Dongfeng KInland truck spare parts Return spring 3501N-064

Built as a critical component for maintaining the reset function of truck mechanical systems, this return spring is crafted from high-quality 60Si2MnA alloy spring steel—an industry benchmark for elastic performance. The material undergoes quenching and tempering treatment, achieving a tensile strength of 1800MPa and yield strength of 1600MPa, ensuring consistent elastic deformation under 500N working load. It features a maximum deflection of 80mm with a permanent deformation rate of ≤0.5% after 100,000 cycles, far exceeding the 3% industry limit. For Dongfeng Kinland’s air brake system, this stability ensures the brake pedal and friction plates reset quickly after braking, eliminating drag and reducing brake pad wear by 25%

Engineered to deliver uniform force distribution and reliable reset action, the 3501N-064 spring adopts a precision-coiled structure with strict dimensional tolerances. The coil pitch is calibrated to 15mm (±0.2mm) to ensure linear force output (50-500N) across the entire deflection range, avoiding sudden force changes that cause component jamming. The closed and ground end loops feature a flatness of ≤0.1mm, ensuring full contact with mounting surfaces and minimizing stress concentration. A gradual transition between the end loops and active coils reduces fatigue risk, while the spring’s spring rate (6.25N/mm) is optimized to match the brake chamber’s operating requirements, ensuring smooth pedal feel and consistent braking response

Optimized to endure the harsh conditions of truck operation, the return spring exhibits exceptional corrosion and fatigue resistance. It undergoes a three-step surface treatment: phosphating for rust priming, electrophoretic coating (20μm thickness) for corrosion barrier, and a top coat of oil-impregnated wax for long-term protection. This system passes 1500-hour neutral salt spray testing (ASTM B117) to prevent rust in coastal or saline-alkali areas, and resists chemical corrosion from road deicing agents. The 60Si2MnA steel’s fine-grain structure, enhanced by shot peening (coverage ≥95%), creates a compressive stress layer of ≥-400MPa on the surface, extending fatigue life to ≥200,000 cycles—twice the lifespan of aftermarket springs

The 3501N-064 return spring is designed to prioritize truck safety and reduce fleet maintenance costs. Its reliable reset performance ensures the brake system fully releases after each application, preventing overheating and brake fade—a leading cause of truck accidents. For the clutch system, it maintains proper release bearing alignment, reducing clutch disc wear and extending replacement intervals by 30%. The spring’s OE quality eliminates premature failure risks (common with low-grade alternatives), avoiding costly downtime caused by brake or clutch malfunctions (up to $800 per hour for long-haul fleets). Installation is simplified by its precise dimensions, requiring only standard tools and reducing labor time by 40%. Backed by a 1-year/150,000km Dongfeng warranty, it provides predictable maintenance expenses and enhances overall operational safety