Disengage wheels from transmission

That's tricky... some of the small TB will not free wheel and either have to be "drug" from place to place or start up and drive it. Some allow to freewheel by pulling the pins on the wheel hubs, pushing the wheels "in" and reinstalling the pin. This allows the hub to "freewheel" on the axle and the pin just keeps the wheel from falling off. Hope this helps.

You can check the linkage that links the governor to the carb. If that is fine then you can check the fuel line for a blockage, the carburetor for debris, and if that is fine then you may want to try sanding the rust off the magnet (on the fly-wheel).

You've got the right serial number - it appears you've got one of the older Tuffy's. I'd suggest keeping an eye on Ebay for the manual you're looking for. I find them out there with some regularity. You can't get them from a dealer anymore because this Tuffy was sold by Troy Bilt before they went bankrupt and MTD bought the assets.

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.

Some Troy Bilt Tillers were designed with a manual "free-wheel". If yours is a Tuffy (and maybe a Junior), you have to pull pins out of the wheels to move the tiller without starting it. The larger tillers, Pony's and Horses, had a lever to shift to release the wheels.

lac spark plug on motor pull cord if no spark take the pull start cover off and sand rust off fly wheel

Shift your Wheel gear lever to "disengage". Use the disengage position only when the engine is not running.

The way to move without the motor running...

1.on each wheel pull pin in center of hub
2.push wheel closer to motor.
3.put pin back in to axle but not though hub
4.do the same steps to other wheel
now you can push tiller

Check the Troybuilt website for specific info on your tiller.
www.troybuilt.com

Your engine number is wrong by only one character. The proper number is H30-35387S you had a 5 instead of the S. You can download the engine manual from Tecumseh. I don't know about The rest of the tiller. (I have the same tiller).