Posted by Billy NY on February 13, 2015 at 10:27:34 from (104.228.35.235):
In Reply to: rotary mower guestion posted by mite-help on February 13, 2015 at 09:46:26:
I suppose one could bend one of these blades, given the metallurgy, concern of embrittlement or similar, given the speed and mass of them rotating, why would you want to chance that. As is they are more than likely not cutting efficiently, I'd be inclined to leave them on if there was no out of balance problems, significant vibration when engaging the pto or while running it. The rough areas of to cut, whats rough about it, small trees, saplings, terrain with rocks etc. ? These tolerate quite a bit, most of them, but its advisable to skip areas like that or clear, clean up the area before cutting. Small trees and saplings can be reduced if you start with the deck up high, and work down until its too much, makes a lot of noise, lots of impact, shock loads, vibrations, I find its not worth it. Worst case is abusing one til something breaks, oil seals leak etc. Make sure the shear bolt is correct grade, (usually grade 2 on the pto shaft) or slip clutch is correctly operating, your blades might be attached with shear type shoulder bolts, my Rhino SE-6 is. More than you asked for, but I'd replace them to be safe, I have seen how far one of these can toss a loose rock, of cantaloupe size, up over a hedge row, a piece of metal coming out could easily be like a bullet or fragmentation shrapnel.
Here are some photos of bent, worn out blades and the new replacement blades. When I put these on, in the same conditions, 1st cut hay grasses etc. it cut so much more efficiently, and I could run in one gear higher, which says a lot for using good blades and having the mower correctly adjusted to the tractor.
Cutting the ends off the blades is a waste of time, its going to create an out of balance condition, unless you weigh them to be even, and its not going to cut very well at all.
If one was going into really heavy vegetation or similar, possibly a smaller mower, but heavy enough to do the job meaning the gearbox is rated for the power available and then some. A friend has a real heavy duty 5'-0" mower, deck and blades, on the same tractor but harsher conditions, I'd take the 5'-0" mower over my 6'-0" mower on the same tractor every time.
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