Was reading your post. Know this isn't going to help your sitation but we had a test procedure that worked well for isolating the pump from all the rest of the hydraulic valves etc. With all the signal check valves etc in this system some weird things take place and it was always good to know if the pump and supply was working properly before you started tracing down other areas. The max pressure is actually controlled in the pump compensator but you have an added safety relief valve in the draft control housing. Just a tiny bit of crud in that compensator can really mess things up. With that original style screen, thermal bypass valve system on the filter a lot of junk can go through. There is also a couple of small orfices and screen that can get plugged. I took a lot of them compensators apart and did some polishing but that was like 20 plus years ago. That is where the isolating it to the pump itself was really nice. Took some time to hook up for the test so I am sure some didn't care to do it. Of course these tools came from IH so independent shops didn't have them unless they picked them up at a dealer close out .
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