90k wobble

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bromleyxphil
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90k wobble

Postby bromleyxphil » Sun Jul 03, 2016 4:59 pm

Hi guys after dropping Lynn at Bordeaux airport I caught up with day one of Le Tour and am now sat in Calais waiting for my ferry on Tuesday. I have done a few miles to think about my wobble. When I go over 90k a wobble, just like an unbalanced wheel comes from the back of the truck. It then gets worse the faster I go I have had it up to 110 and I think the wobble is slightly less but almost imperceptible. I have had all of the wheels balanced and I have no problem on the front axle.
Thoughts and solutions please?
Could one of the hubs be out? If so how do I find out and how do I fix it?
Could it be something obvious I can't think of

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NeilandPat
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Re: 90k wobble

Postby NeilandPat » Sun Jul 03, 2016 5:49 pm

Don't go over 89 k. Simples.

Neil

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NeilandPat
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Re: 90k wobble

Postby NeilandPat » Sun Jul 03, 2016 5:51 pm

My prop shafts have balance weights attached to them , could it be this ?

Neil

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steffUK
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Re: 90k wobble

Postby steffUK » Sun Jul 03, 2016 6:30 pm

Just a few pointers:
- are all the weights still on? Maybe you lost one and that caused the wheel to wobble.
- rear propshaft U joint ok? All nuts tight on both ends (diff and transferbox?)
- hubs ok? wheel bearings ok or have play?
Cheers
Stefan

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bromleyxphil
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Re: 90k wobble

Postby bromleyxphil » Sun Jul 03, 2016 6:38 pm

Thanks guys, the wheel weights are all fine the and the prop has some metal tabs welded on. The rest all seems tight but I will have to jack her up when I get home. It's quite a vibration when it gets going so I will have to bottom it out.

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Brian-reynolds
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Re: 90k wobble

Postby Brian-reynolds » Mon Jul 04, 2016 7:18 am

Good to hear you are both well and coming home!

I look forward to hearing about your exploits.....

Simon had his propshafts balanced as one of his was bent slightly!

It turned out these DAF propshafts are filled with a sort of cardboard inside that had disintegrated which did not help, so I believe it was all removed during the balancing.

Simon?

B.

skipperted
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Re: 90k wobble

Postby skipperted » Mon Jul 04, 2016 7:50 pm

Hello Brian , everyone, I am still away boatbuilding but the major work is now done and I'm hopeful to be back in my truck by the end of July.
Yes I had a bad case of the wobbles at perhaps lower speeds , I might have done the damage myself but I don't tell folks that .
I think some idiot drove over a something and bent the forward prop shaft , after trying all sorts of other things I took the truck to a prop shop where they quickly ran up and balanced all three shafts. Now I could balance a coin on the steering wheel at all speeds, it really made a terrific difference and was not expensive. Was all done in about 1.5 hours.
I also found that the shafts were lined with a sort of cardboard, probably not really cardboard but something like it. Apparently to stop them tunefully singing when turning , however in mine all was a wet messy lump, not helpful when balancing, so we took it out. Fortunately no harmonics at least not before 80k,my top , downhill speed.

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bromleyxphil
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Re: 90k wobble

Postby bromleyxphil » Wed Jul 06, 2016 5:31 am

skipperted wrote:Hello Brian , everyone, I am still away boatbuilding but the major work is now done and I'm hopeful to be back in my truck by the end of July.
Yes I had a bad case of the wobbles at perhaps lower speeds , I might have done the damage myself but I don't tell folks that .
I think some idiot drove over a something and bent the forward prop shaft , after trying all sorts of other things I took the truck to a prop shop where they quickly ran up and balanced all three shafts. Now I could balance a coin on the steering wheel at all speeds, it really made a terrific difference and was not expensive. Was all done in about 1.5 hours.
I also found that the shafts were lined with a sort of cardboard, probably not really cardboard but something like it. Apparently to stop them tunefully singing when turning , however in mine all was a wet messy lump, not helpful when balancing, so we took it out. Fortunately no harmonics at least not before 80k,my top , downhill speed.

Thanks Simon
Could I ask where you went to get them balanced ?
Also do you, or anyone else know if it's possible to balance hubs or perhaps wheels on in situ on the hub?

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steffUK
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Re: 90k wobble

Postby steffUK » Wed Jul 06, 2016 2:11 pm

In my racing days I had several prop shafts made to measure and these guys were fantastic: http://www.baileymorris.co.uk/
They do all sorts for lorries to racing and you can discuss your needs with them.
Good luck
Stefan

skipperted
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Re: 90k wobble

Postby skipperted » Thu Jul 07, 2016 8:29 pm

Hi, these were the guys who did mine, place to park right outside, very friendly. http://www.firowpropshafts.co.uk


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