Troybilt Pony 13AN689G766

Forest#2 said:
Keep a heads up when around that type machine when off the machine with it running.
It's the type that the blades will start turning with the deck lever all the way up. Why As the belt sets in one place on the engine pulley it gets warm/hot and friction increases and the blades start turning. It's a common issue with that type, especially if it does not have any deck brakes and will even do so with deck pulley friction brakes and it only depends on the slack in the belt to not rotate the blades. The length of the belt is very critical for temporary dis-engaugement by just slacking the belt. operate the deck up down with the engine not running, as you raise the deck it should move forward and slack the belt and as you lower the deck it should move back and put tension on the belt. (You are playing with a poor design but they will cut grass good when all is correct. (just don't trust the deck blades remaining in neutral when they should)
As the deck is lowered the deck moves back and tightens the belt. You need to make sure the belt is correct length and then go through ALL the deck adjustments. The front of the deck is too low now.
If you check all the deck adjustments per specs and the belt is correct and it still has issues remove the deck and check the bearings and make sure a spindle leg is not broken or the deck rusted out or bent under a spindles.(that allows a spindle to lean forward under tension)
You can check the length of the belt using a $4 cloth upholstery tape measure. I've seen belts bee off as much as 1inch in length vs what is stamped on a new belt.
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Deck has developed slop and wear over time. Looks like another crappy Troy Bilt design that needs to be just right to work correctly. You should recheck everything visually and with your hands; the tension, pulleys, spindles, alignment of belt, etc.
 
StarTech said:
5/8 x 74.

When you slowly turn the spindle is there any rough spots or are they noisy? If so then one of them could locking under load. I have had belts to break because of this at random times.
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I will check that and yes its a 5/8 x 74 belt
 
CheatKicker said:
Its in its lowest setting in the pictures. Does it look like to much slack?
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Hard to tell in the picture but seems to be about normal.

Some things I've seen on that type deck from experience.
I also noticed in your picture that is the type deck that when you raise it up all the way the top of both spindle pulleys contact blade brakes (item 32 in your parts list) mounted on each side frame as the deck is raised and also the deck should move forward and slack the belt so as to keep the blades from spinning. The flat metal on top of the spindle pulleys is where the brake pads make contact and the pulleys start spinning and wearing out the brake pads. Brake pads are getting hot and the belt slipping in the drive pulleys and the belt gets hot. These 2 blade brakes usually wear out fast because they are wimpy and when they brake the blades they are too wimpy to hold the friction of a new belt in the front pulley for very long with the ENGINE RUNNING.
ALSO
On that type mower, the NEW deck belt WILL START GETTING HOT AND YOU WILL SMELL A RUBBER BURN due to the belt slipping in the motor pulley if you leave the engine running for awhile with the deck all the way up. The motors pulley is spinning and the belt is slack stationery (not spinning) and or slipping in the motor pulley groove . Then when the belt gets warm/hot friction will start over riding the blade brakes and the blades will start spinning.. It's a very poor mechanical design. To reduce the burning of the belt do not run the engine very long when the deck is all the way up and the belt is slack, ESPECIALLY IF THE BLADES ARE NOT TURNING. What I've done IS LIVE WITH THE DESIGN OR is install a 1/2-1 inch longer belt if I want the blades to maybe brake for longer period of time with the engine running.. Also the blade brakes are wimpy. The blade brakes USUALLY will not hold the blades FROM SPINNING with a new belt for very long with the engine running.
What makes all this worse is if the deck adjustment are not correct or things are bent or worn out.

Main thing is you do not want to smell belt burning or see rubbing wearing of the belt when the deck is down in the mowing position.
Here is a link at sears parts direct to download a owners manual and parts list for your machine.

 
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Forest#2 said:
You can check the length of the belt using a $4 cloth upholstery tape measure. I've seen belts be off as much as 1inch in length vs what is stamped on a new belt.
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You can buy a box of 10 belts from the same manufacturer, same size and model number. NONE will be the same size. It's really bad doing AC air handler work with multiple belts showing this size mismatch.
 
slomo said:
You can buy a box of 10 belts from the same manufacturer, same size and model number. NONE will be the same size. It's really bad doing AC air handler work with multiple belts showing this size mismatch.
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V-BELTS now days.

I most generally always measure a new belts length BEFORE I install and compare it to the intended specs NEW for length. I learned to do this the hard way. (school of hard knocks and money and time leaving my pocket and not coming back)
Also I measure the old belt length if it was still operating I can compare the old to the new lengths also. If the new belt is quite a bit shorter or longer I then have a heads up that something is not correct before I waste time installing a new high dollar belt and voiding any implied warranty.

Few years ago I could find matched pairs of belts sold as a set. Trying finding such now days.

I see several belts from a seller on ebay that has exact same part number but the belts they have listed WITH SAME PART NUMBER have different lengths and even widths posted in their advertisement.

When I emailed them a question about such to please explain, they blocked me from buying from them.

I wish I could thank them for doing me that favor. (cannot thank them because of blocked email)
I'll not mention the sellers name, but I've noticed they are acquiring several neg feedbacks due to poor customer relations and selling wrong parts.
 
CheatKicker said:
Ive been trying to get this up and running. It drives well. But the deck belt is burning and getting eaten away by the pulleys. They spin freely and i looked at the diagrams for this exact mower and it doesn't have a tensioner or idler pulley. So im not sure what to do nextView attachment 74516View attachment 74517
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I see only one bolt holding the the belt cover on. You can see the threads for a bolt in the hole that has no bolt. You can also see the markings where I bolt was previously there. If that cover is touching the belt even a little it could ruin the belt. Maybe that belt cover is vibrating when mowing allowing it to touch the belt....or if the belt itself is vibrating it could be bouncing off that cover That would not be good. I also see two other holes toward the back of the cover. What are those for? Are there threads visible?....which would indicate a bolt is to be through those. Those holes are for something !
 
CheatKicker said:
Ive been trying to get this up and running. It drives well. But the deck belt is burning and getting eaten away by the pulleys. They spin freely and i looked at the diagrams for this exact mower and it doesn't have a tensioner or idler pulley. So im not sure what to do nextView attachment 74516View attachment 74517
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I had one of these confounded things given to me a while back. It wasn't long before I understood why it was given to me. The deck is simply slung under the frame with no anti scalp wheels or positive height adjustment. Those two discs on top of the spindles are supposed to contact two "brake shoes" fastened to the frame so when the deck is raised, the contact is supposed to stop the blades. When you drop the deck down, it tensions the belt and starts the blades. One problem: if your yard has any undulations in it, the blades will scalp the high spots and miss the low spots. The lawn looks great except for the dirt exposed on the high spots. It also ate belts. Solution: I took the deck off and put it out for the scrappers, put an air horn on it and used it to visit friends in the neighborhood. Bought another tractor. Good luck!
 
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