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I have a 60's International crawler (TD9B) and the rollers on it are lubed with 90W gear oil. The way you are supposed to lubricate them is to remove the pipe plug and insert a needle injector that must be about 6 inches long or so (to get to the center of the roller). You are not supposed to simply pump oil directly into the plug opening, it should be injected into the center of the roller using the needle. Since I didn't have one of those needle injectors, I built one out of small diameter copper capillary tubing used for oil pressure gages (available at NAPA). After rigging it up with various brass adapters I connected it to a piece of plastic tubing and then to an ordinary hand oil pump can. It's a bit of a contraption but it works ok. If the seals on your rollers are starting to go (i.e. the oil is leaking out after you fill the rollers), they have a special roller lube which apparently is a 50/50 mixture of 90W oil and grease. I haven't used it personally, but I've heard about it. It's a thicky syrupy substance that provides good lubrication, and is less likely to seep past the old seals. You could probably mix up your own batch if you can't find it, but I doubt the hand pump described above would deliver enough pressure to get it through a needle injector. The zerk fittings sound ok, I've talked with some guys who do this with good success. But after looking at my crawler I would think they would get sheared off in a hurry without some kind of steel cover over them. Good luck...
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