Ego 21″³ mower (LM2100SP) 3rd self propel motor failure & repair report

My Ego 21″²”² self propelled electric lawnmower started on its third self propel unit failure back in June of 2019.   For those keeping track, I bought the Ego 21″²”² mower back in April 2017, and it’s self propel unit failed in October of 2017 I took it to Home Depot to be repaired (which took 6 weeks) and the repaired self propel unit lasted until July of 2018. Ego customer support was nice enough to send out a replacement mower that time, so my downtime was only 10-15 days, and I was hopeful that the replacement mower might have a better self propel unit in it. Unfortunately, that one started to fail in June of 2019, so it looks like the lifespan of my self propel units are 4 months, 10 months and 11-16 months.

So, back in June 2019, the self propel unit just stopped working much like it had previously. I called Ego customer support and they offered to ship me a replacement mower. We had that all set up, but the next day I went out to push-mow the rest of my lawn, and lo-and-behold, the self propel unit had “reset” and was working again! So I called Ego back and canceled the replacement.     Unfortunately, although the self propel unit had not totally failed, it had not fully recovered, and still had some issues that got gradually worse over time. Specifically, the top speed was reduced, and over the next several months, the power and top speed appeared to keep dropping. Eventually it got to a point where it would not propel the mower up a slight hill without me assisting. Eventually, in January of 2020, the self propel unit failed completely, and did not “reset” itself.

Ego shipped me a replacement mower and I shipped the bad mower (my 2nd) to them, so I am now on my 3rd Ego mower (and year 3 of my 5 year warranty). However, for the first time in 3 self-propel failures the SP unit is different! The new mower (manufacture date October 2019) has a different style of self propel unit when compared to the three units that had failed on it in the past. The old unit had a gearbox on the drive shaft and the motor body stuck upwards at a 90 degree angle. The new unit has the motor body above but parallel (horizontal) to the drive shaft. I don’t know if the old unit had a fan, but the new unit has a fan clearly visible.

Older Self Propel Unit

 

New Self Propel Unit

Objectively, the new self propel drive unit doesn’t look as impressive as the older unit, but given the number of failures I have had with the old style, I’m excited to have something change (and hopefully improve). From a performance standpoint, the new self propel unit works just as well as the old style, so there is no loss in performance. I just hope that it will have more longevity than the older units.

I suspect that the size of my yard (which is large enough that it takes me two 7.5 AH batteries to mow it in the fall/winter, and up to four 7.5 AH battery charges in the heat of summer) may be the reason the self propel unit’s are failing. I suspect I’m putting a lot more “miles” on the SP unit than most Ego owners, plus they seem to be failing in the heat of the summer. I’m not sure if that is due to heat related problems, or if it’s due to the grass growing more in the summer.

9 thoughts on “Ego 21″³ mower (LM2100SP) 3rd self propel motor failure & repair report

  1. Pingback: Ego 21"³ mower (LM2100SP) 2nd self propel motor failure & repair report | Jay's Technical Talk

  2. My self-propeller finally kicked the bucket after 4+ years. Do you know if I can just order the replacement part and do the install myself?

    • Your mower comes with a 5 year warranty, so as long as you registered your purchase (or have the paperwork/receipts to prove you are the original purchaser) it will still be covered by warranty. I suggest you call customer support early in the morning on the next business day.

      I have not heard of Ego selling parts to individuals, so if it’s out of warranty or you are not the original purchaser you may need to take it to an authorized Ego repair shop.

  3. Pingback: Right Wheel Locking on Ego 21″ Self Propel unit | Jay's Technical Talk

    • That may not be the SP motor. Another common failure is the wiring harness, which flexes each time the handle is extended and closed. When one wire inside the flex tube fails, the mower typically will continue to provide power, but only at the lowest or highest speed. (Mine was stuck on high. Wheeee!)

      This failure also is covered under the 5-year warranty, but the authorized service provider who performed mine did a so-so job: When I went to pick up the mower (after being told it was ready), it was still in high-only mode. Three hours later, the problem was resolved — but the flex tube looks hinky, and I’m not convinced the repair will last out the warranty.

  4. I seldom use the self-drive because the mower is so light and it conserves battery. However, when I do a 180 degree turn, the real wheels lock up and I have to use the self-drive (or pull the mower back) to unlock the wheels. I contacted EGO and they sent me a new mower, but it does the same thing. I guess it’s a flaw in the engaging mechanism, but I don’t know if there is any fix. Suggestions?

    • I know it has a “anti-rollback” feature that won’t let the wheels go backwards (rolling backwards down a hill and over your foot). I’ve found that when doing a 180 turn, I have to make sure the inside wheel does not move at all, and ONLY the outside wheel moves forward in a big half circle, otherwise the wheels will lock.

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