John Deere LT133 Gear issues - need help !

[jessedude13]

Hi all, looking for some help here. I recently bought a John Deere LT133. First and second run went great !
At the end of my third run I noticed it started moving a little slower. Basically in first gear the machine runs normally, but anytime I will switch into any other gear up from 1st it slows down, dies out and stays put.
Not sure what the issue is or how to look into this.
Thanks for your help

 

[bertsmobile1]

Classic slipping transmission belt symptoms.

 

[jessedude13]

Classic slipping transmission belt symptoms.

Thanks ! Would i need a new belt? or just get it somehow adjusted?

 

[tom3]

Try pulling back on the brake/clutch pedal. Not sure how this mower is set up but usually that will add some belt tension. If that helps it you need a new belt or other parts.