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The AZ2203020059 input shaft and first axle gear assembly is a genuine SINOTRUK HOWO component engineered to transmit engine torque into the transmission with maximum efficiency and durability. As a critical element of the trusted Sinotruk howo parts family, this assembly ensures smooth engagement and reliable power transfer from the clutch to the gearbox, even under the extreme shock loads of mining, construction, and long‑haul operations. Manufactured from case‑hardened alloy steel (20MnCr5) with precision‑ground splines and helical gears, the AZ2203020059 unit withstands high torsional stress and fatigue. Its robust construction guarantees long service life, reduced noise, and consistent performance, making it an essential component for maintaining driveline integrity in Howo heavy‑duty trucks.
Input Shaft And First Axle Gear Assembly
Первичный вал и шестерня ведущего моста в сборе
Conjunto de eje de entrada y engranaje del primer eje
The AZ2203020059 assembly integrates a precision‑ground input shaft and a helical first axle gear into a single unit, ensuring perfect alignment and concentricity. The shaft is forged from 20MnCr5 alloy steel and subjected to case‑carburizing, achieving a surface hardness of 58‑62 HRC with a tough, ductile core. The splines are hobbed and shaved to DIN 5480 standards, providing accurate engagement with the clutch disc and reducing backlash. The integral gear features profile‑ground teeth with optimized crowning to minimize noise and maximize load distribution.
Each AZ2203020059 assembly undergoes 100% dimensional inspection using CNC gear measuring centers. The shaft is checked for runout (≤0.02 mm), and the gear teeth are evaluated for profile, lead, and pitch errors to DIN 6 quality. Magnetic particle crack detection is performed on all critical surfaces. This rigorous quality assurance guarantees that the assembly will provide reliable, quiet operation and withstand the high torsional loads encountered in heavy‑duty truck transmissions.
The table below provides detailed technical data for the genuine SINOTRUK HOWO AZ2203020059 input shaft and first axle gear assembly. These specifications are essential for verifying compatibility.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | AZ2203020059 | SINOTRUK HOWO Original Code |
| Product Name | Input Shaft And First Axle Gear Assembly | Integrated unit for transmission |
| Material | 20MnCr5 alloy steel (case‑hardened) | DIN 17210 |
| Spline Type (input) | Involute, DIN 5480 | W45 x 2 x 24 x 9H |
| Spline Hardness | 58‑62 HRC (case) | Core 30‑38 HRC |
| Gear Type | Helical, constant mesh | First gear |
| Number of Teeth (gear) | 41 | Module 3.5 |
| Helix Angle | 22° (right‑hand) | Optimized for quiet operation |
| Tooth Quality | DIN 6 | Profile and lead tolerances |
| Overall Length | Approx. 380 mm | Varies by transmission model |
| Weight (approx.) | 9.8 kg | Robust construction |
| Applicable Transmissions | HW19710, HW19712, HW25716 | First gear position |
| Included Components | Shaft and gear (integral) | Bearings and synchros sold separately |
The AZ2203020059 input shaft and first axle gear assembly is a direct OEM replacement used in Howo 9‑speed and 16‑speed manual transmissions, including the HW19710, HW19712, and HW25716 series. It is located at the front of the transmission, directly coupled to the clutch disc, and engages with the countershaft drive gear to provide the first gear ratio. This assembly experiences the highest torque multiplication and shock loads, making its strength and precision critical for vehicle launch and low‑speed operation.
In heavy‑duty applications such as mining, logging, and over‑the‑road haulage, the input shaft must endure repeated clutch engagements and torsional vibrations. A worn or damaged AZ2203020059 assembly can cause clutch chatter, gear noise, and even transmission failure. By using the genuine SINOTRUK HOWO assembly, you ensure that the transmission maintains its original load capacity and shift quality, reducing downtime and operating costs. It is also compatible with various PTO configurations that draw power directly from the input shaft.
When replacing the input shaft assembly, always inspect the pilot bearing in the crankshaft and the clutch disc splines. Replace the clutch disc if worn. Use a new input shaft seal and lubricate the splines lightly before installation.
Correct installation of the AZ2203020059 assembly is essential to ensure proper transmission function and long service life. Follow these steps:
Clean the transmission housing thoroughly. Inspect the front bearing and countershaft gear for wear. Ensure the new assembly is free of rust and protective oil is removed from the splines.
Apply a thin film of assembly lube to the bearing journals. Carefully insert the shaft into the front bearing, ensuring the gear meshes correctly with the countershaft. Use a soft‑faced hammer if necessary, but avoid striking the gear teeth.
After installing the retaining nuts and locking tabs, rotate the shaft to ensure smooth operation with no binding. Measure the gear backlash and adjust if necessary. Fill with recommended transmission oil.
A worn input shaft can cause driveline vibration and gear damage. Common signs that replacement is needed include:
If any of these symptoms are observed, immediate replacement with a genuine AZ2203020059 assembly is recommended. Continuing to operate with a worn input shaft can lead to gear tooth breakage and catastrophic transmission failure.
The case‑hardened splines and precision‑ground gear teeth ensure reliable transfer of peak engine torque without slippage or fatigue.
By maintaining precise gear meshing and reducing wear, the genuine assembly delays overhauls and lowers total cost of ownership.
High‑precision tooth profiles and helical design minimize noise and vibration, improving driver comfort and reducing fatigue.
To maximize the service life of your AZ2203020059 input shaft assembly, follow these best practices:
By adhering to these guidelines, you ensure that the AZ2203020059 assembly performs optimally throughout its intended service interval.
Aftermarket input shafts often use lower‑grade steel with incorrect heat treatment, leading to spline wear, twisting, or even breakage under load. The genuine AZ2203020059 is manufactured to the exact specifications of the original equipment, using certified 20MnCr5 steel and precise case‑hardening. Each assembly is balanced and tested for runout, guaranteeing vibration‑free operation.
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 AZ2203020059 is the only responsible choice.
The AZ2203020059 input shaft assembly 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 transmission model and the number of spline teeth (typically 24) using the service manual.
Each AZ2203020059 is individually wrapped in VCI paper to prevent rust. The packaging is clearly labelled with the OEM number and batch code. For bulk orders, assemblies are shipped in sealed cartons with foam supports to avoid transit damage.
Production of the AZ2203020059 takes place in IATF 16949 certified facilities, using CNC hobbing, shaping, 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 assemblies delivered are identical to those fitted on new Howo trucks at the factory.
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