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Thanks you very much for your answer. We took many actions: We changed the oil tank with new oil level flotant, the flexible hose that connect the oil tank with the gearbox oil pump, the shutoff valve locate below of the oil tank and we repeated the prodedure of fill oil tank with new oil. Also, we changed the oil filter because the filter was very dirty. Then of this, the problem dissapeared. I hope that our experiencie will serve you. Regards.