Agricultural machinery broken bolt how to take out
September 04 02:28:34, 2025
1. First, remove the sludge and debris from the broken surface of the bolt. Use a center trowel to break up the center section of the bolt. Then, use an electric drill to create a pilot hole with a diameter of 6 to 8 mm at the center of the broken section. Make sure the hole is drilled through completely. Once the small hole is made, replace the drill bit with one that has a diameter of 16 mm and enlarge the hole further. This will provide enough space for the next steps.
2. Take a welding rod with a diameter of 3.2 mm or smaller. Use medium to low current settings to perform surfacing welding, starting from the inside and moving outward along the broken bolt’s hole. Begin the welding process from the top of the bolt and gradually build up the weld material. Start the arc carefully to avoid damaging the outer wall of the broken bolt. Continue welding until you reach the upper end of the bolt. Then, create a cylindrical buildup around the hole, with a diameter of 14 to 16 mm and a height of 8 to 10 mm. This will help in gripping the bolt later.
3. After completing the surfacing, gently tap the end face of the welded area with a hand hammer. This action will cause the broken bolt to vibrate axially. The heat generated during the welding process, combined with the subsequent cooling and vibration, will help loosen the bond between the broken bolt and the threads of the component.
4. Carefully observe the area after tapping. If you notice signs of iron rust or debris coming out of the fracture, it indicates that the bolt is loosening. At this point, place an M18 nut on top of the welded area and weld it securely to the surfacing. This will create a solid base for removal.
5. Once the welding is complete, allow the assembly to cool down. Then, use a pipe wrench to grip the nut and twist it back and forth. While doing so, lightly tap the nut with a small hand hammer. This combination of twisting and tapping will help dislodge and remove the broken bolt from its housing.
6. After successfully removing the broken bolt, use a suitable thread chaser or tap to clean and restore the threads in the hole. This step ensures that any remaining rust or debris is removed, allowing for a smooth reinstallation of a new bolt if needed.