Refurbishment of Tandem Bearings for Extruder Gearboxes

Distitec designs and manufactures axial multistage (Tandem) bearings for plastic extruder gearboxes, applications where reliability, stiffness, and load uniformity are essential to ensure process continuity and long operating life.

These bearings are engineered to withstand high and continuous axial loads, typical of extrusion processes in which the extruder screw generates constant and significant thrust along its axis.

Over time, the raceways, rolling elements, and cages are subject to progressive wear, which can compromise accuracy and increase operating temperatures.

Why Refurbishing Multistage Roller Bearings Is a Smart Choice

When mechanical conditions allow it, bearing regeneration is a technically and economically advantageous solution because it:

• restores the original performance of the bearing,
• reduces lead times and costs compared to a new supply,
• contributes to sustainability by preventing the disposal of high-value metallurgical components and reducing environmental impact.

Distitec Bearing Refurbishment

Internal design and production of multistage roller bearings for extruders allow Distitec to know every detail of the geometry, tolerances, and functional relationships between components, enabling accurate and controlled refurbishment.

How We Refurbish Multistage Roller Bearings

Preliminary Analysis and Feasibility Check: Technical Criteria for Evaluating Refurbishment

Each refurbishment process begins with an in-depth assessment of wear conditions:

• inspection of rolling elements and cages,
• verification of wear on the raceways,
• analysis of spacer geometry and flatness.

Only when surfaces fall within allowable recovery limits can the refurbishing process proceed safely and accurately.

Operational Steps of Distitec Bearing Refurbishment

The refurbishment cycle includes:

• refurbishment or replacement of metal cages —manufactured in aluminum or bronze— according to the original geometry and after verifying structural integrity;
• complete replacement of rolling elements with new ones of identical class and grade;
• recalibration of contact surfaces through precision micro-grinding to restore optimal tolerances and surface finish.

All operations are carried out using high-precision grinding and measurement machines, ensuring very low final roughness values and full dimensional control of all functional surfaces.

Testing and Traceability

At the end of the process, the bearing is reassembled, measured, and tested to verify all functional parameters related to geometric and dimensional precision.

Each refurbished component is fully traceable and supplied with measurement reports and final inspection documentation to ensure full compliance with the original specifications.

Discover where Distitec precision is guaranteed: the testing room. 

The Distitec Advantage in Multistage Roller Bearing regeneration

Regeneration extends the service life of Tandem bearings while reducing costs, downtime, and environmental impact, without compromising manufacturing quality and precision.

A result made possible only by those who, like Distitec, design and manufacture these bearings internally and possess the expertise and equipment needed to restore them to their original condition.