Toro turn lawnmower will not turn on the one side when push the o handle forward

usually if the pins are pulled out that is the freewheel position. push them in to drive. if the trans locks in drive and it is hard to push it should be ready to mow. unless the drive belt is stretched or broken or a linkage is out of adjustment or broken.

1) has the mower been turned on its side recently?
2) Oil level? too full? gasoline smell ?
3) Replace the air filter
4) When cleaning mower, always keep the air filter up. Turn it on its left side.

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

check the drive belt that goes from the motor to the pumps

You might want to post this question in the lawnmower section so that the proper expert sees it.

You should post this question in the lawnmower section so the proper expert will see it..

first check the air pressure in the tires make sure they are the same then move the linkage rods on the slower side to balance the speeds out if it doesn't balance out you might have a pump or drive motor failing each side has its own pump and drive motor assuming you already check the fluid level

Thanks so much Jamie. I had the top of the handle off but couldn't get any
further. I had to use a screwdriver on one side to get the brass bar out of the
plastic channel (I was afraid I would crack the plastic but didn't). I was able to remove the bar from the handle by myself with lots of effort ( BTW in your
solution did you mean your son pulled vertically up on the handle while you pushed vertically down on the bar?). I had one foot on one side of the handle and pulled up on the other side while pushing down on the bar. Isn't the web and Google amazing. The Toro sight didn't have a service manual. So I just typed "How to replace the torsion spring on a toro lawnmower" in Google an the question came up. I think Toro has a design issue with an overstress point on the spring. That part is on back order at the factory.
I did it.

i dont know your model but most drive belts are located under the seat you may have a tenson spring problem

Remove the left wheel and check the gears inside the wheel and the drive sheft. They might be worn or sheared and need renewing or maybe they just need oiling. Spray them with WD 40.

the spider gears are in on the wrong side more less like you put the rear end in backwards