Medium and Heavy Trucks
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Still here pondering the vastness of the universe and wondering about Pete air rides
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We installed new "Barksdale" matching valves with internal dump capabilities. We do not have truck air bag pressure guages but the lift axles have individual pressure controls. For this load we have operated with 35 PSI on each lift axle, and at different truck ride heights, from 1" low to 1" above normal. The rocking motion is not constant but is concerning when it begins. The load stabilizes a small amount with the axles down but does not stop.
The vehicle has been axle load tested and meets the 12,000 lb. requirements for the steer axle and load parameters of all other axles.
Sorry, I apparently missed the send button at 4:15. I was at church from 4:30 till almost 7:30. We used either a pair of LV2358 or LV 2374 valves. We moved the left valve closer to the frame and mounted the right valve a proportional distance on the right frame rail with a shop built bracket.
We adjusted the ride height in 3/8-1/2 inch increments and test drove the vehicle after each adjustment. The vehicle was lower at the rear when it came in, but it is now higher (we will lower it again). The vehicle is level side to side. The vehicle was low enough to hit the u-bolts on the frame at times. The vehicle does not have towing capabilities. Even at the current height we have had no drive line vibration problems, just the side to side rock.
If you have felt a side to side rock as you leave a drive way or location and enter a road, you can imagine the slow movement. Now add that to a smooth looking road and 70 mph. You can't always see what causes the motion to start.
Thanks for the assist. Truck owner wants single valve put back and refuses to persue the problem. We could not put a finger exactly on the cure and the first effort failed so he lost confidence. We tried to get him to rebush and align rear but to no avail. Again, Thanks.