[AT] Clutch Shudder

[Doug Tallman]

I have no idea how the clutch actually operates but what you are 
describing sounds to me like the throw out for the clutch is traveling 
too far. If you feather the clutch out and it quits moving can you 
adjust the pedal so it doesn't push as far? Doug T

On 1/18/2018 9:07 PM, Cecil Bearden 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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