How do you get started John Deere XL176 38 to run again

https://www.vbeltguys.com/products/john-deere-175-belt-drive-riding-lawn-mower-replacement-belt

https://www.greenpartstore.com/Model-175_c_23-3-3.html

https://sites.uni.edu/peterson/John%20Deere%20175%20Tractor/

https://www.youtube.com/watch?v=cq_8TyhIP0Q

engine will quit when get off seat thats the safety --check the cable and deck actuator for engagement problem

check belt and pulleys --if belt to loose wont turn blades to cut the grass

You have indicated a bad battery. There is enough charge in the battery to start and run buy not enough when you engage the blades. Check the battery by load testing it and checking with a multi-meter.

sounds like the wrong size belt or pulley

check routing of the belt also

Some mowers have a mowing reverse safety switch. That safety will kill the mower if you try to reverse with the deck engaged. Some mowers even have an override button that has to be held while backing up. As for the battery thing, no matter how much you charge a bad battery you will not get it to start a mower if it has a bad cell or two. I would use a multimeter to check battery voltage, but the end result would still be the same, replace the battery.

I hope this gets you going again.

Have you checked to see if the battery is charging

Check that the belt is the correct length, and check that the idler is on the correct side or the belt.

I have a john deere 14sb lawn mower that will start and run for about one minute and die wont start again until later.