[AT] Clutch Shudder

[Spencer Yost]

I was recently reflecting on the long list of things that I know absolutely nothing about, and believe it not Belarus tractors were on that list. :-)

But that's never stopped me before so here goes…

With dual plate clutches, I have seen where a full disengage drags the second plate between the floater plate and pressure plate. Did you check for that?  If that is that case you should see a little reverse movement that ends up grabbing the outboard friction plate right before final disengagement.  Might need a helper operating the clutch while you inspect.  I hope you have a good access hole to observe.  

By the way, dual plate clutches are common on high output race cars around here where weight and space make high horsepower single plate clutches impractical. You might want to check the race car sites. They probably have a lot of experience with dual plate clutches.

That's all I got. Sorry.

PS:  About 10 hours of hard use might correct this as well if you find nothing wrong.

Spencer Yost

> On Jan 18, 2018, at 9:07 PM, Cecil Bearden <crbearden at copper.net> wrote:
> 
> It is not an old tractor, but the design is the same.   I do not want 
> this to reflect badly on the tractor name as they are really good 
> tractors, but I think something went wrong in the manufacturing.
> I bought a new MTZ/Belarus 125hp tractor w/loader.  It has a dual plate 
> dry disk clutch.   When actuating the clutch it will engage and as you 
> try to inch up to an attachment, as you feather the clutch, it works 
> fine, then when you totally disengage the clutch, the tractor will 
> shudder and jump and will run forward or back depending on the gear you 
> are in, and the brakes have to be applied to stop it.  It will quit the 
> shudder if you engage or "feather" the clutch.  As soon as you 
> completely disengage, the shudder occurs. I have greased and checked the 
> release bearing and found it to be good.   A bolt was loose that holds 
> the straps from the intermediate plate to the pressure plate.   The 
> weirdest thing I noticed was 3 bolts near an attachment bolt in the 
> pressure plate, not holding anything.  One bolt had a nut under the head 
> and 4 nuts threaded on the other side.  The one next to it had 2 nuts, 
> and the other had only one.   They did not hold anything, and did not do 
> anything to position the intermediate plate.
> What are these bolts for?  Balance weights??
> I think the pilot bearing may be frozen and turning the input shaft.  
> The tractor has a live PTO and  live hydraulics.  The hyd pump and PTO 
> are driven by a splined sleeve that fits into a splined hub in the back 
> of the pressure plate and connects to the hollow shaft that the 
> transmission input shaft goes thru.   It is possible that the hollow 
> shaft is stuck to the input shaft and trying to move the tractor.  The 
> only thing I have not tried is turning the PTO on while inching the 
> clutch to see if it shudders....
> 
> I think the only way to solve the problem is to split the tractor and 
> send the clutch to a good rebuilder to check the operation and the 
> balance. and also to check the input shafts...
> Anyone experienced anything like this.?
> 
> 
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