English to Italian Tech/Engineering Mechanics / Mech Engineering macchine perforatrici

si parla della manutenzione di una perforatrice idraulica. LA frase esatta è:" Normal operation requires daily greasing of the front rotation housing every 2 percussion hours"..... "With the shank removed, remove the 4 bolts retaining the front plate to the rotation housing." .... " Pull the chuck driver and pinion gear from rotation housing." .... "Slide the thrust collar and seal carrier from the rotation housing".
Si traduce semplicemente con "scatola degli ingranaggi di rotazione"?
grazie mille