The daily maintenance and repair precautions of stage hand - operated chain hoists have similarities to those of stage electric chain hoists, but they also have their unique aspects. The following are the specific details: ### Precautions for Daily Maintenance 1. **Cleaning Work**    - Regularly wipe the surface of the hand - operated chain hoist with a clean soft cloth to remove dust, oil stains, and debris, preventing them from entering the interior and affecting performance. Pay special attention to cleaning parts such as the chain, sprocket, and gears.    - For stubborn oil stains, an appropriate amount of special cleaning agent can be used, but avoid contact between the cleaning agent and the lubricated parts of the chain to prevent affecting the lubrication effect. 2. **Lubrication and Maintenance**    - Lubricate the chain regularly. Generally, after every 50 - 100 working hours or after running a certain distance, apply special chain lubricating oil to ensure that each link of the chain rotates flexibly, reducing friction and wear.    - Also, regularly add an appropriate amount of grease to the transmission parts of the hand - operated chain hoist, such as bearings and gears, to reduce mechanical losses and extend the service life. Grease can be replenished every 200 - 300 working hours. 3. **Component Inspection**    - Before each use, carefully check whether the hook has deformation, cracks, wear, etc., and whether the opening degree of the hook is within the normal range. If the hook wear exceeds the specified standard (usually 10% of the original size), it should be replaced in a timely manner.    - Check whether the chain has elongation, deformation, rust, loose chain pins, etc. When the chain elongation exceeds the specified length (generally, the length of 8 chain links should not exceed the specified value of 8mm), adjustment or replacement should be carried out. At the same time, ensure that the chain tension is appropriate, avoiding being too loose or too tight.    - Check whether the braking device of the hand - operated chain hoist is sensitive and reliable, and whether the braking gap is appropriate. This can be done by manually pulling the hand - operated chain and observing the braking situation to ensure that when the pulling stops, the heavy object can remain in place reliably. 4. **Other Inspections**    - Check whether the hand - operated chain has phenomena such as distortion, deformation, and wear, and whether the chain links rotate flexibly. If there are any problems, they should be dealt with in a timely manner to prevent chain jamming during use.    - Check whether the housing of the chain hoist and its connecting parts have looseness, cracks, etc., to ensure the stability and safety of the overall structure. ### Precautions for Repair 1. **Professional Repair Requirements**    - Maintenance personnel should have certain mechanical repair knowledge and skills, and be familiar with the structure and working principle of the hand - operated chain hoist. If the electrical control part is involved (such as an electric - hand - operated chain hoist), the maintenance personnel should also hold relevant electrician certificates. 2. **Safety Measures**    - Before repair, the power supply must be cut off (if it is an electric - hand - operated chain hoist), and a warning sign saying "Do not switch on, someone is working" should be hung at the power switch. For a hand - operated chain hoist, ensure that the repair is carried out under no - load and safe conditions.    - Place the heavy object on the hand - operated chain hoist smoothly on the ground or take reliable support measures to prevent the heavy object from falling and causing casualties and property losses during the repair process.    - The repair site should be kept clean, open, and have good lighting conditions, so that maintenance personnel can operate clearly and avoid repair mistakes or safety accidents caused by environmental factors. 3. **Standard Selection of Spare Parts**    - During repair, use original spare parts that match the model of the hand - operated chain hoist or certified qualified substitutes to ensure that the quality and performance of the spare parts meet the requirements. Do not use counterfeit, shoddy, or non - compliant spare parts to avoid affecting the safety and reliability of the hand - operated chain hoist. 4. **Detailed Repair Records**    - Record in detail the content of each repair, the replaced spare parts, the repair time, the maintenance personnel, etc., and establish a repair file. This can facilitate tracking the repair history and operation status of the hand - operated chain hoist, provide a reference for subsequent maintenance and repair, and help to detect potential problems in a timely manner. 5. **Rigorous Testing and Commissioning**    - After the repair is completed, comprehensive testing and commissioning should be carried out. First, conduct an no - load test. Pull the hand - operated chain to check whether the hoist runs smoothly, whether there are any jams, abnormal noises, etc., and whether the braking device is sensitive and reliable.

   - Then, conduct a load test. Select an appropriate heavy object for the test according to the rated load of the hand - operated chain hoist. During the test, observe the operation of the hoist under different loads, including whether lifting and lowering are normal, whether the braking is effective, and whether there are problems such as abnormal heating and deformation of each component. Only after all tests are qualified can the hand - operated chain hoist be put into use.