Cleaning a pneumatic derusting hammer involves several steps to ensure that it functions properly and remains in good condition. Here are some steps you can follow:

Disconnect the hammer from the air supply: Before you start cleaning the derusting hammer, make sure that it is disconnected from the air supply to prevent accidental activation.

Remove the rust and debris: Use a wire brush or scraper to remove any rust, debris, or loose material from the hammer's surface. Pay attention to hard-to-reach areas such as the air inlet and exhaust ports.

Disassemble the hammer: Depending on the model of your derusting hammer, you may need to disassemble it to access the internal components for cleaning. Follow the manufacturer's instructions for disassembly and reassembly.

Clean the internal components: Use a clean rag or a soft-bristled brush to remove any debris or rust from the internal components such as the piston, cylinder, and valve. Be careful not to scratch or damage the surfaces of these components.

Lubricate the components: Apply a few drops of pneumatic tool oil to the internal components and reassemble the hammer. Lubrication helps prevent rust and corrosion and keeps the hammer operating smoothly.

Test the hammer: After reassembling the hammer, test it to make sure it is working correctly. Connect it to the air supply and activate it a few times to ensure that it is operating smoothly and that there are no leaks.

Store the hammer properly: Once you have finished cleaning the derusting hammer, store it in a dry place away from moisture and dust. Use a protective cover to prevent damage to the tool.

Remember to wear appropriate personal protective equipment such as gloves and eye protection while cleaning and using the derusting hammer.