I am thinking of buying a used PC 120 but we cannot find the year of the machine, can anybody tell me where it might be found on the machine?
It probably won't say anywhere on the machine. Get the exact model and serial number and call your local Komatsu dealer. If they are anything like the dealer I work for, they should be willing to help you out.
The serial number is supposed to be below the cab on the frame on the right side. Post the serial number and we can tell you the year. Have you looked at the machine yet?