Kenmorth T600 straight truck, tandem axle, air ride rear, spring fronts.
Air system has two leveling valves for rear system.
When loaded truck rocks side to side when traveling.
Is it possible these valves are ‘fighting against each other’?
While its rocking, it is not like it gradually leans over than gradually comes back, it like it leans, then hits a point than quickly snaps back to level, then gradually leans the other way, then hit a point then snaps back again, rinse repeat.
Rocking suspension
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Lazer, Oct 18, 2020.
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Generally dual levelling valves are much more stable than the single valve setups.
I have come across this issue before on another truck. Dual leveling valves but one was replaced with the wrong valve. One was more sensitive than the other, so the sensitive side dumped/filled the bags on that side much more rapidly. Swapped it out so they both matched and it was all good.Dino soar and spsauerland Thank this. -
Leveling valves should be for axle not for side. Check if some mechanic messed up it.
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Dino soar, p608, spsauerland and 1 other person Thank this.
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Kenworth used them on trucks early to mid 2000s and i am sure others. They were most common on the 8 bag suspensions. I removed one valve on the ones that i could not get to work right for long and ran the valve on LFD. It may have been intended to stabilize cornering but i have no idea.
Snailexpress Thanks this. -
Yes, this is a 2006. Actually and thankfully 90% of the fleet is pre-def, pre-regen. 100% manual transmissions.
This particular truck has a 4300 gal, single compartment tank on it. So with natural rock, and surges with hauling liquids having leveling valve not working proper adds to the excitement. -
Lazer said: ↑Yes, this is a 2006. Actually and thankfully 90% of the fleet is pre-def, pre-regen. 100% manual transmissions.
This particular truck has a 4300 gal, single compartment tank on it. So with natural rock, and surges with hauling liquids having leveling valve not working proper adds to the excitement.Click to expand... -
AModelCat said: ↑A levelling valve for each side is actually a legitimate factory option from most manufacturers. Typically found on trucks that run off pavement often. Very rare to see on a highway spec truck.Click to expand...
Does it improve traction? -
Dino soar said: ↑What is the effect of that?
Does it improve traction?Click to expand...
With a single valve, the truck will lean if its loaded heavy on one side. With dual valves, the heavy side will get more pressure in order to keep the frame level.baha, pushbroom, swaan and 1 other person Thank this.
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