Hey I’m new to this and I’m curious to know what year dozer this d3 is I’m looking to buy it but not sure of the year sn is 79u5590 if anyone can tell me that would be great and thank you in advance
79U production started in 1973, so I would imagine 79U5590 will be somewhere arround the 1976-78 time frame. Others with more detailed information might be able to date it more closely.
That's a 1979 model near end of production at 79U6101.