Installing a new roller on your printing press requires some careful steps to ensure that the new roller is properly aligned and installed. Here are some general steps to follow for installing a new roller:

Remove the old roller: First, remove the old roller from the press. Make sure to follow the manufacturer's instructions for removing the roller, as different presses may have different methods for doing so.

Clean the roller shaft: Once the old roller is removed, clean the roller shaft with a soft cloth to remove any debris or residue that could interfere with the installation of the new roller.

Prepare the new roller: Make sure the new roller is properly sized for your press and that it is clean and free of any debris. Some rollers may come pre-assembled, while others may need to be assembled before installation.

Align the new roller: Carefully align the new roller with the roller shaft, making sure that it is properly seated and centered. Use a level or other measuring tools to ensure that the roller is aligned correctly.

Tighten the roller: Once the new roller is properly aligned, use the manufacturer's recommended torque setting to tighten the roller onto the shaft. Be careful not to overtighten the roller, as this can cause damage to the press or the roller.

Test the new roller: After the new roller is installed, run some test prints to ensure that it is properly aligned and that the ink is being transferred correctly. Make any necessary adjustments before resuming normal printing.

It's important to follow the manufacturer's instructions and guidelines for installing new rollers on your press, as different presses may have specific requirements and procedures. If you are not comfortable installing the new roller yourself, consider hiring a professional to do the job for you.