Original Cummins engine parts Inert wheel shaft C5530874 in stocked

As the critical support for the idler gear, this shaft undergoes advanced precision machining to ensure stable rotation. The gear-mounting journal is ground to a surface roughness of Ra ≤0.1μm and a roundness error of ≤0.005mm, enabling the idler gear to rotate with a runout of ≤0.01mm—vital for maintaining valve timing accuracy. The 10mm×6mm keyway is milled with H9 tolerance, forming a tight connection with the idler gear’s key to prevent slippage even at the engine’s maximum speed (2800rpm). The flange end face features a flatness of ≤0.01mm, ensuring uniform force distribution when fastened to the cylinder block, which avoids eccentric wear of the idler gear and adjacent components

Engineered to bear continuous dynamic loads from gear meshing, the shaft is made of 42CrMo alloy steel with a tensile strength of ≥950MPa. It undergoes a targeted heat treatment process: the journal and keyway regions are quenched to HRC 50-53 for enhanced wear resistance, while the shaft body is tempered to HRC 28-32 to maintain toughness. This dual-hardness design balances rigidity and flexibility, allowing the shaft to withstand 80kN radial loads (from idler gear operation) without bending or deformation. Additionally, shot peening is applied to the shaft surface, creating a compressive stress of ≥-350MPa to improve fatigue resistance, ensuring no cracking after 80 million load cycles (equivalent to 250,000km of use)

Optimized to resist wear and corrosion in the engine’s high-temperature, oil-immersed environment, the shaft integrates multiple protective features. The gear-mounting journal is coated with a 0.04mm-thick chromium nitride (CrN) layer, which reduces the friction coefficient by 25% and prevents abrasive wear from metal particles in the oil. The entire shaft undergoes phosphating treatment followed by an electrophoretic coating (18μm thickness), passing 1200-hour neutral salt spray testing (ASTM B117) to avoid rust and corrosion. The flange’s M14×1.5 mounting threads are treated with anti-seize compound, ensuring easy disassembly even after long-term exposure to engine vibrations and temperature fluctuations

The inert wheel shaft is designed for efficient installation and long-term cost savings. Its precision-machined journal and keyway enable quick alignment with the idler gear, reducing assembly time by 35%—a single technician can complete replacement in 45 minutes. By maintaining stable idler gear rotation, it prevents timing system misalignment, avoiding costly valve-piston collisions (repair costs up to $5,000) and unplanned downtime. As a genuine Cummins part, it ensures full compatibility with the original engine components, eliminating the need for aftermarket adjustments. Backed by a 2-year/200,000km warranty, it reduces the frequency of replacements compared to low-quality alternatives, lowering overall maintenance costs for fleet operators and repair shops