I'm working on a technical manual project for industrial machines and the original documents have some warranty warnings and statements at the beginning. We decided to keep them on the new documents but there were some objections from the team members. They've suggested to separate the warranty chapters from the main manual and handle them as individual documents. Their argument was that the warranty topic is something different from the user's manual and that it should be presented to the customer in a different format. The final decision was to keep them in the main manuals because most of their competitors do include these chapters in their manuals, too.
My question is if there are some general rules or common practices on warranty statements in product documentation? How do technical writers handle this subject?