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I bought a new Bush Hog SQ720, 6 ft cut, in 1998. This is a nice machine, I've had no problems with it cutting 25 acres of brushy land each year. I have the slip clutch and a stump jumper (disk on the bottom to jump over, rather than catch on stumps etc.) on it . I just lube it each season before use and it has worked great. I pull it with a 52 pto HP IH 574 diesel tractor which is probably about as light as you'd want to go with this particular cutter. Running the PTO at high RPMs for 4 or 5 hours at a time when operating a brush cutter can be hard on a tractor. Be careful to match the machine to the tractor, else you risk wearing out the tractor prematurely. Cutting brush and fields is dusty, dirty work. The tractor's radiator and grill will fill up with leaves, straw, dirt, etc after a day or two of running the brush cutter. It's important to keep this clean. I remove the grill, clean the big stuff out by hand, and use a compressed air sprayer to clean the radiator fins. Don't use water for cleaning, it can clog the fins. When I keep up with the cleaning, I have no tractor over-heating problems. Again, due to the dusty conditions, remember to change the air breather and other filters, and oil regularly. Regarding the other brands, I have no experience with them.
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