A levelling group of an aerial work platform includes: a support base for supporting a containing cage of an aerial work platform, a support frame hinged to the support base so as to be able to oscillate with respect to an oscillation axis, at least a pair of ground rest elements hinged independently to the support frame, with respect to respective articulation axes parallel to one another and substantially perpendicular to the oscillation axis, such as to be able to independently vary a height thereof with respect to the support base.

A track vehicle includes: a frame; a rotatable driving wheel carried by the frame; a track engaged with the driving wheel; an idler wheel engaged with the track; a tensioner coupled to the idler wheel to force the idler wheel into engagement with the track; a recoiler coupled to the tensioner; and a fluid damper attached to the frame and coupled to the tensioner and the recoiler. The fluid damper includes: a fluid chamber having two ports; a piston coupled to at least one of the tensioner and the recoiler within the fluid chamber; and a restriction circuit fluidly connected to the ports and configured to form a closed fluid circuit. The restriction circuit permits a substantially unrestricted fluid flow through the closed fluid circuit when the piston moves in one direction and a restricted fluid flow through the closed fluid circuit when the piston moves in the opposite direction.

A track vehicle includes: a frame; a rotatable driving wheel carried by the frame; a track engaged with the driving wheel; an idler wheel engaged with the track; a tensioner coupled to the idler wheel to force the idler wheel into engagement with the track; a recoiler coupled to the tensioner; and a fluid damper attached to the frame and coupled to the tensioner and the recoiler. The fluid damper includes: a fluid chamber having two ports; a piston coupled to at least one of the tensioner and the recoiler within the fluid chamber; and a restriction circuit fluidly connected to the ports and configured to form a closed fluid circuit. The restriction circuit permits a substantially unrestricted fluid flow through the closed fluid circuit when the piston moves in one direction and a restricted fluid flow through the closed fluid circuit when the piston moves in the opposite direction.

A snow thrower includes a frame, a prime mover supported by the frame, and a handle assembly coupled to the frame. The handle assembly includes a grip for an operator to grasp. The snow thrower further includes an auger housing supported by the frame, and an auger blade rotationally coupled to and disposed within the auger housing. A track drive system is coupled to the frame to facilitate movement along a ground surface. The track drive system includes a drive wheel rotatably driven by the prime mover, an idler wheel rotatably supported by the frame, and a flexible track interconnecting the drive wheel and the idler wheel. The idler wheel is translatable relative to the frame to adjust an orientation of the auger housing relative to the ground surface.

A snow thrower includes a frame, a prime mover supported by the frame, and a handle assembly coupled to the frame. The handle assembly includes a grip for an operator to grasp. The snow thrower further includes an auger housing supported by the frame, and an auger blade rotationally coupled to and disposed within the auger housing. A track drive system is coupled to the frame to facilitate movement along a ground surface. The track drive system includes a drive wheel rotatably driven by the prime mover, an idler wheel rotatably supported by the frame, and a flexible track interconnecting the drive wheel and the idler wheel. The idler wheel is translatable relative to the frame to adjust an orientation of the auger housing relative to the ground surface.

A rotary pivot arm positioning assembly for a paving, texturing, or curing machine allows the machine to automatically transition from an operational orientation to a transport orientation without manual repositioning or disconnection of its components. The assembly includes a pivot arm coupled to both the front and aft ends of an end frame by a helical actuator, slew gear drive or other rotary actuator. The rotary actuator articulates each pivot arm, as well as the adjustable leg and steerable crawler connected to the pivot arm, through at least a 90-degree range. The end frame may be fixed to the left or right end of the machine. The assembly may additionally include a second helical actuator, slew gear drive or rotary actuator connecting each steerable crawler to the adjustable leg and configured to rotate the steerable crawler through a full 360 degrees.

A rotary pivot arm positioning assembly for a paving, texturing, or curing machine allows the machine to automatically transition from an operational orientation to a transport orientation without manual repositioning or disconnection of its components. The assembly includes a pivot arm coupled to both the front and aft ends of an end frame by a helical actuator, slew gear drive or other rotary actuator. The rotary actuator articulates each pivot arm, as well as the adjustable leg and steerable crawler connected to the pivot arm, through at least a 90-degree range. The end frame may be fixed to the left or right end of the machine. The assembly may additionally include a second helical actuator, slew gear drive or rotary actuator connecting each steerable crawler to the adjustable leg and configured to rotate the steerable crawler through a full 360 degrees.

In a power supply system comprising an electric generator, a DC intermediate circuit, at least one rechargeable electrical energy storage, which is connected to the DC intermediate circuit, a rectifier via which the electrical generator is connectable to the DC intermediate circuit, and at least a first inverter, the DC side of which is supplied with direct current from the DC intermediate circuit and the AC side of which is connectable to an electrical load, and further comprising a control device which regulates the generator in dependence on the load of the electrical load, it is provided that the control device is designed to switch between a first and a second operating mode of the power supply system, wherein in the first operating mode the electrical energy generated by the electrical generator is supplied via the rectifier to the DC intermediate circuit, and in the second operating mode the generator is connected to the load in parallel with the inverter.

In a power supply system comprising an electric generator, a DC intermediate circuit, at least one rechargeable electrical energy storage, which is connected to the DC intermediate circuit, a rectifier via which the electrical generator is connectable to the DC intermediate circuit, and at least a first inverter, the DC side of which is supplied with direct current from the DC intermediate circuit and the AC side of which is connectable to an electrical load, and further comprising a control device which regulates the generator in dependence on the load of the electrical load, it is provided that the control device is designed to switch between a first and a second operating mode of the power supply system, wherein in the first operating mode the electrical energy generated by the electrical generator is supplied via the rectifier to the DC intermediate circuit, and in the second operating mode the generator is connected to the load in parallel with the inverter.

A system and method for compensating reduced track speed because of engine droop for a work machine is disclosed. The system may comprise a frame, an attachment coupled to the frame, a ground-engaging mechanism adapted to support the frame, an engine, a motor, a track speed sensor, an engine speed sensor, and a controller. The engine may drive the ground-engaging mechanism and attachment. The engine may be coupled through a variable speed transmission to the ground-engaging mechanism and the attachment. They variable speed transmission may include a hydrostatic circuit. The controller may be adapted to send an increased transmission command signal based on a drop in the engine speed signal when the work machine engages an increased load. The increased transmission command signal may increase a motor speed to cause an increase in track speed to compensate at least a portion of the reduced track speed from the engine speed droop.