I sympathize with you on axle failures. I use mine a lot, hence the current nearly 1000 hours, but in no way do I use it full time nor do I use it commercially. While it is nice to know I can potentially go at least another 7000 hours, I won't live that long, inasmuch as I already have 70 some years of experience.
I only have one set of rear wheel weights and it is nice to know that the tractor will accommodate two sets as I have been considering adding another set.
You must really have that box blade weighted down or have a very heavy duty version. I have a cat2 8ft box blade that probably only weighs 600-800 lbs with no additional weights. In tough ground, that box blade and scarifiers will stop my 4066R with R4 tires.
I am guessing that you might be running 4WD nearly all the time, especially if you are using R4 tires as traction can be an issue and that might why you are experiencing so many axle failures. While the 4 series are great tractors and really should be listed as utility tractors, I don't feel they can be considered commercial tractors. I normally only use 4WD when doing loader dirt work or when plowing, which are probably less than 25% of my usage. I am definitely interested in how your 4 series tractors are used.
