voltage

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jsheedy34
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voltage

Postby jsheedy34 » Wed Jun 07, 2017 8:31 pm

I recently purchased a International Cub, and I'm not sure of the year, I think it is around a 1958. it has an emblem on the hood INTERNATIONAL CUB, and a vertical emblem by the radiator LO BOY. Is it a 12 volt?. Also I was removing the sediment bowl (not getting gas to the carb.) when the coil exploded (sounded like a shotgun) and burst into flames. it blew the end off the coil and blew oil everywhere. What would have caused this? I can't locate the serial no. plate. Your help will be much appreciated.

tst
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Re: voltage

Postby tst » Wed Jun 07, 2017 10:09 pm

welcome to the forum, the cub you described is 6 volt POSITIVE ground from the factory as long as someone in the past did not convert it to 12 volt, coils do go bad when they get old, once in a great while they can go boom, not common, buy a new coil with an internal resistor, serial # plate is held on by 4 rivets at the bottom of the steering column, some people have pried them off, you can also ID it with casting codes

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Re: voltage

Postby Eugene » Wed Jun 07, 2017 10:54 pm

Welcome.

Even if you had a 12 volt battery in a 6 volt ignition system, the coil should not have exploded.

Couple of causes, ignition system was left in the on position for an extended period of time. Or there was an electrical short keeping the coil energized, but if that were the case, the tractor wouldn't shut off if running.

Check the generator, if the tractor has one, black ID label = 6 volts, red label = 12 volts. Alternator, generally 12 volt system.

I have had one battery explode, but never a coil. I have seen a few expanded/deformed coils.
I have an excuse. CRS.

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Re: voltage

Postby Glen » Thu Jun 08, 2017 1:18 am

Hi,
Below is a page from the Cub owner's manual showing where the serial number plate, and the engine serial number are.
Next is the 1957 LoBoy owner's manual. The experts on here recommend the people read it if you never have. It has much info about operation, maintenance, and lubrication.
If there is no serial number plate, below is info from TM Tractor for locating and reading the casting codes, cast into the tractor when the parts were made. :)

http://farmallcub.com/rudi_cub/www.clea ... e%2002.jpg

http://farmallcub.com/rudi_cub/www.clea ... index.html

http://www.tmtractor.com/id/castdate_loc.htm

http://www.tmtractor.com/id/id_004.htm

jsheedy34
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Re: voltage

Postby jsheedy34 » Thu Jun 08, 2017 7:28 am

It wasn't running when I purchased it and their wasn't a battery in it. I had an old time tractor mechanic get it running and he put the 12 volt battery in it, it was starting and running fine until the fuel line plugged up, It has a generator on it, so I'm not quite sure if it 6 volt or 12 volt. What would the best way to find out if it should be 12 or 6? Thanks!

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Re: voltage

Postby staninlowerAL » Thu Jun 08, 2017 7:49 am

Info from Raymond Durban's data base post show the following in 1964 for tractor SN 224401, engine SN after 245860:
First 12v Cub (SN skip? 224286 last 6v Cub?), Starter Switch moved to Dash Panel, Battery Box Cover changed from 4 hold-downs to 2
If you don't have a data plate on the bolster under the steering shaft, check the major parts casting codes to determine month/date and year built. I'm betting unless someone change it yours should be 6v from the factory.

jsheedy34
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Re: voltage

Postby jsheedy34 » Thu Jun 08, 2017 8:03 am

Thanks much for all the info. but if the 12 volt battery was installed in error. would it start and run without damage? Would that be a reason for the coil to explode?

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Re: voltage

Postby Crimson Tim » Thu Jun 08, 2017 8:55 am

jsheedy34 wrote:It has a generator on it, so I'm not quite sure if it 6 volt or 12 volt. What would the best way to find out if it should be 12 or 6?


Eugene has you covered.

Eugene wrote:Check the generator, if the tractor has one, black ID label = 6 volts, red label = 12 volts. Alternator, generally 12 volt system.


Unless it's been painted over...

And yes, you can use a 12V battery on a 6V starter. It won't fry for short bursts. Just don't let it crank very long before letting it cool. As far as actually running... it depends on your electrical system's specifics, and I'll let the guys who are good at that continue to address that specifically to your tractor. On earlier tractors, the start circuit and the run circuit were entirely independent.
Some pictures of your generator and other ignition components will likely help them analyze and diagnose.

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Re: voltage

Postby Matt Kirsch » Thu Jun 08, 2017 10:48 am

More than likely, it is a 6V electrical system. While not unheard of, it is uncommon for someone to do a 12V conversion with a generator and regulator. Most conversions are done with alternators.

Did you leave the ignition switch on while you were messing around with the sediment bowl? If so, that is why your coil exploded. Coils need to be discharged by creating sparks at the spark plugs, or they get very hot very quickly. Especially if you are feeding a 6V coil 12V for an extended period of time.

The tractor will start and run just fine with a 12V battery, but it will not charge the battery with the existing generator system. You will need a new 12V coil that is marked "no external resistor required" if you want to continue to use the 12V battery. To make the battery charge you will need to replace the generator with an alternator.

If you want to go back to the original 6V system, you will need a 6V battery and a 6V coil. The existing generator MAY charge the battery, but quite often these systems need some maintenance to get them working again. It would be an extreme stroke of luck if the generator worked "out of the box," but don't fret if it doesn't. Nothing you've done has caused any damage/problems.

jsheedy34
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Re: voltage

Postby jsheedy34 » Thu Jun 08, 2017 11:30 am

I think I did leave the ignition button out.(my bad) I have a new 12v coil on order, but I will probably wait on replacing the generator. The battery will just go down under the present system right? no other issues. I am replacing the lights with 12v. Any other concerns?

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Re: voltage

Postby Shane Nelson » Thu Jun 08, 2017 11:40 am

Get you one of these mini alternators and be done with the charging system if your going 12V on lights and everything else. It's a simple one wire hook up and done.

https://www.dbelectrical.com/products/c ... 12180.html
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jsheedy34
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Re: voltage

Postby jsheedy34 » Thu Jun 08, 2017 12:44 pm

My Thanks to all the informative reply's. Great help!


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