Genuine Sinotruk Crown and Pinion AZ9231320911 – Ultimate Power Transfer & Unbreakable Drive Axle Reliability
Precision‑Ground Hypoid Gears for Maximum Torque and Efficiency
The Sinotruk Crown and Pinion AZ9231320911 is a genuine OEM hypoid gear set, precision‑engineered to deliver superior torque transfer and smooth, quiet operation in the drive axles of Howo and Sinotruk heavy‑duty trucks. This AZ9231320911 crown and pinion set is manufactured from high‑alloy carburising steel, with each gear tooth profile ground to exacting tolerances for maximum contact pattern and minimal noise, vibration, and harshness (NVH).
The AZ9231320911 gear set features a hypoid design that positions the pinion below the centre of the crown wheel, allowing for a larger pinion diameter and stronger tooth roots. This results in increased torque capacity and longer service life, essential for the demanding haulage conditions across Nigeria. Trust the genuine Sinotruk AZ9231320911 to keep your drive axles performing at their peak, reducing downtime and total cost of ownership.
Crown and pinion
English
Главная пара
Russian
Par de corona y piñón
Spanish
Engineering Excellence Behind the AZ9231320911 Crown and Pinion
The AZ9231320911 crown and pinion set is the heart of your truck’s drive axle, converting rotational input from the propeller shaft into torque multiplication and directional change. The crown wheel (ring gear) and pinion are matched as a set, lapped together during manufacturing to ensure perfect tooth contact and optimal load distribution. The gears are made from low‑alloy steel that is carburised, quenched, and tempered to achieve a hard, wear‑resistant case while maintaining a tough, ductile core.
In a typical Howo or Sinotruk truck, the drive axle gears operate under extreme loads, high shock, and continuous high‑speed rotation. The AZ9231320911 hypoid design allows the pinion to be positioned below the crown wheel centre, increasing the pinion diameter and number of teeth in contact, which reduces tooth bending stress and improves load‑carrying capacity. The precision‑ground tooth surfaces provide a smooth finish that minimises friction and heat generation, extending oil life and reducing maintenance.
Nigerian roads, with their potholes, uneven surfaces, and heavy loads, subject axle gears to severe shock loading. The AZ9231320911 is designed to withstand these forces, with a fatigue strength that exceeds 1.5 million cycles under peak torque. Its advanced manufacturing process ensures that the backlash and preload are within factory specifications, eliminating the need for shimming and reducing installation time.
Technical Specifications – Crown and Pinion AZ9231320911
| Parameter | Specification |
|---|---|
| OEM Part Number | AZ9231320911 |
| Product Name | Crown and Pinion (hypoid gear set) |
| Brand | Sinotruk (Genuine OEM) |
| Material | Low‑alloy carburising steel (20CrMnTi / equivalent) |
| Gear Type | Hypoid (offset pinion) |
| Crown Wheel Diameter | 462 mm (nominal) |
| Number of Teeth (Crown) | 41 |
| Number of Teeth (Pinion) | 13 |
| Ratio | 3.154 : 1 |
| Offset (pinion below centre) | 32 mm |
| Surface Hardness (HRC) | 58 – 62 (case), 30 – 40 (core) |
| Tooth Profile | Gleason / Oerlikon (spiral bevel) |
| Lapping | Matched set, factory lapped |
| Preload Setting | Factory set, supplied with shims |
| Weight (set) | 18.5 kg |
| Compatible Axles | Sinotruk ST, Howo 13T, 16T drive axles |
| Replacement Interval | Inspect every 100,000 km; replace if pitting, chipping, or excessive backlash |
Why the Genuine Sinotruk AZ9231320911 Outperforms Aftermarket Gear Sets
Aftermarket crown and pinion sets often use inferior steel alloys, inconsistent heat treatment, and poor lapping, leading to premature tooth wear, pitting, and catastrophic failure. The AZ9231320911, however, is manufactured under strict quality control, with each gear set subjected to rigorous metallurgical inspection, hardness testing, and lapping verification. The tooth geometry is optimised for low noise and high efficiency, reducing oil temperatures and extending lubricant service life.
Furthermore, the AZ9231320911 is supplied as a matched set with the correct preload shims, eliminating the need for extensive setup and measurement during installation. This reduces workshop time and ensures that the bearing preload and gear backlash are within the manufacturer’s specifications, maximising the life of the differential and bearings. By choosing the genuine Sinotruk AZ9231320911, you ensure that your axle operates quietly, efficiently, and reliably, reducing costly breakdowns and improving driver satisfaction.
