C4934862 XCMG GR2605 motor grader crankshaft

C4934862 is an OEM-specification crankshaft designed specifically for Cummins ISB, ISDe, and QSB series engines. As a core rotating component of the engine, its primary function is to convert the linear reciprocating motion of the pistons into rotational power for external output. Precision-forged from high-strength steel and subjected to rigorous heat treatment, dynamic balancing, and precision journal grinding, this crankshaft exhibits exceptional strength, fatigue resistance, and wear resistance. It is capable of withstanding severe operating conditions—including heavy loads and high-frequency impacts—thereby ensuring stable power transmission and smooth engine operation. It is ideally suited to meet the demands of long-term, continuous operation in various commercial vehicles and construction machinery. This component serves as a direct replacement for the legacy model, 3974538.

Technical Specifications

– Model: C4934862 (Old Model: 3974538)
– Type: Engine Forged Crankshaft
– Material: High-Strength Forged Steel
– Compatible Engines: Cummins ISB6.7, ISDe6.7, QSB6.7, and similar series
– Structure: Integral, fully-supported design featuring integrated main journals, connecting rod journals, thrust surfaces, and counterweights; includes dedicated oil passages to minimize stress concentration
– Precision: Precision-ground journals with certified dynamic balance; main journal coaxiality error ≤ 0.05mm, ensuring stable operational accuracy
– Lubrication: Features internal, through-flow oil passages designed to integrate with the engine’s pressure lubrication system, ensuring thorough lubrication of journals and mating components
– Operating Conditions: Suitable for heavy-duty applications, continuous high-load operation, high-temperature environments, and scenarios involving significant vibration and shock (e.g., construction machinery and vehicle applications)
– Replacement Models: 3974538, 3974635, 4934861, 5301009, 3968164, 4988175

Compatible Applications

Primarily installed in various types of equipment powered by Cummins 6.7L electronically controlled engines. It is seated within the main bearing saddles of the engine block; it connects to the pistons via connecting rods, transmits power output through a flywheel at the rear end, and drives the valve train and accessory systems at the front end. Specific applications include:

– Commercial Vehicles: Cummins ISDe series commercial vehicles, such as the Dongfeng Tianlong and Dongfeng Tianjin
– Construction Machinery: Equipment powered by QSB6.7 or ISB6.7 engines, including wheel loaders, excavators, motor graders, and bulldozers
– Stationary Power: Stationary power equipment such as 80–160kW diesel generator sets and water pump units
– Additional Vehicle Compatibility: Heavy-duty vehicles from manufacturers such as Shacman and FAW equipped with the corresponding Cummins engines.