help with what year my powermax is

[phillobbezoo 139]

hey guys im a new member. i have a powermax but im not sure if its the 4041 4040 or 9020 and i cant seem to figure out what year it is. It has dual front hydrolic hook ups, 3 pt and rear pto. When i put the serial number in it comes up as a 9020, but im not sure thats right. i was told when i bought it that it was 72 or 73 and i dont know what year they strated making the 9020 any help would be greatly appreciated

[wilm169 1]

Try this page with you MFG #. http://www.simpletractors.com/Main/made_when.htm