dave1949
Super Star Member
This little bugger -
It's the vent for the rear axle housing. It's up under the seat near the pressure-relief valve for the hydraulic system/3PH.
I found that the little rubber vent tube had deteriorated and had partially crumbled apart ... to the point that there was a vertical path into the rear axle for water to get in.
If you have a tractor that is older (ours is 10+ years) I'd suggest looking to see if you have one these somewhere up under the seat and then inspect it's condition.
Good catch, it sounds logical. I'll have to look and see if there is one on my 2003 NH somewhere.