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Old 03-20-2014, 02:43 AM   #1
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Drive shaft

I have had my 2008 Allure 2.5 years and done 12k miles, and now at 32k. I spoke with my service technician yesterday after his return from driving the coach to the MOT (UK Annual Vehicle Test). I had asked him to assess the odd vibration that comes up through the coach when under high load in lower gears. It is not horrendous just a noticeable phenomenon. As it has been there since I had the coach itís one of those things I have just accepted. Anyway he did notice it and his first thought was that the drive shaft was out of balance.

Well I read up on it in the manual and indeed the drive shaft is a balanced one and they specifically caution against applying any underseal or coatings to the shaft for this reason in the manual. So it seems he may be on the right track. I do not know if it was coated by the PO but will try to get under later today and see.
Has anyone had any experience of this issue?
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Old 03-20-2014, 03:33 AM   #2
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Another issue that can cause this is the drive shaft being at wrong angle the main
reason ride height adjustments are so important.
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Old 03-20-2014, 08:22 AM   #3
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My Allure is well undercoated so I guess it would be possible that someone at the factory got some of that on the drive shaft.
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Old 03-20-2014, 08:32 AM   #4
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A check will resolve the under coat issue but you said under load and lower gears that
means the drive shaft is not turning fast where a balance issue would show up.
If the angle of the drive line is not right that will show up at low speed and load and
will be reduced with reduced load and higher rotation speed of the drive line.
I had the same problem and it took sometime to get the shop to check ride height
at the proper place and measurements which were found to be set wrong when
corrected problem gone.
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Old 03-20-2014, 08:58 AM   #5
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Is there a document on ride height adjustment for the Allure that I could provide to my UK based techs who are unfamiliar with US RV's. Thanks.
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Old 03-20-2014, 09:02 AM   #6
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Quote:
Originally Posted by sallylillian View Post
Is there a document on ride height adjustment for the Allure that I could provide to my UK based techs who are unfamiliar with US RV's. Thanks.
What chassis do you have? With that info getting all the information needed
should not be hard to come by.
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Old 03-20-2014, 09:12 AM   #7
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The ride height adjustments has to be done at the right place and the measurements have to be right and we are talking 1/8 to 1/4 inch wiggle room.
My problem I am sure was the retail shop foreman adjusted it to better something and the shop I took it too did not measure it at the right place and after I went under and measured it I told them I would show them where and how to do it right.
Bottom line until I measured it the shop had had about everything apart in the rear
with a bill to prove it.
No they did not eat the bill.
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Old 03-20-2014, 09:23 AM   #8
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Its a CC Dynomax chassis built by CC. I have found a sheet detailing the ride height measurements, but not how to correct/adjust them.
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Old 03-20-2014, 09:29 AM   #9
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It may be as simple as worn U-joints. Easily replaced. I don't know how yours could have worn out in that few miles, but maybe they didn't grease them when new. I doubt that the factory installed the drive shaft incorrectly or at the wrong ride height.
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Old 03-20-2014, 09:33 AM   #10
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Where to measure and what the setting has to be is the big one. Adjustment depending on the valve used can be either a control rod adjustment or a screw
adjustment.
The normal way is to adjust the height then dump air and air back up and measure
do this a couple of time to insure proper setting.
Be very careful when doing these as a mistake will drop the unit to zero ride height
and you want to have room so the person doing the work is not crushed.
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Old 03-20-2014, 09:44 AM   #11
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Thanks, don't worry it will be done over a pit!! By someone skilled! I have HWH active air which I think adds an additional problem so I have just emailed them. Many thanks for your input.
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Old 03-20-2014, 09:52 AM   #12
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The good part is a fast check for the proper measurements at the right place will
address that issue and does not take any time.
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Old 03-20-2014, 10:02 AM   #13
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Possibility that driveline is out of phase. Easy to check and correct.
DRIVE LINE PHASING

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