Systems, methods and apparatus are provided for leveling and/or supporting a plant chassis. In some embodiments, a first set of actuators carry out a leveling routine and a controller monitors a pressure in a second set of actuators as the second set of actuators is extended.

A height-adjustable track drive system for an agricultural vehicle includes a support frame having four fixed-length links, each link rotatably coupled to two adjacent links at pivot points. Four wheels are connected to the support frame, and each wheel is connected to the support frame at one of the pivot points. A hydraulic cylinder connects nonadjacent pivot points of the support frame. An endless track rollably contacts each of the four wheels, and one of the wheels includes a drive wheel configured to be connected to a chassis of the agricultural vehicle. Related agricultural vehicles and methods are also disclosed.

A dive-resistant suspension for a snow machine having a ski assembly and a body has a swing arm and a resilient member that biases the swing arm downward relative to the body. The swing arm has a first rigid linkage and a second rigid linkage. The first rigid linkage has a first pivot point connected to the body of the snow machine and a second pivot point connected to the ski column. The second rigid linkage has a first pivot point connected to the body of the snow machine and a second pivot point connected to the ski column. The swing arm defines a travel path of the ski assembly as the swing arm moves between an operative position and a retracted position. In a first portion of the travel path, the ski assembly moves from the operative position forward and up relative to the body of the snow machine.

A dive-resistant suspension for a snow machine having a ski assembly and a body has a swing arm and a resilient member that biases the swing arm downward relative to the body. The swing arm has a first rigid linkage and a second rigid linkage. The first rigid linkage has a first pivot point connected to the body of the snow machine and a second pivot point connected to the ski column. The second rigid linkage has a first pivot point connected to the body of the snow machine and a second pivot point connected to the ski column. The swing arm defines a travel path of the ski assembly as the swing arm moves between an operative position and a retracted position. In a first portion of the travel path, the ski assembly moves from the operative position forward and up relative to the body of the snow machine.

The present invention relates to a suspension system (S; S1; S2) fora tracked vehicle (V; V1; V2). Said tracked vehicle comprises a vehicle body (4), a pair of opposite track assemblies (T1, T2), the respective track assembly comprising a plurality of road wheels (2) and an endless track (3) disposed around said wheels. Said suspension system comprises a road wheel arm (20) having a wheel axle portion (22) configured to support a road wheel of the vehicle and a pivot axle portion (24), the road wheel arm (20) being pivotably journalled at said pivot axle portion (24) to a support portion (30) configured to be fixed to the vehicle body (4). The suspension system comprises a torsion bar (40) having a first end portion (42) and an opposite second end portion (44), the first end portion (42) being connected to the support portion (30). The suspension system comprises an adjustment device (100) connected to the second end portion (44) of the torsion bar (40), the adjustment device being configured to adjust the torque on the torsion bar so as to adjust the height of the vehicle body relative to said pair of track assemblies. The invention also relates to a tracked vehicle with such a suspension system and a method for controlling such a suspension system.

The present invention relates to a suspension system (S; S1; S2) fora tracked vehicle (V; V1; V2). Said tracked vehicle comprises a vehicle body (4), a pair of opposite track assemblies (T1, T2), the respective track assembly comprising a plurality of road wheels (2) and an endless track (3) disposed around said wheels. Said suspension system comprises a road wheel arm (20) having a wheel axle portion (22) configured to support a road wheel of the vehicle and a pivot axle portion (24), the road wheel arm (20) being pivotably journalled at said pivot axle portion (24) to a support portion (30) configured to be fixed to the vehicle body (4). The suspension system comprises a torsion bar (40) having a first end portion (42) and an opposite second end portion (44), the first end portion (42) being connected to the support portion (30). The suspension system comprises an adjustment device (100) connected to the second end portion (44) of the torsion bar (40), the adjustment device being configured to adjust the torque on the torsion bar so as to adjust the height of the vehicle body relative to said pair of track assemblies. The invention also relates to a tracked vehicle with such a suspension system and a method for controlling such a suspension system.

A crawler traveling device includes a first wheel; a second wheel spaced from the first wheel; a support frame that supports the first wheel and the second wheel; a third wheel disposed above the support frame; an endless crawler wound around the first wheel, the second wheel, and the third wheel; and a vehicle-height changing mechanism that changes a position of the support frame in the vertical direction with respect to the third wheel. The vehicle-height changing mechanism has an actuator that is capable of contracting in the vertical direction and that changes the position of the support frame in the vertical direction with respect to the third wheel.

A method for setting the lifting position of a machine frame of a ground milling machine, which machine frame is connected via lifting means to movement means, and to a ground milling machine.

A machine for road work can comprise a frame, a plurality of ground engaging units, a plurality of vertically moveable legs, each leg connecting one of the plurality of ground engaging units to the frame, a pair of spatial sensors, such as global navigation satellite system (GNSS) sensors, and a controller configured to, in response to a three-dimensional signal received from each of the spatial sensors, activate at least some of the plurality of vertically moveable legs.

In one aspect of the present invention is provided an attachment device (100) for attachment of a trailing arm (54a) to a track support beam (22) intended to be connected, via said trailing arm (54a), to a center beam (30, 32) or other structural element situated between two track assemblies (21) of a tracked vehicle (10). The attachment device (100) is secured to the track support beam (22) and configured to attach the trailing arm (54a) to the track support beam (22) via an axis (X2) running above and substantially centrally along an upper side of the track support beam (22), in the longitudinal direction of the track support beam. In this way, a robust, structurally strong, suspension-admitting attachment device that is easy to manufacture and assemble is achieved. In another aspect of the invention is provided a tracked vehicle (10) comprising such an attachment device (100) and in a further aspect of the invention a method of manufacturing a track support beam (22) comprising such an attachment device (100).