MACHINE WAS DOWN WITH A BROKEN TRACK AND THE RIPPER WAS BEING USED AGAINST A ROCK TO RAISE THE MACHINE UP OFF THE GROUND. WHEN TRYING TO TRACK UP MACHINE THE RIPPER SLIPPED OFF OF THE ROCK CAU SING THE TRACK MASTER LINK TO COME INTO CONTACT WITH THE EMPLOYEE'S FOREARM MAKING A DEEP CUT. THE MACHINE WAS NOT BEING RUN AT THE TIME.