excavator spare parts wholesale

1) According to the damage of the gear ring, determine the position of the fixed hole and the damaged section that needs to be replaced, and then cut the section of teeth to be replaced with gas cutting.   (2) According to the parts of the gear ring that need to be repaired, the insert is processed, or the corresponding part of the other old gear ring is cut out a relatively intact gear tooth under the condition of ensuring the pitch, and the groove shape is cut out at the joint.   (3) Determine the position of the insert fixing hole, punch the hole to fix it in the corresponding part of the gear ring, pay attention to ensure the accuracy of the fixed hole position.   (4) In order to ensure that the weld has higher strength and can withstand greater impact and vibration, the junction 507 electrode with a diameter of Φ4mm is selected, and the electrode should be baked at 250 ~ 350℃ for 1h before use.   (5) Using AX3500 DC arc welding machine DC reverse welding, the current is 130 ~ 140A. (1) Preheat before welding, use 2 large gas welding guns to heat the welding surface to about 200℃.   (2) Using the temper weld method, the latter weld plays a tempering role on the previous weld, which is conducive to eliminating the hardened structure generated by the previous weld.   (3) Because of the large groove, when welding the first weld, it should be welded slightly thinner to reduce the melting width and reduce the carbon content of the steel. When welding, the electrode tilts forward about 15°, straight forward, and pay attention to filling the arc pit when the arc is closed to avoid arc pit cracks. After welding, use a small pointed hammer to quickly hammer the weld and both sides to relax the stress until the weld appears dense pitting. Continue welding when the weld cools down to about 200℃.   (4) The welding method of each weld after the first weld is the same as that of the first weld, the electrode can be slightly pendulum, in order to avoid porosity, do not pendulum too large.   (5) In order to eliminate the hardened structure and stress after welding, the weld and both sides are heated to about 600 ~ 650℃ with oxygen acetylene flame, and the heat is kept for 20min, and then the weld is covered with asbestos, hydrated lime powder or dry sand, and the weld is slowly cooled to room temperature.   (6) Polish the weld with the polishing wheel, so that the tooth ring repair is completed. The process of repairing tooth ring with segment insert is simple, the technical requirement is low, the repair time is short and the repair quality is high. The service life of the tooth ring repaired with the old insert is about 1/3 of the life of the new tooth ring, and the service life of the tooth ring repaired with the new insert is equivalent to the life of the new tooth ring. The method can be used to insert the tooth ring repeatedly, and the economic benefit is remarkable.

The guide wheel is mainly used to guide the track to wind correctly, and to prevent its deviation and deviation.   At the same time, the guide wheel and the tension device work together to adjust the tension of the track, mitigate the impact force from the road when moving forward, and reduce the vibration of the fuselage.   Therefore, the guide wheel is essential in the chassis movement. Operational hour   When working, the guide wheel is easily covered with mud, stones and other debris. If not cleaned up in time, these debris will affect the normal work of the guide wheel, and even damage the wheel body. The operating habits of daily work will also have a greater impact on the wear of the guide wheel. In short, the maintenance of the guide wheel is of great significance to ensure the normal work and extend the service life of the tracked construction machinery.   It should be cleaned regularly, checked for wear and seal status, and pay attention to operating habits to ensure that the guide wheel is in good working condition.   Bear in mind   Keep good habits   For example, walking on inclined ground for a long time and turning suddenly will make the side of the rail link contact with the side of the drive wheel, the guide wheel and the support wheel, which will aggravate the side wear of the wheel edge.   Therefore, long-term slope operation and sudden turning should be avoided as far as possible, and the use of straight line travel and large turns can effectively reduce wear.   After job   After each work, it is recommended to clean the guide wheel with clean water to remove debris and dirt on the surface. The normal operation of the guide wheel is required to have a good seal and internal lubrication.   Bear in mind   Periodic lubrication maintenance   Check the guide wheel float seal and shaft head seal regularly to ensure the seal status inside the guide wheel and ensure good lubrication between the guide wheel shaft and the plain bearing sleeve.   Once the guide wheel seal failure is found, the seal should be replaced or repaired in time to avoid abnormal wear between the wheel shaft and the sleeve due to leakage, and then lead to damage to the guide wheel. When the guide wheel is working for a long time, the tread of the wheel body and the part of the wheel rim will have different degrees of wear.   Bear in mind   Timely replacement   If the guide wheel with serious wear is not replaced in time, it will lose its original effect and even affect the normal operation of the equipment.   Therefore, in each maintenance, it is recommended to check the wear of the guide wheel, and once the guide wheel is found to exceed the wear limit standard, it should be replaced in time.