I am currently looking at buying a troybilt horse with serial # 340455. Can someone let me know what year this is?

without a proper model number it is guess work, but either the drive belt has snapped, or if the right wheel drive the left wheel, there may be a half moon key way or a shear pin. General help here, followed by parts suppliers

https://www.google.com/search?q=Troy+bilt+horse+tiller+right+wheel+turns%252C+but+left+wheel+doesn't+turn

Garden Tiller Parts - Troy-Bilt

https://www.troybilt.ca > shop-by-machine-type > garde...
Find the tiller parts, including blades, belts, tines, seals and replacement part kits, that fit your Troy-Bilt outdoor power equipment. When you need garden ...

Troy Bilt Horse Parts Lookup by Model - Jacks Small Engines

https://www.jackssmallengines.com > ... > Tillers
Troy Bilt Horse Exploded View parts lookup by model. Complete exploded views of all the major manufacturers. It is EASY and FREE.
‎Horse i 7hp roto tiller (s/n 1001... · ‎8HP Electric PTO Horse Tiller · ‎2308 Horse III

Garden Tiller and Cultivator Parts ' Troy-Bilt US

https://www.troybilt.com > en_US > garden-tiller-parts
Find the tiller parts, including blades, belts, tines, seals and replacement part kits, that fit your Troy-Bilt outdoor power equipment.
Rating: 4.8 · ‎88 reviews

Troy Bilt Horse Tiller Parts

https://tb.shankslawn.com > troy-bilt-horse-tiller-parts
Troy-Bilt Horse Tiller Part Search. Search the part you're looking for by part number or model below. Troy-Bilt Part Number:.

Need the full serial number off engine

You will need to contact Troybilt for this.

There is a floater in the carburetor which operates a needle gate to stop the overflow; take it apart and check if the needle is stuck or for some dirt.

There is no data included in the serial number that gives info of what year the engine was made. You can, however look up the number here, and that will tell you the year of manufactor.

http://www.iboats.com/basics/serial_number_year.html#mercury

Hi there's this website something like reliable-store and it is very amazing for manual for repairing servicing anything
someone on fixya recommended it to me and I thank him even today

They have full free manuals
and it's verrrrry cheap and mine I got free in offers 3rd time I also had an issue with the file so the girl replaced it in 30 mins
there is one more but i don't remember its name it was 2 years back bitman something link this
Try it out brother

See if this site has the manual you are looking for.
http://lawnandgarden.manualsonline.com/manuals/mfg/troybilt/troybilt_tiller_product_list.html

Hope this helps!
Codebynite

http://www.mtdparts.com/webapp/wcs/stores/servlet/OperatorManualView?storeId=10101&catalogId=19502&langId=-1

Go to the above website and put in your model and serial number. If it is a Horse tiller just type in Horse and your serial number and you can download a copy of your operator manual. If it is the Horse model it was built between 1/1/80 and 7/1/80. i believe you have a Horse II four speed model that will just have one drive belt the older Horse I tillers were two speed with two belts.
Most any good tire shop can supply tires for your tiller or you can order them online and take then to a shop to mount for you. If your tires are not real bad they can just put tubes in them so they will hold air. Almost all parts are available through MTD who owns the Troy Bilt name now or through many sites online.

Good Luck,

Frank

Ebay has manuals that they say are for all troy bilt tillers on cd for $6.99 free shipping.

Your question doesn't give enough detail to properly answer. Do you know if the tiller is a Horse model or a Pony model? Troy Bilt made both models back in the timeframe you noted. The Horse model had tires that required air to inflate. The Pony model likely had hard rubber tires in that era. The Horse models had a reverse disc, no belt. The Pony had a belt.

Once you know which model you have - look for your closest Troy Bilt dealer and see if they can track down the part for you. They might appreciate it if you could provide the serial number - which is located on the pipe connecting the tiller transmission front half to the back half, where the tines are located. It's stamped right into the metal tube on both models.