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John Deere Tractors Discussion Forum
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wico xh magneto for JD B.

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Jim

05-06-2004 20:15:36




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When mag is turned counter clockwise spring seems
to pull but will not trip and impluse. Is it the spring or internal parts on impluse.




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RZ(WA)

05-07-2004 18:20:31




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 Re: wico xh magneto for JD B. in reply to Jim, 05-06-2004 20:15:36  
A few years ago I had a Farmall Cub that would start great but after 20 minutes of running it would quit and not start regardless of how many times we pulled it around the shop. Turned out the problem was a weak impulse spring, as it warmed up it would lose enough tension to not allow the impulse coupler to trip fast enough. I've talked to a couple of people since then and each have suggested replacing the impulse spring on any of the older magneto's whenever I come across one. Seems like in the meantime while replacing the spring I have come across minor problems like rust and such similar to what you are finding. Anyway that's another 2 cents for you. Have Fun....

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John T

05-07-2004 05:58:21




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 Re: wico xh magneto for JD B. in reply to Jim, 05-06-2004 20:15:36  
Jim, Im not quite sure what you mean or what happens when you say the spring "seems to pull"

Often what happens is the trip dogs are sticky and never come out to engage and wind the spring at all. Therefore, it never winds up tight and then trips to rapidly whirl the rotor past the coil. Thats CCW facign the rear of mag looking at the coupler assembly. It wont work CW facing the coupler. I assume you mean the right direction???

You can easily see them come out and catch to then wind the spring AND ONCE THAT HAPPENS it becomes way way more difficult to turn. If its about the same turning tension all the way around, they are never engaging n winding the spring, therefore, it never trips.

Use air and WD 40 etc to clean the trip dogs and physically observe if they ever come outward and engage as you can obviously and noticeably feel plus see, then it should be real hard to turn and you can feel the spring tension IF THE SPRINGS NOT BROKE. If so, it obviously wont develop tension and trip n snap even if the dogs engage.

Let us know, Good Luck n God Bless

John T

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Clooney

05-07-2004 03:09:37




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 Re: wico xh magneto for JD B. in reply to Jim, 05-06-2004 20:15:36  
Jim, Duane covered most of it.. I will just add that: In most cases you will have to camp a pair of vice grips or some other grip enhancing mechanism on the impulse cup lugs to be able to turn that mag past the impulse point.. You can do it with your fingers but it is very difficult unless you have strong fingers..

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Duane Larson

05-06-2004 21:39:31




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 Re: wico xh magneto for JD B. in reply to Jim, 05-06-2004 20:15:36  
Jim,
Does the rotor rotate clockwise? If not, the rotor is stuck, and the reasons could be many. If it rotates clockwise, that is good. When rotating counterclockwise, it sounds like the impulse dogs are latching as you feel the spring wind up. Thus, it may be as simple as placing a dab of grease on the impulse stop to help the dog release.

Has the magneto operated correctly in your experience?

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