Abstract: In the event of a malfunction in the supply of hydraulic fluid to the a braking device actuating device a hydraulic system has a manually actuated emergency-operation valve arrangement which is formed in such a way that, after the manual actuation thereof, a fluid connection is created between a steering device actuating device and the a pressure chamber of the braking device actuating device. The emergency-operation valve arrangement has a valve block in which flow paths are formed which can be shut off by means of shut-off screws.

Abstract: In a self-propelled construction machine (1), in particular road milling machine, comprising a machine frame (8), at least three travelling devices (12, 16), wherein at least one of the three travelling devices (12, 16) is realized as a pivotable travelling device (16) so that said travelling device (16) is pivotable about at least one vertical pivoting axis in relation to the machine frame (8) between a first pivoted-in and at least one second pivoted-out position, at least one working device (20), in particular a milling drum, for working the ground pavement (3), at least one hydraulic drive system (70) for driving at least two travelling devices (12, 16), wherein at least one of the at least two driven travelling devices is the pivotable travelling device (16), wherein the hydraulic drive system (70) comprises at least one hydraulic pump (78), it is provided for the following features to be achieved: the hydraulic drive system (70) comprises one each hydraulic variable displacement motor (72) for driving t

Abstract: The self-propelled construction machine according to the invention, in particular a road milling machine, stabiliser, recycler or surface miner, has a machine frame 1, a work roller arranged on the machine frame, and a left-hand edge protector 5A arranged on the left-hand side of the work roller in the working direction and a right-hand edge protector 5B arranged on the right-hand side of the work roller in the working direction. In order to raise and/or lower the left-hand and/or right-hand edge protector 5A, 5B, a hydraulic system is provided which comprises a hydraulic source 20 for providing hydraulic fluid.

Abstract: In a self-propelled construction machine (1), in particular road milling machine, comprising a machine frame (8), at least three travelling devices (12, 16), wherein at least one of the three travelling devices (12, 16) is realized as a pivotable travelling device (16) so that said travelling device (16) is pivotable about at least one vertical pivoting axis in relation to the machine frame (8) between a first pivoted-in and at least one second pivoted-out position, at least one working device (20), in particular a milling drum, for working the ground pavement (3), at least one hydraulic drive system (70) for driving at least two travelling devices (12, 16), wherein at least one of the at least two driven travelling devices is the pivotable travelling device (16), wherein the hydraulic drive system (70) comprises at least one hydraulic pump (78), it is provided for the following features to be achieved: the hydraulic drive system (70) comprises one each hydraulic variable displacement motor (72) for driving t

Abstract: The self-propelled construction machine according to the invention has a braking device which comprises at least one hydraulically actuated braking device actuating device 8 which has a pressure chamber 10A, 11A that can be acted upon with a hydraulic fluid. The braking device actuating device 8 is formed in such a way that, in a locking position, the running gear 3B, to which the braking device actuating device 8 is assigned, is braked, and, in an operating position, the running gear is unbraked. In addition, the construction machine according to the invention has a hydrostatic steering device 9, which comprises at least one hydraulic steering device actuating device 22.

Abstract: The self-propelled construction machine according to the invention, in particular a road milling machine, stabiliser, recycler or surface miner, has a machine frame 1, a work roller arranged on the machine frame, and a left-hand edge protector 5A arranged on the left-hand side of the work roller in the working direction and a right-hand edge protector 5B arranged on the right-hand side of the work roller in the working direction. In order to raise and/or lower the left-hand and/or right-hand edge protector 5A, 5B, a hydraulic system is provided which comprises a hydraulic source 20 for providing hydraulic fluid.

Abstract: A road construction machine includes a machine frame and two front and two rear crawler track units. Each crawler track unit includes a piston-cylinder unit. A central pressure limiting valve communicates a hydraulic pressure source with a hydraulic supply line. The hydraulic supply line communicates the central pressure limiting valve with the piston-cylinder units of all four crawler tracks. A common pressure accumulator is communicated with all four of the piston-cylinder units.

Abstract: In a road construction machine, in particular a road milling machine (1), with a machine frame (2), and a chassis (4) with preferably several crawler track units (6), said chassis (4) carrying the machine frame (2), where the crawler track units (6) comprise a chain (12) which continuously revolves around at least one guide wheel (8) and at least one drive wheel (10), as well as several track rollers (14) which roll on the chain (12) and carry the machine frame (2), where the drive wheel (10) or preferably the guide wheel (8) is provided with an adjustment device (18), which enables the reciprocal spacing of the axles (20,22) of the drive wheel and guide wheel (8,10) to be adjusted for adaptation to a current lengthening of the chain (12), and where in addition to the adjustment device (18), a spring element (24) is provided which allows, using the adjusted spacing as a basis, a shortening of the spacing between the axles (20,22) of the drive wheel and guide wheel (8,10) against the spring force in the event

Abstract: In a road construction machine, in particular a road milling machine (1), with a machine frame (2), and a chassis (4) with preferably several crawler track units (6), said chassis (4) carrying the machine frame (2), where the crawler track units (6) comprise a chain (12) which continuously revolves around at least one guide wheel (8) and at least one drive wheel (10), as well as several track rollers (14) which roll on the chain (12) and carry the machine frame (2), where the drive wheel (10) or preferably the guide wheel (8) is provided with an adjustment device (18), which enables the reciprocal spacing of the axles (20,22) of the drive wheel and guide wheel (8,10) to be adjusted for adaptation to a current lengthening of the chain (12), and where in addition to the adjustment device (18), a spring element (24) is provided which allows, using the adjusted spacing as a basis, a shortening of the spacing between the axles (20,22) of the drive wheel and guide wheel (8,10) against the spring force in the event

Abstract: In a road construction machine, in particular a road milling machine (1), with a machine frame (2), and a chassis (4) with preferably several crawler track units (6), said chassis (4) carrying the machine frame (2), where the crawler track units (6) comprise a chain (12) which continuously revolves around at least one guide wheel (8) and at least one drive wheel (10), as well as several track rollers (14) which roll on the chain (12) and carry the machine frame (2), where the drive wheel (10) or preferably the guide wheel (8) is provided with an adjustment device (18), which enables the reciprocal spacing of the axles (20,22) of the drive wheel and guide wheel (8,10) to be adjusted for adaptation to a current lengthening of the chain (12), and where in addition to the adjustment device (18), a spring element (24) is provided which allows, using the adjusted spacing as a basis, a shortening of the spacing between the axles (20,22) of the drive wheel and guide wheel (8,10) against the spring force in the event