Dongfeng KL truck parts Lower the left support of the adjustment rod 8407255-C3300

Built to withstand the tension and compression forces of the adjustment rod (up to 500N during operation), the support uses high-grade structural steel for exceptional load capacity. The main body is crafted from 4.2mm-thick Q345B low-alloy steel (tensile strength 470–630 MPa), capable of withstanding static loads of 1,000N (2x the rated working load) without bending or deformation. The adjustment rod mounting sleeve is reinforced with a 6mm-thick steel insert, preventing wear from repeated rod movement and ensuring a tight, stable fit. Unlike thin mild steel or aluminum supports that fatigue over time, this heavy-duty design endures 200,000+ adjustment cycles (equivalent to 6 years of heavy use) without structural failure, ensuring the adjustment rod remains securely positioned

Engineered to resist corrosion from road salt, rain, mud, and humidity (critical for underbody-mounted components), the support features a comprehensive three-stage anti-corrosion treatment. First, it undergoes zinc phosphate pretreatment (for enhanced coating adhesion), then an electrostatic epoxy primer (55μm thickness) to block moisture intrusion, followed by a black polyester topcoat (65μm thickness) that matches the chassis’s underbody color. This coating system passes 900 hours of neutral salt spray testing (equivalent to 7 years of road salt exposure) without rust, peeling, or fading. The mounting holes are coated with anti-seize compound to prevent thread corrosion, ensuring easy disassembly during maintenance or adjustment rod replacement. Unlike single-layer painted supports that rust within 1–2 years, this design maintains structural integrity in harsh underbody environments

Designed to support smooth, precise movement of the adjustment rod, the support integrates features that minimize friction and maintain stability. The adjustment rod mounting hole is precision-machined with a surface roughness of Ra ≤ 0.8μm, reducing sliding friction between the rod and support—ensuring the rod moves freely during adjustment without binding. A rubber O-ring (70 Shore A hardness) is embedded in the mounting sleeve, creating a buffer that absorbs vibration from the chassis, preventing noise caused by metal-to-metal contact and reducing wear on the rod. Additionally, the support’s triangular structure enhances rigidity, preventing flexing during rod operation and ensuring consistent adjustment accuracy. Unlike poorly designed supports that cause rod jamming or imprecise adjustment, this design guarantees smooth, reliable functionality

Designed for hassle-free replacement by fleet technicians or DIY owners, the support includes precision-machined features to simplify setup. All 4 mounting holes (3 for chassis attachment, 1 for adjustment rod) are drilled with H9 tolerance (ensuring perfect bolt fit) and deburred to avoid damaging fasteners. Two laser-etched alignment marks align with reference points on the chassis and adjustment rod, eliminating guesswork and reducing installation time by 30%. Unlike supports with misaligned holes that require reaming, this design allows direct attachment using standard hand tools (socket wrench, torque wrench) to OEM-specified torque: 35 N·m for chassis bolts, 25 N·m for adjustment rod fasteners. Installation takes 15–20 minutes, even for first-time users. Each unit undergoes dimensional verification via CMM, load-bearing testing, and corrosion resistance checks, backed by a 24-month warranty against defects (e.g., bending, rusting, hole misalignment)