The left door opening assembly – OEM WG1642340034 – is the structural and functional core of the driver’s door system. It provides the mounting points for hinges, the door latch mechanism, and the check strap that limits door travel. A worn or damaged assembly can lead to door sag, misalignment, difficulty in closing, wind noise, water ingress, and even safety hazards in the event of an accident. This genuine HOWO assembly restores factory‑fresh operation, ensuring that the door opens and closes with a precise, solid feel every time. The robust steel construction and anti‑corrosion treatment guarantee that the assembly withstands constant vibration, temperature extremes, and exposure to road salts and moisture, maintaining its integrity for the lifetime of the vehicle.
Smooth, Effortless Operation
Precision‑machined hinge pins and bushings reduce friction, ensuring the door swings freely without binding or squeaking.
Superior Strength & Durability
Manufactured from high‑strength steel with electro‑coating (E‑coat) and topcoat for maximum corrosion resistance and structural rigidity.
OEM‑Exact Fit
Designed to Sinotruk’s original dimensions – direct replacement with no modifications, ensuring perfect alignment with the cab shell and door panel.
Reduced Noise & Vibration
Reinforced mounting points and precision‑fit components minimise rattles and wind noise, enhancing cabin comfort.
| Parameter | Specification |
|---|---|
| OEM Number | WG1642340034 |
| Product Name | Left Door Opening Assembly |
| Brand | HOWO / Sinotruk |
| Side | Left (driver side) |
| Material | High‑strength steel (SPCC / DC01 equivalent) with E‑coat and topcoat |
| Overall Height | ~ 1100 mm (varies by cab variant) |
| Width | ~ 450 mm (overall bracket width) |
| Operating Temperature Range | -40°C to +80°C |
| Surface Treatment | Electrophoretic coating + powder topcoat (colour matched to cab) |
| Quality Standard | Original Sinotruk / HOWO OEM specification |
The WG1642340034 left door opening assembly is a direct replacement for the original part used across a wide range of HOWO and Sitrak heavy‑duty trucks, including:
The WG1642340034 left door opening assembly is produced to the highest quality standards, ensuring it outperforms generic aftermarket alternatives. Every component – from the hinge brackets to the reinforcing plates – is precision‑stamped and welded using robotic processes to guarantee consistent geometry and structural integrity. The assembly undergoes a multi‑stage anti‑corrosion treatment: first a zinc‑phosphate wash, then an electrophoretic dip coating (E‑coat) that penetrates every crevice, followed by a durable powder topcoat that matches the original cab colour. This ensures that the assembly resists rust, stone chips, and chemical attack for the entire service life of the vehicle. Additionally, all hinge pins are hardened and ground to a mirror finish, and bronze bushings are pre‑lubricated for silent, maintenance‑free operation. Each assembly is dimensionally checked on a coordinate measuring machine (CMM) to guarantee perfect fitment to the cab aperture. This commitment to quality translates into years of trouble‑free door operation, reduced cab noise, and enhanced driver satisfaction.
Robotic Welding Accuracy
Precision‑controlled welding ensures consistent joint strength and dimensional stability, eliminating warpage.
Multi‑Layer Corrosion Protection
Zinc‑phosphate + E‑coat + powder topcoat – passes 480‑hour salt spray test per ASTM B117.
Hardened Pins & Bronze Bushings
Reduced friction and wear – hinge pins are induction‑hardened to HRC 50‑55 for extended service life.
100% Dimensional Inspection
Every assembly is CMM‑verified to ensure alignment with cab mounting points – no shimming required.
Installing the WG1642340034 left door opening assembly requires care and precision to ensure proper door alignment and function. Always refer to the appropriate workshop manual for your HOWO or Sitrak model. Start by removing the old assembly and thoroughly cleaning the cab aperture and mounting surfaces. Inspect the hinge pillar for any damage or corrosion – repair if necessary before fitting the new assembly. Position the new assembly in place, loosely attach the upper and lower hinge brackets, and then install the door check strap. Adjust the door to achieve even gaps and smooth operation – typically you will need to adjust the hinge positions in small increments. Once the door opens and closes freely with a consistent latch engagement, torque all fasteners to the specified values (typically 80‑100 Nm for hinge bolts, 25‑35 Nm for check strap bolts). Apply a thread‑locking compound to critical fasteners to prevent loosening under vibration. After installation, test the door operation, latch engagement, and check strap function. Lubricate the hinge pins and check strap pivot points with a lithium‑based grease.
