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51 8N Electrical problem

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Jennings Almond

08-19-2000 14:01:36




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I currently use a 51 8N (that my grandfather bought in 51) to bush hog a considerable amount of grass. By and large this has been a tough as nails tractor, and generally I have been able to solve most maintenance and repair problems myself. I now am stumped. While I was bushogging in a pasture lane last week, the tractor made a squeeling sound and stopped. After that, when I tried to start it it would just click and barely turn over. I also noticed that there was a small trail of smoke coming from the back terminal of the relay. I have removed the battery; charged it, and replaced it. I have also replaced the relay that sits on top of the starter. When I try to start it now it turns the engine over, but slowly, and the rear terminal of the new relay starts to smoke again. I installed a new starter two or three years ago.

I live in a small town dominated by the John Deere dealer. There few Fords sold here, and the local dealer has become quite independent. They treat you like they are doing you a favor to work on your tractor, and will never give you a specific time when they can come and fix your tractor. Also, today I went to the Ford dealership locally at 11:24am and they were already closed (the hours on the door stated that they would be open until noon). So, I like to fix what I can and give them as little business as possible.

Can anyone help.

Thanks,

JA

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Claus

08-19-2000 14:13:29




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 Re: 51 8N Electrical problem in reply to Jennings Almond, 08-19-2000 14:01:36  
Assuming you still have a 6 volt positive ground, get a jumper cable and connect one end to the negative terminal on the battery. Make sure tractor is in neutral and ignition key on. Touch the other end of the jumper cable to the copper strap that comes out of the starter that goes to the starter relay. With a freshly charged battery the tractor should turn over briskly...and start. Make sure that you have the correct starter relay on your starter. This relay is not like most automobile starter relays. The high side of the coil is connected internally to the fat bat terminal. The relay is engaged by making a ground at the rear terminal.
Happy Motoring
Claus

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ZANE

08-19-2000 14:12:30




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 Re: 51 8N Electrical problem in reply to Jennings Almond, 08-19-2000 14:01:36  
You can get that relay at most any auto parts store for less than at a dealership.

You need to know what made the squeeling noise????
It could be that the generator is trying to lock up because of a bad bearing etc. You can get the generator at the auto parts store too. Rebuilt or new.

You can jump it off with 12 volts from a car etc. by folling these directions. When jump starting an N tractor with 12 volts it not necessary to hook the 12 volts to the 6 volts battery at all. As a matter of fact I strongly reccomend against it.
Instead hook the 12 volts directly to the frame of the tractor for the ground and with the transmission in neutral and out of the way of the wheels of the tractor so you don't get run over touch the other cable from the 12 volt source to the post on the starter.
By doing it this way you don't even have to worry about the polarity of the batterys or which cable you have to ground or positive to the frame or the starter as the 6 volt systme is not intered into at all with the 12 volts. Just turn on the switch and touch the hot cable to the starter post and it will go.

Watch the oil pressure when it starts to make sure that the squeeling you heard was not the crankshaft.

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