6839820 Bearing Assembly Allison spare parts

6839820 Bearing Assembly Allison spare parts

The 6839820 bearing assembly is an OE-grade integrated bearing unit specifically developed for Allison MD 3000 series and HD 4000 series heavy-duty automatic transmissions. It strictly adheres to the SAE J1995 rolling bearing standard, ISO 3049-1 load and fatigue testing specifications, and GB/T 3077-2015 alloy structural steel standard. It has passed ISO 9001 quality certification, impact load testing, high-temperature durability testing, and low-friction torque testing. It combines high load-bearing capacity, vibration stability, and long-term wear resistance, and is widely used in heavy-duty equipment equipped with Allison MD/HD series transmissions, such as heavy-duty trucks, mining machinery, port cranes, construction machinery, and oilfield equipment.

Core technical parameters:

– Product Model: 6839820
– Material specifications: Inner ring/outer ring (GCr15 high carbon chromium bearing steel, carburized and quenched, hardness HRC 62~65), rolling elements (GCr15 bearing steel, precision ground), cage (solid brass cage, high rigidity and impact resistant), seals (fluororubber/FKM seals)
– Operating temperature: -40℃~180℃
– Rotation and load-bearing performance: Rated dynamic load ≥280kN, rated static load ≥420kN, coefficient of friction ≤0.002, smooth rotation without jamming or abnormal noise, dynamic balance accuracy ≤0.03g·cm.
– Structural parameters: Inner diameter 60mm × outer diameter 110mm × length 28mm, number of rolling elements 18 (evenly distributed), sealing cap thickness 2.5mm.
– Wear resistance: The surface is nitrided, the wear-resistant layer thickness is 0.1~0.2mm, and the wear rate is ≤0.001mm/1000 hours.
– Compatible Models/Scenarios: Core compatibility with Allison MD 3000 series and HD 4000 series heavy-duty automatic transmissions, widely used in heavy-duty equipment such as heavy trucks, construction machinery, mining equipment, port equipment, and oilfield equipment. It is compatible with core transmission components such as transmission input shaft, intermediate shaft, and differential end, and can directly replace the original corresponding bearing assembly. It meets the maintenance needs of transmission overhaul and transmission system replacement, and is suitable for complex working scenarios with heavy loads, high-frequency rotation, and strong impacts.
– Service life: Under normal heavy-load conditions, the service life can reach more than 20,000 hours, and the continuous operation without failure time is ≥12,000 hours.

The 6839820 bearing assembly, with its precise original factory fit, superior load-bearing and impact resistance, and long-lasting wear resistance, has become the core preferred component for the repair and overhaul of Allison MD/HD series heavy-duty gearbox transmission mechanisms. We strictly control the production process; each product undergoes dimensional accuracy testing, rotational performance testing, wear resistance testing, impact resistance testing, and sealing performance testing to ensure compliance with original factory standards, SAE J1995, ISO 3049-1, GB/T 3077-2015 standards, and industrial usage requirements. We also provide comprehensive after-sales support and standardized packaging for bulk purchases, resolving various issues customers encounter during procurement and use. It is suitable for the bulk use needs of repair shops, gearbox overhaul centers, and heavy equipment after-sales service stations, helping heavy equipment gearbox transmission systems achieve long-term stable and efficient operation.

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