Troy Bilt 6605 Super Bronco 42" deck drive belt very loose, smokes on drive pulley, won't engage blades. Installed new OEM belt, no change. No issues with belt routing. Known issues?

I DON'T HAVE IT ON HAND, BUT YOU CAN TYPE IN ON GOOGLE SEARCH "YOUR MODEL # DECK BELT DIAGRAM" TO FIND IT, BUT TO DO IT YOURSELF, JUST REMEMBER THAT BLADES MUST TURN COUNTERCLOCKWISE AND THAT GROOVED PULLEYS MUST FACE THE INSIDE OF BELT AND FLAT PULLEYS THE OUTSIDE OF FACE OF BELT, ALSO REMEMBER THAT SOME MODELS HAVE JUST ONE BELT (DRIVE AND DECK BELT) OR TWO BELTS (DRIVE BELT AND DECK BELT)

If you need further help, reach me via phone at https://www.6ya.com/expert/gerardo_79638d1eac6a0a1f

transmission is lock up gears worn out probably do to lack of oil you can get rebuilt but it cost a lot

There is something in a wad! You cranked it up to warm up. You drove it to the crime scene. You first engaged the blade which was OK?
Then released clutch to drive which, smokes the belt.
Most interesting and perhaps you tried to cut some super thick grass at high driving speed with a low/dull blade and the belt just can't tolerate that combination.

I would check to make sure that that the belt isn't pinched somewhere around the pulleys. See if they are movable with mower disengaged and off. If they are hard to move, they most likely have pressure keeping them from moving.
They would create a burning smell even though they are not moving. The main pulley while engaged does rotate and if the belt is touching but not moving, it will rub enough to make the odor.

sounds like you missed a pulley or belt guide and the belt fell off

There is a spring attached to a tensioner that probably came unhooked while changing the belt. Higher deck settings push the deck backwards enough to spin the blades, the lower setting need the spring tensioner to take up the slack in the belt.

One or more of your drive belts is in need of adjustment or replacement, maybe. Possibly, your electric (or manual) PTO clutch could also be adjusted. You do have the spring tensioner on the deck engaged, right? You say the engine doesn't bog when this happens so I am inclined to think "clutch" and/or "PTO belt" to the deck and/or the "deck tensioner" are the things to check.

The tensioner will be the easiest, it is a handle on the left side ON the deck. Has a BIG spring on it. Make sure it is engaged.

Is yours a Troy Bilt manufactured in Troy New York or is it another manufacturer (MTD?). Troy Bilt is actually out of business, having sold the Troy name to a variety of makers depending on the model line. I don't have the run down on who makes what any more (tillers, chippers, mowers, blowers, trimmers, etc.), but Troy Bilt of Troy, NY is no more. :-(

I have a 16 HP Troy with 42 inch deck driven through a electric clutch. I also have a "grass pump" on my deck. Important maintenance tips: Keep the bearings greased, keep the deck clean underneath. The belt on the deck should have the tensioner released when you are NOT mowing. Keep the blades sharp and in good repair. Mow with engine at full speed. When you get to areas of heavy growth, slow the tractor down (hydro drive) or reduce to a lower gear (gear drive). NEVER adjust speed using the "clutch" (hydro drive or gear drive). When you engage the blades (electric or manual) always have the engine just above idle, bring the engine speed up slowly to preserve the belts and reduce stress on all components.

I am sure this is the fix for your trouble. If there is anything else or if I missed the ball, please let me know and we will go further.

Thanks for your question @ FixYa.com

well i would take a long look at the spring which holds the tension pulley in place. if it is weak, or not connected correctly, there will be inadequate tension and the belt can come off. I would also take a look at whatever fasteners keep the deck in place as if it is not kept to the rear, there again will be too much play in the deck belt.

sounds like spring tension on top of deck is connected to a bolt post,mine broke and went missing with the spring,blades kept slipping,didnt know how to tighten belt,go figure