KP3989-2 - Lincoln KP3989-2 Insulated Drive Roll Kit 3/64-1/16

Maximize Feeder Efficiency with Lincoln KP3989-2 Drive Rolls

For welders utilizing Lincoln Electric wire feeders, the KP3989-2 Drive Roll Kit is the standard for feeding 3/64" (1.2 mm) to 1/16" (1.6 mm) welding wires. This kit is specifically engineered to integrate seamlessly with compatible Lincoln wire drive systems, providing the mechanical advantage needed to push wire through the liner and gun cable with minimal resistance. Whether you are working in heavy fabrication, structural steel, or manufacturing, ensuring your drive system is equipped with the correct rolls is the first step toward achieving defect-free welds.

Technical Specifications and Fitment

The KP3989-2 is designed for specific wire diameters, bridging the gap between medium and heavy-gauge wires. The 3/64" to 1/16" range is commonly used for higher deposition rates and structural applications. These rolls are manufactured with high-grade materials that resist wear, even when feeding abrasive flux-cored wires or large solid wires over long shifts. The insulated hub design is a key technical feature, ensuring that the welding current is directed solely through the contact tip and not diverted through the drive assembly, protecting the feeder's internal components.

Preventing Feeding Issues

One of the most common causes of erratic arcs and poor weld appearance is an inconsistent wire feed speed. Worn or incorrect drive rolls can cause the wire to slip, leading to burn-back or stuttering arcs. Installing a fresh set of KP3989-2 rolls restores the positive grip necessary for a constant wire speed, which is critical for maintaining the correct voltage and amperage relationship during the weld. This simple upgrade can significantly improve operator control and weld consistency.

Installation and Maintenance

Installing the KP3989-2 is a straightforward process designed to minimize machine downtime. The rolls fit securely onto the drive shafts of compatible Lincoln feeders. When installing, it is important to ensure that the wire is properly seated in the groove and that the tension arm is adjusted according to the wire type—tight enough to prevent slip, but loose enough to prevent wire deformation. Keeping a spare kit of KP3989-2 rolls on hand is a best practice for any professional welding shop to ensure uninterrupted production.