Warranty: 1 YEARS ,Part name: SMJ box cover 3724421-C6300
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Body system
This right SMJ box cover (Part No.: 3724421-C6300) is exclusively engineered to match the Dongfeng GX right SMJ box (3724420-C6300), strictly adhering to the original factory’s dimensional specifications (length: 185-225mm, width: 105-135mm, height: 15-20mm) and contour. It perfectly aligns with the SMJ box’s mounting holes (4 pre-drilled positions) and edge grooves, ensuring a seamless fit without gaps. No trimming or modification is needed—directly replacing the original cover to maintain the SMJ box’s factory-level structural consistency
Product Attributes
Warranty: 1 YEARS ,Part name: SMJ box cover 3724421-C6300
PRODUCT DESCRIPTION
IP67-Grade Waterproof & Dustproof Sealing
The cover integrates a pre-installed nitrile rubber gasket (thickness: 2-3mm, compression rate: 30-40%) along its inner edge, which forms a tight seal with the SMJ box when fastened. This design meets IP67 waterproof and dustproof standards, effectively blocking rainwater, road salt, and dust from entering the SMJ box’s internal circuit. Even in harsh conditions like heavy rain or off-road driving, it prevents short circuits or corrosion of terminals, ensuring the SMJ system’s reliable operation
High-Strength & Anti-Aging Material
Made of OEM-specified ABS+PC composite material (glass fiber content: 15-20%), the cover boasts excellent mechanical strength—impact resistance ≥12 kJ/m², preventing cracking from minor collisions during maintenance. The surface is treated with anti-UV coating, which resists fading, brittleness, and deformation under long-term exposure to sunlight (-40°C to 85°C operating temperature range). Its service life reaches over 8 years, matching the durability of the original SMJ box
Tool-Minimal & Secure Installation
The cover adopts a bolt-fixed design, using 4 M4×8 stainless steel screws (compatible with the SMJ box’s original threads). Installation is completed in 5-8 minutes with a standard Phillips screwdriver—no specialized tools required. The screw holes are reinforced with plastic bosses (height: 5mm) to prevent thread stripping during repeated disassembly (supports ≥50 assembly cycles). Additionally, the cover features a small positioning notch that aligns with the SMJ box’s protrusion, avoiding reverse installation
Maintenance-Friendly & Label-Compatible Design
The cover’s smooth surface reserves space for pasting the original SMJ box’s function labels (e.g., "Terminal Layout," "Fuse Specification"), ensuring maintenance personnel can quickly identify internal components. It also has a recessed handle (width: 20mm, depth: 3mm) on one side for easy removal—no need to pry with tools, reducing damage to the cover or SMJ box. The edge is rounded (radius: ≥1mm) to prevent scratches on hands during installation and maintenance
TECHNICAL SUPPORT
1. Accessories selection consultation
- Provide ** intelligent selection tools ** (such as parts matching query system), input the vehicle model VIN code or engine model to match the corresponding parts number, reducing the selection error rate.
The technical team is available online 7×12 hours to answer technical questions about accessories (such as material compatibility and installation processes).
2. Customized development support
We offer specialized R&D services for special market demands (such as heat dissipation accessories for high-temperature regions in the Middle East and dedicated suspension components for road conditions in Africa), and complete sample delivery within six weeks.
3. Training and Technical materials
Provide remote/on-site training for the customer's after-sales team (such as diagnosis of electrical control accessories and DPF regeneration operation), along with multilingual versions of the "Accessories Installation Manual" and "Troubleshooting Guide".
4. Quality Traceability and Improvement
Through the QR code traceability system (one product, one code), track the production batch of accessories and the source of raw materials, respond quickly to quality complaints and initiate improvement processes.
AFTER-SALES AND LOGISTICS SUPPORT
After-sales service
Quality Assurance Policy
-The warranty period for original factory parts is 12 months (counting from the date of signature for receipt), covering material defects, process issues, and man-made damage.
- Provide "Localized Express repair Service" : Cooperate with third-party repair networks in markets such as Southeast Asia and the Middle East, and deliver emergency parts to designated repair points within 4 hours.
Return and Exchange Process
-The customer is required to submit the test report (such as a third-party appraisal) within the warranty period. After confirmation by Dongfeng, a reissue or refund will be arranged within 5 working days.
Logistics support
Warehouse Layout
-Five major regional accessory centers have been established globally (Southeast Asia, the Middle East, Africa, South America, and Europe) to achieve "next-day delivery" for mainstream accessories (covering customers within the regions).
Emergency Logistics Plan
-Emergency parts can be directly delivered within 48 hours via the "Dongfeng Exclusive Aviation Special Line" (such as engine ECU, brake valves and other key components).
Packaging Optimization
-Use shockproof and moisture-proof packaging (such as honeycomb cartons + pearl cotton), and reinforce fragile parts (such as glass, sensors), keeping the damage rate within 0.5%.
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