You do not need to tension the mower belt because when you lift the yellow lever the belt is automatically tensioned. I had the same question about 3 days ago and when I turned the handle it got tighter.
To ADD...the deck belt drive tension can be adjusted...where the cable comes to the deck from the drive 'ON' handle...it is in a bracket, take cotter pin out and on the inner part there will be a small black plastic piece attached to that side of the cable...pull cable gently out and up of the bracket...the bracket will have two 10mm bolts...loosen them (no need to remove) and you can adjust the tension...
SO put the cable in and test by hand how tight the belt is...adjust the bracket to the position that works best for your mower...make sure you tighten the bracket down good then in reverse put the cable back in its place in the bracket...hope this helps and not confuse...also here is a YouTube link...is for a l110 but works the same way!
good luck!! http://www.youtube.com/watch?v=K5T-IDIZYuE
How do you change a mower deck belt on a John Deere L130?Read more: How_do_you_change_a_mower_deck_belt_on_a_John_Deere_L130
Its all spring loaded. No adjustments needed.
The John Deere 48 mower deck belt pattern diagram can be obtained from most John Deere dealerships. Many times when you purchase the belt the parts store will give you a belt pattern diagram.
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The John Deere LA130 is a model of riding lawnmower produced by the John Deere Company. The mower uses a 48 inch mower belt. Replacement mower belts are available online and at specific retailers.
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A John Deere belt diagram can be found in an owner manual. The manual should have all the diagrams, and other information for the tractor.
You can change a John Deere LA 175 mower deck belt configuration by checking the diagrams and instructions in the owner's or manufacturer's manual basically.