MTD will not shut off. - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
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post #1 of 11 (permalink) Old 09-22-2020, 10:48 AM Thread Starter
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MTD will not shut off.

Yard-man/MTD with 179 cc powermore engine Electric start.

This guy sat for the better part of 2 years before I got my hands on it. No blade when I got it and the adaptor was heavily rusted. I replaced the adaptor, and I had a blade.

I replaced the stop switch assy (I think I got the last one in the captivity), and replaced coil/magneto.

Starts fine. Couple of pumps on the primer.

Let go of the bail and the engine will slow somewhat, but will not shut off.

I have tried connecting the 3 terminals on the stop switch in every combination.

Needless to say I'm almost ready to admit defeat.

Thanks for any ideas in advance.
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post #2 of 11 (permalink) Old 09-22-2020, 01:45 PM
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You've been in under the 'hood', but the last time (and first) I had a mower that wouldn't shut off it was a mouse nest keeping the shorting system to the spark plug from moving all the way over. I believe that's what you're referring to by 'stop switch assy' which you've replaced. If you've tested that for continuity - two states, open and closed, I wouldn't know where to go next. Good luck.

Last edited by Joe Kuhn; 09-22-2020 at 01:51 PM.
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post #3 of 11 (permalink) Old 09-22-2020, 06:20 PM
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Hello Mike. Here is a link to the MTD vertical shaft motor service manual. The starter and ignition sections begin on page-63. You could have a faulty brake switch or the wiring is wrong.

http://service.mtdproducts.com/Train...ert_manual.pdf
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post #4 of 11 (permalink) Old 09-23-2020, 12:21 PM Thread Starter
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Originally Posted by Grunt View Post
Hello Mike. Here is a link to the MTD vertical shaft motor service manual. The starter and ignition sections begin on page-63. You could have a faulty brake switch or the wiring is wrong.

http://service.mtdproducts.com/Train...ert_manual.pdf
Thanks for the link. followed all the test procedures outlined in the service manual, and no joy.

I'm really at a loss. I even put the original coil back on, and same thing.

Anybody got any suggestions?
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post #5 of 11 (permalink) Old 09-23-2020, 12:32 PM
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You tested the stop switch as shown on p. 67-69?
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post #6 of 11 (permalink) Old 09-23-2020, 03:11 PM Thread Starter
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yes, but i'll doit again and report back. I will test both-new original switch and thee new one

Tested switch again and still no joy. I thisk 1/4 pound of C4 would fix it.

Last edited by Mike Cowan; 09-23-2020 at 04:17 PM.
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post #7 of 11 (permalink) Old 09-23-2020, 04:58 PM
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Mike, you're on the verge of discovering something new. Hang in there. It will be worth it. Sleep on it. Leave it and come back. It'll come to you. There's ALWAYS a reason. You've just got to find it. You will find it.
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post #8 of 11 (permalink) Old 09-24-2020, 12:16 AM
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Also remember that sometimes it is hard to see the forest for all the trees getting in the way. Which translates to sometimes the simplest things are the hardest to find the cause and solve.
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post #9 of 11 (permalink) Old 09-24-2020, 08:01 AM
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Mike, one thing you can do is to describe in your own words how you tested the shut off system. You can do that here or on a piece of paper, or tell somebody about it. That might help you see something. If you post it here, that might help us see something, but it's certainly not required to solve this one.
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post #10 of 11 (permalink) Old 10-04-2020, 11:19 AM Thread Starter
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Fixed my problem.

Made my problem someone else's problem.

And broke even on the deal.

Sold said lawn mower. it no longer sits in the garage mocking me.
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