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Old 02-04-2013, 08:13 AM   #15
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Had the same problem 60-65 on a newly purchased 2004 40' Winnie Vectra. Got a name of a good shop in Coburg,OR (don't recall name but I can find it if you are in the area). After describing the problem the first thing he asked me was if I had beads in the tires. Spin balancing with weights fixed it immediately. Former owner got the run around for over a year judging from his maintenance records. I know the frustration. Hope this helps. Lloyd
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Old 02-04-2013, 08:16 AM   #16
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Btw, forgot to add that they had to remove all the beads first. I am not a believer in any kind a bead balancing now. Cost about $125 as I recall.
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Old 02-04-2013, 08:18 AM   #17
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I had a similar problem after my MH sat for a few months while trying to sell it. A guy came out to take it for a test drive and as he got it up to 60 it shook almost violently. It turns out it was a hung up caliper on the front. Didnt pull like you would think it would but once the rotor got hot it got worse and with a slight warp in the rotor it started to shake.
Easily fixed with a brake job but lost the sale as it scared the he!! out of the buyer.
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Old 02-04-2013, 08:24 AM   #18
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Great question, btw. While I'm new to RV experience, I really like those 2 "have it spin balanced" comments. Balancing a tire just to a wheel alone doesn't seem like it's going far enough since there's so much weight involved, but that's just me thinking out loud. Good luck and make sure you share the solution if/when you find it.
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Old 02-04-2013, 09:50 AM   #19
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You might want to check out the CHF
Cheap Handling Fix
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Old 02-05-2013, 08:23 PM   #20
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Still Shaking - Update

I took the motorhome to a tire serive center that specializes in large vechiles, (dump trucks, 18 wheelers, motorhomes, etc.). They removed and balanced each tires and checked the tires for roundness. All six tires balanced with adding only a few ounces to each tire. The motorhome was placed on jack stands, the rear tires were spun in low gear. The mechanics watched for any abnormalities and saw nothing. So, I took it to a drive train specialist who checked the drive train, ie drive shafts, U-joins, rear end, etc. Note, there are three drive shafts. which balanced / checked out ok. We took it for a test drive and he stated it was the tire(s) or a bad rim. I explained to him the tires balanced and the balancing machine also checked for out of round. It was suggested to have someone ride along side while traveling down the interstate and watch each tire to see if one jumps up and down. I will be checking this on Thursday with a mechanic to see if he can spot anything. In addition, I have an appointment next week to take it to another mechanic that works on the braking system and front ends. The tires are 19.5' Road Masters made by Cooper tire company. The tire service center which I purchased the tires has agreed to replace the tires to see if it will make a difference. In addition. I was told it could be a bad rotor. The coach has front and rear disk brakes. As I slow down, I am not feeling any bumping in the brake petal, therefore I'm suspecting that it is not a rotor problem. Additionally, I got to coach up to about 75mph, put it in neutral and the shaking returned (around 65mph) as the coach slowed down . This is driving me crazy and I'm about at my witz end. What could I be missing? Does anyone know something else I should be looking for or have any suggestions? Thank you in advance.
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Old 02-06-2013, 09:44 AM   #21
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Only other thing I can think to check, would be shocks. A worn or broken shock can give you a vibration once the wheel starts hopping around. Also a wornout stabilizer steering shock will allow vibration to be more prevelant in the steering wheel.
Very odd that it seems to be only at a particular speed though. Really makes me lean more toward a tire or universal joint in the driveshaft linkage. IMO
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Old 02-08-2013, 10:14 AM   #22
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Smile

Right front tire was out of round on our MH and we were experiencing the same vibration. Had both drive tires trued and re-balanced and took care of the problem.
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Old 03-31-2013, 06:47 AM   #23
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Quote:
Originally Posted by rtootle View Post
I have a 35' 2003 Allegro motorhome sitting on a workhorse chassis. I purchased it second hand. When I hit speeds of 60-65 the coach shakes and I can feel it in the sterring wheel. It rides smooth at 55 and around 70mph it smooths out. I have replaced all six tires and they all balanced, taking only minimum weights. I had the drive shafts checked and balanced. The ball joints and steering has been checked by a mechanic. Someone told me it could be a bent axle. With out going to another mechanic, is there a way to determine if the axle or axle plate is bent? It's driving me crazy since I normally drive around 60mph. Does anyone have any suggestions?
Thanks in advance.
Please update us when you find the problem, as I am having a similar shaking at 55+ with my 2004 32' fleetwood on a workhorse w22 chassis. Mine started after having new tires installed and bead balanced on 1-17-2013 at a Camping World RV dealership in Las Vegas NV. When driving it home after the install, traffic was heavy so I only got up to 60+ a couple of times, and not being familiar with bead balancing, I thought the slight shaking to be the beads rearranging themselves to balancer he tires. Two months later, I drove it to get the caliper and Instrument.Cluster recall done and the shaking was still bad, but intermittent, so I called the RV dealership and scheduled an Appt. to have them checked out and rebalanced if that is what was needed. I was told that the RV was test driven before and after the new balancing job and that the difference was like night and day. It had been driven all right, my newly installed cluster lifetime mileage went from 9.9 when I dropped it off, to 6.4 when I picked it up!
While driving it home the shaking was still there but slightly lessened. They also replaced one of the valve stems on an outside dual with one that is too short for my truck tire gauge and my inflator to reach, so I thought I'd just remove the beauty rim, but they torqued it so tight that the custom wrench made for those nuts twisted off.

So, now, I can't check my tire pressure, or put air in that tire, as a 1-1/2" socket is too small to fit over the chrome cover, and a 1-5/8 is too large to turn the highly torqued nuts holding the beauty rim on the steel rim, and I haven't been able to find a 1-9/16 socket at the local auto parts places. After I'm able to check tire pressure in that tire, I plan on having the front tires spin balanced or shaved, at a different tire shop.
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Old 03-31-2013, 07:03 AM   #24
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Originally Posted by Fred Cooper View Post
I suspect your wheels are balanced when off the motorhome, but when bolted back to the brake drum the entire rotating mass is still out of balance.

Find a truck alignment place that can spin balance the front tires while still on the motorhome. Have them check for out of round condition also. I think this may solve your problem.

Fred
I'm with you on this
But failing a result here which may give you a clue.
I would suspect king pins!
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