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If your rake has a straight rear axle it is a NH 55 rake. If it has the right wheel tucked in close to the rake basket, the rear axle has angles in it, it is newer. There should be a plate on the frame near the gearbox telling you what it is. The gearboxes should be filled with good grease these days. they originally came with oil, but that has been updated. On my 55, I had a dog (the metal lobe) that would wreck the spring in there. Looked good, the dealer even said the lobe did not look wore much, just a tiny bit. But, wrecked 3 springs, so I got a new lobe & spring. Works good now. Think the lobe was $9 a couple years ago. The real problem is the wheel hub is wearing loose on the axle shaft - didn't get enough grease. On the 55 there is nothing to do when it wears out, unless you have a machine shop mill it out & put in a bushing. As this wear gets worse, the dog or lobe does not engage properly & things don't work. There is a dog or lobe on each wheel hub, check them both. Even if one is worn out or spring shot, the other should drive the rake. You must have both out. --->Paul
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