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Old 10-31-2007, 07:42 PM   #15
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1984 31' Excella
Norfolk , Virginia
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Vibration Problem

Try machine shops that specialize in balancing.
You have to balance large electric motor armatures, pump impellers and boat props.
Surely you can find someone that can balance a lump of cast iron, or has all the industry left this country.
If you find someone take it to 1000 rpms.
Please keep us posted on those tires.
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Old 10-31-2007, 08:02 PM   #16
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I'm hopeful about the tires. They are Cooper Custom Trailer Plus. It's an ST tire and the only one I've found that is speed rated. Apparently most (or perhaps all other) ST tires are only rated to 65mph. These are rated to 112mph -- not that I'll ever go that fast.

I'd read so much concern about the Marathon, that I was looking for an alternative. Was unable to get the Cooper's at any local store (don't know why, since most places could get me passenger Coopers), but ordered them on line with no problem - arrived in a few days. $127 each, but hopefully worth it.
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Old 10-31-2007, 09:10 PM   #17
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Help for a vibration problem

georgezink
I would have gone with the Cooper Custom Trailer Plus, but I couldn't get them locally either (Norfolk Virginia). I bought 16 inch rims and 16 inch light truck tires instead with a speed rating of 99 MPH. The BF Goodrich Commercial T/As (LT225/75R16 Load Range D) are more available on the road. Coopers marketing structure is the problem.
Your right about the only ST tire rated faster than 65MPH.
In My Honest Opinion you will have no problems with those tires. Let me know about the machine shops/electric shops and the balancing thing.
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Old 11-01-2007, 02:00 AM   #18
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Georgezink,

Sorry this thing is out of order.

(2) I would then take the tires & wheels back and explain your problem to the shop that mounted them. Have them rebalanced and stay with them while they do the job. See how much weight is put on each wheel. If the weights are large, 2-3 inches long, ask them to put two or four staggered on inside & outside. You could ask them to rotate the tire 180 degrees if weights are large. Also, ask the owner if the operator knows what he is doing, Experienced! Get his best person. Offer to pay something. Be the good old boy. Most shops don't know how to balance a tire except fast. If you are polite & explain your problem & you get any resistance, your are in the wrong shop!!!!

My Toyota dealer has their own balance machine to resolve customer complaints. They get stuck in between the customer and the tire company on ride complaints.

When I bought trailer tires last year, I went to 3 dealers before I found one that would promise me an adjustment if I had uniformity problems (balance or radial / lateral force problems).

(1) Remove tire & wheel & get a can of penetrating oil with the long spray extensions and make your own dial indicator. Rotate the hub and move the spray extension up to the hub. Keep turning hub & adjusting spray can until you can see how much variation is in the hub. I would not expect more than 1/32 inch. Check bearing adjustment for any play before.

(3) With tire & wheel mounted on the hub, check the centerline runout with the spray can. If it is 1/8 inch on the centerline of the tire, they will not
balance. Send the tires back assuming the hubs & alloy wheels are ok.
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Old 11-01-2007, 09:24 AM   #19
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As a last ditch effort and just for kicks, see if the tire shops machine will hold the tire/rim with the hub still bolted on . You would have to assure the same tire bolted to the same hub in the same orientation, but the assembly would be balanced.
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Old 11-12-2007, 06:49 PM   #20
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Just wanted to wrap up this thread.

I found that one wheel bearing was a little loose, so snugged it up. Checked the drums, wheels & tires and all were nearly perfectly round -- no high or low spots.

Seems to ride better now, but I'll still get another good spin balance before the next trip and I'll check the ball & socket for wear. Right now I'm redoing the interior. Just ordered new converter, range, refrigerator, furnace, water heater, 2 new dump valves, sink, faucets, etc. It's going to be a long winter.

Thanks for all the help with the vibration problem. I'm sure I'll have other questions as this project progresses.

Geo...
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