Mower is a No-Go E-Go! Yarr! (Question Edition)

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Mower Blade fell off whilst mowing, all clear thank goodness, now, however, the mower won't start. What's wrong with my baby?! The mower offers up no signs of life what-so-ever ... no decklights, no LED's. It behaves as if there is no battery (yes batts are fullly charged and properly  installed, yes handle is properly extended, and locked). The motor shut-down occurred immediately as the mower blade hit the turf. Thoughts? Solutions?

Is there a safety shut off relay?
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jared Richmond

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  • I'm feeling like a LawnBoss with a broken EGO :(

Posted 1 year ago

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(a)Typical Engineer

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Which model (20 or 21)?
How old?
Can you provide details of how the blade fell off?
Did the bolt loosen and come completely off?
Was the blade removed for sharpening?

Will the battery removed (for safety), can you spin the blade in both directions?  Is it smooth, or is there any dragging?

Do you have a picture?
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jared Richmond

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1. 21 inch,
2. Bolt, blade, and fan all came off leaving only the drive shaft (still have all my toes),
3. Yes, the blade was removed for sharpening,
4. (Battery removed for safety), the blade spins smoothly in both directions. no real perceivable drag. 

I've no problem in producing photos, but strangely, the machine isnt responding to the battery, not at all. It seemed obvious at the time that the mower was constructed with a clever motor shut off function as a safety mechanism, however, the durned thing appears to be in an electronic coma now. You have a hypothesis? As a former lawn kid, i've been loving this mower and have bragged on it plenty, so this is a mega disappointment. 
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Michael G

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@jared Richmond - did you happen to run it without the blade on? Maybe some kind of overspeed protection?
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Jacob, Champion

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That's why I think the source of the problem was the motor stopping, the byproduct was the blade spinning off due to insane torque loads at a immediate stop.
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jared Richmond

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Michael G. Good question, and the answer be a 1. The moment I noticed the blade chatter out in front of the unit the motor had already shut down at which point I had also naturally released the motor lever. I did attempt to activate the motor without the blade at that point without result. I also attempted to activate the motor with all the hardware reinstalled but sans blade, which also had no result. Its all a bit of a ho-hum situation. At this point after spending several days attempting to shake out the issue, especially after having received a great amount of well informed ideas on how to troubleshoot the power issue, im hoping to high heaven I can get a warranty replacement. The mower has been my favorite tool, and I believe its too damn young and gently used (Small Lawn) to be this buggy. Thoughts on that prospect are most welcome.
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Jacob, Champion

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How long have you had it?. If less than 90 days or if you bought it with a hd card 1 year. If so go exchange it at hd
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Amber F., Official EGO Rep

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Jared, please call us (1-855-346-5656). We can help troubleshoot and find a solution. 
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Oregon Mike, Champion

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Seeing that you put the washer on the wrong side, there was nothing to prevent the blade from moving fractionally against the bolt each time the motor sped up or slowed down, or stopped/started, and that is what started the loosening and eventual unscrewing of the bolt. The washer is a keyed lockwasher. The blade can move fractionally but not apply any of that movement friction to the bolt because the washer is the go-between with the key. (Perhaps a keyed blade would be a good improvement too)
My thought is the blade started moving fractionally (probably normal since the hole in the blade is round) which caused loosening of the bolt causing an imbalance at the motor shaft. The imbalance got bad enough that the rotor of the motor got jammed into the stator. Knowing what I know about motors, that gap is probably pretty thin so it wouldn't take much movement to cause a jam. I haven't taken an Ego motor apart, so the previous comment is just my general knowledge of electric motors.
An additional thought is that the blade in the video looked like it had been sharpened. The "grass side" on one end looked shiny like it had been sharpened but the other end didn't. Could have just been the lighting in the video? Did you verify balance of the blade after sharpening and before reinstallation?
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Blue Angel, Champion

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The un-keyed blade is an evolution of the original keyed blade design. The new design allows the motor to slip should the blade strike a solid object, reducing the chance of motor damage.
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Oregon Mike, Champion

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Thanks for that Blue Angel. Explains the reason for the round hole in the blade. I think this really comes down to the washer being on the wrong side allowing the blade to unscrew the bolt.
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jared Richmond

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I think the breakdown of the mechanics is pretty damned interesting. Truth be told however ... the sequence of the hardware reassembly as it's depicted on that demo video (which I hope you all enjoyed), isn't necessarily representative of how the fan, blade, washer, and nut were sequenced when the terminal event took place. 

I can post a photo, but the washer is shadowed on the grass side of the blade. I rely on the manual for instruction, and am confident I had it correct when operating the mower on the fateful day of wonderment. Making that film sequence I was fumbling a bit wanting to put the thing together quickly, and accidentally put one before the other.  

one thing yall brought up that i'm still trying to visualize is this: if the direction of blade rotation moves in concert with the threading on the Bolt in order to keep the bolt taught during operation ... how does the blade having frictional surface contact negatively affect that same design and effect? You get my meaning on that fellers? Blue Angel, Champ, Mike, Type A Engineer, you all are great folks, I really do appreciate your time, knowledge and curiosity. NASA is hiring, you know?
(Edited)
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Blue Angel, Champion

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Funny thing is, failure analysis is actually part of my job, it's just hard to do remotely over the web! :-)

This one has me stumped so far...

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