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Nick, Your TO-20 is up to the task. You are right the tall grass is overwhelming the finish mower. A TO-20 will handle a 5 foot rotory cutter (bush Hog) with no problem. But you do need to keep the ground speed down to let it cut. When I have my rotory cutter set at 6 inches I can do the July cutting 4 to 5 foot high grass and briars and do most of the place in 2nd, but to get a good cut I drop it down to 1st gear. My rotory cutter set at 4" and I must slow down to 1st and then take some cuts at half width to keep the enge from bogging down. I have been cleaning out the pasture that was "Let go" and it has 1"-4" dia. tulip trees in it. I run over and chop up any tree up to about 3" I have even run down 8 foot tall black berry canes patches 15 feet in diameter. I think your problem is that the finish mower is just not made to cut grass that tall. A good rule of thumb is to consider if a push mower would handle it. if not then the finish mower will also have problems. To get through it with the finish mower take small cuts in 1st gear, or get, rent, hire a rotory cutter.
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