Hydraulic solutions on a to a tractor or equivalent connected work machine, where the work machine shows several hydraulic driven work units and hydraulic motors, and where the hydraulic motors are so mounted and connected that the pressure drop over the hydraulic motor of the most congested work unit also in static conditions can increase markedly over the system pressure of the hydraulic power source that drives the work machine and where the rotors of the hydraulic driven working units can be reversed to free a possible blockage.
