I was using my E26 Bobcat and suddenly it wouldn’t lift the boom. Everything else worked. When i tried to lift the boom, it would take up the slack in the joints, but stop there. This was after a couple hours of work. I felt the cylinder on the boom and it was kind of hot, but so were the other cylinders on the stick and bucket. None of them were so hot you couldn’t keep your hand on them. I stopped to eat lunch and when I came back, it worked fine. I’ve since used it another day and no problem. Would that just be dirt stuck in the boom valve or something?
Good day From your post it would be probable that you have some thing blocking the port relief on an intermittant basis. Kind regards Uffex