The wear of driving gear teeth often occurs at the root, front and rear sides, left and right sides and top of the gear teeth. When the bulldozer is moving forward and the track pin sleeve is lifted by the wheel teeth, the wear occurs on the front side of the wheel teeth; otherwise, when the bulldozer is running backward, the wear occurs on the rear side of the wheel teeth. When the caterpillar is too loose, the caterpillar deviates, and the gear teeth impact the side of the chain rail joint, the side wear of the driving wheel teeth will be caused.Another wear form of the drive wheel tooth is wear on the top. Top wear occurs when the teeth of the tracked and driving wheels are filled with viscous material and the engagement relationship between the driving wheels and the tracked pin sleeve is changed. As the bulldozer moves forward, marks are made on the top of the back of the teeth on the drive wheel side and on the side of the pin sleeve.
The teeth of rotary drilling rig and bulldozer are mainly forged, because they are three or two teeth in one piece, and finally they have to be assembled into a wheel, so the processing technology and technical requirements are much stricter. Bulldozer gear block requirements: gear block steel should comply with the provisions of GB / T 3077 40MnB or 35MnB alloy steel materials, but also allows the use of mechanical properties not less than the above grade of other materials; gear block steel carbon content should comply with the provisions of GB / T 3077; its sulfur and phosphorus content should be less than 0.035%. The contents of non-metallic inclusions, brittle inclusions and plastic inclusions in steel shall conform to the requirements of grade 2.5 stipulated in GB/T_10561-1989; the heat treatment hardness of gear blocks shall be HCR46-56; the forging ratio of gear blocks shall be greater than or equal to 2; the starting inclination of the die shall be 3 degrees to 5 degrees; and the limit deviation of the tooth profile accuracy of forgings from the standard tooth profile template shall be controlled. It is within + 0.7 mm.