I have a 2016 cascadia daycab twin screw. Whenever I hit the dump switch, drop a trailer, and pull out, my power axle (front) will spin the tires. It seems as if the rear bags have more air. I’ve already adjusted the ride height to factory spec. Also I believe this is causing a rough ride over bumps.
Air dump/ rough ride
Discussion in 'Trucks [ Eighteen Wheelers ]' started by jthomsonmusic, Oct 1, 2019.
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First thing if you have a true normal twin screw tractor, not just one live axle with a dummy axle, you don't have a power axle. With the power divider unlocked which ever tire with the least traction will spin, could be front or back left or right. With the power divider locked one wheel on the front and rear axle will spin. Could be either side. It doesn't criss cross or anything, which ever wheel with the least traction will spin.
Now you said with the dump valve dumped it seems like the rear bags have more air in them? That shouldn't be with the bags dumped. Dump the air and tap on your bags with your hand. The should all be soft..
If you are having problems spinning while pulling out from under a trailer lock your power divider in or don't dump your bagsSwine hauler, x1Heavy and pushbroom Thank this. -
lester is right. The driving axle will spin unless the power divider is locked. Next time, pull away from the pin, then drop the air.
x1Heavy Thanks this. -
wait a bit for the bags to fill some.
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I believe I understand now. Thanks for the reply. I just checked my bags after a long drive and I have more air in the rear bags compared to the front. I’m at factory spec ride height. I’ve also tried lowering the height and raising it. Same result. What could be causing the back bags to over inflate? A stuck check valve?
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Swine hauler, x1Heavy and pushbroom Thank this.
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Oxbow and BoxCarKidd Thank this.
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Follow the lines, maybe quick release valve is dickered. Could also have some protection valve to keep air tank from emptying if you blow a bag. Make sure there is only one leveling valve too. You could make a pressure gauge to temporarily T into the line and verify pressure is different at each bag. Just guessing don't take what I say as gospel
Oxbow Thanks this. -
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