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Subject: 3 brush generator

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Dennis    Posted 09-23-2020 at 22:47:16 [URL] [DELETE]        [Reply] [Email]  
  • 3 brush generator
  • I had a 3 brush 6 volt generator rebuilt , new fields and armature. Left tractor idle for 15 minutes without wire hooked to it while I flushed out the cooling system. The field overheated melting all the wax out of the vent hole. Repair shop said it was my fault for running it without being hooked up that's why it over heated. Is this correct?

    Tim Daley(MI)    Posted 09-25-2020 at 12:04:22 [URL] [DELETE]        [Reply] [Email]  
  • Re: 3 brush generator
  • Dennis-
    Here is what JMOR said in more technical detail:

    " Being a 3 brush, the generator supplies it's own field current & with no battery connected, it can output ~18 volts (no load) and this amount of voltage will produce excessive current in the field coils for sure and maybe in armature. I'll call the generator shop correct on this one.

    Here is the real irony of it.........if he had shorted the armature to ground, then there would have been no 3rd brush output to the field, thus no armature output & it just spins freely & cool in the bearings! These three brush units are current self-limiting and is why they could use simple cutout with no current regulator. "

    I again have to ask why on earth would you have your genny rebuilt, mounted, and then not attach the cable? You also could have just not had the fan belt fastened and it wouldn't have done any damage as well but then no fan belt means no water pump and thus no radiator flushing, overheating, and more problems.

    Now you will have to have your starter shop guy rebuild your genny once again. I have an OEM 2N-10000 Generator rebuilt to original specs and all set to mount. It includes the OEM Generator Belt Tensioner. My email is open if you wish to discuss further.


    Tim Daley(MI)

    Tim Daley(MI)    Posted 09-24-2020 at 06:00:46 [URL] [DELETE]        [Reply] [Email]  
  • Re: 3 brush generator
  • HiYa Dennis-
    HHHMMM.. why didn't you connect the unit before running the tractor? If it wasn't wired up, how did it get hot and melt? How did you cause the melting? Is it the 9N/2N 1-Wire/3-Brush unit with cutout or the 3-Wire/3-Brush 8N unit with the Voltage Regulator? I have some OEM Ford Tractor generators rebuilt to OEM specs and all ready to use - email is open.

    Tim Daley(MI)

    Dennis    Posted 09-24-2020 at 08:53:03 [URL] [DELETE]        [Reply] [Email]  
  • Re: 3 brush generator
  • It's the 9N 1-Wire/3-Brush with cut out unit. I changed oil and filter and flushed
    out the cooling system and needed to move out of the driveway so it ran about 15 minutes without the 1- wire being hooked up. When I went to hook it up it was very hot and the wax had run out of it. The generator repair shop said you can't run it without being hooked up.

    JMOR    Posted 09-24-2020 at 23:46:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 3 brush generator
  • gen repair shop is correct.

    Dennis    Posted 09-26-2020 at 22:59:26 [URL] [DELETE]        [Reply] [Email]  
  • Re: 3 brush generator
  • Repair shop replaced the fields again and it works perfect. a $ 55.00 lesson
    you can't run this generator without being hooked up.

    JMOR    Posted 09-27-2020 at 10:15:22 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 3 brush generator
  • Happy that you got it working!

    Tim Daley(MI)    Posted 09-28-2020 at 06:42:27 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 3 brush generator
  • Chalk it up to "lessons learned", expensive but then they usually always are. We all have gone thru similar mistakes. Now you know.

    Tim Daley(MI)

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