My 21 inch Ego mower with the updated self propel unit has developed an annoying quirk. Some of the time when I try to move it, or make a turn at the end of a row, the right wheel “locks”. This isn’t an issue when making right pivoting turns, but when you are trying to pivot around the left wheel and the right wheel locks up, it stops the turn.
It appears to happen both with or without the mower motor engaged. It sort of acts like the “anti-roll-back” feature, except that I’m not trying to make the mower go backwards, and it’s always the right wheel that locks up, never the left.
I had never noticed this behavior before a month ago, so it appears to be a newly developed issue. So far the self propel unit is working fine when engaged, but given my history of self propel unit failures, I’m concerned that this quirk may indicate something in the motor control unit is having issues…
June 2021 Update:
The issue shown in the above video kept getting worse until I called Ego support and described it to them. They immediately sent me to the local Ego certified repair place who fixed the issue in about a week. The issue was that the nylon gears at both ends of the drive shaft (as well as the plastic gears inside the wheels) were worn down and slipping/jamming. The shop tech said that he replaced both the motor/drive unit and both wheels. Here is a photo comparing what the nylon gears are supposed to look like with what the actually looked like.