Maintenance and service manuals for LeyNow vacuum pumps can usually be obtained from the LeyNow company's official website, in the documentation that comes with the product, or by contacting the company's customer service department.

Official website: Many device manufacturers provide user manuals, technical specifications, and maintenance guides for their products on their official websites. You can visit LeyNow's official website and look for relevant manuals in its "Support" or "Document Downloads" sections.

Product Documentation: When you purchase a LeyNow vacuum pump, it usually comes with a user manual or maintenance manual. This document will detail how to properly operate, maintain and maintain your vacuum pump.

Customer Service: If you cannot find the manual you need through the above channels, you can contact LeyNow's customer service department directly. They can provide an electronic copy of the manual or guide you on how to obtain the required documentation.

Please make sure you have the latest manual for the specific model of vacuum pump you are purchasing, as different models and products may have different maintenance requirements and procedures.