Unable to remove nut on lawn mower blade

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I purchased the Ego 21" lawn mower 3 months ago. I am trying to take off the blade to sharpen it but am unable to loosen the nut. I am using a 14mm socket as recommended but it is not budging. I have also tried putting oil/lubrication to no avail. Any recommendations?
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Posted 7 months ago

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Oregon Mike, Champion

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The bolt (not a nut) is torqued to around 40 ft lbs so you need a lot of oomph to loosen the bolt. Torque wrench is ideal but a standard wrench with a long pipe of other way to add leverage can get the job done. Make sure you are securing the blade from moving by putting a screwdriver or other ridgid thing into the opening in the bottom of the mower intended for that.
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szwoopp, Champion

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Avoid the oil and get a bigger wrench - you just need leverage working in your favor (and in a counter clockwise direction).  A nice pair of leather gloves works much better than a screw driver to hold the blade steady for me.

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Paul Christenson

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You may need to use BOTH stabilizers when trying to loosen the blade

NOTICE: If the bolt rotates with the motor shaft when loosening the bolt, turn the fan by hand to align the through holes in the fan with the holes in the blade, and place another metal rod (e.g., a 3.5” length screw bit) with diameter less than 1/4 inch (6.35mm) into the aligned holes to act as another stabilizer (Fig. 23). (in your owner's manual)

5. Continue using the 9/16 inch (14mm) wrench to turn the blade bolt counterclockwise to loosen it completely.

Final Note: Just make sure you are turning the bolt COUNTERclockwise

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Thank you for the input. I am going to try a longer handled wrench to see if I can apply more force. 
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Rick F

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I put a screw driver in a hole near the blade to keep blade from fighting you.  Maybe this video will help: https://www.youtube.com/watch?v=WsZ272F001M

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Michael Willson

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newer models do not have holes to stabilize blade
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Oregon Mike, Champion

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Michael, which models don't? I see the new double battery mower does. At least it's shown in the manual. 
My older 21" does and I can't imagine EGO changing that feature on newer 21" models. 
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Jim Hippen

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I have had success with an impact driver.
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Umm, Probably Not approved operating procedure but it took us a couple whacks with a mallet on our wrench to break the friction holding the bolt. Don't know if his reasoning was correct, but learned that years ago from a mechanic who explained it takes a brief sharp force to undo bolts that had been powerdriven on. This was in explaining why, as a scrawny teen, I couldn't get the tire iron to work on my flat. I was trying to "turn" it. He of course was burly enough to just give it a firm, quick jerk, but he showed me how I, with one whack of the mallet, could take the wheelnuts off like gravy. Having never obtained anything resembling brawnitude, it has been a successful go to move ever since. :)
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Second the impact driver.  Makes quick work of the bolt, on and off.  Since its impact and not a drill, safety profile is much better because it won't spin the lawn mower blade, maybe a little on the initial impact.  Still, for safety sake, stick a wood in there.
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I agree with prairiedog. Stand up and use a brief sharp forceful shove. I also blocked the blade with a block of wood held against the installed blade. At first I thought i had stripped the bolt but I had just loosened it.