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Craftsman 917.258872 Electric Pto Problems


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#1 Bolens 1000 ONLINE  

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Posted July 20, 2012 - 08:54 AM

A neighbor asked me to take a look at his craftsman tractor model 917.258872
The problem is the Electric PTO clutch will not disengage and the blades are spinning constantly. The tractor will not turn over when the PTO switch is turned on so that makes me believe the switch is fine.
After numerous testing I decided to remove the wires that go to the PTO and see if it would stop turning. I turned the key and the PTO was still on eventhough I had disconnected the wires to it.
I'm guessing there is something seized/ stuck in the pto itself.

Anyone with more experience with these electric clutches have any opinions ?

#2 bhts OFFLINE  

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Posted July 20, 2012 - 09:17 AM

Doc, I would say you are on the right track. It may have a frozen bearing and stuck to the crank. I would remove it to see what is going on.
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#3 Bolens 1000 ONLINE  

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Posted July 20, 2012 - 09:26 AM

Anything I should know before taking it apart? Are they pretty simple units? I never had one of these apart before...

#4 bhts OFFLINE  

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Posted July 20, 2012 - 09:36 AM

Really straight forward to remove from tractor. Once it is off the tractor you will be able to tell if the bearing is stuck. As for taking the clutch apart it can be done. I would guess that the bearing is staked into it and is a real bear to change but can be done. Once it is off you can remove the pulley by prying and twisting it off the base and is a good time to inspect the coil. If you get it apart and fixed you do not need to gap the clutch on this one as it is set once you put it back together. If you have any questions feel free to give me a shout on the phone as it is easier to explaine that way at least for me LOL.
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#5 KennyP ONLINE  

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Posted July 20, 2012 - 09:39 AM

Good luck with the repair. Post some pics for those of us who need enlightenment!

#6 HDWildBill ONLINE  

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Posted July 20, 2012 - 10:49 AM

Yes please do keep us posted on this Doc. I have an electric PTO on mine so this would be a good education for me.

#7 Bolens 1000 ONLINE  

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Posted July 20, 2012 - 11:00 AM

I probably wont get to work on it until early next week.
I'll be sure to post an update.
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#8 EricFromPa OFFLINE  

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Posted July 25, 2012 - 01:49 PM

They can be a bugger to get off.Especially if the bearing seized.
It most likely will need Heated to get it off if the bearing overheated and siezed.
Wich really sucks because the field coil is incased in plastic.

Posted Image

Here is a pic that may help.


Edited by EricFromPa, July 25, 2012 - 01:54 PM.

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#9 Bolens 1000 ONLINE  

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Posted August 04, 2012 - 04:41 PM

Here's an update, I went back to look at it and found that the bearing has seized to the shaft which explains why the PTO wouldnt turn off.
I'm bringing it home Monday to work on it. Hope I can get that PTO off without too much trouble......




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