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Dan, I have a B8200 4WD (with a shifter) with the same problem. I'll try to keep this brief. I had it apart in fall '06 when i got it to replace the engine. I cleaned the suction strainer and used Kubota UDT when re-assembled. It didn't get much cold weather use till 2010 and that's when the trouble started. At first I thought "Loader valve" but the studdering and then nothing really seemed like cavitation from a dirty suction strainer or a chunk of ice that took a few seconds before blocking flow. So I pulled the suction screen. It seemed pretty clogged but I did not find any ice. I cleaned it and put it back together. I don't recall how it performed the rest of that winter but it has been a problem the last few. This past fall I drained the fluid and it seemed somewhat creamy so I flushed the system, put in a new suction strainer, new fluid (not Kubota but it said compatible with Kubota UDT on the pail), and a new shifter boot because it is a route for water to get in. I thought "no problems this winter". I was about 15 degrees the other day and it's not any better! I unhooked the lines to the loader and changed the directional valve position and still no pressure. I put the valve back and looped the pressure line back to hydraulic block and still no pressure. I bet if you try this you'll have the same results. This rules out the loader valve and the Amish.
In the Kubota WSM they place the pressure gauge between the pump and the hydraulic block and then restrict the flow to build pressure. This isolates the pump, so if no pressure it can only be the pump or no fluid getting to the pump. I don't have the same pressure test setup as in the book so I'm Next I'm going to brave the cold and disconnect the return line at the top of the transmission and route it to a bucket to check if flow is present even though high pressure isn't. If no fluid comes out I'm going to pull the suction strainer again. I may also, depending on what I find, while the strainer is out and a bucket under the transmission, separate the suction line (it's two piece), attach a hose to the short side attached to the pump and put the hose in the bucket and try the hydraulics again. I'll let you know how it works out. By the way, the loader valve and the three point control valve do seem to be available from Kubota.

Rob

Kubota B8200 after Hose and Fluid change no Hydraulics
Kubota Tractors
Replies 46 Post by Rguarino