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I think the only thing you will find under that plate is an O-ring 🙂 Dan

He can run the 3pt splitter he already has directly off the L3902 hydraulics - all he needs is a 24" hydraulic hose and a $25 quick coupler. Takes less than 30 minutes to install. Why spend $500+ and days fabricating a PTO pump and reservoir? Dan

The exact relationship of loader and 3pt is not clear to me but replumbing will make it clear. It would be interesting to see the underside of that round flange on the end of the hydraulic supply tube. Dan

I see multiple problems with that plumbing - use of tank return for power beyond AND a dead headed DA work circuit. The deadheading is probably the most concerning. Dan

If there is no factory outlet block in the line just cut a section out of the tube and put a couple tube fittings on the ends. Quick, easy and inexpensive. I have done that on dozens of old Fords. Dan

Dont believe everything you are told. Your 3pt splitter will work and its dirt cheap to hook up. Here is my 3pt log splitter on a L3901. It has been upgraded with a regenerative splitter valve and cycle time is 15 seconds with extend speed almost twice retract. That will keep one man busy. Dan

It is a finishing mower and not ground engaging - absolutely no problem. Just dont hook it on something immovable... Dan

Clever 🫠 Dan

I have ZERO direct knowledge but looks to me like it just unbolts from the underside of the transmission. Dan

Kubota has been using variations on that for 50 odd years. Heres the three port version on my 2021 L3901 Dan

At top of lift the position control is what stops the lift from trying to go too far. Is posiyion conyrol moving when the lift is at mid point and bouncing? Dan

The few dollars needed to replace the loadet valve is not much more than you are going to spend on an inline relief. If you replace the loader valve the system will be fully protected AND allow you to use the 3pt and the loader concurrently. Dan

The tractor has factory provision for hydraulic outlet and was discussed 4 years ago.. It just needs a simple bolt on aluminum cover plate with two ports in the face. Probably easier to fabricate than chopping on the lines. Dan

You are welcome. Good luck sourcing your parts. Dan

Neither - use compression type hydraulic tube fittings. If you are going to cut the line you can feed your loader valve from the pump half and then return pressure (the high pressure carry over / power beyond port on the loader valve) to the other half of the line. That is equivalent to using...

Yes it matters. This is a 4 year old thread which started with your loader connection. I assumed you had taken the original advice and replumbed the loader off the front outlet block. Plumbed as you ßtill have it the loader valve will not protect the 3pt. Dan

I understand your reluctance to change the loader valve but you seem to have a misunderstanding of the hydraulics. A loader valve with inlet relief protects ALL of the systems and is equivalent to your proposed inline relief. Kubota used that scheme for years. Dan

A more traditional solution is to use a loader valve with a built in inlet pressure relief. The loader valve then acts as the main system relief. Dan

I have no idea what your motivation is but 2000-2400 PSI (135- 160 BAR) is the range you are after. You can use a general purpose 3 port inline relief valve - it does not need to be tractor specific. I would also suggest one that can be externally adjusted. Dan

I have not looked at the parts diagram but OTTOMH the only route to the crankcase is via the shaft seal. Dan