Not sure if anything has been mentioned about the Yanmar tractors, but an older used 4wd unit can be found with a front loader for between $6K and $9K. Sometimes they can be found on Tractorhouse.com, but often times it takes contacting an importer.
Have you considered siping them with a tire lug cutter (heated blade)?
I would've preferred the wide tread R1 fronts (I think they only come on 6 series from the factory), but having jammed wood between the rim and bead in under 2 hours of ever bringing a tractor to my property with r1 fronts - I'm liking the rim protection of the r4's at least in theory for now.
You could get another set of wheels/tires if you had work for the r1's that your r4's weren't performing satisfactorily. I'm talking used tires with life left.
Gregg
I finally sold my 1950 8N about a year ago after enjoying it for 34 years. I now have a little Deere with loader and 4WD. I sure wish I would have found a way to do it sooner. An old dude like you could find unimaginable chores easily done with a loader.
Heck, I could have used a front loader many a time when I was younger too! LOL I bought that 8n in 1998, with the plan on doing a full restore on it. Well, I started using it more and more all the time for various tasks. Then there was the problem of money, time, and the ambition to start such a project. I doubt I will ever get rid of it. Great small tractor for what I do with it.
Gregg,
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