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I will guarantee that for 10X the price I would not even consider a genuine Kubota pump. Dan

Engineers seldom build to minimums. I dont think you will find many engineering drawings with tapped hole depths at less than 1D. Those shallow deprhs would be used when some other feature interferes with the hole or its a through hole in a thin wall. Returning to the subject of oil pan drain...

Which is why standard engineering practice is 1D to 1.5D length of engagement. An engineering professor explaining the nuances: https://mae.ufl.edu/designlab/Homework%20Assignments/Good%20UNC%20vs%20UNF%20threading%20answer.PDF Dan

Or possibly a few of the parts outside that circle. I think I would have a good hard look at 120, 150, and 40 through 60 before popping the top. Dan

The shaft seal is not designed to handle full pump hydraulic pressure. Those pressures are contained by the wear plates and seals inside the pump. When the internal parts in the pump wear the shaft seal is exposed to the higher pressures that start leaking past the sealing surfaces inside the...

Or for those wuithout a handbook their 9th grade geometry textbook. Fine threads have a longer helix length which offsets the reduced cross sectional area of an individual thread by putting more total cross sectional area in shear. In practice that principle, just like length of thread...

Looks like a tamper proof cap to me. In other words: "Keepa yo Hands Offa da Idle Speed screw" Dan

Apparently I was not explicit enough. Quit throwing parts at the old cylinders. Replace them both with two brand new cylinders for $438 delivered and be done with it for another 20 years. Dan

The lowering speed vàlve does just one thing. It chokes off the hydraulic path that allows the lift to lower If you close it all the way that path is completely blocked and lift position control vslve cannot do anything to open it. It is not the problem - leave it open. So with this latest...

Really high tech. Electrical tape from Amazon :D Dan

OK - then this will be two in three years. It does not change my thinking. Dan

Three seal replacements in as many years? This is an aftermarket replacement cylinder. Note price and dimensions. https://www.hydrauliccylindersinc.com/product/replaces-kubota-la703-bucket-tilt-cylinder/ A near perfect mstch for the OEM dimensions at a considerably lower price...

An obstructed exhaust (DPF) would be consistent with the symptoms. Dan

Nothing special - JFYI. . This is an OTS Magister 2 x 14 cylinder and seems to be a perfect match for my L3901. Does require 1 x 3/4 reducing bushings at both ends. Expect it will also work on the other L01s. My first experience with a hydraulic top link and I am already spoiled. Dan

Everything as normal except your comment on the lowering speed valve. You start by saying valve is open and then you say it won't lower unless you open it. That is contradictory. Was the test run with the lowering speed valve open or closed? It should be run with the valve open. Need a much...

Real simple test. Raise the 3pt conyrol lever in stages,: 1/4 up and stop = what happens? 1/2 up and stop - what happens? 3/4 up and stop - what happens?

The stripped thread can be repaired with a thread repair insert (AKA Helicoil). It is utter fsntasy to characterize that repair as a modificstion that would void any warranty. The original threads are standard metric screw threads and never functioned as a liquid tight seal. A sealing washer...

Then go for it. Personally I would visually verify the spool is sticking BEFORE taking the valve apart. Dan

That does not look the sane as tje first video. In the first video it seemed like the 3pt struggled to raise and in this one ot looks smooth. I cant see what the linkage is doing but it sure seems like the feedback is out of adjustment snd when the 3pt gets too high at the top something in the...

And it behaved the same at all settings? If the position control linkage is connected and working the 3pt should have completely stopped lifting al one extreme. Dan