1. The manufacturer's website: Many hydraulic cylinder manufacturers provide manuals and other documentation for their products on their websites. You can usually find these manuals by searching for the model number of your hydraulic cylinder on the manufacturer's website.
2. Online retailers: Some online retailers that sell hydraulic cylinders also provide manuals and other documentation for the products they sell. You can often find these manuals by searching for the product name or model number on the retailer's website.
3. Engineering websites: There are a number of websites dedicated to engineering topics that provide manuals and other documentation for hydraulic cylinders. Some of these websites include:
* Hydraulics & Pneumatics Magazine
* The Engineering Toolbox
* Machine Design
4. Government websites: Some government websites also provide manuals and other documentation for hydraulic cylinders. For example, the U.S. Occupational Safety and Health Administration (OSHA) provides a manual for hydraulic cylinders on its website.
I hope this helps! Let me know if you have any other questions.