English to Spanish Tech/Engineering Mechanics / Mech Engineering excavator

Hi everyone,

I hope you can help me with the translation of "servo oil unit".

The hydraulic part of the system consists of the servo oil circuit (i.e. of the pump P9, servo oil unit
SU1) which supplies the servo pressure to the regulating solenoid valves Yr... via the switching so-
lenoid valves Y...

***

The pump P9 feeds the servo oil unit SU1.
The pressure relief valve in SU1 limits the servo pressure to 55 bar. The hydraulic oil flow through the
filter mounted in by-pass with a check valve and feeds in parallel the different outputs for SU1 and
the RSV Y3.1, Y3.2, Y3.3, Y4, Y7, Y94 and Y136

Thanks!