HT25 - TRENCHING 49 Machine might lunge when digging starts. Allow 3 feet (1 m) between digging teeth and obstacle. Flying objects thrown by machine may strike people. Wear hard hat and safety glasses. 1. Lower backfill blade to reduce shock when trenching begins. Moving digging teeth will cause death or serious injury. Stay away. 3. Engage digging chain control. DIGGING CHAIN WILL MOVE. Keep everyone at least 6 feet (2 m) from machine, attachments, and their range of movement. p OPERATION 2. Adjust throttle. NOTICES: OPERATION sf1023