I used to work at a farm that had the same tractor, same year if I remember correctly. Cab, loader and 8x8 hydraulic shuttle shift transmission. It had over 2,000 hours in the 7 years I ran that tractor. We ran a John Deere 430 round baler the last couple years I was there. Baled about 1,000 4x4 bales a year. No problems running the baler. It would pull a 5 shank Brillion Disc Chisel about 8 inches deep in sandy loam soil, heavy corn stubble and rye stubble. It knew it was back there, mainly because the tractor was on the light side, so traction was a little bit of an issue but not enough to keep it from moving forward. The rears wheels were the heavier cast wheels and were also loaded with rimguard. It could pull a 14ft disc, but would get bogged down in sandier soils if it sunk to the disc axles. We pulled a 3-16 bottom plow with it no problem. Lift capacity on the loader was around 3,000lbs if I remember correctly, more than anything we needed it for. Visibility was pretty good, although it could be a little tricky switching from bucket to forks. I suggest putting some high viz tape in the center of the bucket/forks and the torsion tube on the loader to help line things up. We used a 7ft Land Pride flail mower with it, and as long as you went slow, it could handle anything. More of a praise for the mower than tractor really, that thing would chew up rock with the hammer teeth. Never broke a tooth in 7 years. It ran a 7ft New Holland flail crop chopper without issue chopping corn, grass, and other forages.
The issues we had were few. The biggest problem we had was the camber on the front tires was such than one of them would wear the outside of the tread way faster than the inside. I can't remember which side it was, but it was noticeable that the tire was leaning out further than the other side. Toe in was in spec, tie rods and bushing were fine. We replaced that tire twice before we replaced the other side. It didn't affect performance that we could tell so we just ran it.
The steering would act funny sometimes. It would be smooth as butter and then all of a sudden start to groan a bit and get a little difficult to turn the steering wheel. The dealer came out and tested the pump, I think they actually replaced it, but it still did it. Nothing ever developed worse, so it seems like it's just something it does.
Some people complain about the Regen on the Kubotas, and it does happen more frequently, especially on those earlier Tier IV and interim machines. It would happen every 8-14 hours depending on the time of year and how we used it. If it needed to do a Regen and what we were doing needed some finess, i.e. loader work, lots of stop and go, we would just park it, rev up to 2,000rpm and let it do it's thing. You could hear the change in sound very easily when it was finished. If the engine was cold and it was cold outside, it would take about 30 minutes. If the engine was hot it would take about 20 minutes. A pain for some, but not as bad as other tractors from what I've read.
The loader joystick cables needed adjusting after about 1500 hours and did seem to develop more play at around 2,000 hours even after another adjustment. The draft control lever got very difficult to move due to lack of use. There is a little cover where the lever attaches to a shaft in the back that you can take off and spray some lube to keep things moving. I suggest doing that frequently.
Paint fades in the sun, it is a Kubota after all. The windshield washer tank got brittle and was replaced. The frame that the oil cooler slides into in the front needed replaced after 1,500 hours as it rusted out. O-rings and those little white plastic washers in the rear remotes were replaced after about 1,000 hours. The roof was attached wrong out of the factory and had too long of a bolt installed that stuck out through the roof causing leakage, but was replaced under warranty. The seat would bottom out if you hit some big bumps, but that's not too unusual.
One thing to keep in mind, which was an issue with the prior 40 series (8540,9540), we had a 9540 that needed the PTO brake replaced at about 1,200 hours. Kubota fixed the issue with a heavier PTO brake with later serial numbers. The only reason I mention it is the 40 and 60 series share a lot of the same parts. I'm not sure if the PTO brake is the same in the 9540 and 9960, but it might be worth looking into. It requires splitting the tractor. We didn't have the means to split such a large tractor and had the dealer do it. I believe it cost around $4,000.
Overall, a great tractor that was easy to work on and had very few problems.