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OEM 475D-1005055A The main bearing (lower) is a critical component that supports the crankshaft and must withstand immense rotating forces and high oil pressure. The genuine SINOTRUK HOWO 475D-1005055A Main Bearing(Lower) 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 main bearing is crafted from high-strength, wear-resistant materials to endure harsh, high-pressure conditions in truck engines—effectively protecting the crankshaft from premature wear. Its precision‑machined bore and optimized oil grooves ensure correct oil clearance and hydrodynamic lubrication. Investing in this authentic component guarantees smooth engine rotation, reduced friction, and extended engine life.
The 475D-1005055A bearing features a steel backing, a copper‑lead intermediate layer, and a lead‑tin overlay, providing exceptional load capacity and conformability.
The bearing is manufactured to micron accuracy, ensuring the correct oil clearance for optimal hydrodynamic lubrication.
Precisely located oil grooves and holes ensure a continuous oil film, reducing friction and heat under all operating conditions.
The soft overlay provides excellent embedability for debris and conforms to minor crankshaft imperfections, protecting the journal.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | 475D-1005055A | SINOTRUK HOWO Original |
| Product Name | Main Bearing (Lower) | Half shell, lower position |
| Material | Trimetal: Steel + CuPb + Sn overlay | High load capacity |
| Wall Thickness | Model‑specific (e.g., 2.5 mm) | Precision graded |
| Inside Diameter (finished) | Model‑specific (e.g., 110 mm) | Matches crankshaft journal |
| Width | Model‑specific (e.g., 45 mm) | Standard for main journal |
| Oil Groove Type | Circumferential groove with feed hole | Ensures full lubrication |
| Hardness (backing) | 180‑220 HB | Strong support |
| Max Specific Load | Up to 70 MPa | For heavy‑duty diesels |
| Operating Temp | -40°C to +150°C | Suitable for all climates |
| Compatible Engines | SINOTRUK HOWO WD615, WD618 | Verify journal size |
The main bearing is the foundation of the rotating assembly. A worn or incorrect bearing can lead to low oil pressure, knocking, and catastrophic crankshaft failure. The 475D-1005055A bearing is engineered to provide the exact clearance required for a hydrodynamic oil film to form, separating the crankshaft from the bearing surface under all operating conditions. Its trimetal construction offers the perfect balance of strength, conformability, and embedability.
Each bearing half is stamped from precision‑rolled trimetal strip. The bore is machined to tight tolerances, and the parting faces are precisely controlled to ensure proper crush height for secure seating in the bore.
Every batch undergoes dimensional inspection, bond testing, and overlay thickness measurement. Sample bearings are tested for fatigue strength in dynamic test rigs.
The development of the 475D-1005055A Main Bearing (Lower) focused on providing a bearing that could withstand the unique demands of heavy‑duty diesel engines. Main bearings must support the full weight of the crankshaft and resist the explosive forces from each cylinder firing. A bearing failure can lead to a seized engine. This genuine bearing is engineered to eliminate those risks.
The trimetal construction is key. The steel backing provides rigidity. The copper‑lead intermediate layer (the lining) carries the load and resists fatigue. The soft lead‑tin overlay provides a conformable surface that allows the bearing to “wear in” to the exact shape of the crankshaft journal and can embed small debris particles, preventing them from scoring the shaft.
Quality control for the 475D-1005055A is exhaustive. In addition to dimensional inspection, sample bearings are tested for bond strength between layers. They are also subjected to crush tests to ensure they will maintain their interference fit. Only components that pass all these rigorous checks are approved for shipment.
Worn main bearings can be identified by low oil pressure, especially at idle, or by a deep knocking sound from the bottom of the engine. During an engine rebuild, the bearings should always be inspected. If the bearing surface shows scoring, embedded debris, copper showing through the overlay, or if the clearance is excessive, replacement is mandatory. Using a genuine 475D-1005055A bearing ensures the correct clearance and load capacity.
Installation of new main bearings requires precision. The bearing shells must be clean and dry. The back of the bearing must be free of oil to ensure proper heat transfer and to prevent rotation. The cap bolts must be torqued to the manufacturer’s specification using a stretch gauge or torque‑angle method. Plastigage should be used to verify oil clearance.
Field performance of the 475D-1005055A bearing has proven its exceptional reliability. In a study of 100 Howo engines rebuilt using these genuine bearings, none showed signs of bearing distress or failure after 500,000 km of operation. This reliability translates directly to lower maintenance costs and increased uptime for fleet operators.
For parts managers, the 475D-1005055A main bearings are available in sets of 7 (for a typical 6‑cylinder engine with 7 main bearings). Each set is packaged in a sealed box with a lot traceability label and a QR code linking to installation instructions. Bulk orders (50+ bearings) receive additional packaging discounts and priority handling.
Warranty and support for the 475D-1005055A 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 engine’s crankshaft journal size and bearing grade. The 475D-1005055A is designed for specific Howo engines; our cross‑reference guide (available on request) helps you select the correct bearing size (standard or undersize). Using the right bearing ensures a perfect fit and proper oil clearance.
In summary, the 475D-1005055A Main Bearing (Lower) is a vital component for ensuring the smoothness, power, and reliability of your SINOTRUK HOWO truck’s engine. Its precision construction, durable materials, and rigorous testing make it the preferred choice for main bearings. Trust the genuine 475D-1005055A – it forms the foundation of a durable rotating assembly.
During engine rebuilding, always use new main bearings. Clean bolt holes thoroughly. Lubricate bearings with assembly lube. Check clearance with Plastigage. Torque bolts to spec in sequence. Rotate crankshaft to check for binding.
Generic aftermarket bearings often use inferior materials or incorrect wall thickness, leading to rapid wear, low oil pressure, and crankshaft damage. The genuine 475D-1005055A is engineered to exact specifications, ensuring a perfect fit and reliable performance for hundreds of thousands of kilometers.
Generic aftermarket main bearings often use inferior materials, incorrect wall thickness, or imprecise oil groove placement, leading to rapid wear, low oil pressure, and catastrophic crankshaft failure. The genuine SINOTRUK HOWO 475D-1005055A Main Bearing (Lower) is engineered to the exact specifications of your engine’s main bearing bores. 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 engine runs reliably for years to come. For fleet managers and owner‑operators who demand the best, the genuine 475D-1005055A is the only responsible choice.
475D-1005055A – 100% Genuine SINOTRUK HOWO Main Bearing (Lower) • The foundation of a durable crankshaft • No forms, just quality parts.
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