I wouldn't recommend using anything else unless you check with a mechanic at a dealership to see if it is ok. The grease looks a lot like regular tube grease for the grease gun when it is cool, but turns to liquid when it warms up a little. The grease that is used in these machines is a special type that you can pick up at any CaseIH dealer (I'm assuming that you can get it at any New Idea parts dealer as well). If you do this, make sure everything is clean before you open it up, since the grease in the hub will be exposed. If you remove the disc off of a section, there is a hub that is held in place with four allen wrench style cap screws, benieth that hub there will be shims that set the amount of backlash in the gear (remove shims to decrease the backlash). As the machine gets older that hex shaft will actually get a twist in it (and will eventually break). That style of cutterbar has individual gearboxes that all run off of the same hex shaft that runs the length of the cutterbar. I remember there being something weird about setting the first two discs though. I don't have my service manual in front of me, but the discs should be set about 90 degrees from each other. I have a CaseIH 3309 which is the same thing as the NI 5209 with a different paint job.
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