It could be the belt itself or the idler cam not returning into the park position.

Thanks for your response....does the idler cam have a spring that might have come off or not been installed or installed correctly? and do you mean that the belt is too tight or not tight enough?

Yes, the idler cam does have a spring that returns it forward- provided that the cam isn't binding at the pivot or where the rollers on the brakes contact the cam. If you see divots on the cam from the rollers - replace the cam and possibly the arms. I assume that there is too much tension on the belt from the cam position or a too short belt.

I suspect it's the non OEM belts are not exactly the same dimensions of the OEM belts. I've bought non OEM belts in the past that indicated the length was the same but they were too short and burnt up quickly. the width also comes into play. Lesson learned, I only buy OEM belts now, saving a few dollars proved more expensive in the end.

thanks for your wisdom..I will replace the new with the old....which there was nothing wrong with

When you install the old belts and the mower now works properly, logic would dictate the fault lies in the new Non OEM belts.

Sometimes when doing preventive maintenance more harm is done than if left alone. Been there and done that too many times.

I follow the old adage "if it ain't broke don't fix it".