Generator repair ?

Posted by jCarroll on May 01, 2007 at 12:03:46 from (4.131.33.151):

To allow access for another fix-it job, I removed the generator
from my 1956 John Deere 420W (6v, + grnd, 2 brush generator).
Thinking this would be a good time to check the generator, I test
motored it by grounding the frame to the + post, and jumpering
the - post to the A terminal. The generator motored about 80
or 90 rpm, and I thought that's kind of slow, so I'll tune-up the
genny.
I cleaned it, put in new brushes and a pulley bearing, cleaned
the commutator, and undercut the mica.
Put 'er back together, and tested for motoring like above, and it
only drew a spark. I additionally grounded the F terminal, and it
ran 300-400 rpm.
Now the question:
Does the F terminal have to be grounded for the motoring test?
If YES, how did it run when I first took it off the tractor?
If NO, why did I have to ground the F terminal to get it to run
after repair?

Replies:

• Re: Generator repair ? Bus Driver 13:03:13 05/01/07 (0)
• Re: Generator repair ? John T 12:47:55 05/01/07 (0)

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