Park your John Deere LA145 mower on a level service and set the parking brake in the "Lock" position.
Turn off the mower and remove the key from the ignition. Locate the tire on the mower that has the chains you want to remove.
Disconnect the fastener rod that is located and connected to the rim of the tire by rotating it 180 degrees then pulling it off of the hook.
Pull the chain link from under the tire and unravel it so it becomes loose.
Remove the hook ends from the chain that connect part of the chain to the tire and rim to disengage the entire chain.
Lift up and remove the chain from the tire. Remove the chains from the other tires on the mower by following the same procedure.