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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #1  
Old 05-13-2019
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Default Slack Adjuster on '77FC

As I was looking for a source of a vibration noise (sometimes happens around 60-67MPH) I found my front left (drivers/road-side) slack adjuster has a fair amount of horizontal play on its shaft. I don't think this is normal and am curious as to how to fix this play. Any input is welcome, thanks.

Please see a video of the issue HERE.
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Old 05-13-2019
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Quote:
Originally Posted by Virtue22 View Post
As I was looking for a source of a vibration noise (sometimes happens around 60-67MPH) I found my front left (drivers/road-side) slack adjuster has a fair amount of horizontal play on its shaft. I don't think this is normal and am curious as to how to fix this play. Any input is welcome, thanks.

Please see a video of the issue HERE.
Tighten the bolt before it falls off. Its held on with a snap ring instead of a bolt and after looking at your video I don't think you have much of a problem. You can shim it a bit tighter if you like. Here is the deal, if you don't know Air Brakes, take it to someone that understands the system.
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Old 05-13-2019
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Thanks, a shim would make sense. I was just not seeing any "adjustment" as far as a bolt but need to look closer for a snap ring. I do understand air brakes are a life or death deal and would not try to "adjust" something I was not familiar with. It just seemed loose and I needed the opinion of the WOG as to a legitimate fix. I do believe this is the sound I'm hearing/feeling at 65mph and would like to rectify this vibration before an extended trip.

Thanks again, Matt
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Old 05-13-2019
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I don't think you have a problem,all slacks will move like yours.
But you should learn how to adjust them,you never know when you may need to do so.
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Old 05-13-2019
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I really doubt that is your vibration. It just sits there going down the road until you apply the brakes. No reason it would vibrate.
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Old 05-13-2019
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I found the recommended “end play,” which should be between .005- and .025-inch. I'll measure and shim if necessary.

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But you should learn how to adjust them,you never know when you may need to do so.
I agree Randy, I've done a bit of research and it does not look too involved and as with anything else I'll learn everything I can and jump in...Thanks!
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Old 05-13-2019
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I really doubt that is your vibration. It just sits there going down the road until you apply the brakes. No reason it would vibrate.
x2 - I doubt this is what you are feeling. There's no reason for it to vibrate and when in use the pressure on it won't let it vibrate. I think you need to keep looking, axle bearing, brakes, drive shaft, carriage bearing, etc...

I found a vibration in my old '63 conversion that drove me nuts! It would vibrate over 65mph consistently. I had the drive shafts balanced, the u-joints replaced, the carriage barrings replaced. then one day I was researching the GMC 401 v6 and found it red lined at a very low rpm. I slowed it down a bit and the vibration went away. Sometimes it's not obvious.

And yes, I had to replace that engine not long after.
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Old 05-16-2019
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Thanks, everyone.

I agree that the slack adjuster is not the source of the vibration but it was the source of the slight thumping I heard at 65mph (sounded like a little man with a tiny rubber mallet tapping on the bottom of the bus).

I shimmed the adjuster to within specs and the noise stopped, but I do need to find the original source causing the vibration on the front driver's side wheel...possible wheel balance issue?

If I find it I'll let you know, it may now be more difficult to find as the only indication was a vibrating adjuster that HAD excessive end play and it only made a noise once in a while when the conditions were right.

Thanks again, Matt
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