955L Serial number ?

I Know that there must be a resource here that has this info but I can not seem to find it. I am working on a 955 serial number 85J8713 and I would like to know what year it was made. I thought I would have a bunch more questionsbut I found the manuals and parts books in the shed. I don't think the fluids have been checked in years so this could be an adventure! There was a post on a machine like this that helped me out month or so ago and thanks in advance. JEFF
PS I am still into my 212 brake job ...another post to come.....😊

hello jeffscarstrucks ,the book i have shows your 955l 85J8713 being built in 1974, i see that the 955k is a updated to 955L at serial number 85j4672 ,the 955k has a d330T@115hp and the 955L has a d3304@130hp ,bruce oz

Thanks Bruce, I thought it was a little older than that so it is good to know. This thing definitly has more horse power than tracks as it will dig itself in pretty quickly...or maybe it is my lack of experience! Thanks again,JEFF