Ferris mower trouble

The model number is dds48ka and the serial number is 451my there is a big parking brake lever and it is off so that's the only brake I know of.
 
I finally got it all back together the belt tensioner spring was off so I have the tranny belts tight and everything. I started it up and let it run and when I pushed the forward level to full speed the tires moved very slow and I did have the mower up off the floor on a jack and the tires just barely moved any ideas? Thank you
 
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