Tiller moves but tines will not turn - Poulan Pro PRRT850 17 Tine Tiller

Here are some possible causes and solutions:

Belt Issues: If the drive belt is broken or loose, the tines won't turn. Check the belt tension and replace the belt if necessary .
Idler Assembly: If the idler assembly is not properly tensioning the drive belt, the tines won't turn. Adjust the idler assembly or replace it if necessary .
Engagement Cable: If the engagement cable is loose or not tensioned properly, it may need to be tightened or replaced altogether .
Transmission Issues: If there is an issue with the transmission, such as a broken gear, the tines won't turn. Stop using the machine immediately and inspect the transmission .
Since you mentioned that your tiller tines were turning fast after replacing the carburetor and then stopped turning after connecting the throttle cable, it's possible that there is an issue with the engagement cable. You may want to check if it's properly tensioned and connected to ensure that it's not causing any issues How To Fix Tines That Will Not Move - Tiller Repair

The PTO unit must be damaged.

Hello, Did you notice if the tines moved when you turned the belt pulley to install the new belt? If the tines do not move when you rotate the driven pulley by hand, the worm gear might be stripped. If the tines do move when you rotate the driven pulley by hand, the belt tensioner might not be working properly. It could be as simple as an adjustment.

If you cant move the tines by hand then I wouldn't think you sheared the pins, more like a gear box problem.

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

hello, upon inspection of the parts brake down looks like you have broken the drive chain inside of the trans to drive the wheels,there is no mencion if the belt and pulley turns and the wheels don't,did you check the belt and pulley?hope this helps,oh bring it over abd i will repair it,

It is the shift fork in the transmission. Bad part design and if you plan to take it apart, use sandpaper and really clean the wheel axle and tine axle before you take it apart.

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check the sher bolt on the tine to drive shaft. ill need model and ser number off the unit before i can go further with helping you thy changed them around a lot

It sounds like the belt just stretched. Now you need to move the belt tensioner over to put more pressure on it.

tilt the back of the tiller up and check for a rock or stick wedged in between the tines and the shield