Crane

A crane, comprising:

• a crane apparatus;
• a detachable hydraulic cylinder to operate the crane apparatus;
• a hydraulic circuit configured to supply hydraulic fluid to the hydraulic cylinder, wherein the hydraulic cylinder includes:
• a head side oil chamber;
• a rod side oil chamber;
• oil passages;
• joints configured to connect both of the head side oil chamber and the rod side oil chamber to the oil passages;
• a control valve configured to be connected to the hydraulic cylinder through the joints;
• a head side hydraulic detecting section configured to detect a head side hydraulic pressure of the head side oil chamber;
• and
• a rod side hydraulic detecting section configured to detect a rod side hydraulic pressure of the rod side oil chamber;
• and
• a control device configured to determine a connection state between the hydraulic cylinder and the control valve based on the head side hydraulic pressure and the rod side hydraulic pressure in a period until a predetermined time elapses after power supply to the head side hydraulic detecting section and the rod side hydraulic detecting section and hydraulic fluid supply to the hydraulic cylinder are started, wherein
• when the power supply to the head side hydraulic detecting section and the rod side hydraulic detecting section and the hydraulic fluid supply to the hydraulic cylinder are started, the control device limits the behavior of the control valve such that the amount of hydraulic fluid supplied to the hydraulic cylinder is less than or equal to a predetermined value by the time when the predetermined time elapses regardless of the amount of operation of a operation tool for hydraulic cylinder.