I am working on a Toro 455D. I think it was acquired at an auction. I don't have any history on this machine. It is currently sitting in a field of weeds. Couple of flat tires. Needs cleaned. Missing some parts: Blades, deck wheels... ?? I didn't find the Serial # plate. All fluids look good. The motor sounds like it turns over fine, but didn't fire right up with just a few minutes of tinkering. Probably a fuel issue. It looks like it is missing a filter for the engine or something. In the 2nd picture, there is a hose showing that looks like it connects to something and then to one of the other hoses over by the Diesel filler. The 3rd picture shows the back of that panel where the other hose is and where it looks like something is supposed to have two screws to hold it on. Filter or something? 4th picture is looking DOWN on the same area. Hose end showing in the box. Is there something missing off of that connector down there also? or is that something like an OBD connection? Is that big condensor standard? It just looks 'added on'.