John Deere makes a sturdy lawn tractor tire, but sooner or later you'll need to give the tires on your L110 some attention. If you have a slow leak, one simple and effective fix is to inject a tube of tire leak sealant into the tire. If you have more significant damage and wear, it is time to replace the old tires. Don't fret, though, because it is not a job that will impact you much in terms of time or expense.
Park your L110 mower on level ground. Engage the brake, and turn off the engine. Secure the tires that will remain on the ground with wheel chocks.
Place a jack under the front or rear axle, and raise that half of the lawn tractor.
Clean the axle area with a rag. Pry off the yellow plastic cap that is attached to the end of the axle, revealing a small clip underneath.
Remove the clip with a screwdriver or pliers. Slide the wheel off the axle.
Clean the axle with a rag and coat it with a thin film of grease. Slide the new wheel on the axle and replace the clip with pliers. Snap the yellow plastic cap back in place.
Lower the L110 lawn tractor to the ground, and repeat the process with all bad tires.
Check the air pressure on all tires.