Dongfeng KL truck parts Installation of beam assembly on the front roof 5704920-C3300

Built as a critical load-bearing component for the cab roof, this beam assembly features a robust design to boost structural rigidity. The main body is fabricated from Q960 high-strength steel (tensile strength 960MPa) via cold stamping, with a 5mm-thick web and 8mm-thick flanges—enhancing the roof’s resistance to bending and torsion by 60% compared to standard carbon steel beams. It acts as a central reinforcement, distributing loads (e.g., from roof-mounted accessories, snow accumulation, or minor impacts) evenly across the A-pillars and header beam. The beam’s U-shaped cross-section optimizes force transmission, reducing roof deflection to ≤2mm under a 500kg static load—preventing damage to the roof panel and ensuring the cab maintains its shape during rollover scenarios

Engineered to integrate with the Dongfeng KL’s roof-mounted systems, the 5704920-C3300 beam serves as a dedicated mounting platform for critical accessories. It features pre-punched holes and reinforced bosses for installing the roof air conditioner (Dongfeng OE 8103010-C3300), sunroof (Dongfeng OE 5401050-C3300), and GPS/4G antenna (Dongfeng OE 7920030-C3302). Each mounting point is reinforced with a 10mm-thick steel pad, capable of withstanding the dynamic load of the air conditioner (up to 80kg) during vehicle movement. The beam also includes integrated wire routing channels, organizing the electrical harnesses of roof accessories to avoid interference with the cab’s interior and ensuring easy maintenance. This integration eliminates the need for aftermarket mounting brackets that compromise structural safety

Optimized to resist corrosion in the harsh environment of the cab roof—exposed to rain, snow, UV radiation, and road salt—the beam assembly adopts an advanced protective coating system. The entire component undergoes shot blasting (Sa 2.5 grade) to remove surface impurities, followed by a cathodic electrophoretic primer (35μm thickness) for uniform rust prevention. The top layer is a polyester powder coating (45μm thickness) with excellent UV resistance, passing 3000-hour xenon lamp aging testing without fading. This system achieves 2000-hour neutral salt spray resistance (ASTM B117) with no rust, ensuring durability in coastal regions and snowy areas. The welding joints are sealed with anti-corrosion mastic, preventing moisture ingress and extending the beam’s service life to ≥800,000km

This front roof beam assembly is designed for efficient, precise installation and long-term cost savings for Dongfeng KL operators. The pre-marked welding tabs and bolt holes (positional tolerance ±0.5mm) allow a two-person team to complete installation in 3 hours using standard welding equipment and torque wrenches—no on-site cutting or drilling required. The OE-compatible design ensures perfect alignment with the cab frame, avoiding the misfit issues of aftermarket beams that cause roof leaks or structural weakness (repair costs up to $1,500). By enhancing roof rigidity, it reduces maintenance costs for roof accessories (e.g., preventing air conditioner misalignment) and extends the cab’s overall service life by 30%. Backed by a 3-year/500,000km Dongfeng warranty, it provides reliable structural support and predictable maintenance expenses, critical for fleet safety and operational efficiency