Topping up a lubricant in an industrial machinery?

THE 4 KEY RULES: Check that you are using the same oil or grease as the lubricant already in use in the machine.
Use a clean container to transport the oil or a different grease pump for each grease type.
Clean the top-up area in order to keep all pollution generated by the top-up operation to a minimum.
Adhere to the recommended quantities and levels.