The Lincoln Electric KP3991-25 is a specialized conduit liner assembly engineered specifically for use with the Magnum® PRO AL series of Push-Pull MIG guns. This component is critical for the reliable feeding of aluminum welding wire, which presents unique challenges compared to steel wire due to its softness and lower column strength. The liner is manufactured to precise tolerances to minimize friction and prevent wire shaving, a common issue that can lead to liner clogging and erratic arc performance.
Spanning 25 feet (7.6 meters) in length, this liner is designed to support extended reach applications often found in large-scale fabrication environments such as trailer manufacturing, shipbuilding, and aluminum structural work. It accommodates a wire diameter range from 0.035 inches (0.9 mm) up to 1/16 inches (1.6 mm), covering the most common sizes used in industrial aluminum MIG welding. The internal composition of the liner is selected to provide a smooth path for soft aluminum alloys like 4043 and 5356, ensuring consistent wire delivery from the feeder to the contact tip.
Proper maintenance of the conduit liner is essential for the longevity of the push-pull gun system. Over time, aluminum oxide and shavings can accumulate, increasing drag on the wire. Replacing the liner with the genuine Lincoln KP3991-25 ensures that the system operates at factory specifications. This part is a direct replacement for the original equipment found in Magnum PRO AL guns, guaranteeing perfect fitment and seamless integration with the existing gun backend and front-end consumables.
Installation involves removing the old liner from the gun cable assembly and threading the new KP3991-25 into place. Users should ensure the liner is trimmed correctly according to the gun's manual to prevent gaps that could cause wire feeding issues. By utilizing genuine Lincoln Electric parts, operators maintain the integrity of the Magnum PRO AL's "push-pull" mechanics, where synchronization between the feeder and the gun motor is vital for smooth operation.
| Additional Information |
|---|
| Packaging Description:1 Per Ea, 1 per each |
| Item:Liner |
| Brand:Magnum |
| Length :25 ft |
| Wire Type:Aluminum |
| Wire Diameter Range:0.035" - 1/16" (0.9mm - 1.6mm) |
| Material Application:Aluminum |
| ----- new values below ---- |
| Wire Diameter Range:0.035" - 1/16" (0.9mm - 1.6mm) |
| Compatible Gun Type:Push-Pull |
| Material Application:Aluminum |
| Brand:lincoln |
| Item:liner |
| Length:25-ft |
| Wire Type:aluminum |
| Packaging Description:1-per-ea |
| MIG Gun Model:Magnum® PRO AL |
