The invention relates to a head for distributing the oil to the servomotor for operating the blades of the Kaplan-type turbine rotor or of the bulb-type turbine. According to the invention, the distribution head has a body (1), some fixed columns (2a and 2b) and a collector (3) wherein there are mounted two spherical bushes (4 and 5) which provide the guiding and the sealing of some mobile columns (6 and 7), namely an inner column and an outer one, wherethrough the pressurized oil is conveyed towards the servomotor of the turbine rotor, the fixed columns (2a and 2b) being reinforced and sealed between them and towards the exterior with a ring (8) and some lids (9 and 10), and the assembly comprising the spherical bush (4), exterior semi-rings (11a and 11b), the other spherical bush (5) - interior semi-rings (16a and 16b), respectively, allow the mobile column (6), exterior and interior (7), to make translation and rotation movements, due to the possibility of self-centering.
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