The maintenance of stage electric hoists requires professional knowledge and cautious operation. The following are some precautions during maintenance: Safety Precautions - Power - off Operation: Before any maintenance work, be sure to cut off the power supply of the electric hoist first, and ensure that the power switch is in a locked or tagged - out state to prevent accidental energization from causing personal injury or equipment damage. - Safety Protection: Maintenance personnel should wear necessary personal protective equipment, such as safety helmets, safety shoes, gloves, etc. If working at heights is required, a safety belt should also be fastened, and the height - climbing equipment should be ensured to be stable and reliable. - Set Warning Signs: Set obvious warning signs around the maintenance site, such as "Under maintenance, no operation allowed", etc., to prevent unauthorized personnel from approaching or misoperating. - Insulation Testing: After the maintenance is completed and before reconnecting the power supply, an insulation resistance tester must be used to conduct an insulation test on the electrical system of the electric hoist to ensure that the insulation resistance meets the requirements and prevent electric shock accidents. Maintenance Operation Precautions - Familiarize with Drawings and Documents: Maintenance personnel should be familiar with the structure, working principle, electrical control schematic diagram and other relevant technical documents of the electric hoist, so as to accurately judge the cause of the failure and carry out maintenance operations. If they are unfamiliar with the equipment, it may lead to improper maintenance or cause new problems. - Use Correct Tools: According to the maintenance tasks, use appropriate tools and instruments, such as wrenches, screwdrivers, multimeters, etc. It is prohibited to use damaged or mismatched tools to avoid damaging the equipment or causing personal injury. - Standard Disassembly and Assembly: When disassembling the components of the electric hoist, follow the specified sequence and methods to avoid forced disassembly that may damage the components. The disassembled components should be properly stored and marked for correct assembly. During assembly, ensure that all components are installed in place, and tighten the fastening bolts with the specified torque to prevent looseness or over - tightening from affecting the equipment performance. - **Cleaning and Lubrication**: During the maintenance process, clean all components of the electric hoist to remove dust, oil stains, iron filings and other debris. At the same time, lubricate the parts that need lubrication appropriately according to the usage requirements of the equipment to reduce wear and ensure the normal operation of the equipment. - Precise Debugging: After the maintenance is completed, the electric hoist needs to be debugged to check whether its various performances have returned to normal, such as whether the lifting, lowering, and running speeds are stable, whether the braking is reliable, and whether the limit switches are sensitive, etc. Observe the operating status of the equipment carefully during the debugging process. If there are any abnormalities, stop the machine in time for inspection and troubleshooting. Precautions for Spare Parts and Records - Use Original Spare Parts: Try to use spare parts produced by the original manufacturer for replacement to ensure the quality and compatibility of the spare parts. Using non - original spare parts may affect the performance and safety of the electric hoist. - Record Maintenance Information: Record in detail the information of each maintenance, such as the maintenance content, replaced components, maintenance time, maintenance personnel, etc., and establish a maintenance file. This helps to track the maintenance history of the equipment and provides a reference for subsequent maintenance and troubleshooting.

- Check Spare Parts Quality: Before replacing spare parts, carefully check the quality of the spare parts to see if there are any defects such as damage, deformation, or cracks. Spare parts with quality problems must not be used.