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post #1 of 10 Old 02-16-2017, 05:52 PM Thread Starter
Ed Sebring
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Long time looker

Hi everyone. I have been reading on the forum for a long time. Thanks for all the great things I have learned. We have a 2015 PM 3500. It is a Coachmen Orion RV. It has been very good until a short time ago. When we have it loaded up, sometimes it has a bad wobble that seams to be coming from the rear of the unit. Only does it from 35 to 45 miles per hour when accelerating. Hope somebody has some ideas for me. I did rebalance all the tires. Thanks
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post #2 of 10 Old 02-16-2017, 11:13 PM
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Welcome. I am going to assume you did the obvious, check the lug nuts for tightness? Bent rim? Broken cord in one of the rear tires is what I’d guess. Put on a pair of gloves, run your hand around the perimeter if the tire and feel for a slight bulge. Do both rears then roll ahead 3 feet or so and repeat.

2015 136" HT Diesel Sandstone Metallic Born on 6/12/2015 Campervan build see: http://www.promasterforum.com/forum/...ad.php?t=37177
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post #3 of 10 Old 02-17-2017, 11:02 PM
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I had a bad set of tires on a truck one time I had them rebalanced and check at 2 different shops both said tires were good . I could not for the life of me find the vibrations. the truck had a 2 piece drive shaft so thinking that was the issue I got a new 1 piece alum driveshaft at the tune of $600 and still did nothing changed a few front end parts and still nothing. finally after about a year it was time for new tires and the first drive out of the shop was heaven no more vibration. Just cause the tires balance well and have not visual signs don't mean they are not bad. how old are your tires?

2016, 159" high top, Gas, converted to a camper for 4
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post #4 of 10 Old 02-17-2017, 11:32 PM Thread Starter
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The tires are 2 1/2 years old. The rear tires are always loaded to the max.
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post #5 of 10 Old 02-18-2017, 10:37 AM
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That is another reason to suspect a tire. Rotate them back to front and I’ll bet the vibration goes to the front too.
Best luck.

2015 136" HT Diesel Sandstone Metallic Born on 6/12/2015 Campervan build see: http://www.promasterforum.com/forum/...ad.php?t=37177
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post #6 of 10 Old 02-18-2017, 09:53 PM
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yeah I'm betting tire but have you also checked the hub bearings?

2016, 159" high top, Gas, converted to a camper for 4
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post #7 of 10 Old 02-19-2017, 12:06 AM Thread Starter
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Thanks for all the good ideas. I jacked up the rear. I could not wiggle the tires side to side at all. I gave each wheel a spin. Then spin very easy and for a long time. I used a concrete block and set it beside each back wheel. The tires did not move back and forth sideways at all. The rims were also good side to side and up and down. Both rear tire treads have about 3/16" from high to low. I guess they are both out of round. I wonder if this is enough to cause my wobble when accelerating from 35 to 45 mph? The van is smooth the rest of the time. They are too heavy for me to rotate the tires.

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post #8 of 10 Old 02-19-2017, 01:40 AM
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Resonance? Worn irregular tire wear. Amplifying under load or no load at 35 to 45 mph? Grab the front cv drive shafts and see if any play.
Feel and look close at your tire tread for irregular wear. Rotate tires as in manual. The front goes straight to the back and the back go to the front but right to left and left to right. My old tires did the same thing at about 60 000km. I have since replaced them.

But I think the proper rotation will be your fix. Take it in if you can not do it but make sure they do the right pattern.

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post #9 of 10 Old 02-19-2017, 11:28 AM
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The Original Poster did not reveal which make/model/size his tires are... I had the dreaded tire hop & shimmey on my 2014.

'Road Force Balance' is a newer computerized balancer having a swing arm flywheel-roller that engages after a typical dynamic spin balancing cycle, roller applies 200, 300, 500 pounds force for measuring total eccentric which it translates into a pounds force number to calculate size/location of clip-on lead weights, this number, if below 30, will display a balance solution for the technician to follow that is usually successful.

If you are taking the van in for this service the tires should be full highway running temperatures when they pull the wheels from the vehicle or else the stiffness of the compounds defeats the balance machine which are usually built for lighter tires so that is not so much important with dinky-door passenger tires but for 10-ply E or Euro-C rated commercial tires it really matters.

I found the road force balance is a temporary fix for any tire that can make a 2-ton truck wobble and hop, is only good for a couple thousand miles before rebalancing, at 15,000 miles I replaced the tires and asked the techs to check the ones being removed... Attached is photo of five Vanco Euro C tires with chalked numbers from Road Force measurement: 39, 49, 61, 63 and 19 from the spare. The tire tech said only one, maybe two were balanceable. I'm afraid I put 50,000 miles wear and tear on the suspension & drive shafts in 15,000 miles these tires were being driven on, I finally got sick of the dealerships service writers lying and obstructing my safety concerns so I went with Michelin's...

Find a Tire shop that has the new balancer machines & have them spin them to see what is up.
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2014 Diesel 2500 window wagon
Michelin 245x75x16 Defenders
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post #10 of 10 Old 02-19-2017, 09:07 PM Thread Starter
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Thanks again for all your inputs. I think I will go looking for new tires. I now have Nexen 225 75 16 E rated. 2640 lb. max per tire. This is an RV, so I may look at 245 75 16 E at over 2900 lb/tire. This will give an extra margin. Any tires work better than others? Thanks
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