A switching device for alternately connecting a hydraulic drive of a lubricating pump to a pressure line and to a return line of a hydraulic circuit. The switching device includes first and second drive lines connected to the hydraulic drive, and pressure and return drive lines connected to the pressure and return lines. A switching valve is in fluid communication with the drive lines and is switchable between first and second switching states to connect the pressure drive line to the first drive line or to the second drive line. A plurality of hydraulic control lines control the position of the switching valve. The drive lines are configured to conduct a first volumetric flow of hydraulic fluid and the hydraulic control lines are configured to conduct a second volumetric flow of the hydraulic fluid different than the first volumetric flow.

A lubrication system for a hydraulic hammer includes a body defining a recess in fluid communication with a lubricant inlet and a lubricant outlet. A sleeve, located co-axially within the recess, defines a stepped tubular cavity having first and second portions. The sleeve also defines inlet and outlet ports extending from an outer surface to an inner surface of the sleeve. A piston, located partly within the recess and the first portion of the stepped tubular cavity respectively, has a tubular cavity co-axial with the stepped tubular cavity. A spool is located partly within the tubular cavity and the second portion of the stepped tubular cavity respectively. The spool co-operates with the inlet and outlet ports of the sleeve for reciprocally moving the piston in relation to the body so that lubricant from the lubricant inlet is delivered by the piston to the lubricant outlet via the recess.

A lubrication system for a hydraulic hammer includes a body defining a recess in fluid communication with a lubricant inlet and a lubricant outlet. A sleeve, located co-axially within the recess, defines a stepped tubular cavity having first and second portions. The sleeve also defines inlet and outlet ports extending from an outer surface to an inner surface of the sleeve. A piston, located partly within the recess and the first portion of the stepped tubular cavity respectively, has a tubular cavity co-axial with the stepped tubular cavity. A spool is located partly within the tubular cavity and the second portion of the stepped tubular cavity respectively. The spool co-operates with the inlet and outlet ports of the sleeve for reciprocally moving the piston in relation to the body so that lubricant from the lubricant inlet is delivered by the piston to the lubricant outlet via the recess.

A switching device for alternately connecting a hydraulic drive of a lubricating pump to a pressure line and to a return line of a hydraulic circuit. The switching device includes first and second drive lines connected to the hydraulic drive, and pressure and return drive lines connected to the pressure and return lines. A switching valve is in fluid communication with the drive lines and is switchable between first and second switching states to connect the pressure drive line to the first drive line or to the second drive line. A plurality of hydraulic control lines control the position of the switching valve. The drive lines are configured to conduct a first volumetric flow of hydraulic fluid and the hydraulic control lines are configured to conduct a second volumetric flow of the hydraulic fluid different than the first volumetric flow.

A lubrication system for a hydraulic hammer includes a body defining a recess in fluid communication with a lubricant inlet and a lubricant outlet. A sleeve, located co-axially within the recess, defines a stepped tubular cavity having first and second portions. The sleeve also defines inlet and outlet ports extending from an outer surface to an inner surface of the sleeve. A piston, located partly within the recess and the first portion of the stepped tubular cavity respectively, has a tubular cavity co-axial with the stepped tubular cavity. A spool is located partly within the tubular cavity and the second portion of the stepped tubular cavity respectively. The spool co-operates with the inlet and outlet ports of the sleeve for reciprocally moving the piston in relation to the body so that lubricant from the lubricant inlet is delivered by the piston to the lubricant outlet via the recess.

A lubrication system for a hydraulic hammer includes a body defining a recess in fluid communication with a lubricant inlet and a lubricant outlet. A sleeve, located co-axially within the recess, defines a stepped tubular cavity having first and second portions. The sleeve also defines inlet and outlet ports extending from an outer surface to an inner surface of the sleeve. A piston, located partly within the recess and the first portion of the stepped tubular cavity respectively, has a tubular cavity co-axial with the stepped tubular cavity. A spool is located partly within the tubular cavity and the second portion of the stepped tubular cavity respectively. The spool co-operates with the inlet and outlet ports of the sleeve for reciprocally moving the piston in relation to the body so that lubricant from the lubricant inlet is delivered by the piston to the lubricant outlet via the recess.