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The blue marked hose goes to this connection

The red hose runs to quick coupler then back to this loader valve connection..

I'll send that picture shortly.

Sorry for the delayed response, had some plowing to do...I have this picture of valve I took in the beginning

The seemingly impossible, a good mystery:). What do we do next? Test outputs at cylinders etc?

This is the bold number on loader arm.

No , the bucket does nothing.

The 3 point operated very slowly, up and down. It does not now . The loader has not functioned. The bucket jerks up maybe an inch then does not move. Loader does not move otherwise.

The red hose disconnected, When the bucket is operated the flow stops.

Yes, of course, I am using a clean bucket. I return the fluid to tractor after each test. I'll perform the next test when sun comes up, lol.

I reseated quick coupler and no change on loader. I disconnected red hose stuck it in bucket, ran at full throttle for 20 seconds. Bucket has 3 gallons of fluid .

Got it! First thing in the morning.

So those two hoses are supposed to be connected? You want me to uncouple and recouple this connection? Then check operation and flow check, yes?

When you mentioned third function, I flashed on two hoses that run to the back of tractor. They are connected together. I upload pictures. One of the two connected hoses runs to the red marked connection on block. The other hose connects to loader valve at the port in foreground of photo.

There are 3 other hose connections on loader valve besides the quick connects.

No third function , the quick connects on loader valve have color coded rubber plugs on valve and connector. They matched so I "assumed" they are correct. Do I need to verify the hoses on loader valve are routed correctly?

I sent reply, I guess it didn't send. That is correct, those are the readings I got for pressure and flow There is no change in loader operation when hoses were switched.

That is what happened.

No change in loader operation

Okay, I will do as described. Thank you