Using this Lincoln Magnum Pro AL MIG gun is easy. First, make sure you have the right Magnum PRO consumables installed. The 550A expendables come standard with this gun. When you start welding, the superior push - pull wire feeding technology will ensure the wire moves smoothly. If you need to change the liner, simply remove the liner nut. While using it, be careful not to accidentally change the settings on the recessed adjustment dial at the back of the handle. For maintenance, regularly check the wire and drive rolls. You can easily access them by removing the drive roll cover. Keep the gun clean and dry to ensure its long - term performance. Also, store it in a safe place when not in use to avoid any damage.