9SS17435 - Lincoln S17435 Spindle Brake Washer

Technical Overview of the Lincoln S17435 Friction Washer

The Lincoln Electric S17435 Friction Washer is a specialized component engineered for the wire reel spindle assembly found in a wide range of Lincoln Electric wire feeders and integrated MIG welding machines. This washer serves a critical mechanical function within the wire feed system: it acts as the primary braking element for the wire spool. Positioned within the spindle hub assembly, the washer creates controlled friction against the rotating components.

When a welding operator releases the gun trigger, the wire drive motor stops almost instantly. However, a heavy spool of welding wire carries significant rotational inertia. Without the resistance provided by this friction washer, the spool would continue to spin (coast), feeding excess wire into the cabinet or onto the floor. This phenomenon, often referred to as "overrun," frequently leads to wire tangles, "bird-nesting," and potential electrical shorts within the machine. By maintaining a constant, adjustable drag on the spool, the S17435 washer ensures that the wire stops precisely when the arc is extinguished.

This OEM part is manufactured from durable friction material designed to maintain consistent performance despite the heat and wear generated during long welding shifts. It is a direct replacement for the original washer found in popular models such as the LN-7, LN-25, LN-8, LN-9, and various Power MIG series units. Proper maintenance of the spindle assembly, including the replacement of worn friction washers, is essential for maintaining consistent wire tension and ensuring smooth, trouble-free feeding.