A milling machine includes a rotor drive transmission having a plurality of gears disposed between a prime mover and a cutting rotor. The rotor drive transmission is associated with a rotor transmission hydraulic circuit including a hydraulic gearshift actuator to engage the plurality of gears in one or more gear ratios and a gearshift directional control valve to direct hydraulic fluid to and from the hydraulic gearshift actuator. In occurrence of a fault condition, the rotor transmission hydraulic circuit includes a gearshift trapping valve to maintain hydraulic pressure in the hydraulic gear actuator and the engaged gear ratio of the rotor drive transmission.

A road milling machine includes a machine frame having a longitudinal axis. A plurality of ground engaging units support the machine frame from a ground surface. A milling drum is supported from the machine frame. An operator's station is supported from the machine frame by a support linkage configured to move the operator's station laterally between an inner position and an outer position relative to the machine frame. The support linkage includes at least one pivot link extending between the machine frame and the operator's stationand oriented to pivot about a pivot axis extending parallel to the longitudinal axis of the machine frame. The operator's station in the outer position extends laterally partially beyond the machine frame on one of the left and right edges of the machine frame, the outer position being at a higher elevation than the inner position relative to the machine frame.

A milling assembly for a cold planer including a frame and an actuator assembly having a plurality of movable locking rods for mounting the milling assembly to the frame is disclosed. The milling assembly comprises a drum housing, and a plurality of mounting units fixed to the drum housing for mounting the milling assembly to the frame. The mounting units include a plurality of mounting holes configured to receive a respective end portion of one of the plurality of movable locking rods. In another embodiment, a milling assembly including an actuator assembly with movable locking rods is disclosed.

A milling machine has a frame, ground engaging tracks that support the frame, a first actuator connecting the frame to a first track of the ground engaging tracks and a second actuator connecting the frame to a second track from the ground engaging tracks. The milling machine has an orientation sensor that determines an orientation of the frame. The milling machine has a controller that operates the first and second actuators to raise or lower the frame. The controller determines the frame orientation using the orientation sensor. The controller also determines a velocity error between actuator velocities of the first and second actuators based on the frame orientation and a target orientation of the frame. The controller determines a control parameter for the second actuator based on the velocity error and operates the second actuator using the determined control parameter.

In a self-propelled construction machine comprising a working device (e.g. milling drum) and a profile sensor device arranged in front of the milling drum as seen in the direction of travel, the following features are achieved: the profile sensor device measures ground pavement profile data in at least one first location, wherein at least one second sensor device is provided which, after the construction machine has traversed a section corresponding to the distance between the milling drum and the profile sensor device, measures or otherwise determines, in at least one point associated with the first location, at least one distance value between the ground surface and the milling drum, wherein a machine control system correlates the determined distance value for the at least one point with a corresponding at least one point associated with the measured ground profile data.

The invention relates to a method for operating a ground milling machine, in particular a road milling machine, a stabilizer, a recycler, a surface miner or the like, having an interchangeable milling drum, wherein the milling drum is equipped with a plurality of milling tools, in particular round shank picks, wherein the milling drum has a current state, wherein a control unit is provided for controlling at least one function of the ground milling machine, and wherein the milling drum has a characteristic feature or a characteristic feature is assigned to the milling drum. According to the invention, provision is made that at least one data set containing information on the current state of the milling drum is stored in a storage unit, in that the characteristic feature identifying the milling drum is assigned to the data set in the storage unit, and this data set is transmitted to a processing device.

A milling machine is provided comprising a frame including a plurality of height-adjustable legs; a rotor; a rotor chamber including a movable front wall, a movable rear wall, and a pair of movable side walls; and a controller. The controller is configured to enable a rotor chamber binding control during on a lowering of the rotor towards a ground surface; automatically raising at least one of the front wall or the rear wall during the lowering of the rotor; and disable the rotor chamber binding.

The present invention relates to a method for controlling a road milling machine comprising a milling drum and a rear blade when there is an obstacle located in the ground to be milled, comprising the following steps: a) Milling the ground at a predetermined milling depth (FT) along a working direction (a); b) Advancing the road milling machine in the working direction (a) towards the obstacle located in the ground; c) Raising the milling drum and the rear blade out of the ground in the working direction (a) in front of the obstacle; d) Moving over the obstacle in such a way that the milling drum remains out of contact with the obstacle; e) Lowering the milling drum and the rear blade to the predetermined milling depth (FT) in the working direction (a) behind the obstacle and continuing the milling of the ground, wherein the road milling machine is controlled in such a way that in step c) the raising of the milling drum is carried out before the raising of the rear blade out of the ground, wherein the road milling machine continues to move in the working direction (a) between the raising of the milling drum and the raising of the rear blade. The present invention also relates to a road milling machine for performing the method.

A self-propelled milling machine has a machine frame 4 supported by running gears 6A, 6B, a working device 5 provided on the machine frame 4 for working the ground, and a conveyor device 12 for removing material. The conveyor device 12 has a boom 13 which is mounted on the machine frame 4 so as to pivot about an axis of rotation X which is perpendicular to the machine frame. The pivoting apparatus 16 for the boom 13 is characterised by at least one mechanism 16A, 16B having a plurality of mechanism links and the joints A, B, C, D connecting them and at least one linear drive 17A, 17B for driving at least one of the mechanism links. The mechanism may be designed as a planar four-link pivot joint mechanism 16A, 16B, the machine frame 4 forming a mechanism link of the pivot joint mechanism.

A wear prognosis method and a maintenance method for an earth working machine are disclosed, along with an apparatus for performing the method. Provision is made that the current wear state of one or more earth working tools is sensed. The residual wear capacity until the wear limit is reached is then ascertained from the current wear state.