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Old 11-25-2019, 03:45 PM   #1
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RV SHAKES AT 65mph Thor Vegas 24.1

Hello, anyone know what we can do about our RV shaking at 65mph, we have a class A Thor Vegas 24.1 2014 ? Someone said piston damper ??
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Old 11-25-2019, 03:47 PM   #2
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The damper will only damp(potentially) the shake, not cure it.
You've hopefully tossed a wheel weight somewhere or bent a rim.
Or,
A suspension part is broken or worn out.

A front end or alignment shop is your best bet for a cure.

It might be a free fix, it might be $5,000, but a damper is no where near the answer.

Get two or three diagnosis FROM SHOPS, NOT FORUMS, even if you have to pay for the diagnosis.

Whatever the fix is, you can't fix it yourself. There's no reason to speculate. Go to a shop. Even if it's a low tire, go to a shop.

Not everyone need do everything
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Old 11-25-2019, 04:07 PM   #3
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How many miles are on your ATV?
Have you recently put new tires on it?
When did you last check your tire pressures?
Have you recently hit a pothole of significance?

We need a bit more info for any intelligent answers to "crawl out of the slime"
But
Tire pressures
Wheel weights
Front-end alignment

would be my best guess of the likely culprits.

Good luck!
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Old 11-25-2019, 05:13 PM   #4
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I have 8,500 miles on my 2019 Vegas 27.7. Last summer my lead foot took my over 80 mpg many times across Iowa and Nebraska. No shakes or pulling.


I would get alignment checked. I have no idea where.
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Old 11-25-2019, 05:19 PM   #5
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Check tire pressures first: it's the easiest, and cost nothing but some time.
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Old 11-25-2019, 07:27 PM   #6
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Ditto for truck alignment shop, I wouldn't go to an rv dealer. It's a common commercial chassis.
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Old 11-25-2019, 07:33 PM   #7
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Did the alignment and all tires checked at Sullivan Tire, big truck tire place. Hit no potholes ...
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Old 11-25-2019, 07:49 PM   #8
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Quote:
Originally Posted by SueTac View Post
Did the alignment and all tires checked at Sullivan Tire, big truck tire place. Hit no potholes ...
Then you have the hard part, finding a shop, done.
Take it to them and tell them, in detail, what happens.

For all anyone can guess your ac unit is trying to fly off the roof, catching air and causing the shudder.

A shop you trust, that knows the vehicle, is the choice to make.

But
There's a stretch of down hill curvy road outside of Payson Arizona that looks and feels like good really smooth road, but makes the 30mph brakes shudder in the Ford AND the avalanche so bad you think you've had a blow out.
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Old 11-26-2019, 12:31 AM   #9
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Does the shaking span a 10-15 mph of when it starts and stops?
If so you have a broken cord in a steer tire, if you have a jack heavy enough to lift front end jack it up enough to get front wheels off the ground and see which one rolls on it's own.

That is a very common problem with 22.5 tires, if you end up needing new steer tires go with a load range h its a 16 ply tire and I bet yours are load g 14 ply.
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Old 11-26-2019, 12:35 AM   #10
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Yes it happens between 62 - 69 mph ... and then sometimes not ! But I think you hit it on the head .. so you think getting two new steer tires with a heavier load ?
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Old 11-26-2019, 12:56 AM   #11
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Sounds to this keyboard diagnostician as some sort of tire balance problem. How many miles on the tires? Have they ever been rotated?
Could be a broken belt in a tire like sismdrm stated. As you have had the front end aligned and tires checked I would assume that all front end components were checked tie rods ball joints etc? If not those need a look.
Another thought drive shaft universal joints or a center carrier bearing can cause a vibration when those parts start to wear out.
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Old 11-26-2019, 01:20 AM   #12
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We will have the front end components checked out. I am looking for a good place to take it in either Knoxville or Nashville... any suggestions?
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Old 11-26-2019, 02:41 AM   #13
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Originally Posted by SueTac View Post
Did the alignment and all tires checked at Sullivan Tire, big truck tire place. Hit no potholes ...

You state tires were ďcheckedĒ, but were they balanced? Sounds like only the two front tires are in question. However, were they checked as in inspected for damage, or actually balanced?


What you are experiencing can be caused by a tire thatís not round (like broken belt as suggested by others), but most common problem is a tire thatís not balanced. The speed range you mention (62~69 MPH) is the front suspensionís natural frequency, so any tire problem is magnified.

My vanís front suspension worst speed is at 73~74 MPH, and when one of my front tires isnít balanced correctly, it starts to shake at about 70, builds up at 73~74, and then disappears as I approach 80 MPH.

This kind of problem is magnified by poor shocks/dampers, but even new/good ones canít correct for a bad tire or one that is significantly out of balance.

If shop did balance front tires in addition to alignment, then a more serious problem should be investigated.
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Old 11-26-2019, 01:31 PM   #14
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A higher load range is gonna cost more but would last longer, as the running surface of the tire is thicker.
Have you looked at the tread on the inner and outer edges and are they worn even or have shoulder issues like flat spots or "river wear" thats the most common issue but is generally followed by a pulling left or right, only why to fight that is tire rotation,The shaking is most always from belts broken.

I would start by looking for a tire dealer like bandag, best one tire, or a tire dealer who specializes in semi tires who can install and balance I would not use a truck stop garage like petro or loves.
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Old 11-26-2019, 02:08 PM   #15
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The person asking for help has a Vegas, which has LT225/75R16 tires, not 22.5” tires.
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Old 11-27-2019, 01:32 AM   #16
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Just a quick follow up, we had the tires rotated and problem fixed. Front tires on too long without rotation. Thank you all !
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Old 11-30-2019, 12:49 AM   #17
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Quote:
Originally Posted by SueTac View Post
Hello, anyone know what we can do about our RV shaking at 65mph, we have a class A Thor Vegas 24.1 2014 ? Someone said piston damper ??
I had a bad shake in my 2018 Thor 37rb class A at that speed. I stopped at a rest stop and checked outside. The emergency escape window in the loft was not hooked. And apparently flapping out in the wind at speed. Make sure all your windows are locked in place first
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Old 11-30-2019, 12:52 AM   #18
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Sue,
Glad to see that you found and fixed the problem!
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Old 11-30-2019, 06:14 PM   #19
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get rid of wheel weights and have tire shop put balancing beads inside tires. they automatically balance constantly
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Old 11-30-2019, 07:26 PM   #20
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RV shakes

What kind of shaking, is it in the steering wheel or can you feel it in the floorboard if you feel it in the floorboard it could very well possibly be your joints in the driveline or if it has more than one drive line under it it could be the bearing that supports the two if it shakes in the steering wheel it could be that you lost a wheel weight an alignment or a tire problem.
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