SELF PROPELLED MOWER DECK RISES

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  • Updated 2 months ago
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I own the 21"self-propelled model, I've had it for 2 weeks and used it twice, I absolutely love this mower. My property has a slight incline on both sides, about 15 - 30 degrees. I notice when cutting my lawn up the hill and the self-propelled was engaged the mower wasn't cutting at the selected height. 
This would leave the downhill not self-propelled line cut low and the uphill self-propelled line cut higher. That's when I noticed every time I engaged the self-propelled motor the rear wheels and axle would cause the mower deck to rise about 1/2 inch. This would only happen when selecting cutting heights 2 and up when self-propelled was engaged. Even on a flat surface with pressure applied to keep the mower down, when self-propelled was engaged the deck would rise. I was told by an Ego Rep to return the mower, which I will. Has anyone else encountered this issue? and if so was it resolved when you returned it for a replacement?
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AUDY AVIN

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Posted 2 months ago

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Jackie Hardie

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We have had issues with out 21 self-propelled leaving strips of cut grass and strips of uncut grass. They replaced it this year and although it is a very slight bit better, it's still a huge issue.  My husband says he can't see one modification.  I'm betting your issue is much the same as our experience.  Yes, we love the concept of the mower, the easy start, quiet...it's just not perfected yet which if your meticulous as we are, it's quite annoying. 
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AUDY AVIN

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This isn't my mower but mine is doing the same thing. 
https://youtu.be/M5d60dk7-84
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szwoopp, Champion

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Have you tried applying upward pressure on the handle to keep the front end down and thus get a more even cut.
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AUDY AVIN

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Hi Champion, the front end doesn't come up. The rear of the mower rises when the self-propelled is engaged causing the entire deck to rise. 
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AUDY AVIN

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This isn't my mower but mine is doing the same thing. 
https://youtu.be/M5d60dk7-84
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szwoopp, Champion

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I understand what you are saying. However.....

The SP drive is in the back wheels, this can cause the front end to tilt up. 
As the video points out a full grass bag makes it worse.
A full grass bag will not lift the mower deck, but it will tilt the front end up.
Mowing up hill can cause the front end to tilt up and this would not occur when mowing down hill.

So, again I ask, have you tried applying upward pressure on the handle to keep the front end down and thus get a more even cut ?
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AUDY AVIN

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Hi Champion, trust me I know about mowers. I owned a lawn care business for 10 years and had all high-end commercial equipment, Stihl, Toro, Exmark, etc.
Whether the bag is full or empty, going uphill or downhill the front doesn't tilt up. The rear drive when engaged causes the entire deck to rise almost a 1/2 inch. I only noticed it going uphill because that's when I would engage the SP. I engaged the SP going downhill and I get the same results. I guess you have to see it for yourself. 
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szwoopp, Champion

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I am not arguing or disagreeing with your observation.  This does not mean there is no work around or process to minimize the problem.  I am not saying your problem does not exist. So, you can thoughtfully consider ideas and maybe try them or you can just keep saying no.

You posted the video which specifically states the problem is worse when the bag is full.  How do you explain this.  Does the mower deck lift up higher when the grass bag is full ?  Or is it possible that the front end lifts up IN ADDITION to the mower deck lifting.

Here is another idea - Have you tried mowing across the incline or at a 45 angle rather than straight up and down ?
(Edited)
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summetj

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I believe all Ego SP mowers have this behavior. I just use the SP in both directions to get a consistent cut height.
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AUDY AVIN

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I understand, but in order to extend my battery life, I only use the SP going up hills.
This isn't my mower but mine is doing the same thing. 
https://youtu.be/M5d60dk7-84

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summetj

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The amount of power the SP draws is based upon how much work it does, so as long as your speed control isn't set so high that the SP "pushes" the mower down the hill faster than it would usually roll, you won't be using up TOO much extra power on the downhill run.
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Jack Tracy

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I've been commenting about this for a while. On inclines mows shorter in one direction then higher in the other direction. Unfortunately, the first 90 days of ownership I was cutting newly laid sod and didn't have a problem until the next season when the grass thickened up. Bought a high lift blade to see if it would help. It did not. See my HD review of high lift blade with picture. Ego responded and said mow sideways.  But it doesn't matter  up or down or sideways. I'm taking it in at the end of the season when I stop mowing because it takes at least 6 weeks to get it back. 
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Jackie Hardie

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I'm right there with you.  Mo mater which way you mow you're going to get the same poor results.  It's quite a flaw in this mower.
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AUDY AVIN

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Hi Jack, I returned my mower of 2 weeks and exchanged it for a new one and it's doing the same thing. When ever you engage the self propelled any height above 2 inches the deck rises about 1/4 - 1/2 inch. It's not the front lifting it's from the rear which inturns raises the entire deck creating and uneven cut. I paid extra for self propelled and need it for the inclines in my yard. This needs the be fixed. Another owner made a video and posted it on YouTube, https://youtu.be/M5d60dk7-84
This is the only issue I have with it, otherwise it's a great mower.
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szwoopp, Champion

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"Do not mow up and down inclines"



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Jack Tracy

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First, you have to vary your pattern once in a while or you mow a permanent pattern in your yard.
Second, even going sideways on the up and down incline there is also another slight incline in my yard  which causes the mower to mow shorter going down the incline and higher going up the incline. Does alright on even ground only. 
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Larry S

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I never really noticed it with my 7.5 21SP, but in an effort to get better quality cut I switched to the dual battery 21SP and it is very noticeable with this model. You can see it clearly sitting on level thick concrete and kicking in the SP. Now keep in mind that it does not seem to stay at that higher level, so it just when it starts and then is settles back down. It's almost like its a mechanism to help control the power draw at startup. The whole mower deck lifts as if you were adjusting the height.  
I have learned to start pushing before engaging the SP and this seems to eliminate the problem. Of course I also see the opposite problem when coming off SP. I continue pushing before disengaging the SP because if I don't the deck will lower (feels like it nose dives). This is really apparent when mowing my Bermuda at 2" or more.
So again, it really looks like it has been designed to do that for some reason (power savings or motor life). It would be nice if someone from Ego would discuss the engineering concept behind it.
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AUDY AVIN

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Finally, someone who understands what I'm going through. 
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Bill Menzel

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I have the same lawn mower and cut my Kentucky blue grass sod at 31/2 inches and don't have the same problem you have.  I use two 7.5 ah batteries, but I don't think that has anything to do with your problem.  Now in the fall, I cut my grass at 3 inches and still don't have that problem.  I would call Ego and find out what could be causing that.  Good luck!