hello mr Wizard i did not thought that also tailstock is hydra : i guess the break is hdyra, like advancing until desired force is reached, than hydra break
dealer respond today, saying that he will send me some color liquid, thus to put it inside the tank to mix with the oil, so to observe better the leaks
also we had to power off the machines, because somebody was suposed to do some interventions at the big electric panel, and with this ocasion, an operator showed me an oil leak under the turret ... normally that place should be dry
i will see kindly !