What happens next?

How to order heavy equipment parts and supplies
Refer to your manual.
Note that there are many different types of heavy equipment, and many different manufacturers, but most, if not all, are provided with a basic service manual or owner's manual. Often this is the best place to start.
Identify the manufacturer and model number and year. Regardless of where you begin looking for parts, you will need to be able to identify the manufacturer, the model year, and the model number.