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The AZ2210040711 ring is a genuine SINOTRUK HOWO component engineered to provide precise axial retention and spacing within heavy‑duty transmissions. As a critical element of the trusted Sinotruk howo parts family, this ring ensures that gears, bearings, and synchronizers remain in their correct positions under the extreme loads of mining, construction, and long‑haul applications. Manufactured from high‑strength alloy steel with precision‑ground surfaces, the AZ2210040711 ring maintains exacting tolerances to prevent axial movement and reduce wear. Its case‑hardened construction resists deformation and fretting, guaranteeing long‑term reliability. Investing in this authentic component ensures smooth shifting and extended transmission life.
Ring
Кольцо
Anillo
The AZ2210040711 ring is precision‑machined from high‑quality alloy steel (20MnCr5) and then case‑carburized to a depth of 0.8‑1.2 mm, achieving a surface hardness of 58‑62 HRC. This heat treatment provides exceptional resistance to wear and plastic deformation under high contact pressures. The inner and outer diameters are ground to tight tolerances (IT6), ensuring accurate fit on shafts and in bores. The ring also features carefully deburred edges to facilitate assembly and prevent damage to seals or bearings during installation.
Each AZ2210040711 ring is 100% inspected for dimensional accuracy, including concentricity, roundness, and surface finish. The part is also subjected to magnetic particle inspection to ensure freedom from cracks or material defects. This rigorous quality control guarantees that the ring will maintain correct gear spacing under all operating conditions, reducing noise and vibration while extending the life of adjacent components.
The table below provides detailed technical data for the genuine SINOTRUK HOWO AZ2210040711 ring. These specifications are essential for verifying compatibility.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | AZ2210040711 | SINOTRUK HOWO Original Code |
| Product Name | Ring (Retaining / Spacer) | For transmission gear positioning |
| Material | 20MnCr5 alloy steel | Case‑hardened |
| Outer Diameter | 85.0 mm | h6 tolerance |
| Inner Diameter | 70.0 mm | H7 tolerance |
| Thickness | 5.0 mm | ±0.05 mm |
| Surface Hardness | 58‑62 HRC | Case depth 0.8‑1.2 mm |
| Core Hardness | 30‑38 HRC | Toughness |
| Surface Finish (Ra) | ≤ 0.8 µm | On functional surfaces |
| Concentricity | ≤ 0.02 mm | ID to OD |
| Applicable Transmissions | HW19710, HW19712, HW25716 | Specific gear positions |
| Included Components | Ring only | Check service manual |
The AZ2210040711 ring is used in Howo 9‑speed and 16‑speed manual transmissions, including the HW19710, HW19712, and HW25716 series. It is typically installed on the main shaft or countershaft to maintain precise axial positioning of gears, ensuring correct engagement with synchronizers and preventing end‑float that can lead to gear clash and premature wear. Proper spacing is critical for the transmission to handle high torque loads without binding or excessive clearance.
In heavy‑duty applications such as mining and construction, the transmission experiences constant shock loads and temperature variations. The AZ2210040711 ring must maintain its dimensions and hardness to avoid loosening or deformation. Genuine SINOTRUK HOWO rings are engineered to withstand these conditions, ensuring that gear alignment remains within specification for hundreds of thousands of kilometers. Using an inferior ring can result in misalignment, increased noise, and accelerated wear of gears and bearings.
When rebuilding a transmission, always measure the end‑play of gear assemblies and replace rings if they show signs of wear or if the clearance exceeds service limits. Use new retaining rings as required.
Correct installation of the AZ2210040711 ring is essential to ensure proper gear spacing and transmission function. Follow these steps:
Clean the shaft and bore thoroughly, removing any burrs or debris. Inspect the surfaces for damage. Lightly oil the ring to ease installation.
Slide the ring onto the shaft or into the bore by hand. If interference fit is required, use an arbor press and a suitable driver that contacts only the ring end. Ensure it seats fully against the shoulder.
After assembly, measure the end‑play of the gear stack. Rotate the gears to ensure smooth operation. Secure any retaining rings correctly.
A worn or damaged ring can cause excessive gear movement and transmission noise. Common signs that replacement is needed include:
If any of these symptoms are observed, immediate replacement with a genuine AZ2210040711 ring is recommended. Ignoring ring wear can lead to gear tooth damage and costly transmission overhauls.
The tight tolerances ensure correct gear positioning, reducing wear and improving shift quality.
By maintaining correct clearances, the genuine ring prevents premature bearing and gear failure, reducing downtime.
Case‑hardened alloy steel provides superior wear resistance and dimensional stability under load.
To maximize the service life of your AZ2210040711 ring, follow these best practices:
By adhering to these guidelines, you ensure that the AZ2210040711 ring performs optimally throughout its intended service interval.
Aftermarket rings are often made from lower‑grade steel with inconsistent hardness and poor dimensional control, leading to rapid wear and incorrect gear spacing. The genuine AZ2210040711 is manufactured to the exact specifications of the original equipment, using premium alloy steel and precise heat treatment. Each ring is inspected for hardness, concentricity, and surface finish, guaranteeing that it will perform exactly as the original part.
By choosing authentic SINOTRUK HOWO parts, you protect your investment and ensure your truck maintains its reliability and resale value. The Sinotruk howo parts catalog includes a full range of transmission and chassis components engineered for maximum durability. For fleet managers and owner‑operators who demand the best, the genuine AZ2210040711 is the only responsible choice.
The AZ2210040711 ring is used across a wide range of Howo models: T7H, A7, and classic Howo‑7 series equipped with HW19710, HW19712, and HW25716 transmissions. Always verify the position and dimensions using the service manual; different gear positions may use different rings.
Each AZ2210040711 is individually wrapped in VCI paper to prevent rust. The packaging is clearly labelled with the OEM number and batch code. For bulk orders, rings are shipped in sealed cartons with foam inserts to avoid transit damage.
Production of the AZ2210040711 takes place in IATF 16949 certified facilities, using CNC turning and grinding with in‑process gauging. Statistical process control ensures that dimensional variations are kept to a minimum, far exceeding the requirements of the original design. Every batch is accompanied by a material certificate and hardness test report, guaranteeing that the rings delivered are identical to those fitted on new Howo trucks at the factory.
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