It internal at the rear of the rockshaft cylinder.Which rockshaft valve? I replaced the seals on the two valves on the back side of the rockshaft cylinder which stopped the leak/ fluid moving I saw inside the rockshaft cover.
Have you tried the 3 pt WITHOUT the loader connected, as TxJim asked?Sorry I forgot to state that you needed to put a plug in orifice on hyd filter cover after removing hose!!
If no oil comes out of open return hose when hose is disconnected & engine is operating then relief valve is not an issue or problem.
Does 3 pt operate correctly with FEL valve disconnected from tractor???
You should do this test again with the filter cover port plugged. We really need to know if there is flow from the loader valve return hose with the loader valve NOT being operated.Ok, I tried disconnecting the return line from the filter housing and running into the filler cap, didn’t really see anything coming out except all the hydraulic fluid out of the port on the filter housing....
I wholeheartedly agree to perform the test again with ported filter cover opening pluggedYou should do this test again with the filter cover port plugged. We really need to know if there is flow from the loader valve return hose with the loader valve NOT being operated.
How many gallons per minute do I need to get on the valve?From viewing your last photo I see no orifice for a closed center conversion plug. Your only good option is to exchange present 2 spool control valve for a dedicated closed center valve or a 2 spool valve that will accept & have a closed center conversion plug(see photo below) with correct CC conversion plug seals similar to valve below. After installing a 2 spool control valve for closed center hyd system your tractors 3pt/rockshaft & FEL should operate as designed.
Either you have an open center valve, or badly leaking (internally) closed center valve. Time to replace it it.Ok, I got some adapters to hook up the FEL supply line into the main steel line. The return line into the fill hole, definitely lots of fluid flowing out of it while everything is in neutral position. SO.....
What’s weird is the loader worked pretty well for a few weeks also, I moved a lot of dirt and it seem to be fine, until it all quit all together....Either you have an open center valve, or badly leaking (internally) closed center valve. Time to replace it it.
My GUESS why it even worked, is having the return going through the single spool valve and then through the rear SCV was enough restrictions for your 3pt to work?
I think you will find the sandwiched valves are in parallel (via internal passages) and not in series as it appears.My reasoning is if 2 spool valve was configured as it appears in OP's photo for open center operation then single spool valve configured for closed center would be the same as closed center valves sandwiched together similar to photo below.
You bring up a very good question & the more I think about it the more confusing it gets. I see what your stating about single spool CC valve when spool is in neutral position blocking dual spool valve return oil!!!!!
I'll bet single spool valve is open center also.