I don't have an N owners manual here so can't say what the specs are for them.
I do have a 3 cylinder 2/3/4000 owners manual and in it they give maximum weights for those tractors.
On a 2000 rear axle which is the lightest of the 3 they give the max rear ballast - including cast iron and fluid as 2300 lbs total.
Now a 2000 rear axle is significantly heavier than an N or Jube and IMO the splined axle/hub configuration is not as robust as a solid axle would be. I suppose if you aren't ram rodding your tractor - and - if you keep the big nuts on the end of the axle tight you'd be ok. But over ballasting should be a consideration.
Don't get me wrong here as I am a big fan of ballast. Without it you can NOT put full horsepower to the ground. Plus, adding ballast makes your tractor more stable on side hills, etc.
HTH
Jerry
Edit: I don't think you'll hurt the gears much on an N by over ballasting. They are probably plenty stout for your 30+/- hp engine.
On a Jube with the 42+/- Red Tiger engine but the same rear end it might be a factor.
This post was edited by Ultradog MN at 08:07:31 11/09/12.
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