ARM

The 870 859 89 DRIVE SHAFT (87085989, 870-859-89, ARM 87085989) is a mining-grade structural ARM engineered for Sandvik drilling rigs, ROC series machinery, and underground jumbos. The 870 859 89 DRIVE SHAFT supports mechanical linkages, hydraulic drives, and feed assemblies exposed to extreme vibration, drilling shock, and heavy-load operating conditions.

This 870 859 89 DRIVE SHAFT is manufactured from reinforced, high-strength steel with precision-machined interfaces to ensure stable mounting, accurate alignment, and long-term durability. Catalog identifiers 87085989 and 870-859-89 are widely referenced in OEM and aftermarket spare parts listings.

The 870 859 89 DRIVE SHAFT provides critical structural support and alignment within drilling assemblies, linking moving components such as boom joints, feed mechanisms, stabilizers, and actuators. Proper ARM rigidity improves drilling accuracy, minimizes mechanical wear, and maintains correct geometry under harsh mining and tunneling loads.

Inspect the 870 859 89 DRIVE SHAFT for cracking, deformation, weld fatigue, surface wear, or worn pivot interfaces. Replace immediately if any structural weakness is detected.

Also indicated as 87085989, 870-859-89, and ARM 87085989, this structural ARM is essential for maintaining stable mechanical geometry in heavy-duty drilling operations.