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I agree with gpreuss that oil should flow through the remote hyd valve while traveling to the 3 pt valve IE attached in series not parallel

There's no hyd cylinder that operates the remotes. To find priority valve one would need to search parts catalog or service manual.

Hyd oil at operating temp. should be about 100 degrees above ambient temp.

You should be able to hear a relief valve by-passing. One can use a laser therm. to find hot spots. hot spots indicate internal hyd leak.

If not bubbles are visible in sight glass you have installed too much R134A. R12 & R134A are different when it comes o bubbles.

While cleaning rad. did you also clean the hyd oil cooler?? It sounds as if oil is getting too hot from a leaking relief valve or oil cooler problem.

Did you get air free fuel all the way to inj pump?

IMHO draining fuel is a waste of time & money unless it bio diesel made from Soybeans and has been setting several yrs. Contaminants such as dirt/water can be filtered from fuel.The worst thing that could be in fuel is algae and it can be killed. I'd recommend changing fuel filter,bleeding air...

Do these filters you refer to come in a Kubota logo box with full Kubota PN printed on the box?

I just replaced hyd filters on my M7040 and the original filters were grey and the new filters in a Kubota box with Kubota PN were white.

If your theory is correct about a relief valve stuck open oil light should have been flickering before oil/filter change.

You stated comparing the M6800 to JD 6420 so I was just clarifying that the weren't in the same CLASS.

I suggest before going to trouble to drop oil pan to install a manual oil gauge to determine if there really is an oil pressure/pump problem. It would be very disheartening to drop oil pan and find out it's an electrical problem.

Comparing the ride of a 65 pto hp tractor to a 90 pto hp tractor isn't exactly comparing apples to apples and oranges to oranges. Look at it this way when the electrical solenoids/switches on your JD fail the Kubota will still be able to move and hyd functions operate. I fail to see the...

If filters are original they will be painted grey. I hope no damage was done.

Since your tractor has hyd shuttle it has no true traction clutch to slip but rather has a damper clutch and the shuttle clutches serve as traction clutches. Therefore I would highly recommend changing hyd filters and possibly checking hyd pressure. Normally if a clutch is slipping it will pull...

Which type shuttle Sync or hyd?

Potteryone OR another option would be to trade your Kubota for a Belarus :) as they are one of the few newer model tractors with DP on 3pt.

I agree with kubotasam on installing flow restricters. I had to do the same thing on a M4900 I did own. Now I have a M7040 as it operates like a fine tuned machine.

I agree unless inj pump has been run out of fuel there should be no need to bleed fuel inj pump or injectors just from changing fuel filter. Just bleed air out of filter and crank engine.