Quick-change device

A method of monitoring lock status of a quick-change device for automatically changing an attachment on a construction machine, the method comprising:

• providing the quick-change device with first receptacles disposed on one side of a support for receiving a first coupling element, second receptacles disposed on the other side of the support for receiving a second coupling element, with the second receptacles having at least one locking element which moves between a release position for coupling or uncoupling the attachment and a locked position for holding the attachment in place on the quick-change device;
• displaying the lock status on a display device disposed on the support,
• wherein the display device comprises an electrical lock status indicator and an electrical control unit which activates the lock status indicator in an extended locked position of the locking element and deactivates it in a retracted release position and an extended position of the locking element different from the locked position.