Troy bilt pony left side tine assembly fell off

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

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Garden Tiller Parts - Troy-Bilt

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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 ...

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Find the tiller parts, including blades, belts, tines, seals and replacement part kits, that fit your Troy-Bilt outdoor power equipment.
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The lever for the tines moves easily? Is there an adjustment on the linkage that may need tightening?

Head bolts are probably loose, check the 3 nearest the mouffler and of course check all of them.

That's the engine number. It's a 6Hp Tecumseh. Go on ebay and buy the Troy Bilt parts manuals on CD for Horse Roto Tillers (if that's what it's on). I paid $8. Definitely worth it.

Have you tried soaking the shaft area with either PB Blaster or Deep Creep penetrating oil. Try this for a few days before trying to tackle getting the tine attachment off.

1. Remove belt guard on left side
2. Remove belt, large pulley on gearbox.
3. Remove throttle cable, idler pulley cable and shift handle.
4. Remove engine, handle, wheels, tines cover and tines.
5. Lay gearbox on side on two sawhorses, left side facing up
6. Remove all the nuts on that side. If the three shafts have corrosion, use sandpaper to remove.
7. Pry the two halves apart, then hammer the ends of the three shafts to push through their bushings. Use brass or wood to avoid blossoming the shaft ends. When shafts are through their bushings, the right side will fall away.
   

I presume you opened the port and removed the grade 8 placement bolt? If you have then you need to polish the shafts with 400 then 800 sandpaper, clean then lube them before trying to slide thru the support bearings. If your tine shaft is bent? your screwed, or just remove the shaft seals with a screwdriver and replacing them without removing the shaft. REmember to put a thin coat od RTV arround the outer lip to help make a better seal

You likely have a clutch problem, never saw one that a simple adjustment would fix. I'd take off the tiller (there are two bolts that hold the tiller portion to the transmission, and check to make sure the clutch is sliding in and out. My hunch is either the lever is loose on the shaft or the allen-head little bolt that they use to shift the clutch has come out. Be sure to grease the clutch while you're in there.

This should be covered in your owners manual. Shame on them if they didn't mention this.

on my pony the disc came off when i removed all of my tine shafts. then i pulled the old seals out an drove the new ones in

If the seal fits over the axle shaft it should be ok. be sure your axles are very clean as not to ruin the new seals when applying them. probably a good idea to replace them as a pair (right and left side) to save you time down the road.