Question for Malky Malky-I previously asked the question in regard to small engines.?

I DID NOT LEAVE OFF THE GUIDE PULLEY TENSION SPRING AT THE BACK AS YOU STATED. MY QUESTION-- I HAD A BEARING FAILURE IN THE GEAR BOX OF MY TORO PERSONAL PACE MOWER. IT TOOK OUT THE RING GEAR AND PINION. I REPLACED THE WHOLE GEAR BOX & AXEL SHAFT. IT CAME IN AN ASSEMBLY. SINCE REPLACING IT, I CANNOT SEEM TO GET THE MOWER TO RUN IN THE GRASS. ON CONCRETE IT GOES FINE, NOT IN THE GRASS. I REPLACED THE BELT. THE SPRING IS ATTACHED TO THE ARM THAT MOVES THE GEAR BOX ,ROTATING THE GEAR BOX ON THE AXEL WHICH TIGHTENS THE BELT. THE SPRING IS FASTENED TO THE CABLE AND IS NOT REMOVABLE. WHEN THE COVER OF THE BEARING WENT THROUGH THE RING AND PINION, IT TOOK THE TEETH OFF OF THEM. THE MOWER WOULD GO BUT THE GEAR BOX GROWLED TERRIBLE. IT STRETCHED THE BELT CIRCUMFERENCE APPROXIMATELY 1/4 INCH MORE THAN A NEW BELT. I WONDER IF IT COULD ALSO HAVE STRETCHED THE SPRING OR CABLE NOT ALLOWING IT TO FULLY ROTATE THE GEAR BOX ON THE AXEL SHAFT.