Well, i bought my belts at a local store that has or will order new matching belts for tillers, or anything else. They sell lots of parts, and will order anything i need! Check in your area--there must be someplace where you can buy parts, belts, etc. But not Home Depot, Lowes, or any place like that! And, automotive belts will not last as long as the kind used in mowers and tillers.
As for replacing the double belts, its a bit tricky, but not that tricky! Here's how to do it: Move the clutch handle to loosen tension on the belts.
Then, first thing, take forward belt off lower front pulley, and rear belt off rear upper and lower pulleys, and slip it out. Then remove front belt.
To install the new belts: Hang front belt over the front upper pulley, but not the lower one. Slip the rear belt in under the front and into the rear lower pulley, then install it in the top rear pulley. Then slip the front belt over the lower front pulley, and its done. you may have to adjust the sliding block, but that isn't too hard to do. It might not let the handle stay in position if its out of adjustment. HTH: Rusty Jones

coop you may have 4 speed horse if do it only has 1 belt look at pulleyes close they maybe different size. The single Belt is special Troy Bilt number 9245 1/2x22 1/4 if pulleys same size just any type 1/2x22 inches long.

Rusty and gator...thanks for your responses...I'm still having a problem getting a manual. Called an 800 off of the Troybilt site which referred me to MTD. My problem is providing them with a serial number. Do you happen to know where it would be located? All the different castings have numbers on them, so it's pretty confusing.

There flat place on transmission housing right side from rear on top side of top cover thats the serial number its stamp in number on smooth surface. But can use Horse for model number and number 1 for serial number on MTD site MTD is owner of troy bilt tillers now.

I cannot figure how to get the belt offmy TB Horse tiller it is a 4 speed with only 1 belt. Anyone know how the belt comes off? Thanks is advance.

Tracto suppy has belt u need...all of theirs is the heavy duty needed for outdoor equipment. The other guy asking about dieing after 10 minutes....it s most likely a fuel problem...carb or fuel filter...ck for spark when it won’t run...if u have spark it’s fuel related. If no spark it’s electrical...possibmy coil... it may work til it gets hot and then stop until it cools off