire spring system....had same problem and found the “Z bar” was broke Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/64944-air-bag-leveling-issue/#findComment-463927 Share on other sites More sharing options...
Freightrain Posted December 3, 2020 Share Posted December 3, 2020 I wonder if there is check valves between sides to keep them up. If not, if you lean too hard on one side it could push the air into the opposite side bags causing a severe list. How does the line split when it reaches each rearend? Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/64944-air-bag-leveling-issue/#findComment-464826 Share on other sites More sharing options...
Mark T Posted December 3, 2020 Share Posted December 3, 2020 If it was ok then started doing this ? It's not the air. Spring(s) or saddles and blocks are worn out. Quote Link to comment https://www.bigmacktrucks.com/topic/64944-air-bag-leveling-issue/#findComment-464828 Share on other sites More sharing options...
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