I have a Honda Harmony II. Model number HRR216. I bought it last year and used it for a backup mower for maybe 15 hours last year. Just this past July i started using it as a regular mower. Now, i've heard that these wheels become very hard to turn when you're pulling back on the mower. Does anyone know why it does this? When you push it forward its fine. Works like its suppose to. But, when i pull it back, its very hard to pull. I took the wheels off, everything is fine. I can actually spin the little gear backwards and its smooth. But once i put the wheel on its back to the same thing. The bolts aren't tight on the wheels, so thats not it.. I've used WD40, still the same thing. Anyone have any solutions?