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11-04-2014, 06:51 PM
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#1
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Junior Member
Join Date: Feb 2013
Posts: 23
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Vibration
Just bought a new to me 2008 34 fdds alpine. Just 16000 miles but has a bad vibration under load. Did not notice until we were on our way home paid in full. Just droped it off at a small cummings repair shop in Paso Robles ca. They really do not have a clue what is the problem. Anyone have a suggestion on where it should go tomorrow. I really need to fix the problem. Thanks Mike
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11-04-2014, 08:05 PM
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#2
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Senior Member
Alpine Owners Club
Join Date: Jun 2003
Location: Ontario, CA USA
Posts: 1,400
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I would check the universal joints. They should be lubed with a high quality grease designed for U-Joints every 3000 miles, per WRV. A friend's 2000 had a vibration and it was the U-Joints.
Bad U-Joints can cause a vibration while driving.
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11-04-2014, 08:14 PM
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#3
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Senior Member
Join Date: Oct 2014
Posts: 7,867
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Do a quick check of ride height, particularly rear ride height.
Even an inch or two out of spec materially changes drive line angles (very short drive shaft on any DP). That could be the problem or could certainly contribute to wear on U joints.
Brett
2003 Alpine 38'
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11-05-2014, 07:47 AM
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#4
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Senior Member
National RV Owners Club
Join Date: Feb 2012
Location: Spokane Valley, Wa
Posts: 1,987
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Quote:
Originally Posted by wolfe10
Do a quick check of ride height, particularly rear ride height.
Even an inch or two out of spec materially changes drive line angles (very short drive shaft on any DP). That could be the problem or could certainly contribute to wear on U joints.
Brett
2003 Alpine 38'
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Yes sounds like ride height is not set right, been there and not every shop
knows where to measure and set for your motor home.
__________________
Art
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
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11-05-2014, 08:44 AM
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#5
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Senior Member
Fleetwood Owners Club
Join Date: Jan 2010
Posts: 1,391
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Most likely rear ride height.
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11-05-2014, 11:38 AM
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#6
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Senior Member
Alpine Owners Club
Join Date: Dec 2006
Location: Olympia
Posts: 861
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Mike,
Be careful about taking the advice of non-Alpine owners on this one.
__________________
Jeff
'99 Alpine Coach
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11-05-2014, 11:46 AM
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#7
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Senior Member
National RV Owners Club
Join Date: Feb 2012
Location: Spokane Valley, Wa
Posts: 1,987
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The make and model of the chassis determines ride height not the coach attached to it.
__________________
Art
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
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11-05-2014, 12:22 PM
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#8
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Community Administrator
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Sep 2010
Location: Marquette, Michigan "Da UP" & Lehigh Acres Florida
Posts: 21,822
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Quote:
Originally Posted by wolfe10
Do a quick check of ride height, particularly rear ride height.
Even an inch or two out of spec materially changes drive line angles (very short drive shaft on any DP). That could be the problem or could certainly contribute to wear on U joints.
Brett
2003 Alpine 38'
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__________________
John & Cathy R.
06 Pace Arrow 38L Workhorse W24
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11-05-2014, 01:09 PM
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#9
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Senior Member
Join Date: Oct 2014
Posts: 7,867
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Quote:
Originally Posted by JohnRR
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Thanks, John.
Been around the RV world and forums for a long time. But, just bought the Alpine and found this the best site.
And, both Jeff and Art are correct. the chassis maker (in the case of Alpine it is the Gary Jones designed PEAK CHASSIS) determines the suspension components and proper ride height.
Brett
2003 Alpine 38'
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11-05-2014, 08:28 PM
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#10
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Senior Member
Alpine Owners Club
Join Date: Sep 2005
Location: Selah, WA
Posts: 107
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Most of us with '08 or '09 Alpines had to replace one or both u-joints. Sounds like you're just catching up with the rest of us. There is a lot of info, including part numbers for each u-joint, back a year or more in this forum. Vibration under load is the main symptom.
__________________
Terry McGuire
09 Alpine Limited SE 36FDTS
14 Chev Silverado Toad
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11-05-2014, 08:34 PM
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#11
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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The drivelines on DP's are VERY short and the ride height is critical to longevity, even ½" is enough to cause problems over time.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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11-06-2014, 09:54 PM
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#12
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Junior Member
Join Date: Feb 2013
Posts: 23
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vibration.
Hi, Everyone who replied, THANKS ALOT. Just picked up 2008 34 fdds from cummings. Both ujoints shot. replaced still small vibration. Had wheels taken off to rebalance. Front ones both delaminating. Stopped there and put a set of 6 295 80r 22.5 yokahomas on. Wow. Runs like I had hoped it would. How do I set or check my ride height in the rear? Can someone please give me the spec? Thanks again Mike
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11-06-2014, 10:04 PM
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#13
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by MIKE JANGAAR
How do I set or check my ride height in the rear? Can someone please give me the spec? Thanks again Mike
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You need to get the spec from the chassis manufacturer. It is measured between a suspension point to another suspension point and has nothing to do with the body parts.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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11-07-2014, 05:30 AM
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#14
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Senior Member
Join Date: Nov 2005
Posts: 7,383
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Check out the the Alpine Coach Association [ACA] website Tech library--there is one document out there that provides both specs and instructions on points to measure from. To my knowledge, this is the only document that exists on the ride heigh and while it was published for earlier coaches, it appears to apply to the later models too.
PS--And as stated earlier, our coach builder was the chassis manufacturer.
__________________
Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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