When used properly, the horsepower rating of the gear box in meaningless for practical purposes. Some equipment sellers post the max. power the box is rated for before breaking point, and a few others rate how much power the box can be run on a sustained basis and still last as long as it was designed for. A cheaper brush cutter will have a box with a shorter projected lifespan than an expensive one the same size.
The idea of too big a tractor hurting a less rated gear box escapes me. They all have shear pins or slip clutchs. Most makes say nothing in the warranty about being voided with too big a tractor. They DO void the warranty if the wrong shear pin is used, OR the slip clutch gets tightened up too much. I.e., if the box is rated at 50 horsepower, and the slip clutch is designed to slip beyond that, a 100 horse tractor won't hurt it a bit. Under normal circumstances it takes X amount of power to run X size of cutter in H high brush - regardless of how much power potential the tractor has.
King Kutter, for example, sells a 6 foot cutter with a choice of a 40 horse, 60 horse, or 80 horse gear-box. All use the same amount of power, but the bigger the box, the longer it's going to last under heavy use.
Now, having enough power is a different issue. Figure somewhere at least 6 PTO horsepower per foot to be in the ball-park for all-around work. Many of the warrantees DO state that warranty is void if the unit it damaged from lugging (being underpowered or run too slow).
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