How much are you going to use it in real cold weather? What has happened since that crawler was built new lubricants have become available. In this day and age I would not use oil or grease per say. There is a flowable product known as corn head grease which as stated is used on corn heads. I would use it. Deere has it Agco has it and I am sure Case IH also does. However in the final drives use a non detergent oil so as to have better life out of the steering bands. You need to get an operators manual for that machine. I think you  are describing an OC-126 which is the crawler loader version of the OC-12. How about a picture of your unit.