Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hello. Thank you for choosing Just Answer. I will be happy to assist you. There is a small square, metal keystock, that slides into a slot in your wheel, and into your axle. The keystock locks your axle, to your wheel, to allow your axle to turn your wheel, as you are driving your lawn tractor.
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Here is another image for you.