The serial number on Kubota tractors is often stamped into the engine block under the right side head. There might be a small stamped plate there.
2. Check the transmission housing case.
The serial number could also be stamped on a plate attached to the transmission housing.
3. Check the left-hand side of the frame:
Some tractors have a metal tag attached to the left-hand side of the frame, near the front of the engine.
4. Kubota dealer.
If you cannot find the serial number on your tractor, you can contact a local Kubota dealer. They may be able to provide you with the information you need, such as by consulting maintenance records or contacting Kubota directly.