Whenever the employer or his insurer and the employe or his dependent shall, on or after the seventh day after any injury, agree on all of the facts on which a claim for compensation depends, but shall fail to agree on the compensation payable, they may petition the department to determine the compensation payable. Such petition shall contain the agreed facts, and shall be signed by all parties in interest. The department or its referee shall fix a time and place for hearing the petition, and shall notify all parties in interest. As soon as may be after such hearing, the department or its referee shall award or disallow compensation in accordance with the provisions of this act.
77 P.S. § 752