WS 4900 Dump Airliner Susp DS rear bag not inflating unloaded

Do you have a 4 bag suspension? Not counting the 3 ride. If it’s 4 bag and you get pressure in front bag and not the back , line plugged or crossed to that bag. Pull the supply line to that bag see if you getting any flow. Older rodgers rgns have levelers on each side , this is to help level the load if loaded to one side, and I think that is the set up of what you have. That works great if they are in “ tune” if not one will be set just a little lower or higher than the other. I’ve adjusted and adjusted , just enough to say that I moved it , little too much or not enough. BTW you’ll need to dump the bags after each adjustment as if completely down ,then see if it’s correct after airing up. Had them right for several weeks then - bingo ,out again. After pulling your hair out, you can go to plan B . If the loads are petty well center side to side , use one leveler and tie all the bags together . Done that on rgn tri axles and have no problem .