Reply to R4pat:
This week I decided to take a look at the rear end to find the noise I've been hearing, well, take look close look at the final drive gear in the picture, two teeth missing, and thats not all, one of the locks for the shifting forks was dangling, because the bolt and spring that holds it up broke, what kept it from getting messed up worse, I don't know, This broke gear is a straight tooth and a D4 has a curved to tooth, will both the gears interchange? probably going to have to replace the drive gear that runs this one also so the gears don't bind up. I'll be looking for gears if anyone knows of any
Pat,
you need to find a "bevel gear" set. Final drives are on the sides between the steering clutches and the sprockets.
I don't have any parts book to help you , but I was not aware that any of the old CAT tractors had anything other than straight cut bevel gear sets.
You would probably be better off to replace the gears in a set, but you might get by, with careful adjustment, just finding a ring gear ( the large one, also called a crown gear by some folks). I blieve that replacing the pinion gear would involve some disassembly of the transmission beyond that necessary to set up the bevel gear set.
Maybe the gears will interchange with the later tractors.
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time๐