Turning Gear The turning gear is driven by motor through 1. Connector 2. Pinion 3. Shaft 4. Housing 5. Worm Wheel 6. Screw Plug 7. Worm 8. Drain Plug 9. Safety Pin 10. Bearing 11. Shim the splineway on the worm shaft (7). The connector (1) and gear (2) is connected through the safety pin (9). If abnormal torque is transmitted from the scraper blade, the safety pin (9) will be sheared to prevent the scraper blade system from cracking due to overload. 20-126