EGO 21" SP Mower rips/digs up grass

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  • Updated 2 years ago
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This conversation has been merged. Please reference the main conversation: Power Plus 21" self propelled mower uneven cutting

I’m encountering a problem with my brand new 21” Ego SP Mower while mowing at the lowest height on Tiff Bermuda Grass.  We like to keep our Bermuda lawn very short, and it does very well at that height.  The problem is the Ego Mower often seems to dig in creating a real mess in spots.  It will dig/rip up a circle of grass in some spots, flash the warning light and die.  Or it will dig/rip up a wide strip of grass in others, and die.  I am only removing about 1⁄2 to 3⁄4 of an inch of grass, as I mow often (every 3 – 4 days).  So it’s not that I’m mowing tall grass.  It’s as if the blade grabs the grass, winds it up and gets bogged down and pulls it out instead of cutting.  The deck is clean, the blade is sharp, the grass is dry.  Shouldn't I be able to mow at the lowest cutting height?
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I Dexter

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Posted 3 years ago

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SCDC, Champion

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hi Dexter,

I too have experienced this if I don't sharpen the blade to a razor like sharpness.  It'll grab my Centipede talons up.  I think it's two things working together.  Slower blade RPM's and a dull blade.  Cut at the lowest setting for my grass (recommended for my grass type in the summer months),  I do get some scalping in a few rare bumpy areas, but otherwise the height is good.  To get my lawn looking the best, I move to position 2 and leave it there. Your lawn will adapt.

Remember that the lowest setting can be a bit risky on a lawn that isn't very level.

are you getting any scalping?  If so, go up a notch and your grass will fill in over a few weeks and look great.  Sort of what I did.

Interesting post.

(Edited)
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Piggy

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this may sound stupid...coz it is...how do I sharpen the blade? 
I only had to change the blade once every 5 years, and that's after hitting a rock. It was easier to just buy a new blade. If it's twice a year, it'd be a bit expensive.
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szwoopp, Champion

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(Edited)
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Piggy

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perfect, thanks
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I Dexter

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Thanks for the reply, SCDC Champion.  I just mowed about an hour ago, right after my hubby sharpened and balanced the blade (he's in the tool sharpening business).  Sure enough, it goobered my lawn in several spots, yet mowed perfectly in others.  If it were bumps that were the problem, I would understand, but it seems to do it in the smoothest parts of the lawn.  It doesn't scalp the lawn in any areas, but it's like it just grabs on and digs in.  So weird, not to mention annoying.  Beautiful, short green bermuda and then these areas that look like I used a tiller on them.  I guess I will have to reluctantly move the height up a notch.  Hate giving up my golf course look; however, right now it looks like a golf course with an invasion of ground hogs!
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SCDC, Champion

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Thanks for the information.  That's a bit odd, honestly a first!  I don't think you will be overly disappointed moving it up a notch.  The increments are pretty darned small, like under an inch.  Please let us know how that works out!
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I Dexter

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I'm mowing again on Friday and will raise a notch.  I saw that the increments are supposed to be 1/2".  Will see how that goes.  Thanks for your input!
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Ed Burckhardt

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I had some of the symptoms you describe once when I did not lock the handle down securely.  I am talking about the ability to collapse or telescope the handle into a shorter handle for storing the mower. 
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David Cline

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I've seen very similar results one time, but mine was due to operator error. I cleaned the deck, sharpened the blade, and reinstalled it—upside down.

Installed upside down, the blade still cuts surprisingly well, and is actually quieter than when installed correctly. You would never know, except the grass clippings aren't mulched and the battery run time is probably half of normal. But I didn't realize my mistake until I started wondering about the terrible battery life after cycling through 3 batteries.

This is the first and probably last time I will mention this very embarrassing mistake, in hopes it might help you or someone else who might be reading this. The blade actually says "THIS SIDE TOWARD GRASS" not "THIS SIDE UP" as I thought I had read.
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SCDC, Champion

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I won't let you live this one down.
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I Dexter

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Ruh roh, David!  Now that would be truly mortifying (she said secretly to herself as she ran out to the garage to be sure that isn't what she did....).  Fortunately or UNfortunately, that is not the case (would almost have been happy had it been, because I could have corrected that and happily mowed into the future on the lowest level). Gonna see what it looks like on the next notch up on Friday.
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Jacob

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I know you said he owns a knife sharpening business, but is the blade super duper razor scary sharp? Challenge him to make it as sharp as he possibly can. The reason I bring this up, is because most people do not sharpen mower blades as sharp as you will need it.
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SCDC, Champion

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What Jacob says. I can literally cut paper after I sharpen my blade
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I Dexter

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Jacob, I know what you mean.  But he's a stickler about those things (that and balancing).  
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Lawrence DIYer

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I just got my mower this morning. I tried it out and it cut fine until I got to the back yard. The front yard has Burmuda and the back has Emerald Zoysia. The Zoysia is very thick in some spots, so thick that it slows the blade down to a crawl. I raised the blade up a notch and it cut fine, but I can use setting 2 in front, but only 3 in the back.

This is a case where horsepower is an issue. It's not that electric motors can't produce that much power because trains run on electric motors (750 v). But an electric mower with enough juice to power through heavy grass would weigh a lot more. More weight, more horsepower, shorter run time. I think this is one of those trade-offs that we will have to accept.

I owned an A/C-powered mower for 3 years. It was only 19" and it was heavy. Even with a shorter blade and a big motor, it wouldn't cut the Zoysia that low. But I learned real fast that a sharp blade is absolutely necessary. I sharpened mine about once a month, or more often if it like it wasn't cutting well.
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Blue Angel, Champion

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Lawrence, did you try sharpening your 21"'mower blade? I think you might be the first person to bog the 21" mower down, that I've seen anyway.

Did you get the SP mower with the 7.5Ah battery?
(Edited)
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Blue Angel, Champion

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I see in another post you said you have the SP version.

You should check out David Cline's 21" mower Torture Test post. If your application doesn't seem as severe as what he put his mower through, yours might have an issue preventing it from performing at its intended capacity:

https://community.egopowerplus.com/eg...
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(a)Typical Engineer

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I've had the same problem in several parts of my lawn, and while blade dullness will contribute, the primary cause (for me) was uneven ground.  As I found these trouble areas, I leveled them, and over time I had the gouging problem less.
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jbsound

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We are having the same issue with a new 21" SP mower. Pulling grass as the motor almost comes to a complete stop. I could be completely off, but it seems that the electronics of the mower are capable of detecting a higher load on the blades and tries to adjust the RPM. However, that kicks in way too late, which results in the pulling of the grass.
Similar to the original poster of the issue, our grass is not tall, just thick in certain areas. Our gas-powered mower had no issues with it at all. Again, I think this has something to do with how the mower handles the power going to the blades.
Will be calling support to see if it can't be resolved. If not, this one will be replaced with a gas-powered mower, as sad as we are to go back to that.
(Edited)

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