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 05-16-2005, 22:29 Post: 111145
beagle

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 Clutch and PTO Independant

I've been having trouble with grinding when engaging the rear and mid-pto's on my B7800. I was adjusting the free-play on the clutch pedal when a noticed that the pto shafts spin even with the clutch dis-engaged. I thought the pto drive shaft was clutched with the TX drive shaft, and the "live" pto was by nature of the hydrostat. Should the pto shafts spin even when the clutch is fully dis-engaged? Not only did this surprise me, but I don't seem to be able to get rid of the grinding, which to me is associated with the immediate shaft engagement.

Any help would be appreciated. I've driven this tractor for almost two years and never realized the shafts where spinning when I clutched, in fact I could swear they didn't. I controlled a PHD all last summer with it.

Thanks for your help.






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 05-17-2005, 07:42 Post: 111152
Murf

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 Clutch and PTO Independant

Beagle, you're right, the PTO should be controlled by the clutch.

The grinding and the PTO shafts spinning seem to indicate that either the clutch is seized up or at least dragging some. Tractor clutches are notorious for freezing in place from rust after sitting idle for a period of time.

You can often get them to release by bumping them with a load on the PTO, with something like the PHD on the PTO and the rev's up near PTO-speed, repeatedly engage/disengage the clutch. This will cause enough drag and friction on the clutch to loosen it and hopefully wear some of the surface rust off the plates.

Best of luck.






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 05-17-2005, 07:58 Post: 111154
beagle

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 Clutch and PTO Independant

Thanks Murf, thought I had lost another piece of my mind. What about the TX drive shaft. If the clutch dis-engages the drive sgaft, could it still be siezed on the PTO shaft. I'm surprised it could be siezed, I used the tractor all winter for plowing, but didn't use the pto at all. Would clutching while pedalling the hydrostat tell me anything. Thanks again.






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 05-17-2005, 09:17 Post: 111160
Murf

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 Clutch and PTO Independant

The clutch disc can slide away from the flywheel on the output shaft but still be stuck to the pressure plate.

This means the TX gears are still spinning and dragging the PTO shaft along with them. Basically the rust converts it back to an old single stage clutch like the old tractors had, the PTO spun until the TX stopped moving also.

If you look in the owners manual I'll bet it says to block the clutch in the disengaged position if parked for any length of time. In fact a lot of my units have a catch next to the clutch pedal so all you do is step down on the pedal and flip the catch to lock it in the down position.

Best of luck.






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 05-17-2005, 09:33 Post: 111162
beagle

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 Clutch and PTO Independant

It sure does Murf, but I didn't think I ever parked it long enough for a problem. The longest it was parked is probably 2 weeks. I'll start banging it around and see if I can get it freed up. Thanks for the help.






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 05-21-2005, 06:50 Post: 111318
Art White



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 Clutch and PTO Independant

Beagle, you might be able to speed things up as far as the loosening by using the drive system. Try just a part load on a hill or grade with the hydro in a higher range at above idle rpm and engaging and releasing the clutch petal.






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 05-21-2005, 08:59 Post: 111326
beagle

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 Clutch and PTO Independant

Thanks Art, I'll give it a try. Obviously the tractor is still under warranty. The problem I have is that nobody will tell me whether this is covered because they claim they have never seen something like this before. If I have the clutch completely depressed, and completely depress the hydro pedal, everything stpd properly including the pto shaft rotation. If I depress the clutch fully, and touch the hydro pedal lightly, I can get the tractor to creep, and there is some pto rotation. It's like their is a bad shaft bearing, and you need extra load to get it to free spin.

What I can't believe is that both the dealer and the regional service rep. can't give me a good idea of what's wrong. My fear is they get the tractor in half, then give me some bull about why this is my fault and hold me hostage to put it back together. My God, I've had garden tractors that I worked harder than I've worked this machine without ever having a problem. I've still been treating it like break-in, and it has 116 hours on it.

Thanks for letting me vent and your suggestions. I am com-pletely disappointed with what has happened with this tractor. I bought Kubota because of the dealer and the reputation for quality. Wondering aloud.






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 05-21-2005, 16:55 Post: 111339
oneace

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 Clutch and PTO Independant

Don't get your self worked up too much yet. This kind of thing happens all the time with every brand. If it is not working right and it is still under warranty you really have nothing to worry about. There is really nothing you can do in 116 hours that they can throw back to operator error. If they want to charge you to fix it trade it in but I doubt you will see a bill.






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