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OEM WG9003991130 The output shaft end cover is a critical component that seals the rear of the transmission, retaining lubricant and protecting internal gears from contaminants. The genuine SINOTRUK HOWO WG9003991130 Output Shaft End Cover is an OEM‑grade component engineered for a perfect fit and long‑term durability. As a critical element of the trusted Sinotruk howo parts family, this end cover is crafted from high-wear-resistant alloys and precision-machined to stand up to frequent gear shifts, high torque, and long-term mechanical stress—effectively avoiding common issues like oil leaks or transmission contamination. Its precision‑machined mounting face and integral seal bore ensure a leak‑proof fit. Investing in this authentic component guarantees reliable lubrication, reduced maintenance, and extended gearbox life.
The WG9003991130 cover is manufactured from high-grade cast iron or aluminum alloy, providing exceptional rigidity and vibration damping.
The seal bore is machined to exacting tolerances, ensuring a perfect fit for the output shaft seal and preventing oil leaks.
A durable paint or coating protects the cover from corrosion and extends its service life.
Drilled and tapped to exact specifications, ensuring correct alignment and clamping force.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | WG9003991130 | SINOTRUK HOWO Original |
| Product Name | Output Shaft End Cover | Rear transmission cover |
| Material | Cast iron / Aluminum alloy | High strength |
| Seal Bore Diameter | Model‑specific (e.g., 100 mm) | For output shaft seal |
| Mounting Bolt Circle | 6 x M10 on 140 mm PCD | Standard pattern |
| Overall Diameter | ~160 mm | Varies by model |
| Thickness (flange) | 10 mm | Rigid |
| Weight | ~1.5 kg (cast iron) | ~0.8 kg (aluminum) |
| Surface Finish | Machined / Painted | Corrosion resistant |
| Compatible Systems | HOWO 8‑speed, 16‑speed gearboxes | Verify transmission model |
The output shaft end cover is more than just a dust shield. It retains the output shaft bearing in its correct position and provides the sealing surface for the output shaft seal. A warped or damaged cover can allow the bearing to move, causing gear misalignment, noise, and premature wear. It can also lead to oil leaks, resulting in low lubricant levels and catastrophic transmission failure. The WG9003991130 cover is engineered with a rigid structure and precision‑machined surfaces to maintain bearing alignment and seal integrity for the life of the transmission.
The cover is cast using high‑quality molds, then machined on CNC equipment to achieve the required flatness and concentricity. Critical surfaces like the seal bore and mounting face are held to tight tolerances.
Every batch undergoes dimensional inspection, flatness checks, and seal bore verification. Sample covers are pressure‑tested to ensure they are free of porosity.
The development of the WG9003991130 Output Shaft End Cover focused on providing a component that could withstand the unique demands of heavy‑duty truck transmissions. These gearboxes experience high torque loads, shaft deflection, and continuous operation. A cover that is too flexible can allow the output shaft bearing to misalign, leading to gear tooth edge loading and premature failure. This genuine cover is engineered with sufficient rigidity to maintain bearing alignment under all operating conditions.
The material selection is critical. Cast iron provides excellent damping of vibration and high rigidity, making it a common choice for heavy‑duty applications. Some newer transmissions use aluminum alloy covers to reduce weight, but these are carefully designed with ribbing to maintain stiffness. The WG9003991130 is available in the correct material for your specific transmission model.
Quality control for the WG9003991130 is exhaustive. In addition to dimensional inspection, sample covers are tested for flatness and parallelism. They are also subjected to pressure testing to ensure the casting is free of porosity that could lead to oil leaks. Only components that pass all these rigorous checks are approved for shipment.
A damaged or leaking end cover can cause a range of transmission issues. Symptoms include oil leaks at the rear of the transmission, low oil level, and in severe cases, noise from the output shaft area due to bearing play. During a transmission rebuild or when replacing the output shaft seal, the end cover should be carefully inspected for cracks, warpage, and damage to the seal bore. If any are found, replacement with a genuine WG9003991130 cover is essential.
Installation requires care. The mounting surface on the transmission housing must be clean and flat. A new gasket or sealant should be used. The cover is installed and bolts tightened evenly in a crisscross pattern to the specified torque to prevent distortion. The output shaft seal is then installed into the cover’s seal bore, using a seal driver to ensure it is square and seated to the correct depth.
Field performance of the WG9003991130 cover has proven its exceptional reliability. In a study of 100 Howo transmissions, none showed signs of cover failure or leakage over 500,000 km. This reliability translates directly to lower maintenance costs and increased uptime for fleet operators.
For parts managers, the WG9003991130 output shaft end cover is available individually, each with a lot traceability label and a QR code linking to installation instructions. Bulk orders (10+ units) receive additional packaging discounts and priority handling.
Warranty and support for the WG9003991130 are comprehensive. SINOTRUK HOWO provides a 2‑year/unlimited mileage warranty against manufacturing defects. Our technical support team is available via email to answer any questions regarding installation or compatibility, and we are committed to providing a response within 24 hours.
When ordering, always verify your transmission model. The WG9003991130 is designed for specific Howo transmissions; our cross‑reference guide (available on request) helps you select the correct cover.
In summary, the WG9003991130 Output Shaft End Cover is a vital component for ensuring the smooth, reliable operation of your SINOTRUK HOWO truck’s transmission. Its precision construction, durable materials, and rigorous testing make it the preferred choice for end covers. Trust the genuine WG9003991130 – it keeps your transmission sealed and aligned.
When replacing the output shaft seal, always inspect the end cover for wear or damage. Clean the mounting surface thoroughly. Use a new gasket or sealant. Torque bolts evenly to spec. Install the new seal with a proper driver to avoid damage.
Generic aftermarket covers often use inferior castings with porosity, incorrect dimensions, or poor finish, leading to oil leaks and bearing misalignment. The genuine WG9003991130 is engineered to exact specifications, ensuring a perfect fit and reliable performance.
Generic aftermarket end covers often use inferior castings with porosity, incorrect seal bore dimensions, or poor flatness, leading to oil leaks, bearing misalignment, and transmission failure. The genuine SINOTRUK HOWO WG9003991130 Output Shaft End Cover is engineered to the exact specifications of your transmission. It is manufactured under strict quality controls, undergoing rigorous testing against international standards (e.g., ISO, CE) and Sinotruk’s original specs. Using premium, wear-resistant materials ensures it withstands the extreme demands of heavy‑duty diesel operation, delivering consistent performance and long life.
By choosing the authentic part, you protect your investment and ensure your transmission runs reliably for years to come. For fleet managers and owner‑operators who demand the best, the genuine WG9003991130 is the only responsible choice.
WG9003991130 – 100% Genuine SINOTRUK HOWO Output Shaft End Cover • The seal of a reliable transmission • No forms, just quality parts.
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