A hydraulically actuated liftable and lowerable hook of a crane has a hydraulic system comprises at least one working machine with a hydraulic motor driving a winch. At least one drive machine comprising a pump is connected directly or indirectly to at least one of the working machines by means of two connections via corresponding working lines, which serve as a feed or return depending on the operating state of the working machine. A lowering brake valve is provided in one working line and is connected to the other working line via a control line such that the lowering brake valve is displaceable against a restoring force by pressure, which prevails in the other working line and is forwarded via the control line, from the blocking position of said valve into a through-flow position for lowering the hook by means of a primary winch.

Provided is a tow attachment that can be installed on a work machine as an attachment for towing a tow object. This tow attachment installable as a work machine attachment for towing a tow object is provided with: a body frame; a winch fixed on the body frame; a coupling part which is provided to the body frame so as to be mounted on the work machine; a movable pulley part which is equipped with a hook for coupling to the tow object and at least one movable pulley; and a wire fixing part which is provided to the body frame in order to fix a leading end of a wire that is let out of the winch, wherein the wire is applied on the movable pulley of the movable pulley part between the winch and the wire fixing part.

Provided is a tow attachment that can be installed on a work machine as an attachment for towing a tow object. This tow attachment installable as a work machine attachment for towing a tow object is provided with: a body frame; a winch fixed on the body frame; a coupling part which is provided to the body frame so as to be mounted on the work machine; a movable pulley part which is equipped with a hook for coupling to the tow object and at least one movable pulley; and a wire fixing part which is provided to the body frame in order to fix a leading end of a wire that is let out of the winch, wherein the wire is applied on the movable pulley of the movable pulley part between the winch and the wire fixing part.

A cable guide device, including a cable with one end attached to an unwinding/rewinding device, another end having structure for accepting applied force, with cable therebetween guided by a cable guide, wherein as force is applied to the cable, the cable guide causes redirection of the applied force eliminating cable binding as cable is rewound. One embodiment is a trunnion-sheave winch-apparatus for object recovery, including: a trunnion-sheave of a pair of sheaves with cable inserted therebetween, one cable end attached to a winch drum with a hook attached to its other end for connection to an object being recovered, wherein as the object is recovered the force applied to the cable is redirected by the trunnion-sheave causing said cable to be maintained at a minimum of 90 contact with the pair of sheaves regardless of the angle of force being applied to the cable causing elimination of cable binding.

A track-type machine is disclosed. The track-type machine may comprise an electric drive powertrain including an internal combustion engine, a winch assembly having a drum rotatably supporting a cable so that the cable is reeled in or reeled out at a winch line speed when the drum is rotating, and an implement controller configured to activate the winch assembly for reeling in and reeling out the cable. The track-type machine may further comprise a hydraulic circuit driven by the internal combustion engine and configured to actuate a rotation of the drum when the winch assembly is activated by the implement controller. In addition, the track-type machine may further comprise a control system configured to increase an engine speed of the internal combustion engine when the winch assembly is activated by the implement controller.

A track-type machine is disclosed. The track-type machine may comprise an electric drive powertrain including an internal combustion engine, a winch assembly having a drum rotatably supporting a cable so that the cable is reeled in or reeled out at a winch line speed when the drum is rotating, and an implement controller configured to activate the winch assembly for reeling in and reeling out the cable. The track-type machine may further comprise a hydraulic circuit driven by the internal combustion engine and configured to actuate a rotation of the drum when the winch assembly is activated by the implement controller. In addition, the track-type machine may further comprise a control system configured to increase an engine speed of the internal combustion engine when the winch assembly is activated by the implement controller.

An electric powered pneumatic balancer is provided. In an embodiment it includes: a housing; an air balancer located in the housing; and a compressor located in the housing. The housing includes an opening to receive air to the compressor as it generates compressed air. The compressor is in fluid communication with the balancer which operates in response to receipt of the pressurized air from the compressor. An electrical power supply is in electrical communication with the compressor to power the compressor to generate the pressurized air.

An electric powered pneumatic balancer is provided. In an embodiment it includes: a housing; an air balancer located in the housing; and a compressor located in the housing. The housing includes an opening to receive air to the compressor as it generates compressed air. The compressor is in fluid communication with the balancer which operates in response to receipt of the pressurized air from the compressor. An electrical power supply is in electrical communication with the compressor to power the compressor to generate the pressurized air.

There is provided a crane winch device allowing a suspended load to freely fall due to a load thereof. The crane winch device includes a winch drum around which a rope for suspending the suspended load is wound, braking brake unit that brakes the winch drum, speed-increasing unit that performs speed-increasing assist of the winch drum in a direction of free fall acceleration when a braking force of the brake unit is smaller than a first threshold, and an adjustment unit that adjusts the first threshold.

There is provided a crane winch device allowing a suspended load to freely fall due to a load thereof. The crane winch device includes a winch drum around which a rope for suspending the suspended load is wound, braking brake unit that brakes the winch drum, speed-increasing unit that performs speed-increasing assist of the winch drum in a direction of free fall acceleration when a braking force of the brake unit is smaller than a first threshold, and an adjustment unit that adjusts the first threshold.