When you say cut 6" I hope you mean.. 6" tall. Most mowers on the market will cut 1" and 2" stuff. 2" green .. 2" woody gets iffy depending on the mower and machine. A 9/2/8 N will handle a 5' hog.. a Naa or hundred series will handle a 6' hog The JD mowers are good and heavy duty.. just like the ford 95x series... i would put them in line with other first rate equipment like bushhog brand and woods. There are economy lines like kodiak, howse, and king cutter that end up doing pretty well, at about half to 3/4 the cost.. and less weight tan the other units. that less weight means they are only medium or light duty.. but they are also easier to tote on an older machine. I have used a 5' king kutter for a number of years now. Iv'e cut 2" woody material with it.. but don't make a practice of it. 1.5" woody is fine.. and green stuff is fine. I can adjust the mower to cut about 1.5" to 2" from the ground. Don't expect a brush mower to de-stump for you.. 1" woody stumps make sharp spears that can find tires.. though most cutters end up splintering wood, not cutting it clean.. that's why you don't want a razor sharp blade.. pluss rocks eat em up worse the sharper they are. A 3/32 flat on a blade cuts just fine. N's do tend to stick to slopes better than others.. however any slope that is questionable should always be traversed up and down.. not sideways. Also.. gearbox hp is the max hp you can feed it safely. A 40hp gearbox doesn't need 40hp to run it.. etc. For instance.. my 26 hp N runs the 40hp gearbox on my 5' cutter just fine. Soundguy
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