Hit A Stump
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    Hit A Stump

    So with only 5 hours on my new X350, I hit a stump and bent the deck. The mower shut off immediately, but when I fired it back up and turned on the mower deck I heard metal crashing together. I shut it down and took the deck off and saw that the blades were hitting and figured I bent one. I replaced the blades and they were still hitting. Then noticed the blade on the discharge side was out of level by almost a 1/4" and the paint was cracked on top of the deck by the spindle. I pulled the spindle and did some banging and prying and got it back to where it should be. Im a little surprised at how easily it bent. I have the accel 42 deep deck. I thought this was supposed to be a heavier duty deck? Has anyone else had this experience?
    etcallhome, jdforever and JD4044M like this.

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    2 ounces at 18,000 FPS (blade tip speed) gives almost 600,000 ft lbs of energy. That will take out a heavy duty deck too.

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    jgayman's Avatar
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    Quote Originally Posted by rydplrs View Post
    2 ounces at 18,000 FPS (blade tip speed) gives almost 600,000 ft lbs of energy. That will take out a heavy duty deck too.
    That FPS seems a bit high for a X300. A X300-series with a 42-inch deck has a blade rotation speed of around 2900 RPM.
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    In the last 15 years or so, I can't even think how many stumps I've hit with the 48 Edge deck on my Z445, and before that the 48C deck on my LX277AWS. My decks have really taken a beating. I don't know if they're making them differently these day but mine work as well as the day I brought them home.
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    regardless of rpm's, it did damage. When I put the new blades on, they were actually overlapping by almost an 1/8". It was at that point that I knew I had a problem. I hit all kids of things with my old craftsman and never had a problem like this. I guess 20+ years ago they used better steel. I'll be more careful going forward.
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    Take micrometer and measure your current deck to the old deck if you still have it. You will find it thinner. Plus I don't think they use the same mix of steel and heat treating like they did a few decades ago.
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    Quote Originally Posted by jgayman View Post
    That FPS seems a bit high for a X300. A X300-series with a 42-inch deck has a blade rotation speed of around 2900 RPM.
    And the rotational weight was kept minimal to illustrate the idea. I think residential mowers are about 3000fps slower then commercial but I donít know which is 18k. Then there is the variable of stopping distance, and where the impact was on the blade.

    I donít intend to be confrontational, I just want to show it was a conservative guesstimate if the force involved.
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    Old Pa-pa Old Cajun's Avatar
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    Quote Originally Posted by rydplrs View Post
    2 ounces at 18,000 FPS (blade tip speed) gives almost 600,000 ft lbs of energy. That will take out a heavy duty deck too.
    Think ya need to divide by 60 again to give FPS.

    205 MPH blade tip speed = 1082400 Feet per hour /60 = 18040 feet per minute /60 = 300.66 feet per second.

    Did this when a little 1.92 ounce piece of oak stick (stick approx. 1" diameter and 6" long, approx. 1.92 oz.) blasted thru plastic deflector shield on my Z Trak.

    Figured out the stick hit with 168.55 foot pounds of energy using ballistic formula.

    Lots more Kinetic energy wrapped up in a powered up mower blade than a free flying little stick me thinks.
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    Quote Originally Posted by Old Cajun View Post
    Think ya need to divide by 60 again to give FPS.

    205 MPH blade tip speed = 1082400 Feet per hour /60 = 18040 feet per minute /60 = 300.66 feet per second.

    Did this when a little 1.92 ounce piece of oak stick (stick approx. 1" diameter and 6" long, approx. 1.92 oz.) blasted thru plastic deflector shield on my Z Trak.

    Figured out the stick hit with 168.55 foot pounds of energy using ballistic formula.

    Lots more Kinetic energy wrapped up in a powered up mower blade than a free flying little stick me thinks.
    Your correct on the failed conversion. It still comes out to a rifle shot of energy with decent rotational weight, then you add the other blades and shafts connected to in the system and itís capable of damaging any deck made.
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    I just accepted delivery on an X739, and spent a number of weeks prepping the lawn in anticipation of it's arrival, as well as a BUNCH of tree removal and service work. My hands are still sore from ax-ing and using a large sawzall to get rid of all of the roots and stumps on the property, filling multiple large trash containers full of stump pieces and roots in the process. I filled a number of holes with new topsoil as well (the lawn in total got 28 tons in a larger scale landscaping/remodeling project) as the spots where the stumps were removed left some sizeable holes and low spots, so I wanted to smooth those out as well. I burnt up a whole six pack of those Milwaukee "The AX" footlong blades in the process in cutting out what the stump grinder from the tree service missed, prepping the lawn, driveway boundaries, and new flower beds for their new, treeless role. I am very impressed with the Milwaukee "Super Sawzall" as well, putting it through what would be an "ultimate test" in any case. I was cutting through 9+" root sections then busting them out of the ground with a large spade shovel.....did I tell ya how much my hands still are sore, LOL....

    I mowed all involved areas with a push mower set on a low setting before I would allow the new tractor to see it. Having put a crankshaft through an engine casing last season I wanted to make sure I didn't have a rerun. I feel pretty confident that I got them all, but not without a BUNCH of hard work and persistence in the process.

    It's a really good idea to make sure that a new owner of one of these machines does a thorough survey of their lawn before letting said new machine see the lawn. I anticipated needing to do this from prior issues in stump removal and prior mower damage and made sure the new Deere wasn't a victim to any "leftovers". It's really interesting to me seeing this thread come up, given what I've been doing to my property in recent weeks. Sorry to hear that you have to go through that, but it doers serve as a warning to new owners to make sure that ALL obstacles are dealt with before putting such a machine into service.
    North585, IndianaJim, Levi and 5 others like this.
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