Dongfeng VL truck parts Upper bracket assembly of left oil cylinder 5003080-C4300

Built to withstand the static and dynamic forces of hydraulic oil cylinder operation (e.g., lifting, lowering, road impact), the bracket is crafted from 20Mn2 low-alloy structural steel—ideal for high-stress automotive hydraulic components. This material delivers a minimum yield strength of 345 MPa, tensile strength of 490–630 MPa, and impact toughness of ≥40 J at -40°C, enabling it to bear a maximum static load of 18kN without deformation (exceeding the VL’s left oil cylinder design load by 25%). The steel undergoes quenching and tempering (880°C quenching, 550°C tempering) to refine its microstructure, enhancing fatigue resistance—passing 2.5 million load cycles (equivalent to 1 million km of road use) without crack formation. Compared to ordinary Q345 steel brackets, this 20Mn2 design extends service life by 60% under frequent hydraulic cycling (e.g., daily cargo loading/unloading)

Engineered to minimize stress concentration and improve hydraulic force transfer, the bracket features a triangular reinforcement structure at the oil cylinder pivot area—distributing vertical and lateral forces (from oil cylinder actuation) evenly across the chassis side rail. It integrates 7mm-thick radial ribs (spaced 32mm apart) along the bracket’s length, increasing torsional stiffness by 45% and reducing twist during sudden oil cylinder activation. The oil cylinder pivot hole is machined to a surface roughness of Ra 0.8μm, ensuring tight fitting with the pivot bushing and minimizing clearance (≤0.3mm) to avoid cylinder wobble. Unlike flat-plate brackets that lack structural support, this optimized design maintains oil cylinder alignment even when the truck operates on uneven terrain, improving hydraulic system efficiency and reducing seal replacement frequency

Designed to resist corrosion from road salt, mud, and hydraulic oil (common in undercarriage environments), the bracket undergoes a five-stage protective process. First, a chemical degreasing and derusting treatment removes surface contaminants. Next, a zinc phosphate conversion coating (60μm thickness) creates a porous base for coating adhesion. Then, an electrophoretic primer (80μm) forms a uniform moisture barrier, preventing rust from forming on steel surfaces. A high-build epoxy mid-coat (70μm) fills minor surface defects, followed by a UV-stabilized polyurethane topcoat (50μm) that resists chipping, chemical damage (e.g., hydraulic oil, road deicers), and UV degradation. This coating system passes 1,500 hours of neutral salt spray testing without rust or peeling, ensuring durability in snowy, coastal, or mining regions

Designed for efficient replacement by fleet technicians, the bracket simplifies installation with user-friendly details. All mounting holes are drilled to H8 tolerance (ensuring perfect alignment with the VL’s M20 chassis bolts and M30 oil cylinder pivot bolts) and chamfered to avoid damaging bolt threads during assembly. The package includes 4 grade 10.9 high-tensile chassis bolts (M20×65mm) and 2 grade 8.8 pivot bolts (M30×80mm), pre-lubricated with molybdenum disulfide to prevent thread galling in high-temperature environments. Installation takes 40–50 minutes: remove the old bracket by detaching the oil cylinder and chassis bolts, align the new bracket’s reference marks with the chassis and oil cylinder, torque the chassis bolts to 280 N·m and pivot bolts to 450 N·m (per OEM specifications), and verify oil cylinder movement. Each unit undergoes dimensional inspection via CMM (Coordinate Measuring Machine), load-bearing testing, and coating adhesion checks, backed by a 24-month warranty against defects (e.g., cracking, coating peeling, dimensional inaccuracies)