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If it has a detroit and has not been repowered from the AC engine than it should be a 1955. That was the last year of production for that machine. There are parts out there, you have to be patient. I have two of the machines. 1954 HD9B and and 1955 HD9X. The latter is a very rare 9 for they do not know if 40 or 400 were built. Norm Swinford who wrote the book on AC contstruction Equipment has never seen one but for a picture. I have completely restored my HD9B model. Redone the truck frame from stem to stern with replacement Idlers which were full disassembled with new bearins and seals. Full new UC for rollers, new rails, pads, replaced the sprockets, Rebearinged the finals and converted to the HD11 final drive axles and all new seals. Redid all of the steering brake levers bearings and seals. Re manufactured the slide rails for the idlers. Disasembled the clutch and repaird the clutch brake and rebearing all of the internals there and made new shafts. The air cleaner was disassembled and cleaned out. I was surprised at how far straw and dirt got up there. On the 9x there is a replacement motor and the trany has been removed and the replacement is here and being checked out to make sure it is good. Track comming out on an uphill hard turn means that either the track is loose or the rollers and the idler is worn. On the idler check for a bevel on the inner side that will indicate that it has been riding on that side. The idler could also have a bad set of bearing and this will cause idler wobble. On that machine. the truck frame could be adjusted such that it and the idler were aligned properly with the sprocket. That adjustment was done throught shimms on the sprocket. Look at the slide rails for the truck. If the ends are broke look for the pins that hold it in place. There are 4 per side. If they are very deep in the holes than the idler is wobbeling in the truck frame and this will be worse on a hill. When looking at that, check the end play on the idler brackets. There should be no more than 1/8" gap on the top part. Otherwise the bottom slide rail is taking all the hits which is should but the top is not preventing it from moving over the top and wobbeling a bit. Value. The ave value for a tractor like that has been 4500-5500 I would like to see a price closer to 2500 or there abouts. Fully redone they can much higher than that. They are a work horse and are very easy to take apart and fix. Final drive shafts can be repaired and redone at the local machine shop ect. That is impossible to do with many other machines. The engine is easy to fix, parts are cheap and they run forever. Only thing needed is ether to start. If you get it. Put a Turbo II Pre Air Cleaner on top. Detroits are a heavy breather since it is a two stroke diesel. The cleaner keeps the oil bath air clean's oil clean a lot longer and helps to keep the big junk out better. The air cleaner will need to get cleaned out. Drop the pan and look up in it. You will probably find a lot of junk caught on the grates. Look for cracks on the truck frame by the idler. If it is the loader version, then it will probably be cracked and needs to be welded. Sorry I ratteled on so much. You can vist my website www.ibdozing.com and see my machines and ask me any question you want on the machine. I have some parts around and do get other. thanks wk
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