A soil processing machine includes a hydraulic drive system including an electrohydraulic pressurized fluid source with at least one electric motor and at least one hydraulic drive pump, a hydraulic drive circuit fed with pressurized fluid by the at least one hydraulic drive pump, at least one hydraulic drive motor fed with pressurized fluid from the hydraulic drive circuit, and a discharge valve assembly for discharging fluid from the hydraulic drive circuit to a fluid reservoir. The hydraulic drive system is designed to operate the discharge valve assembly as a function of at least one of the following parameters: a temperature of the fluid in the hydraulic drive circuit, an ambient temperature, a viscosity of the fluid in the hydraulic drive circuit, a degree of contamination of the fluid in the hydraulic drive circuit, a period of time since the last start-up of the hydraulic drive system, a period of time since the last fluid was discharged from the hydraulic drive circuit.

A hydraulic flushing system comprises a hydraulic machine including a case drain, a gearbox having a cavity, and a flushing valve. The case drain is included in a hydraulic pump or a hydraulic motor. The flushing valve is fluidly connected to the case drain, fluidly connected to the cavity, and fluidly positioned between the case drain and the cavity. The flushing valve is configured to selectively allow hydraulic fluid to flow from the case drain to the cavity.

A hydraulic flushing system comprises a hydraulic machine including a case drain, a gearbox having a cavity, and a flushing valve. The case drain is included in a hydraulic pump or a hydraulic motor. The flushing valve is fluidly connected to the case drain, fluidly connected to the cavity, and fluidly positioned between the case drain and the cavity. The flushing valve is configured to selectively allow hydraulic fluid to flow from the case drain to the cavity.

The invention relates to a hydraulic circuit provided with at least one hydraulic power machine (2, 4) connected to a low-pressure circuit (6) and to a high-pressure circuit (10) transmitting said power, wherein the machine is provided with a drain which allows internal leaks in the casing thereof to flow towards a low-pressure accumulator (8) or a vessel at atmospheric pressure, said circuit comprising an intake pipe (30) connecting the low-pressure circuit (6) to the casing of the machine, and an outlet pipe (36) forming the drain receiving the flow from the intake pipe in order to guide same towards the vessel (8), including a heat exchanger (42) and a filter (44) forming the fluid treatment elements for the entire hydraulic circuit, said circuit also comprising a means for monitoring the flow (40) in the intake and outlet pipes.

The invention relates to a hydraulic circuit provided with at least one hydraulic power machine (2, 4) connected to a low-pressure circuit (6) and to a high-pressure circuit (10) transmitting said power, wherein the machine is provided with a drain which allows internal leaks in the casing thereof to flow towards a low-pressure accumulator (8) or a vessel at atmospheric pressure, said circuit comprising an intake pipe (30) connecting the low-pressure circuit (6) to the casing of the machine, and an outlet pipe (36) forming the drain receiving the flow from the intake pipe in order to guide same towards the vessel (8), including a heat exchanger (42) and a filter (44) forming the fluid treatment elements for the entire hydraulic circuit, said circuit also comprising a means for monitoring the flow (40) in the intake and outlet pipes.

Hydraulic fluid flushing valve for hydrostatic units usable in closed hydraulic circuit propel applications, having a flushing valve housing with a first inlet port connected to a first working line, a second inlet port connected to a second working line, and a discharge port for draining hydraulic fluid. A two-sided flushing valve flushing valve spool which can be shifted is mounted within the flushing valve housing in a cylindrical valve bore, which, in a shifted position, enables a fluid flow from one of the first or the second inlet port at which the lower hydraulic pressure is present, to the discharge port. The flushing valve spool includes on each side a pressure surface each of which is connected to one of the two inlet ports. At each side of the flushing valve spool a flushing valve spring is located in the flushing valve housing in such a manner that, when the flushing valve spool is in its centre, non-shifted position, at each side of the flushing valve spool a distance between a spring contact surface on the flushing valve spool and a spring support surface in the flushing valve housing is greater than the axial length of the corresponding flushing valve spring.

The present invention relates to a closed hydraulic circuit between a hydraulic pump and a hydraulic motor that are connected to one another via working lines, a flushing pump being provided in order to feed a pressure medium into the working lines, and an output connection being provided in order to discharge excess pressure medium from the working lines. At least one hydraulic consumer, which is provided to convert at least some of the volume flow discharged from the hydraulic circuit into mechanical power, is connected downstream of the output connection.

The present invention relates to a closed hydraulic circuit between a hydraulic pump and a hydraulic motor that are connected to one another via working lines, a flushing pump being provided in order to feed a pressure medium into the working lines, and an output connection being provided in order to discharge excess pressure medium from the working lines. At least one hydraulic consumer, which is provided to convert at least some of the volume flow discharged from the hydraulic circuit into mechanical power, is connected downstream of the output connection.

A system for controlling an operation of a hydrostatic circuit of a work machine includes a flush control valve. The flush control valve is configured to be fluidly coupled to the hydrostatic circuit. The hydrostatic circuit is configured to operate in at least two operating modes to supply fluid power to selectively run a plurality of sub-systems of the work machine. In at least one operating mode of the at least two operating modes of the hydrostatic circuit, the flush control valve is configured to move and regulate a flushing flow rate of the fluid to equalize the flushing flow rate with a desired flushing flow rate based on a signal indicative of the at least one operating mode.

A system for controlling an operation of a hydrostatic circuit of a work machine includes a flush control valve. The flush control valve is configured to be fluidly coupled to the hydrostatic circuit. The hydrostatic circuit is configured to operate in at least two operating modes to supply fluid power to selectively run a plurality of sub-systems of the work machine. In at least one operating mode of the at least two operating modes of the hydrostatic circuit, the flush control valve is configured to move and regulate a flushing flow rate of the fluid to equalize the flushing flow rate with a desired flushing flow rate based on a signal indicative of the at least one operating mode.