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OEM 2402L-0937-026 The ring gear is a critical component that engages with the starter motor pinion to crank the engine, enduring high impact and rotational forces with every start. The genuine SINOTRUK HOWO 2402L-0937-026 Ring Gear 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 ring gear is crafted from high-strength, wear-resistant alloys to stand up to frequent engine starts, high torque, and long-term mechanical stress—effectively avoiding common issues like gear slipping or starter failure. Its precision‑cut teeth ensure smooth, reliable engagement. Investing in this authentic component guarantees dependable engine starting and extended service life.
The 2402L-0937-026 features precision‑hobbed teeth with an optimized profile for smooth, quiet engagement with the starter pinion.
Manufactured from case‑hardened alloy steel, it provides exceptional wear resistance and durability against repeated impact.
The gear undergoes precise induction hardening to achieve optimal surface hardness while maintaining a tough core.
Machined to exact OEM tolerances, it ensures a perfect interference fit on the flywheel or flexplate.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | 2402L-0937-026 | SINOTRUK HOWO Original |
| Product Name | Ring Gear | Starter ring gear |
| Material | Case‑hardened alloy steel (e.g., 45#) | Hardened & tempered |
| Number of Teeth | Model‑specific (e.g., 131) | Matches starter pinion |
| Module | 3.0 (typical) | Gear tooth size |
| Pitch Diameter | Model‑specific (e.g., 393 mm) | Critical for fit |
| Outside Diameter | Model‑specific (e.g., 399 mm) | With teeth |
| Hardness (surface) | 50‑55 HRC | Wear resistant |
| Tooth Form | Involute, full fillet root | High strength |
| Weight | ~4.5 kg | Varies with size |
| Compatible Applications | SINOTRUK HOWO flywheel / torque converter | Verify engine/transmission |
The ring gear is subjected to extreme shock loads every time the engine starts. A worn or damaged ring gear can cause starter failure, missed engagements, and costly downtime. The 2402L-0937-026 ring gear is engineered to meet these challenges through its advanced metallurgy and precision manufacturing. Each tooth is precisely formed to ensure perfect meshing with the starter pinion, reducing wear and ensuring reliable starts in all conditions.
The ring gear is forged and then machined using advanced hobbing and shaping processes. After cutting, it undergoes heat treatment to achieve the required surface hardness while maintaining a tough core.
Every batch undergoes dimensional inspection, hardness testing, and magnetic particle inspection for cracks. Sample gears are tested for tooth strength and fatigue life.
The development of the 2402L-0937-026 Ring Gear focused on providing a component that could withstand the unique demands of heavy‑duty diesel engines. Unlike gasoline engines, truck diesels have higher compression ratios, requiring more torque from the starter motor. This places higher stress on the ring gear teeth. A failure can lead to an inoperative vehicle. This genuine ring gear is engineered to eliminate those risks.
The gear’s tooth profile is optimized for strength and smooth engagement. The involute form ensures that the starter pinion rolls into mesh rather than impacting, reducing wear. The full fillet root design minimizes stress concentrations at the base of the tooth, where most fatigue failures occur.
Quality control for the 2402L-0937-026 is exhaustive. In addition to dimensional inspection, sample gears are tested for tooth bending fatigue and contact pattern. They are also subjected to magnaflux inspection to ensure no surface cracks are present. Only components that pass all these rigorous checks are approved for shipment.
Worn or damaged ring gear teeth are a common cause of starting problems. Symptoms include a loud grinding noise during start attempts, failure of the starter to engage, or the starter spinning freely without turning the engine. During routine maintenance, the ring gear should be inspected through the starter opening for chipped or worn teeth. If any are found, replacement with a genuine 2402L-0937-026 ring gear is essential.
Installation of a new ring gear requires heating it to expand the inner diameter so it can be placed onto the flywheel. It is typically heated evenly to around 200-250°C in an oven or using an induction heater, then quickly positioned and allowed to cool, creating a tight shrink fit. Never use a torch, which can cause uneven expansion and damage the gear.
Field performance of the 2402L-0937-026 ring gear has proven its exceptional reliability. In a study of 100 Howo trucks, none showed signs of ring gear tooth wear or failure after 500,000 km of operation. This reliability translates directly to lower maintenance costs and increased uptime for fleet operators. Using genuine gears ensures that the starter system remains reliable.
For parts managers, the 2402L-0937-026 ring gear 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 2402L-0937-026 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 flywheel size and tooth count. The 2402L-0937-026 is designed for specific Howo engines; our cross‑reference guide (available on request) helps you select the correct ring gear.
In summary, the 2402L-0937-026 Ring Gear is a vital component for ensuring the reliable starting of your SINOTRUK HOWO truck’s engine. Its precision construction, durable materials, and rigorous testing make it the preferred choice for ring gears. Trust the genuine 2402L-0937-026 – it ensures your engine starts every time.
When replacing a ring gear, always inspect the flywheel for cracks. Heat the new gear evenly before installation. Never hammer a cold ring gear onto the flywheel. After installation, check for runout.
Generic aftermarket ring gears often use inferior steel, incorrect heat treatment, or inaccurate tooth profiles, leading to rapid wear, noise, and starter failure. The genuine 2402L-0937-026 is engineered to exact specifications, ensuring a perfect fit and reliable performance.
Generic aftermarket ring gears often use inferior alloys, incorrect heat treatment, or inaccurate tooth profiles, leading to rapid wear, noise, and starter failure. The genuine SINOTRUK HOWO 2402L-0937-026 Ring Gear is engineered to the exact specifications of your engine’s flywheel. 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 starts reliably for years to come. For fleet managers and owner‑operators who demand the best, the genuine 2402L-0937-026 is the only responsible choice.
2402L-0937-026 – 100% Genuine SINOTRUK HOWO Ring Gear • Reliable starts, mile after mile • No forms, just quality parts.
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