Some common John Deere mower repairs are cleaning or replacing fuel lines, replacing spark plugs, replacing worn belts- and sharpening or cleaning mower blades. These four repairs fix numerous issues.
If the plugged fuel lines have been replaced and the mower still starts poorly or runs sluggishly, it might also be necessary to replace the fuel filter. Loose wires can also need to be reattached and fuses can burn out and need replaced.
John Deere mowers can also have trouble if not completely broken in or if broken in improperly. In this case and if the mower is new, John Deere recommends repeating the break-in process or adding 5 hours to the mower's break-in time before looking at things to repair.