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Main monitoring items in the manufacturing process of the four types of locomotives: 1. Whether the standard external components selected for each locomotive are purchased in accordance with the technical requirements specified in the drawings. 2. After purchase, each hydraulic cylinder should be tested for pressure resistance, internal leakage, and to verify whether the sealing rings are suitable for use with water-ethylene glycol. 3. Check whether the excess amount without key coupling meets the requirements; whether the hot-fitting pressure is sufficient; and ensure that a supervisor is present during assembly. 4. Pre-assembly in the factory is carried out in accordance with the requirements of the drawings, and all dimensions and travel distances are carefully checked to ensure that they meet the specifications and process requirements outlined in the drawings. 5. Hydraulic station inspection: (1) Visual quality condition. (2) Whether there is any leakage at the experimental pressure. (3) Each circuit is connected to an actuator (hydraulic cylinder, motor) for a performance test (performed at rated pressure). 6. Urge manufacturers and various component producers to assign part numbers: for use during equipment assembly. 7. Supervisor: At the manufacturing plant, check whether all components are present according to the drawings; for key components and external parts, conduct personal inspections and keep proper records. 8. During the supervision process, the supervisor must keep thorough records, and provide written feedback on relevant issues to the manufacturing factory and the relevant leaders of the institute; any major issues that affect quality or progress must be reported promptly. 9. The supervisor must be aware of the overall progress requirements for the project under supervision. 2. Prepare a schedule for the production project to remind the manufacturing factory of the processing timeline. 3 It is necessary to understand in advance the drawings related to this production project, be aware of the technical challenges, key aspects, and relevant technical requirements, and consult with the designers if needed. 10. All inspections do not relieve the manufacturer of its responsibilities; both non-final inspections and the final inspection are subject to the manufacturer’s judgment. 11. Check whether lubricant has been added to each bearing as specified. 12. Conduct design briefing.