A construction machine includes an earth removing implement 20 including: a blade 22 disposed on a base portion frame 21 by using a linkage mechanism 23 and a cylinder 24; a fixed cover 26 positioned above the linkage mechanism 23; a movable cover 27 covering a gap between the fixed cover 26 and the blade 22; and a guide pin 25 that guides the movable cover 27 while the blade 22 is being raised. The movable cover 27 includes a side surface portion 52 having a slot 54 with which the guide pin 25 engages. The slot 54 is formed along the side surface portion 52 that faces the guide pin 25. The guide pin 25 engages with the slot 54 at a lower end position therein when the blade 22 is raised to a highest position as the movable cover 27 is rotated to follow the fixed cover 26.

A mobile device receives a shared access key corresponding to a work machine. An access code is generated from the shared access key, and from a changing value (such as a time-sensitive value). The access code is transmitted to the work machine which, itself, calculates an access code based on the shared access key and based on the changing value. If the access code provided to the work machine and the access code generated by the work machine match one another, then the work machine unlocks corresponding functionality so that the operator can use the work machine.

A construction machine includes a cooling fan (10) and a shroud (11). The cooling fan (10) sends air drawn in via a radiator (30) to an engine. The shroud (11) is disposed on an outer peripheral side of the cooling fan and forms a passage for air to be drawn in via the radiator. The construction machine includes a tank (12) and a cover (14B). The tank (12) is disposed superior to an upper end portion of the radiator and stores cooling water to be supplied to the radiator and the engine. The cover (14B) is disposed openably in an opening (14A) formed in a top surface plate (11B) of the shroud. The tank (12) is disposed at a position adjacent to the shroud (11) on a side closer to the engine side than the cover (14B) is.

Provided is a working machine including a device to be maintained and a winch disposed thereover and enabling a maintenance operation. The working machine includes a base machine, at least one device to be maintained installed at the base machine, and a winch which is driven to wind an operation rope. The winch is attached to the base machine to be pivotable, about a winch support shaft, between a use position at which the winch is used while closing at least a part of a maintenance space over the device to be maintained and a maintenance position at which the winch opens the maintenance space upward to enable the maintenance operation to be performed.

A first pinhole is formed in a first member in a section facing a second member. A second pinhole is formed in the second member in a section facing the first member. A connecting pin is inserted into the first pinhole and the second pinhole from the side of the machine center. A coming-off prevention mechanism includes a coming-off prevention lever. The coming-off prevention lever can abut the inner end surface of the connecting pin. The coming-off prevention lever is supported by the second member to be able to move between an abutting position of abutting the inner end surface of the coupling pin and a non-abutting position of not abutting the inner end surface.

A door locking device for hydro excavation equipment. The door locking device includes a grapple support housing secured to a door of a debris tank, a lower gripping jaw having a lower pin defining a lower axis about which the lower gripping jaw is configured to rotate, and an upper gripping jaw having an upper pin defining an upper axis about which the upper gripping jaw is configured to rotate. The locking device also includes a yoke having a first end coupled to proximate ends of the lower and upper gripping jaw, and an actuator coupled to a second end of the yoke and configured to extend and retract the yoke to cause the lower and upper gripping jaws to rotate in response thereto about the lower axis and the upper axis, respectively.

A door locking device for hydro excavation equipment. The door locking device includes a grapple support housing secured to a door of a debris tank, a lower gripping jaw having a lower pin defining a lower axis about which the lower gripping jaw is configured to rotate, and an upper gripping jaw having an upper pin defining an upper axis about which the upper gripping jaw is configured to rotate. The locking device also includes a yoke having a first end coupled to proximate ends of the lower and upper gripping jaw, and an actuator coupled to a second end of the yoke and configured to extend and retract the yoke to cause the lower and upper gripping jaws to rotate in response thereto about the lower axis and the upper axis, respectively.

There are provided an electric motor (12) that is driven by an engine (8) to generate electric power or assists in a drive of the engine (8) by supply of electric power thereto, a heat exchanger (13) to which cooling air is supplied by a cooling fan (8A), a heat exchanger upstream room (28) that is positioned upstream of the heat exchanger (13) in a flow direction of the cooling air supplied to the heat exchanger (13), and an electricity storage device (30) that stores or discharges electric power. In addition, a radiator (42) for electricity storage device, a cooling pump (43) for electricity storage device and a cooling line (44) for electricity storage device configure a cooling system (41) for electricity storage device that independently cools the electricity storage device (30) aside from the inverter device (34), and the cooling system (41) for electricity storage device is arranged in the heat exchanger upstream room (28).

A cross-link assembly for a dangling worktool may include a frame configured to connect to a grapple, the frame having spaced apart arms; a pin movably engaged with the spaced apart arms, the pin having an abutment portion; and a lock member movably engaged with the frame. The lock member may be configured to engage with the abutment portion and have a lock portion configured to engage with a lock element provided on the grapple.

A flow control apparatus and a flow control method for a construction machine are disclosed, which can perform ground leveling work for smoothing the ground by the self weight of a boom without supplying hydraulic fluid from a hydraulic pump to a hydraulic cylinder. The flow control method for a construction machine including a hydraulic pump, a hydraulic actuator connected to the hydraulic pump, a control valve controlling a flow direction of hydraulic fluid supplied to the hydraulic actuator, a work mode switching valve installed in a flow path between the control valve and the hydraulic actuator to perform switching between a normal work mode and a floating mode, a detection means for detecting a boom-down operation amount of an operation lever operated by a user, an electronic proportional valve controlling a discharge flow rate of the hydraulic pump, and a controller, the flow control method including a first step of determining whether the present mode is switched to the floating mode; a second step of changing the discharge flow rate of the hydraulic pump corresponding to the boom-down operation amount detected by the detection means if the present mode is switched to the floating mode; and a third step of outputting an electrical control signal to the electronic proportional valve so that the hydraulic pump can discharge the hydraulic fluid at the changed flow rate corresponding to the boom-down operation amount.