Superior Metallurgy for Extreme Loads
The carburising process used for the AZ9231320911 creates a deep, hard case that resists abrasive wear and scoring, while the tough core absorbs impact loads without fracturing. The gear teeth are shot‑peened to induce compressive stress, further enhancing fatigue strength and resistance to pitting. These advanced manufacturing techniques are essential for trucks operating at maximum gross vehicle weight on Nigeria’s rugged terrain.
Perfect Match for Howo and Sinotruk Axles
The AZ9231320911 is designed to fit the most common drive axle models used by Sinotruk and Howo, including the ST series and the Howo 13T and 16T axles. Its bolt pattern and mounting dimensions match the original components, making it a straightforward replacement during axle overhauls. Each set is supplied with the necessary adjustment shims and detailed installation instructions, ensuring a perfect setup every time.
Explore the full catalogue of genuine Howo Parts available for your fleet, including differential components, bearings, and axle seals. The AZ9231320911 crown and pinion set is a critical component for restoring axle performance and durability — and with Sinotruk’s original quality, you ensure maximum torque transfer and long service intervals.
Installation Best Practices for the AZ9231320911 Crown and Pinion
Professional installation of the AZ9231320911 is essential to achieve optimal gear contact and longevity. Begin by thoroughly cleaning the axle housing and inspecting the bearings and carrier for wear. Press the pinion bearings onto the pinion shaft using the supplied preload spacers, and set the pinion preload to the specified value using a torque wrench and dial indicator.
Install the crown wheel onto the differential carrier, torquing the bolts to the recommended setting (typically 180‑220 N·m). Place the carrier assembly into the housing and adjust the side bearings to achieve the correct backlash (typically 0.15‑0.25 mm) and contact pattern. Use the supplied shims to achieve the factory‑specified settings. For Nigerian workshops, keeping a AZ9231320911 set in stock allows for rapid axle rebuilding, minimising vehicle downtime and ensuring that trucks return to service with a smooth, quiet, and powerful driveline.
Built for Nigeria – Unyielding Performance on African Highways
Nigeria’s transport sector faces some of the most punishing operating conditions in the world — heavy loads, poor road surfaces, and extreme heat. The AZ9231320911 crown and pinion is engineered to withstand these challenges, providing reliable torque transfer that keeps trucks moving, even on the most demanding routes.
Moreover, the AZ9231320911 is compatible with the wide range of Sinotruk and Howo axles in service across Nigeria, making it a versatile and strategic spare part for fleet operators. By choosing genuine Sinotruk gear sets, you ensure that your axles maintain their efficiency, reduce noise, and lower overall maintenance costs.
Strengthen Your Drive Axle with the Genuine AZ9231320911
The AZ9231320911 crown and pinion set is a cornerstone of your truck’s drivetrain, directly influencing performance, fuel economy, and reliability. Its superior materials, precision lapping, and exact OEM fitment make it the only logical choice for professional axle rebuilds. By installing a genuine Sinotruk AZ9231320911, you ensure smooth, quiet, and efficient power delivery, extending the life of your differential and bearings while reducing total cost of ownership.
Never compromise on axle quality with inferior aftermarket gears. Insist on the genuine AZ9231320911 — the crown and pinion trusted by Nigeria’s leading fleet operators and workshops. With its proven durability and uncompromising quality, this gear set delivers the strength and reliability that keep your business on the move.
Genuine Sinotruk AZ9231320911 – Built for power, lapped for smoothness, engineered for longevity.
Packaging & Shipping
Every Howo part is carefully packaged and shipped to ensure it arrives in perfect condition, ready for installation. Our professional logistics process guarantees timely delivery across Nigeria.
Secure Packaging
Each Howo part is individually wrapped in protective materials and placed in reinforced cardboard boxes to prevent damage during transit.
Dedicated Transport
We use our own Sinotruk logistics fleet for reliable delivery, ensuring parts reach customers quickly and safely across all regions of Nigeria.
Quality Inspection
Before shipping, each part undergoes final quality checks and is clearly labeled with its OEM number for easy identification.
Nationwide Distribution
Our extensive distribution network covers all major cities and rural areas in Nigeria, ensuring prompt delivery to construction sites, workshops, and businesses.
Shipping Information for Nigerian Customers
• Standard Delivery: 3-5 business days to major cities (Lagos, Abuja, Port Harcourt, Kano)
• Express Delivery: 1-2 business days available for urgent orders
• Regional Coverage: We deliver to all 36 states including remote areas
• Tracking: All shipments include real-time tracking information
Upgrade Your Sinotruk Truck Today with Howo parts!
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