Always search first by the part number, when available.
If you searched without a part number and received no results, check that you spelled your entries accurately and placed them in the right fields (make, model, and description). Try using other descriptions that might be used to describe the part you want. If your search takes too long or yields too many results, try narrowing it by adding more information to your search. Leaving out a field such as model will give you all occurrences of the that make and that description without regard for makes. Some of these searches can take a long time to complete when there are many records to display.
Remember that the manufacturers sometimes change part numbers, so one part may have multiple part numbers. Tractor-Part has some interchange information and checks for other part numbers or applications that might fit your search. If the part number or application returned is not what you searched for, it is a because of this interchange information. This information does not come from the manufacturers, so completeness and accuracy are not guaranteed. Please check with the dealer before ordering the part.
If you are looking for an engine or engine parts, and you are not using a part number, try searching both application (e.g., Caterpillar D8R) and engine model (e.g., Caterpillar 3406).
Many parts, if not most parts, are not yet inventoried. The Dismantled Machines page lists dealers that are dismantling specific machines. If you have not found your part on the Parts page, search here to find dealers that could have the parts you have been looking for on a machine whose parts have not been inventoried.
The Tractor-Part database is comprised of inventories submitted to us by hundreds of used and after-market parts dealers in many different formats. Our challenge is to present them to you in such a way that you can find your part quickly, easily, and accurately - with or without part numbers. This is our goal. Your feedback is always welcome.