Choosing the WG1642340034 genuine left door opening assembly is an investment in the long‑term reliability, safety, and comfort of your HOWO or Sitrak truck. Inferior aftermarket assemblies often use lower‑grade steel, inadequate corrosion protection, and imprecise hinge geometries – leading to premature wear, door sag, and expensive rework. By using a genuine OEM component that adheres to Sinotruk’s exacting standards, you guarantee a perfect fit, consistent door operation, and maximum corrosion resistance. Fleet operators and workshop professionals consistently trust this assembly to restore factory‑fresh door performance, reduce driver complaints, and lower overall maintenance costs. With its proven durability and precision engineering, it is the unequivocal choice for those who refuse to compromise on quality.
“We have replaced over 50 left door opening assemblies with the WG1642340034 across our HOWO‑7 fleet, and the results are outstanding. The fit is perfect, the doors close with a solid click, and we have had zero complaints about sticking or misalignment. This is the only assembly we trust for our cab repairs.”
The WG1642340034 left door opening assembly is designed to fit a comprehensive range of HOWO and Sitrak heavy‑duty trucks, including the most popular models in the market. It is a direct replacement for the original assembly fitted at the factory, ensuring a seamless swap without any modifications. Always confirm the OEM number WG1642340034 on your original part or by cross‑referencing your vehicle’s VIN with the Sinotruk parts catalogue. This assembly is not compatible with right‑hand drive variants – for the right side, please order the corresponding right door opening assembly (OEM WG1642340035). For any uncertainty, consult your local HOWO or Sitrak dealer with your chassis number.
HOWO and Sitrak trucks operate in some of the most punishing environments imaginable – from Arctic cold to desert heat, from coastal humidity to salt‑sprayed winter roads, and over rough terrain that subjects the cab to constant vibration and shock loads. The WG1642340034 left door opening assembly is engineered to withstand these extremes. Its high‑strength steel construction resists fatigue cracking even after millions of door cycles, while the advanced anti‑corrosion coating system ensures that rust never compromises the structural integrity. The hardened hinge pins and bronze bushings maintain their fit and lubrication properties across a wide temperature range, ensuring smooth operation in both freezing and sweltering conditions. This assembly is built to last, providing reliable door function for the entire service life of the vehicle, reducing the need for costly and time‑consuming repairs.
Extreme Temperature Range
Tested for reliable operation from -40°C to +80°C – no binding, seizing, or degradation.
Vibration & Shock Resistant
Robust construction withstands constant road vibrations and occasional impacts without loosening or fatigue.
Corrosion Protection
Multi‑layer coating passes 480‑hour salt spray test, providing long‑term resistance to rust and chemicals.
High Cycle Life
Designed for over 200,000 door opening cycles without significant wear – exceeds OEM durability requirements.
The WG1642340034 left door opening assembly is supplied in robust, purpose‑designed packaging to ensure safe delivery and convenient storage. Each assembly is individually wrapped in anti‑corrosion paper and secured within a heavy‑duty cardboard carton with foam inserts to prevent any damage during transit. The package includes the fully assembled hinge bracket structure, pre‑installed hinge pins and bushings, and all necessary mounting hardware (bolts, washers, and check strap brackets). Bulk ordering options are available for workshops, fleet maintenance depots, and OEM service centres, offering significant cost savings and streamlined inventory management. Every pack is clearly labelled with the OEM number WG1642340034, product name, and applicable vehicle models for easy identification. Always verify the OEM number on the label before installation to guarantee you are using the correct genuine component.
OEM: WG1642340034 | Genuine HOWO / Sitrak Left Door Opening Assembly
Choose WG1642340034 left door opening assembly – the professional‑grade cab component that delivers perfect door alignment, exceptional durability, and reliable operation for your HOWO or Sitrak truck.
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