I picked up my L4701 tractor with FEL and Backhoe this past Saturday from the dealer in Danville, IN, after they called to say it was ready. The good people at this particular dealership contacted Kubota in Groveport, OH, after I had my tractor dropped off on May 30th. At the dealership's request, Kubota finally sent over 3 technicians from Groveport to tear into my tractor, along with the dealership’s mechanic.
My L4701 was showing 3,200 psi at the tractor relief valve but after just a short period of time the backhoe was losing 1,200 psi, causing it to not pick-up a load of dirt, the struts/stabilizers to drop in a matter of minutes, and the thumb on the BH to start dropping almost immediately.
It's my understanding that after every possible diagnostic, the technicians from Groveport, along with the Team at the dealership in Danville, IN, removed the new valve from the backhoe (this was replaced back in Dec, 2016). What they found as the causal was paint overspray on the section of the valve where it makes contact with the backhoe. Although external leaks were not found themselves, the overspray paint was just thick enough to cause internal leaks, and the hydraulics to work against themselves.
Once they cleaned the factory paint off of the valve where it makes contact, they reinstalled it. Now the pressure holds steady, and after 2 hours of use, none of the problems that I experienced since I purchased the tractor new almost 2 years ago (July 3rd, 2015, from a different dealer) have reoccurred as of yet. I’m also not having hydraulic issues with the FEL either (i.e. the tractor would die when I tried to pick up a half load of sifted top soil with the front-end loader), which I never focused on as much, since it was the lesser of the two problems; I needed the backhoe most of all, which is why I purchased the tractor in the first place.
So as of this post, and after 6 separate service trips in less than 2 years to two different dealerships (4 months total shop time), my tractor is working, including the Backhoe, the Struts/Stabilizers on the BH, the Hydraulic Thumb on the BH, and the Front-end Loader too. Again, I've only used the tractor for 2 hours since picking it up this past weekend, but I would say there is a very good chance that the primary issue/causal has been resolved.
My experience with Kubota these past 23+ months has been nothing short of deplorable (and I’m being extremely generous). As a corporation, they overwhelmingly didn’t listen to or believe me. However, the dealership in Danville, IN, stood above it all, helped me when I didn’t even buy the tractor from them, exercised remarkable and extreme professionalism these past couple of weeks/month, and figured out/fixed my problem – for that I can’t thank them enough for what they have done for me, because that’s all I wanted all along. I also greatly appreciate everyone’s help and advice on this board, you kept me sane throughout it all.