Craftsman tractor won't move

Model 917.273080 with snowblower attached. I had the drive belt shred on me. After I put the new one on, I now cant get it to move. 99% sure that I have the belt routed correctly. I lifted up the rear end of the tractor and was able to see that the wheels rotate (one forward and one backward), therefore I am fairly confident the differential gears are OK. When I had the wheels raised, I did have the brake on and the wheels still rotated in the different directions. Is that normal? The wheels have never been removed, so the hex key's should be in place. What other things can be wrong?
Also, when on the floor, with brake engaged, I cannot roll the tractor. Release the brake and it will roll, if I have the "freewheel control" in the freewheel position. If I have "freewheel control" in the drive mode, I cannot roll the tractor. This to me is normal behavior.
Any ideas on what I can check next? Any and all suggestions will be greatly appreciated.

 

All the descriptions you gave sound like normal operation, so I would be back to the belt. Does it turn the transmission pulley when the engine is running?

 

Are you positive you have the belt routed correctly between the idlers and is twisted as required?

 

It does turn the transmission pulley. With the engine off, and the brake off, I try tugging on the belt and it is practically impossible to move, so I don't think it is slipping or too loose.

 

I have checked the routing of the belt at least 3 times and I had my stepson look at it also. He also thinks that I have it routed correctly.
Couple of other things to note, when I put the tractor in gear (either forward or backward), it acts like the "freewheel control" is engaged.
Also, when I take my foot off of the brake, the load on the engine changes because it is engaging the belt.

 

Forget about "thinking" that the routing is correct. It does not go around the idlers like in an automobile.

Pull out the manual and follow the illustration exactly. The belt "twists" is some locations.

If the pump is spinning backwards, you won't move and the transmission will still feel "locked."

Here's a link to the manual. The belt installation is on page 27.

Manual Craftsman Tractor 917273080 | SearsPartsDirect

 

Been down that road when the 'disengage lever' is not returning to engaged position. Wiggle it around and it just might engage and get the tractor back in motion.

RR

 

It could be that the freewheel lever has not returned and needs to be moved back. Not the part you pull on in the back, but the part on the transmission that this piece is actually connected to via a spring.