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post #1 of 19 Old 08-10-2019, 08:37 PM Thread Starter
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PTO Clutch runs when engine runs LX188

Greetings all,

My grandson's LX188 PTO wires got cut, not sure how, but cut or pulled apart. He then took the clutch off and twisted them without solder, taped them up, and mowed a small yard. He said the no solder thing was temporary and he was going to solder or use a splice after mowing a bit to make sure everything worked properly. I looked it over, and he had the wires coming out of the back, which made them run real close to belts. I showed him a picture of proper placement and he changed it. Somehow, after all of this, the clutch spins whenever the lawnmower is running, no matter the position of the PTO switch. At this time, we do not have a deck under it, there is no belt going to the clutch.

Is there any way this is not switch problem? Could shorted clutch wires cause this? I did see him almost drop the clutch and the wires went tight. I thought then that he was lucky it didn't pull one out.

Thanks!

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post #2 of 19 Old 08-10-2019, 09:06 PM
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Re: PTO Clutch runs when engine runs LX188

This is going to be some trial and error....apparently the engine starts with this condition...does it start with the PTO switch in both the "ON" and "OFF" positions?...I would check that first...it is bypassing all the safety switches somehow...I would disconnect the wires again and trace each wire as far back as possible to make sure all the insulation is sound and not coming in contact with chassis .....Taryl has a video on how to repair the connection if the wires do get pulled out
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post #3 of 19 Old 08-10-2019, 09:30 PM Thread Starter
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Re: PTO Clutch runs when engine runs LX188

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Originally Posted by MARK (LI) View Post
This is going to be some trial and error....apparently the engine starts with this condition...does it start with the PTO switch in both the "ON" and "OFF" positions?...I would check that first...it is bypassing all the safety switches somehow...I would disconnect the wires again and trace each wire as far back as possible to make sure all the insulation is sound and not coming in contact with chassis .....Taryl has a video on how to repair the connection if the wires do get pulled out
The mower did not have a safety switch on the seat when it was acquired, and we still haven't gotten around to getting either the proper switch or correct seat. But, it worked normally for quite a while in the same condition it is in now. If a clutch wire going to ground could make it run, I suspect that could be it, he did tie it off to the frame in a few spots. I'll have to check tomorrow, as it is dark with a lot of bugs/mosquitos outside, so we try to keep from opening doors at night. Thanks for the clues, and yes I did see Taryl's excellent video on how to repair the connections. Love his videos!

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post #4 of 19 Old 08-11-2019, 04:42 PM Thread Starter
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Re: PTO Clutch runs when engine runs LX188

I personally fixed the splices, inspected, and then put a sheath around the whole cable, but it's still the same problem. I did this while lying on the ground because I could not get the connector apart. I'm thinking there should be a tab on it to press, but there's not.

EDIT: I did get the cables unplugged. Now I can get to it better and hopefully test it.

Last edited by GrampsTed; 08-11-2019 at 04:57 PM. Reason: Situation changed
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post #5 of 19 Old 08-11-2019, 05:14 PM
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Re: PTO Clutch runs when engine runs LX188

I'm not a JD guy, but wonder if the hot wire shorted to ground and fryed something in the safety circuit? These have been becoming increasingly more complicated and expensive to fix. Do you have the one with a circuit board as part of the key switch?

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post #6 of 19 Old 08-11-2019, 05:26 PM Thread Starter
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Re: PTO Clutch runs when engine runs LX188

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I'm not a JD guy, but wonder if the hot wire shorted to ground and fryed something in the safety circuit? These have been becoming increasingly more complicated and expensive to fix. Do you have the one with a circuit board as part of the key switch?
I don't believe mine has a board, but I'm not positive. I just metered the switch and got 12.7 at the connector with switch on, and 0 with switch off. I then checked the PTO clutch and got 3 ohms across it, and also checked each PTO clutch lead against the clutch casing and didn't get anything.

EDITED to change from not knowing, to now believing 3 ohms resistance is a good thing. So, I believe that part of the PTO clutch test is okay. Also, I have read that there is no polarity involved.

Thanks for your reply!

