Maintaining industrial sewing machines is important in order to ensure they continue to run smoothly and reduce downtime. 

Here are some best practices to keep in mind: 

1. Regular cleaning: Depending on how frequently you use it, cleaning the machine on a regular basis can help prevent dirt and debris from building up and causing damage to the machine. Clean the machine's exterior, bobbin case, and the area under the needle plate.
2. Lubrication: Lubricating the machine's moving parts (gears, rotary hook, and other) is important to keep them running smoothly. Refer to the machine's manual for the recommended lubrication schedule and type of lubricant to use. Unless your machine has automatic lubrication, it's always recommended to oil your sewing machine at least once a week.
3. Check and replace worn parts: Over time, parts of the machine (especially the hook) can wear out and need to be replaced. Once in a while check for worn or damaged parts, such as the hook, bobbin case, presser foot, tension springs, and feed dogs, and replace them as needed.
4. Inspect the machine before use: Before starting a sewing job, visually inspect the machine for any issues or problems such as a broken needle fragments, or old jammed thread. Check for thread jams, broken needles, or other issues that could cause downtime.
5. Proper threading: Incorrect threading can cause tension problems and breakage of thread, so ensure the machine is threaded correctly.
6. Properly store the machine: When not in use for a prolonged time, store the machine in a clean, dry place to prevent rust or other damage.
7. Regular Maintenance: Schedule regular maintenance with a local experienced sewing machine mechanic to keep the machine running at peak performance. This could include replacing worn parts, adjusting machine settings and ensuring that all components are properly lubricated.

By following these best practices and performing regular maintenance, you can help prevent downtime and prolong the life of your industrial sewing machine. It's also important to consult the machine's manual for specific instructions and recommendations for your machine.