What documents should I request from a supplier before ordering?

The point of requesting documents is to make claims checkable. A list of certificate names does not do that; a specific document naming a specific machine and a specific issuer does.

Start with the specification sheet, because every other comparison depends on it. Then, where the category requires it, the declaration of conformity — and check that it names the machine and the standards. Add the wear-parts list, since it determines whether you can maintain the machine locally. Add the packing and loading plan, because that is what a freight quote is built on.

On the commercial side, ask for the quotation with its exclusions stated explicitly, plus the trade term and validity period. Where a document cannot be provided, that is itself useful information: it tells you which claims to stop relying on.

We do not assert that a route holds any particular certificate. We obtain what the route can provide and tell you the document name and the issuing party, so the decision rests on verifiable paperwork rather than on assurance.