Last edited by GrampsTed; 08-11-2019 at 05:37 PM. Reason: New information
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post #7 of 19 Old 08-11-2019, 10:47 PM
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You have a circuit board as part of ignition switch. Is the blue wire hot all the time at the PTO connector?

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post #8 of 19 Old 08-13-2019, 04:46 PM Thread Starter
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Re: PTO Clutch runs when engine runs LX188

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You have a circuit board as part of ignition switch. Is the blue wire hot all the time at the PTO connector?
I get nothing out of the blue wire when I go across it to frame or battery ground in any key position with the exception of a 0.06 volts when tractor is running and PTO engaged.

Going across both black and blue on the PTO connecter when engaged is battery voltage, but only when PTO switch engaged and engine running.

Seems that might be the norm, only 12 volts when engine running and PTO switch engaged. If so, seems to me it would be pointing back to something faulty somewhere with the clutch?

Thanks!

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Last edited by GrampsTed; 08-13-2019 at 04:52 PM. Reason: Question
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post #9 of 19 Old 08-13-2019, 07:53 PM
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Re: PTO Clutch runs when engine runs LX188

Without knowing much... Is it always turning the pto, even when a mower is hooked up? I could see it possibly spinning without a belt hooked up. And that maybe with the belt, it wouldn't.

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post #10 of 19 Old 08-13-2019, 08:06 PM
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Re: PTO Clutch runs when engine runs LX188

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Without knowing much... Is it always turning the pto, even when a mower is hooked up? I could see it possibly spinning without a belt hooked up. And that maybe with the belt, it wouldn't.
I wondered the same thing. Without a belt, there's no drag to keep the pto pulley stationary when the engine is running, so why wouldn't it just go along for the ride?

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post #11 of 19 Old 08-13-2019, 09:02 PM Thread Starter
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Re: PTO Clutch runs when engine runs LX188

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Without knowing much... Is it always turning the pto, even when a mower is hooked up? I could see it possibly spinning without a belt hooked up. And that maybe with the belt, it wouldn't.
I've thought the same thing, guys. If it weren't so hot out there today, my grandson and I would have gone ahead and put the deck back under it. What's throwing me off, is I hear and see no change in it while engaging and disengaging while running. I'm almost certain that I have heard it engage before with the belt off. I'm going to try that coming up. Hopefully tomorrow morning I can round my grandson up to do that.
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post #12 of 19 Old 08-13-2019, 09:39 PM
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Re: PTO Clutch runs when engine runs LX188

So it sounds like electric is working. Did your grandson put it on upside down. If not Id Also Remove clutch its easier to work on and diagnose on bench. If I was going to guess Id check air gap between driven flex clutch plate and drive magnet its adjusted by the 3 1/2 nuts. .020 feeler gauge. To set gap

Id also check if clutch was dropped it might not be straight causing clutch to stay engaged


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post #13 of 19 Old 08-13-2019, 10:33 PM Thread Starter
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Re: PTO Clutch runs when engine runs LX188

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Originally Posted by groomerz View Post
So it sounds like electric is working. Did your grandson put it on upside down. If not Id Also Remove clutch its easier to work on and diagnose on bench. If I was going to guess Id check air gap between driven flex clutch plate and drive magnet its adjusted by the 3 1/2 nuts. .020 feeler gauge. To set gap

Id also check if clutch was dropped it might not be straight causing clutch to stay engaged


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I just got off the phone with him and he said that he did get it bound up by not getting the stop that keeps it from turning, in the hole, and tightened it against the top of the clutch. He said he noticed it before fully torqueing it. I didn't notice anything looking bent up on it, and also watch it whirl, with nothing wobbling. Hopefully it just needs adjustment. I'll know tomorrow morning early. Thanks!
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post #14 of 19 Old 08-14-2019, 12:20 AM
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PTO Clutch runs when engine runs LX188

https://ogura-clutch.com/downloads/PTO_for_web.pdf

This will help you understand pro clutch.

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post #15 of 19 Old 08-14-2019, 12:27 AM
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Re: PTO Clutch runs when engine runs LX188

Page 21 is troubleshooting clutch wont disengage


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