1993 models have different parts and are much more expensive to operate. Schumacher and get some of my money back. I called Schumacher to verify the number and he told me he got the number off the post of the machine, I explained to him that this was not the number that I had and He stated that' that was the serial number he got off the machine and had called ASV to verify the year? So I am trying to find out if anyone has the PTO840-JWPDT, so I can perhaps prosecute MR. 1993 model The reason being as the machine I bought from a Troy A Schumacher, was suppose to be a 1997 ASV MD 70, When it broke down after less than 10 hours of operation, I was checking for parts and checked the serial number on the machine and it was PT840-DWDD. One is PTO840-JWPDT, 1997 Model per ASV Corporate search. I am trying to track down two ASV MD 70 Serial #.