[AT] Clutch Shudder

[Indiana Robinson]

We had that problem once on the Ferguson TO-20. While it was split for
other work under warranty the dealer put a new clutch in it. After some
years the shudder developed and got worse. When we split it we discovered
that the dealer had put a thick walled bronze bushing in it as the pilot
bearing. I don't recall if that was what it came with new or not. That
bushing was worn pretty badly. All we did was pop the bushing out and
installed a ball bearing pilot bearing in it and it ran fine for many years
and was still in it when we sold it (shouldn't have). The sealed ball
bearing fit perfectly in the hole where the thick walled bushing had been.


.

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On Thu, 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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-- 
-- 

Francis Robinson
aka "farmer"
Central Indiana USA
robinson46176 at gmail.com