Got the shop manual and parts book from Mary-Ann last week. It's finally time to get into rebuilding my OC-4. Going to get a new battery and pull the carb and clean it and see if I can get it running. The transmission needs some work and the tracks and sprockets aren't the best. The engine ran well when it was used last except the center cylinder burned oil. Going to do a complete overhaul on the engine but it would be nice to get it running so I can get an idea of anything on the tractor that needs attention while the engine is out. Have several projects around the property that requires a bulldozer. My father did an incredible amount of work with that little dozer. Am looking forward to having it running again. Keep you posted on the project.