2109-1059A (140109-00038) Heavy-Duty Swing Bearing for Doosan S330LC-V S340LC-V DX340LC

Restoring Rotational Power to Mass Excavators

In large-scale earthmoving, quarrying, and heavy infrastructure projects, your 33-to-34-ton excavators like the Doosan / Daewoo S330LC-V and S340LC-V bear immense dynamic and axial loads. The swing bearing (slewing ring) is the essential structural foundation holding the upper house to the undercarriage. When internal wear causes cab rocking or gear grinding, performing a major upper-structure split is inevitable. You cannot risk installing an inferior part. Our heavy-duty 2109-1059A (140109-00038) swing bearing provides a mining-grade, immediate resolution, ensuring your massive machine regains safe, flawless rotation while protecting your project from excessive dealership costs.

Exact 140109-00038 Cross-Reference & Pinion Mesh

Major excavator overhauls demand absolute precision. This slewing ring assembly is engineered strictly to original Doosan factory dimensions, serving as a perfect drop-in replacement for OEM part numbers 2109-1059A and 140109-00038. More importantly, the internal gear teeth are precision-machined and hardened to ensure an exact, vibration-free mesh with your existing swing motor pinion gear. This critical integration prevents the catastrophic gear stripping and excessive backlash often caused by poorly manufactured aftermarket bearings.

Deep-Hardened Raceways for Severe-Duty Loads

Swinging fully loaded heavy-duty buckets or handling massive boulders puts catastrophic stress on the excavator's rotational axis. To prevent premature wear and failure, our Doosan 34-ton class swing bearing features deep-induction hardened raceways and premium rolling elements. Equipped with robust, multi-lip environmental seals to lock essential grease in and keep destructive rock dust out, this assembly guarantees thousands of hours of reliable performance in the harshest quarrying environments.