Proper maintenance of a single head cap, t-shirts, garments, shoes, and tubular embroidery machine is essential to ensure its longevity and optimal performance. Here are some tips on how to maintain this type of embroidery machine:

1. Keep the machine clean: Regularly clean the machine by removing dust and debris from the embroidery area, the bobbin case, and the needle plate. Use a soft-bristled brush and a lint roller to remove any lint or loose threads.

2. Lubricate the machine: Proper lubrication is essential to ensure smooth and efficient operation of the machine. Lubricate the machine regularly, following the manufacturer's recommendations. Use only high-quality lubricants and apply them sparingly.

3. Check the tension: The thread tension should be checked regularly, especially if you notice any stitching irregularities. Adjust the tension as needed, making sure that the upper and lower threads are balanced.
   

4. Check the needles: The needles should be checked and replaced regularly to ensure that they are sharp and not bent or damaged. Use only high-quality needles that are appropriate for the type of fabric you are working with.

5. Check the bobbin case: The bobbin case should be checked regularly to ensure that it is clean and free of debris. Replace the bobbin case if it is damaged or worn.

6. Calibrate the machine: The machine should be calibrated regularly to ensure that it is stitching accurately and producing high-quality embroidery. Follow the manufacturer's instructions for calibrating the machine.

7. Schedule regular maintenance: It is recommended to have a professional technician perform a full maintenance check on the machine at least once a year. This will help to identify any potential problems early and prevent more costly repairs in the future.

By following these tips, you can ensure that your single head cap, t-shirts, garments, shoes, and tubular embroidery machine is well-maintained and operates at optimal performance.