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M1440 - Miller XR-Aluma-Pro Lite Replacement Liner .035-.045

Packaging: 1 per ea
$79.14/ea

Package Price:

$84.01/1 per ea

Usually ships within 3-5 business days

SKU: MILM1440 Categories: ,

OVERVIEW

Technical Overview of the Miller M1440 Liner Kit

The Miller M1440 Liner Kit is a critical replacement component engineered specifically for the Miller XR-Aluma-Pro Lite push-pull MIG gun series. In industrial aluminum welding applications, the integrity of the wire conduit is paramount to process stability. Aluminum filler metals, particularly 4000 and 5000 series alloys, are significantly softer than steel and prone to buckling or shaving if subjected to excessive friction or obstructions within the gun liner. The M1440 is manufactured to precise OEM tolerances to provide a low-friction path for wire diameters ranging from 0.035 inches (0.9 mm) to 0.045 inches (1.2 mm).

This liner kit addresses common failure modes in push-pull systems, such as erratic wire feeding, micro-arcing within the contact tip due to debris buildup, and the dreaded "birdnesting" at the drive rolls. By maintaining a smooth, consistent internal surface, the M1440 ensures that the synchronization between the feeder motor and the gun motor remains effective, delivering precise wire placement into the weld pool. Regular inspection and replacement of the gun liner are recommended as part of a preventive maintenance schedule, especially in high-duty-cycle environments where aluminum oxide accumulation can degrade liner performance over time.

The kit includes the necessary components to replace the existing liner in the XR-Aluma-Pro Lite assembly. It is not compatible with the standard heavy-duty XR-Aluma-Pro or other Miller push-pull guns, as the "Lite" series features distinct geometry and cable lengths. Utilizing genuine Miller parts like the M1440 guarantees that the liner length, outer diameter, and retention mechanisms align perfectly with the gun's back-end and head tube, preventing gas leakage or wire misalignment.

Key Technical Specifications:

  • Compatibility: Miller XR-Aluma-Pro Lite Only
  • Wire Range: .035" - .045" Aluminum
  • Part Number: M1440
  • Function: Wire guidance and friction reduction
Additional Information
Packaging Description:1 Per Ea, 1 per each
Brand:Miller
Item:Liner
Wire Size:0.035/0.045
Fits Which Model:Miller XR Alum Pro
Compatible Brand/Model:Miller XR-Aluma-Pro Lite
Wire Diameter:0.035", 0.045"
Part Number:M1440
Product Type:MIG Gun Liner
Application:Aluminum Welding

INCLUDED

  • 1 x Miller M1440 Liner Kit
  • Installation Components

APPLICATIONS

  • Aluminum Boat Building and Repair
  • Automotive Aluminum Fabrication
  • Sign Manufacturing
  • Trailer Manufacturing
  • General Aluminum Fabrication

FAQ

The M1440 is designed exclusively for the Miller XR-Aluma-Pro Lite push-pull gun. It will not fit the standard heavy-duty XR-Aluma-Pro or other Miller guns.

This liner kit is rated for aluminum wire sizes from 0.035 inches (0.9 mm) to 0.045 inches (1.2 mm).

Signs of a worn liner include erratic wire feeding, arc instability, excessive motor strain, or visible accumulation of aluminum shavings and debris at the wire entry or exit points.

While physically possible if the diameter matches, this liner is optimized for the XR-Aluma-Pro Lite which is primarily an aluminum welding gun. Steel wire is abrasive and may wear this liner out prematurely compared to liners designed for steel.

The M1440 kit typically includes the liner conduit itself. Consult the specific breakdown for your gun to see if additional retention parts like o-rings or collets are needed separately, though often the liner comes with necessary attached fittings.

Aluminum is soft and pliable. It requires a liner with very low friction and precise tolerances to prevent the wire from buckling (birdnesting) under the push force, which is less of a concern with stiff steel wire.

Yes, the M1440 is a genuine Miller Electric replacement part.

No, never lubricate a welding liner. Lubricants attract dirt and dust, which will quickly clog the liner and cause feeding problems. The liner material is designed to be low-friction on its own.

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