The installation of the excavator long boom and arm is a professional technical activity, which is related to the safety of use and work efficiency. In this article, Hitech Machinery will share and summarize the process of correctly installing the excavator long boom and arm.



  1. Operate the excavator to retract the large and small arms, stop the operation of the excavator and remove the bucket, bucket cylinder and connecting rod assembly at the front end of the excavator’s original forearm;
  2. The correct installation method is to take out the rod head pin of the stick cylinder; fix it with iron wire after retracting the stick cylinder, and do not let the cylinder rod slide out to avoid injury;
  3. Take out the end pin of the stick cylinder; use a crane to take out the stick cylinder;
  4. To correctly install the excavator long boom and arm, take out the fork pin of the boom and take out the standard forearm;
  5. Take out the rod head pin of the boom cylinder (the middle pin of the boom), take out the seat pin of the boom, and take out the standard boom.
  6. Then use a crane to align the excavator long boom and arm with the boom seat, put the boom seat pin in, and then put the boom oil cylinder head pin into the boom middle hole.
  7. Use a crane to hoist the forearm, align it with the position of the fork of the boom, and drive the pin of the fork of the boom.
  8. Align the stick cylinder with a crane, and install the end pin of the stick cylinder and the top pin of the stick cylinder.
  9. Follow-up is the same as installing the arm cylinder, install the bucket cylinder, and then install the connecting rod assembly and bucket.
  10. The hydraulic hose joint is flanged and fastened with hexagon socket head cap screws M10, using suitable tools and proper tightening force 49N*M. Before tightening, make sure the O-ring is intact and placed correctly.
  11. The excavator long boom and arm adopts a centralized filling method. There is a centralized filling block at the boom seat, and the lubricating grease is directly added to the centralized filling block. It is best to overflow the lubricating grease at the filled place.
  12. After the installation of the extended arm is completed, a no-load test run is required. The no-load test run is carried out according to the method required by the excavator manufacturer. When running, pay attention to whether there is any jamming, whether there is any looseness in the fastening parts, and whether the hydraulic oil circuit is normal.



The above is the description of the installation process of the excavator long boom and arm, I hope it can be helpful to everyone. I also hope that you will pay attention to our follow-up updates, and we will continue to bring you more content.