Wheel-type working machine and method of controlling the same

A wheeled work machine, comprising:

• a working equipment that is hydraulically driven;
• an oil-pressure cut valve adapted to switch between a supply state in which pressurized oil is supplied to the working equipment and a suspension state in which the supply of pressurized oil to the working equipment is suspended;
• a lock switch that makes the oil-pressure cut valve perform the switching between the supply state and the suspension state;
• and
• a control device that controls the switching of the oil-pressure cut valve, wherein
• the control device includes:
• lock-state judging means for judging a lock state of the working equipment by considering the status of the lock switch;
• traveling-state judging means for judging whether or not the work machine is traveling;
• alert-issuing controlling means for issuing an alert urging that the working equipment be locked by an operation of the lock switch when the work machine is judged to be traveling by the traveling-state judging means and the working equipment is judged not to be in the lock state by the lock-state judging means;
• and
• lock control means for actuating the oil-pressure cut valve to suspend the pressure oil when the work machine is judged to be traveling by the traveling-state judging means and the working equipment is judged not to be in the lock state by the lock-state judging means.

A wheeled work machine, comprising:

• a working equipment that is hydraulically driven;
• an oil-pressure cut valve adapted to switch between a supply state in which pressurized oil is supplied to the working equipment and a suspension state in which the supply of pressurized oil to the working equipment is suspended;
• a lock switch that makes the oil-pressure cut valve perform the switching between the supply state and the suspension state;
• and
• a control device that controls the switching of the oil-pressure cut valve, wherein
• the control device includes:
• lock-state judging means for judging a lock state of the working equipment by considering the status of the lock switch;
• traveling-state judging means for judging whether or not the work machine is traveling;
• and
• lock control means for actuating the oil-pressure cut valve to suspend the pressure oil when the work machine is judged to be traveling by the traveling-state judging means and the working equipment is judged not to be in the lock state by the lock-state judging means.

A method for controlling a wheeled work machine, the work machine including:

• a working equipment that is hydraulically driven;
• an oil-pressure cut valve adapted to switch between a supply state in which pressurized oil is supplied to the working equipment and a suspension state in which the supply of pressurized oil to the working equipment is suspended;
• a lock switch that makes the oil-pressure cut valve perform the switching between the supply state and the suspension state;
• and
• a control device that controls the switching of the oil-pressure cut valve, the method comprising:
• judging a lock state of the working equipment by considering the status of the lock switch;
• judging whether or not the work machine is traveling;
• and
• at least one of:
• issuing an alert urging that the working equipment be locked by operating the lock switch;
• and
• actuating the oil-pressure cut valve to suspend the pressure oil, when the work machine is judged to be traveling and the working equipment is judged not to be in the lock state,
• the judging, issuing and actuating steps being performed by the control device.