Jay, I have a '69 150 IH tracked loader with 4-1. Pretty similar to your machine, just a bit bigger (they made them in 100, 125, 150, 165, 175, 250 sizes). I love my machine, I've really worked it hard this past year, and so far no problems with the exception of a ruptured hydraulic line for one of the main lift cylinders (the hose was old and dry rotted). But other than that, it's been great. Of course the machine I bought was pretty much all rebuilt, but it has been holding up to a lot of hard digging and logging and clearing functions just fine (love the 4-1). Since I really haven't had any problems, I can't think of anything special to look for, other than ensuring the basics are good before committing to buy (i.e. good undercarriage, engine, clutches, brakes, tranny, final drives etc). The older machines can be hard to find parts for for certain things, but the 100 is a pretty common crawler, so you should be able to find some new stuff and plenty of used stuff pretty easy. All of the filters for my crawler are available at NAPA and Advance auto parts. Also, since IH was bought out by Dresser and then Case and then Komatsu (??), I doubt that has increased off the shelf parts availability. But these old crawlers can be kept running indefinitely really, you just have to be willing to do a little legwork to get certain parts if they go bad on you. Plus Ive learned that many, many, many things can be refurbished/rebuilt/adapted if they go bad. For instance, sprockets for my machine are apparently no longer available off the shelf. But, you can have new sprocket inserts welded in, or you can adapt another sprocket from a similar sized machine from another manufacturer. The hydraulic loader system is made by Drott, which is also out of business. But all of the hydraulic cylinders, seals, packings and valves are pretty universal and are available from many manufacturers. Anyway, I wouldn't let the age or the make of the machine scare you away, but you have to keep in mind that getting parts for it won't always be a simple matter of walking into a dealer and slapping a bunch of money on the counter top. You may have to hunt some stuff down, refurbish what you have (which is usually cheaper than new anyway), and/or adapt components from other crawlers. But in return, you get a good, hard working, inexpensive crawler that can keep you going a long time. If you end up getting the 100, check out the Redpower site at: Link These guys will help you keep your crawler running and finding parts if you end up needing them. Most of the guys there have TD crawlers from the 30's and 40's that they run and work. Good luck
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