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Old 11-05-2006, 03:25 AM   #1
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Newmar Owners Club
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Location: Franklin, Michigan
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I have talked about this before in earlier posts. There is a "hopping" vibration at 52 mph - about 60. Then vibration is less noticeable. Almost certain it is coming from the rear.

However, all tires have been checked w/minimal adjustments. Dealer spent 4 hours adjusting pressures. Ended up w/Tag just under 20 lbs less than drive axle.

I have indicated driveline suggestions from this forum to the dealer and the Cummins shop.

They both knew of that type of problem and have fixed it before. They said that this was a different type of vibration (hopping) than the kind you feel w/a driveline that is either out of balance or not lubricated correctly.

They are still working on it but, I was hoping for any help, suggestions etc.

Spartan's official word right now is to load it to average, weigh it and adjust tire pressure accordingly.
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Old 11-05-2006, 03:25 AM   #2
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Newmar Owners Club
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Location: Franklin, Michigan
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I have talked about this before in earlier posts. There is a "hopping" vibration at 52 mph - about 60. Then vibration is less noticeable. Almost certain it is coming from the rear.

However, all tires have been checked w/minimal adjustments. Dealer spent 4 hours adjusting pressures. Ended up w/Tag just under 20 lbs less than drive axle.

I have indicated driveline suggestions from this forum to the dealer and the Cummins shop.

They both knew of that type of problem and have fixed it before. They said that this was a different type of vibration (hopping) than the kind you feel w/a driveline that is either out of balance or not lubricated correctly.

They are still working on it but, I was hoping for any help, suggestions etc.

Spartan's official word right now is to load it to average, weigh it and adjust tire pressure accordingly.
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Newmar TBD
Sue (DW):Celia 18, Alec 17, Isis (Abyssinian)
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Old 11-05-2006, 01:03 PM   #3
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Location: Wellington, Florida
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When I picked up my signature coach in August 05, I had vibration problems. The following is what was done to correct the problem.
1. Get the coach weighed and adjust tire pressure.
2. All tires remounted. Some were mounted slightly off center on the wheel.
3. All tires spun balanced on a truck tire size spin balancing machine.
4. Finally, the front tires were replaced by Michelin. They were out of round enough to cause the vibration at the speeds you mentioned.

The out of round could not be detected when the tires were on or off the coach. The new tires are Michelin 275X70X22.5 LRJ XZE2+. The new tires fixed the fibration immediately and 100%. The coach has been very smooth ever since.

If you still have a vibration, consider looking hard at replacing the tires.
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Old 11-19-2006, 10:06 AM   #4
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5 out of my 8 tires were initially mismounted by Spartan's tire dealer. After a couple of days of remounting and rebalancing, Michelin replaced 2 tires.

My ride height adjustments were also off.
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Old 11-19-2006, 02:12 PM   #5
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Turned out to be the inside dually's. The wheels were way out of balance. Dealer, to accommodate me, took a DSDP 40' to tire shop to substitute. Turns out it had the same problem. Had to use another unit on the lot.

Were running smooth now.

Based on my experience and the notes I have received, Spartan has some problems w/ship quality and testing. Quite disappointing as the Chassis was the starting point for my search for the new coach.
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