V Belt,​​ 5l 70.​​90 954-04249A

I was a bit skeptical concerning this repair as operator's manual for 2010 Troy-Bilt pony lawn tractor suggests replacing drive belt be done by authorized Troy-Bilt repair station. However I watched Ereplacementparts video on YouTube (replacing drive belt on Troy-Bilt pony) and it was such a thorough video (kudos to Mark) that I decided to do repair by myself. I did view video multiple times and did call to speak with salesperson (MaKayla) who was very helpful in determining parts which I needed and actually corrected me on a replacement belt keeper part number. Actual taking deck off and replacing both drive and transmission belts took approximately 3-4 hrs as I tried to be as methodical as possible. Video gave me a great tip for removing tension springs, that is tying a rope and pulling them loose which I might not have figured out on my own! I had to replace bolt which holds main driveshaft pulley on engine which necessitated ordering parts this time online, but the exploded parts diagrams made this very easy and all parts actually arrived in 3-4 days time which I thought exceptional! I tried out mower this morning and it seems to operate as good as new, time will tell, but I must say that your company has been very thorough and on top of things, thanks much for all the help and reasonable pricing! Repair video was just outstanding and company service is excellent.

I watched youtube videos to research the cause. I concluded that the drive belts were worn and stretched. So I called Troybilt to verify my belt numbers. I ordered the belts and received them fairly quick. I watched the eReplacement video on youtube on the procedure to replace the belts. I was able to complete the task though the video made it look easier than it really was. There were some tension issues to overcome with the belt on the differential. Putting the rear pulley back on the shaft was very difficult. Other than that the rest of the repair was as the video showed.

I use a Milwaukee 1/4 hex impact wrench I didn’t have to use a pipe wrench popped it
right off of there I was surprised

1 removed mower deck.
2 replaced missing pulley and check condition of all other pulleys.
3 reinstalled mower deck

There are good videos out there but here is additional info that I learned only by destroying a new belt and reinstalling another three times before getting it right...
1. Install belts only in this order: long drive belt, short drive belt, mower deck belt.
2. Have to put the long drive belt on the crank spindle before putting it on the rear pulley.
3. Before tightening anything, check that the long drive belt is over top of pedal rod.
4. Before tightening anything, check that all belts are inside all keepers.

Chage all belt

Solenoid first . This was difficult due to hidden location
Mower deck had to be removed then guards.Pulley removable was easy .
Actual belts fit correctly , problem with threading the belt to the drive axle.
Biggest problem COLD WEATHER !

Pulled mower deck from tractor. While out replaced mower deck belt and new blades. Removed battery and holders from back of tractor. Removed small drive belt, and then pulled off old main drive belt through body of tractor and removed pulley shaft from motor and replaced the main drive belt. Installed shaft with belt on. Mower drives and cuts great. All speeds now work. Will order parts from here again. Thanks Tom