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What is causing this annoying vibration/shake?

I am stumped. I have a vibration that seems be more of a slow shake between about 38 and 47 mph. No worse loaded or empty and the only way to overcome it is to quickly accelerate past that point. I think it is coming from the right front but at this point dont really know. I ruled out a tire because it didnt do it and I stopped to eat and when I took back off it was doing it so no damage to my new (5000 miles) 16 ply tires. I then thought wheel bearing so I checked for metal in the oilers but just oil with no metal. There have been no repairs and nothing has been ran over such as curbs etc.

Answer this question I have this problem too

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7 Answers

Most Helpful Answer

Maybe a wheel weight fell off. You say the tires are only 5,000 miles old so it could be a wheel weight problem. Have them re-balanced, and watch the tire as it goes around on the balance machine to see if there might be an out of round problem.

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There is a line that goes around the tire that is about a 1/4" from the wheel that called a beauty line. Find this line and look at it all the way around the tire to make sure there are no dips or low places where this line gets closer to the wheel. Sometimes when mounting a tire if they don't lubricate it good enough the mounting bead will stick and not mount properly causing the tire to be out of round and since you have just installed this could be something to look at. If you find this problem just have them knock the tire down and remount it. ''italic text''

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I had a set of Firestones once with Centramatics, the right front tire kept going. After a few tire changes I finally had the tires spun up on a dynamic wheel balancer and found out it was the left tire that was out over 30 ounces, which was too much for the Centramatics to compensate for. So if you have your balance checked make sure they spin up the wheels on a balancing machine and not one of those static bubble balancers.

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Check to see if your tractor is pulling to the right at that speed range, because often a king pin issue, balance issue or improperly mounted tire will cause this type of vibration.

When my tractor started doing this, I had it taken to a shop with a big, fancy rack. They said "king pin." Then just last week, I had it taken into a shop with the MD Alignment ProTrak System and an experienced mechanic. The mechanic checked the bearing end play, re-tightened a bearing and adjusted a king pin shim on the right hand side. He also checked the wheel balance, suspension settings and alignment, and then had me test drive the truck to make sure the problem was fixed.

I am very happy with my truck right now. I just need someone to turn off the oven outside of my truck!

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Do you feel it in the steering wheel? If so probably a toe setting. As you accelerate toe will go from toe in to straight (with correct setting). With too little toe in it goes to toe out and the steering will hunt until speed takes over.

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One of our drivers had a similar vibration. His turned out to be a warped brake drum.

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I think you are all missing the point that the problem started after going into a parking lot. No problem before parking then problem started after getting back on the road.

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Comments:

That's right- it often will start in a parking lot because the parking lot is filled with crater-sized pot holes that mess up tire belts, king pins, bushings, suspension components and bearings as well as alignment and the driver's patience.

Get the truck checked ASAP by a competent mechanic using MD Alignment's ProTrak System and make sure your truck gets back to normal. Also, stop flying through rough parking lots!

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Gary Lynch will be eternally grateful.
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