Most likely it is the Perkins 4.236 Diesel that is what the factory was using as of that vintage. If it runs and drives and all you feel it needs is track belting
then it most likely will be a good rebuild. New track belting for the machine
runs 475.00 per belt times six. it may have the Double D grousers or the Flat grouser The flat grousers are more expensive. That machine should have final drives hard to see but if you look in at the tub by the front drive hubs there should be a oval case next to the tub. you want these if possible they help extend your differential and axles. before they started using the finals it was not uncommon to break the front drive axles. if the machine was to carrier a heavy load through rough terrain. by heavy they were made to carrier 6000
pounds on the rear deck. we have mounted core drilling rigs to back of some of these units. but then they would add the pipe and the mud and alot of extras and pretty soon they are carrying 10,000 pounds with final drives they are not rated that high but you can do it. without it puts to much strain on the axles and differential.
we have included a picture of some Double D dent tracks
Big Al how many Krusty's is 10,000 pounds