When repairing an extended arm excavator, the following points should be noted:

1. 定期檢查：定期檢查挖掘機各個部件的狀況，包括液壓系統、發動機、傳動系統等，確保其正常工作。特別要注意加長臂的連接處是否有松動或磨損，以及液壓油是否充足。

1. Regular inspection: Regularly inspect the condition of various components of the excavator, including the hydraulic system, engine, transmission system, etc., to ensure their normal operation. Pay special attention to whether the connection of the extension arm is loose or worn, and whether the hydraulic oil is sufficient.

2. 潤滑保養：加長臂挖掘機使用過程中需要進行潤滑保養，包括給液壓缸、剪頭、回轉支承等部件添加潤滑油，并定期更換。

2. Lubrication and maintenance: During the use of the extended arm excavator, lubrication and maintenance are required, including adding lubricating oil to hydraulic cylinders, shear heads, slewing bearings, and other components, and regularly replacing them.

3. 清潔與防銹：挖掘機作業環境通常比較惡劣，容易積聚沙塵、泥漿等雜物，因此需要定期清洗機器表面，以防止腐蝕和銹蝕。

3. Cleaning and rust prevention: The working environment of excavators is usually harsh and prone to accumulation of sand, dust, mud, and other debris. Therefore, it is necessary to regularly clean the surface of the machine to prevent corrosion and rust.

4. 高溫注意：在炎熱的環境下工作時，加長臂挖掘機的散熱系統要正常工作，避免高溫導致機器過熱。

4. High temperature precautions: When working in a hot environment, the heat dissipation system of the extended arm excavator should work normally to avoid overheating caused by high temperatures.

5. 維修保養記錄：在維修過程中，及時記錄維修情況和保養日期，以便日后追溯和分析機器的工作狀況和故障情況。

5. Maintenance Record: During the maintenance process, timely record the maintenance status and date for future traceability and analysis of the machine's working condition and malfunction.

6. 軌跡檢查：加長臂挖掘機的軌跡是支撐整個機身的關鍵，要定期檢查軌跡的磨損情況，及時更換磨損嚴重的軌跡。

6. Track inspection: The track of the extended arm excavator is the key to supporting the entire body. Regular inspection of track wear should be carried out, and severely worn tracks should be replaced in a timely manner.

7. 安全操作：維修人員在進行維修時，要按照操作手冊中的要求進行操作，并戴上相應的安全裝備，確保人身安全。

7. Safe operation: When carrying out maintenance, maintenance personnel should follow the requirements in the operation manual and wear corresponding safety equipment to ensure personal safety.

請注意，以上是一些常規維修要點，具體維修時還需要根據具體型號和品牌的加長臂挖掘機的維修手冊進行操作。

Please note that the above are some routine maintenance points, and specific maintenance needs to be carried out according to the maintenance manual of the specific model and brand of extended arm excavator.