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Old 11-29-2019, 05:47 PM   #1
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On going vibration issue

What I thought was both a air ride suspension issue, (now fixed), then a bad ujoint issue, (now fixed), still leaves me with a vibration which occurs at highway speeds when I accelerate or decelerate or even just slightly change pressure on gas pedal.
I'm kindly asking anyone with a Newmar DP, with the Cummings 5.9 260HP tied to a Allison transmission that has had similar problems, resolved or not, to call me. 6142707633. Two repair shops later and no resolution is making me regret purchasing this 2000 Kountry Star.
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Old 11-29-2019, 06:07 PM   #2
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Torque converter to flywheel

Quote:
Originally Posted by A1A JOE View Post
What I thought was both a air ride suspension issue, (now fixed), then a bad ujoint issue, (now fixed), still leaves me with a vibration which occurs at highway speeds when I accelerate or decelerate or even just slightly change pressure on gas pedal.
I'm kindly asking anyone with a Newmar DP, with the Cummings 5.9 260HP tied to a Allison transmission that has had similar problems, resolved or not, to call me. 6142707633. Two repair shops later and no resolution is making me regret purchasing this 2000 Kountry Star.
Check the bolts.
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Old 11-29-2019, 06:11 PM   #3
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check the alinment and the tire balance
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Old 11-29-2019, 06:21 PM   #4
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You mentioned a "bad U joint issue". The U-Joint is exactly what I was going to suggest. If that U-Joint is not installed perfectly and is not seated correctly, it will exhibit the symptoms as you describe. Also, when they took apart the driveshaft to install a new U-Joint they could have assembled the shaft 180 degrees out of sync. giving you the same symptoms. And as someone said, check the bolts holding the U-Joint together.
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Old 11-29-2019, 06:24 PM   #5
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Just an educated guess ,After all you have done, my next thought would be rear end pinion having some slack ,if so it will finally knock the seal out and you will get some leakage. I would think who ever put the u-joint in would check for slack in the pinion ! it could just be the pinion bearing Just my best guess but it sure sounds like it to me .
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Old 11-29-2019, 06:40 PM   #6
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Quote:
Originally Posted by Bigd9 View Post
You mentioned a "bad U joint issue". The U-Joint is exactly what I was going to suggest. If that U-Joint is not installed perfectly and is not seated correctly, it will exhibit the symptoms as you describe. Also, when they took apart the driveshaft to install a new U-Joint they could have assembled the shaft 180 degrees out of sync. giving you the same symptoms. And as someone said, check the bolts holding the U-Joint together.
Plus 1
"Everything I have read at least a 1/2 dozen times" says to mark DP drive shaft to put it back as found. If you didn't and it vibes, rotate 180. IDK if they balance the shaft on rig or what.
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Old 11-29-2019, 07:01 PM   #7
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Thanks for your reply. I paid a mechanic to remove and reinstall the repaired drive shaft. I have to assume ujoints were installed properly as when I questioned drive axle shop, they stated it did not vibrate their balancing machine. I questioned "phase" and was told that was correct. I'm assuming drive shaft u joint shop was responsible for correct phase. Not the mechanic installing the drive shaft.
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Old 11-29-2019, 07:02 PM   #8
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Did not balance on rig.
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Old 11-29-2019, 07:05 PM   #9
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Thanks. I will check with mechanic about rear pinion play if noticable when he installed repaired drive shaft.
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Old 11-29-2019, 08:58 PM   #10
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Have you had any off road excursions or hit anything in the road hard? It sounds like a bent Axle symptom that i saw on a pick up truck once. Not likely but how long has it been going on and can you recall any event that may have caused it.
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Old 11-29-2019, 09:31 PM   #11
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I have only owned the Newmar seven weeks. Been in the shop on and off for 5.5 weeks. Only drove coach to Columbus from Indiana and no issues of hitting anything. Cannot account for previous accidents.
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Old 11-29-2019, 09:50 PM   #12
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Sounds like possibly a ride height issue or rear suspension issue

Not there when cruising = driveshaft angle correct

Appears when accelerating or decelerating = driveshaft angle has changed and now driveshaft angle is incorrect.

If it were only happen on either acceleration or deceleration I would say ride height. Since it is doing on both, I would check rear suspension wear, damage, or design flaw allowing rear axle torsion.
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Old 11-29-2019, 10:28 PM   #13
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Plus one here on the ride height adjustment.
The ride height must be adjusted to mfg spec to establish correct driveshaft angles.
If out of spec, angles will decrease/increase excessively and cause the vibration you've described here

There's a few different ways to measure and set ride height, but basically it's done by adjustment of air suspension.

Not knowing what chassis you have, you should reach out to that mfg.


My gut wag is suspension is too low.
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Old 11-30-2019, 07:25 AM   #14
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I fully understand the height level issue. I took to a reputable shop thinking it would return ride height to specs, as they were to replace control arm link to air control valve. Is not $831. Enough to have installation correct?? Da**!!
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