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run out on back hubs

Does anyone know how much run out you should have on your back hubs on a kenworth mine shakes and I done everything I no to do thanks

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Thanks I done it all from damper to new drive shaft , to new clutch , flywheel had it lined up , new front springs have centeramatics on every axle even king pin bushings just to make sure ,ill look for that book , I also put a new engine it 2 years ago all balanced rods piston and pins this has been night mare I have two figure this out thanks

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First question: Where is the vibration/shaking occurring? The seat will often vibrate if a problem is going on with the carrier bearing (if you don't know what that is, it's the bearing directly under the floor pan that holds the drive shaft). A u-joint problem might also be a factor... look for evidence of burn marks on the u-joint. Rough roads can also cause this, especially in cold weather when the tires, suspension components and air bags aren't as pliable as they are in warmer weather.

The steering wheel will vibrate if a steer tire is flat (low on air), or if a king pin or front suspension component is failing. Typically this will also be accompanied by a pull to one side (and it's almost always to the right in the USA and Canada or to the left in Australia).

Finally, there's the floor board vibration (which is even more severe and is not only felt in the floor, but also in the seat of the pants). This is the shaking you are describing. Run out or low tire pressure can cause this, but a bad crankshaft damper, an out-of-balance drive shaft or a bad u-joint can cause this as well.

Run out should be as close to Zero (minimal) as possible, as measured with a radial run out gauge. You might also have a technician check the balance of all the drive line components and check your ride height and the condition of the entire suspension system.

This could also be an engine-induced vibration. If it is, it's usually due to a worn out crank shaft or a failed crank shaft damper. To check for an engine vibration, you will need the vehicle stopped, the transmission in neutral and the parking brake set. Once you have done that, gradually raise the RPM of the engine. If the vehicle shakes heavily, you have a problem. If it does not shake, then you can go back to checking anything else that can cause a vibration. I hope you get your problem solved soon.

You might want to check out the handbooks from MD Alignment so you can more easily diagnose your problem. Those have been a great help to me. "A Common Man's Guide to Wheel Alignment" and "Common Sense for the Common Man" are the titles of the handbooks.

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Thanks I done it all from damper to new drive shaft , to new clutch , flywheel had it lined up , new front springs have centeramatics on every axle even king pin bushings just to make sure ,ill look for that book , I also put a new engine it 2 years ago all balanced rods piston and pins this has been night mare I have two figure this out thanks

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I had a vibration I couldn't get rid of either. Like you I went through all the same steps without fixing the problem. My vibration felt like a tire being out of round. I remounted all my tires using the true balance centering sleeves and then checked each tire with a radial run out gauge. everything was below 20 thousandths. which is just fine. I took off with the truck and it had fixed nothing. After more than a year of messing around I measured the radial run out of the drums. My rear drums (single axle tractor) were more than 50,000 thousandths out of round. What had happened is the hubs were wore so much that it was imposable to keep the drum centered. The tire could be centered with the sleeves but the drum would ride off center. I replaced the hubs, and the drums too because the insides were wore uneven from being out of round. Drove the truck, end of problem. I'm not sure what the acceptable run out range for the hubs is. I did measure the run out of the drums after I changed the hub and is was almost dead 0. It's easy to measure the run out of the drum. If its off really bad, chances are your hub is wore. I would try it and see what you come up with. I hope this helps, I know I was very frustrated with this for a long time.

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2016 volvo vnl rear drive shaft out of PHASE. anybody have this problem. came from factor this way dealer to STUPID TO FIX IT

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