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Faunsdale, AL | Never seen a NewHolland cutter, but some general things to try...........
Make sure the down pressure springs are installed and not broken etc. Also check that the roller that has teeth on it has sharp teeth. Not rounded edges, square edged, like they were sheared out on a metal shear is great. Might have to spend some time with a side grinder and square them up if they're rounded.
Then (carefully) raise the front upper roller with a bar, block it up with a 4x4 or something similar and feel the surface of the rear rollers just in front of the knife head/shear bar. There should be a smooth path with no jutting edges on the lower side of the throat. Usually there is a smooth roller with a scraper on it to keep it clean. Sometimes the scraper needs adjusting downn tigher to the roller so it scrapes clean and does not stick up to catch the crop that's being shoved across it.
Lastly, make sure the knives are sharp and the shear bar is set correctly. If the chopper has long thick knives, the bevel behind the edge is very important. Fox recommended a 7/8" bevel on theirs and it was important to have it. Thin knives' bevel isn't as important and you can't change it anyway. The bevel is important because the feed rolls are pushing the crop in at a constant rate as the knives are passing through it. A properly beveled knife cuts and then the bevel allows the crop to be pushed on in even as the knife is moving across the cut surface of the mat of stalks. A short bevel momentarily stops the progress of the stalks and can break the grip of the feed rolls on the stalks and they "spin out".
Symptoms of problems in the throat and feed rolls is that the stalks are feeding fine and then suddenly they fall flat on the header and the feed rolls just spin on the top of the ones remaining under the front roller. | |
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New Holland 770 silage chopper issue
