Help ID debris on drain plug magnet

[jwt27]

Drained the hydraulic oil on my 7600 today. The middle plug had a magnet with
this fairly sizable chunk attached to it.

It's about 2.7mm thick, original diameter was approx 127mm or 5". Faces are
smooth, edges rough. Any ideas what it might have been? Hope it wasn't too
important...

 

[Bern]

A PTO clutch wave spring would about fit those dimensions. I can maybe check one next time I'm at the shop, as I think I have one there to measure.

#6 in the link below.
PTO clutch

 

[jwt27]

Thanks! It does look a bit wavy so that might be it.

What does it do though? I haven't noticed any issues with the PTO. Maybe the
rest of that spring is still in place somehow.

 

[Sean in PA]

(quoted from post at 07:14:58 05/03/23) Thanks! It does look a bit wavy so that might be it.

What does it do though? I haven't noticed any issues with the PTO. Maybe the
rest of that spring is still in place somehow.

It's part of the PTO clutch pack. If it failed, it may have been replaced long ago and that is just a piece of the original failed one that has eventually found its way to the magnetic plug.

 

[jwt27]

(quoted from post at 13:54:37 05/03/23)

(quoted from post at 07:14:58 05/03/23) Thanks! It does look a bit wavy so that might be it.

What does it do though? I haven't noticed any issues with the PTO. Maybe the
rest of that spring is still in place somehow.

It's part of the PTO clutch pack. If it failed, it may have been replaced long ago and that is just a piece of the original failed one that has eventually found its way to the magnetic plug.

I like that scenario better, thanks

So without this spring there wouldnt be any pressure on the plates, and the
whole clutch just wouldn't engage, is that right?

I did see this spring is sold on the store page here:

https://www.yesterdaystractors.com/Ford-7000_Spring_D3NNP733A.html

Says there it's .165" thick (4.2mm), which is a bit more than 2.7. But maybe
that includes the waviness.

 

[Sean in PA]

There are two springs in the clutch pack. If the main spring, which looks like a conventional coil spring were broken then the PTO would not operate correctly. That "wavy washer" spring is called the feathering spring, and if it were broken then it would depend on where the pieces ended up. If the pieces all fell out of the clutch pack and did not interfere with anything, I would suspect that the PTO would continue to operate, but that you would not have as much fine control in feathering the engagement. That is just a guess on my part though, as I have not experienced that kind of failure firsthand.

 

[jwt27]

I always just yanked the handle right up, and as I recall it always engaged
smoothly. I'll pay better attention to what it does next time I use it.

For now I guess all I can do is fill it back up. Hopefully there won't be more
of those pieces floating around.

 

[jwt27]

Just noticed the dual power clutch uses the same spring:

#34 here

I guess it could be that too then. Is the powershift supposed to shift
smoothly? Because on mine it very much doesn't.

 

[Destroked 450]

Dual power unit is on the front of the transmission just behind the clutch
I can t think of a way a broken spring part could get out of the dual power unit and make its way to the rear drain plug
The dual power on mine give a crisp firm shift, depending on to gear and conditions it can be a pretty hard jerk

 

[jwt27]

Okay so dual power must be good then, thanks. Figured the abrupt shifting
might be a symptom if the feathering spring went missing. I reckon it's
probably a smoother experience under high load, which just never happens here.

 

[jwt27]

PTO takes about two seconds to fully engage, so feathering action seems good.

It might be slipping though. I hit a ditch and could hear the mower slow down
quite a bit, but engine rpm didn't drop. Could be the belts but I figure that'd
make some noise.

I do think dual power feels a bit nicer with the new oil.