Troy built horse loses power when I engage tines into the dirt. What do I need to service?

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

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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 ...

Troy Bilt Horse Parts Lookup by Model - Jacks Small Engines

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Troy Bilt Horse Exploded View parts lookup by model. Complete exploded views of all the major manufacturers. It is EASY and FREE.
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Garden Tiller and Cultivator Parts ' Troy-Bilt US

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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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Troy Bilt Horse Tiller Parts

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Troy-Bilt Horse Tiller Part Search. Search the part you're looking for by part number or model below. Troy-Bilt Part Number:.

The lever for the tines moves easily? Is there an adjustment on the linkage that may need tightening?

check the shift linkage sometimes the pins fall out when you shift it does it move to freely

http://www.hammerwall.com/Manuals/Troy-Bilt/Description/21A682J766/Troy-Bilt%208%20HP%20Rear%20Tine%20Tiller%208%20HP%20680%20Series%20Briggs%20and%20Stratton%20Engine%20Manual/275092/

Is this a two speed or a 4 speed ... it is a MTD built Troy or a Troy built Troy or do you know?

There were two versions of Horse built in Troy, New York bu Gardenway ... the two speed and the 4 speed. The two speed used two belts the same size while the 4 speed used one belt on different sized pulleys. There was also a variation that used a slip gear ... this model was built to accomodate other accesories ... log splitter and generator.

If yours is a Troy Built from Garden Way, I can help you. If this one is from MTD, I'm not so sure. Can you ID your machine for me please?

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.

Yes there will be a shear pin
It may also have an engagement cable adjustment issue

It's likely that your clutch needs adjustment. To adjust, you just need to loosen the two screws on the plate and slide it a bit so the clutch better engages the rear dog clutch. Have you ever taken the tiller portion off the transmission to grease the clutch? If not, before adjusting it you might want to do that. It could be that the clutch isn't sliding back far enough to engage the rear end and a little grease is all it needs. This service requirement is explained in the owners manual for the tiller. One last point, the tiller must be in neutral when engaging the pto clutch. From your note, it sounded like you were engaging the clutch with the forward/reverse lever in the forward position. The lever must be in neutral when engaging the pto clutch.

The tines are very close to the housing and sometimes you do get rocks hitting,as for the dirt it should have side panels to keep the dirt in place.

The problem is lack of lubrication in the pto coupling. Losen the two swing bolts carefuly,block the front under the motor. Separate the tine transmision from the housing and grease both sides with as much grease as you can work in. Work the lever as you do this. Should fix the problem.