A large entertainment stage is rotated by a Geroler type hydraulic motor shown on the circuit. The regenerative center position on the directional valve eliminated a sudden jerk when first started since both ports were already pressurized. The pilot operated directional valve also had a smaller pilot pressure orifice installed to slow down the shifting speed softening the acceleration phase of the start cycle.
The problem they were complaining about was the big puddle of oil leaking out from under the stage every couple of months that required replacing the hydraulic motors that were leaking out through the shaft seal. They changed to a different Geroler brand motor and still suffered the same failure.