Lawn Boy 10686 self-propelled bogging down

[train42]

I posted this in the Lawn Boy forum, but I probably should have posted this here...

Lately my Lawn Boy 10686 with sens-a-speed has been acting up. When the drive wheels (rear) are engaged, the engine bogs down severely. If I push the handle up slightly so that the rear wheels are lightly touching the ground it runs fine. I don't have any issues pushing the lawn mower when the engine isn't running and pulling the lawn mower backwards also isn't a problem. Any ideas as to what the issue could be?

 

[twinfords]

sounds like the trans is going out, gear may be worn and binding, when you lift the rear wheels up it reliefs the pressure on the gear.