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Old 07-02-2016, 01:31 PM   #15
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Quote:
Originally Posted by twinboat View Post
Watching.
Ya, quite interesting!!

If I remember right the Koni shocks are adjustable. I have never had them but I remeber reading posts about that.
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Old 07-02-2016, 01:45 PM   #16
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Koni FSD shocks are not adjustable. Something is out of balance.... Can you determine if it is something in the front or from the rear of the rig?
You might look into Centramatic wheel/hub balancers... They worked wonders for me. Much smoother and quieter after I added them front and rear the my rig.
Just a thought.... I remember seeing driveline balancers that are supposed to take care of minor driveline out of balance issues. I cannot remember the brand... I'll see if I can find that product again.
May want to take it into a quality suspension shop and have the go over it... Might be something easy to find and fix. Good luck... This kind of stuff sure can be frustrating.

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Old 07-02-2016, 06:58 PM   #17
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After doing a search I found Koni shocks are not adjustable.

Are you sure they are the right size for your unit?
It seems funny that the problem arose after changing the shocks. Changing the shocks is supposed to give an improvement not the other way around.
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Old 07-03-2016, 06:34 AM   #18
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Quote:
Originally Posted by slickest1 View Post
After doing a search I found Koni shocks are not adjustable.

Are you sure they are the right size for your unit?
It seems funny that the problem arose after changing the shocks. Changing the shocks is supposed to give an improvement not the other way around.
Exactly
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Old 07-03-2016, 09:01 AM   #19
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Koni Reds are adjustable, Koni FSDs are not.
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Old 07-03-2016, 01:17 PM   #20
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Originally Posted by slickest1 View Post
After doing a search I found Koni shocks are not adjustable.

Are you sure they are the right size for your unit?
It seems funny that the problem arose after changing the shocks. Changing the shocks is supposed to give an improvement not the other way around.

Yes, the shocks are the right size for my unit. I talked to representatives from KONI and they recommended the following shocks that would fit my MH. They went by our freightliner chassis/ridgid front axle for our 2001 Fleetwood Discovery which is model #M000042SXC.

Front Koni FSD: 8805-1020
Rear Koni FSD: 8805-1022

The shocks we took off were the original and were bad/no good. I will start with the tires/wheels and go from there. I'm sure it is something minor that can be corrected.
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Old 07-03-2016, 01:51 PM   #21
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There is always the possibility that one (or more) of the new shocks are bad out of the box. These things happen and sometimes it's best to not overthink what is wrong: Change something and a problem comes up, best to revisit the change to see what is wrong instead of going into a different direction.

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Old 07-03-2016, 05:44 PM   #22
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I'd call Koni and get some in put from them. Didn't have it before you put on there shocks, Why know.
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Old 07-03-2016, 06:09 PM   #23
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Quote:
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I'd call Koni and get some in put from them. Didn't have it before you put on there shocks, Why know.
This.

However. If tires were removed for the installation at ANY point, you should remove tires, clean surfaces of all rims, especially on the rear, and torque them properly. Then if the problem still exists, I would consult Koni. Checking the driveline u-joints is fairly easy, and could be worth looking into for the sake of troubleshooting, but should be overly unnecessary until Koni is deemed to be unable to be of assistance any further.
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Old 07-04-2016, 04:33 PM   #24
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Travel8,

You said “…when they fitted the shocks”. I would have “they” recheck their work. Specifically, “they” should be looking to see that the bolts are torqued to spec and that the rubber bushings are compressed.

It is possible that the mechanic was interrupted during the install and forgot to tighten the shock properly. Whenever I run into a strange problem like this, I always go back to the last thing that I done. It is just a good debug technique. Heck, I would check to see if I had four new shocks installed.

You could do a quick wiggle check on the shocks yourself. Grab the each at both the top and bottom and see if you can shake them. You should not be able to do so.

All this assumes that your Koni FSD shocks are similar to the ones that I installed on my GP (gas puller) MH and not some weird concoction used on DP (diesel pusher) MHs.

Since the work was done by someone else and you are positive that there were no vibrations before the new shocks, I would also look for fresh damage (witness marks) done to the underside of the MH. I would look closely at the drive shaft(s) and wheels/tires.

Note: Drive shaft vibrations should be 3X the frequency of wheel vibrations.
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Old 04-02-2017, 08:50 PM   #25
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Sorry for the delayed update.

The Koni Shocks are great! It was in the tires. We had everything checked out, balanced, weighed the MH, adjusted tire pressure and nothing helped. We changed the tires from Toyo to XRV and it made a HUGE difference in how the RV handles and rides. Thanks to everyone for your help. I appreciate it!

Thanks!
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Old 04-03-2017, 07:54 AM   #26
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I am not a MH guy, so need to ask--what kind of driveline does a diesel pusher have?
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Old 04-03-2017, 08:19 AM   #27
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Thanks for the follow-up . Many posters describe a problem, receive replies and suggestions, yet never respond with information or solutions.

Quote:
Originally Posted by Travel8 View Post
Sorry for the delayed update.

The Koni Shocks are great! It was in the tires. We had everything checked out, balanced, weighed the MH, adjusted tire pressure and nothing helped. We changed the tires from Toyo to XRV and it made a HUGE difference in how the RV handles and rides. Thanks to everyone for your help. I appreciate it!

Thanks!
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Old 04-03-2017, 08:45 AM   #28
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I don't know what shocks you had before, If they were Bilsteins like I have then the characteristics of them compared to Konis are different. Konis will stop porpoising because they are stiffer and dampen the road on the downstroke, Bilsteins dampen more on the upstroke, so you don't fell the road as much, potholes, grooves, the zipper, but you will "bounce" more over expansion joints. Konis, as I said are the opposite. This explanation was provided to me by the techs at RallysRus who install shocks and stuff. They are a fulltime Bilstein dealer but handle Konis as well.
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