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Something going on in either the drive belt or transmission belt area; The mower still drives but there is a hard knocking/thumping and you can feel it when you food is touching the brake pedal. Its a MTD model 13AM675G205. Its called Ranch King it has a 14.5hp Briggs & Stratton and has speeds 1 thru 7 and the tranny is 3 position FWD, N, REV; Like something has broke or came loose? IT DOES IT WHEN THE TRANNY IS IN NEUTRAL BUT THE SPEED IS ON ANY SETTING EXCEPT PARK. SO MAYBE ITS THE VARIABLE SPEED BELT, BRACKET; OR SOMETHING IN THAT ASSEMBLY. I AM AN INTERMEDIATE MECHANIC AND I MY CONFIDENCE LEVEL HAS INCREASED OVER RECENT YEARS; BUT I WOULD LIKE TO SEE IF SOMEONE MIGHT ZERO IN ON THIS WITH THE SYMPTOMS I'VE DESCRIBED; I DON'T THINK A BELT IS BROKE; BUT MAYBE A SPRING OR BRACKET HAS CAME LOOSE OR BUSTED; ITS CREATING A HARD THUMPING/KNOCKING AND IT EVEN JARS THE WHOLE BELT AND PULLEY ASSEMBLY WHEN IT DOES IT.

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It sounds to me like it may be a chunk missing out of your belt. Or warped pulley.

I dont think that it would be a broken spring because it would make the belt slip. Does it do it the same no matter how fast you are going?

But no matter what it is, if you start taking it apart. It should be easy to find. If its not the belts you can jack the rear wheels up take the belts off and work the pulleys and or wheels til you find it.

Posted on May 28, 2010

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