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The WG2210040140 main shaft is a genuine SINOTRUK HOWO component that forms the backbone of the transmission’s output section, transferring engine torque to the driveshaft with minimal power loss. As a critical element of the trusted Sinotruk howo parts family, this main shaft is manufactured from high‑grade alloy steel, precision‑ground and heat‑treated to withstand the extreme torsional loads and fatigue encountered in heavy‑duty trucks. The WG2210040140 features accurately machined splines and bearing journals that ensure perfect alignment with gears, synchronizers, and clutches, delivering smooth and reliable power delivery in Howo chassis applications. Investing in this authentic component guarantees transmission durability, reduced vibration, and long‑term performance under the most demanding operating conditions.
Main Shaft
Главный вал
Eje principal
The WG2210040140 main shaft is forged from vacuum‑degassed 20MnCr5 alloy steel, ensuring a clean, inclusion‑free microstructure. After precision machining, it undergoes case‑carburizing to achieve a surface hardness of 58‑62 HRC with a tough, ductile core. This heat treatment provides exceptional resistance to wear, pitting, and torsional fatigue, allowing the shaft to handle the high torque outputs of Howo diesel engines. The splines are hobbed and shaved to DIN 5480 standards, guaranteeing accurate engagement with mating gears.
The bearing journals are ground to a tolerance of IT6 and super‑finished to a surface roughness of Ra 0.2 µm, reducing friction and ensuring optimal oil film formation. Each WG2210040140 shaft is 100% inspected for dimensional accuracy, runout, and crack detection using magnetic particle testing. The result is a main shaft that guarantees quiet operation, minimal vibration, and extended transmission life, even under continuous heavy loads.
The table below provides detailed technical data for the genuine SINOTRUK HOWO WG2210040140 main shaft. These specifications are essential for verifying compatibility and understanding its performance capabilities.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | WG2210040140 | SINOTRUK HOWO Original Code |
| Product Name | Main Shaft (Output Shaft) | For manual transmission |
| Material | 20MnCr5 alloy steel (case‑carburized) | High fatigue strength |
| Surface Hardness | 58‑62 HRC (case) | Core hardness 30‑38 HRC |
| Overall Length | Approx. 620 mm | Varies by transmission model |
| Spline Type | Involute, DIN 5480 | Module 2.5, 34 teeth |
| Bearing Journal Diameter | 55 mm / 60 mm | Precision ground |
| Runout Tolerance | ≤ 0.03 mm | Ensures smooth rotation |
| Weight (approx.) | 14.2 kg | Robust construction |
| Applicable Transmissions | HW19710, HW19712, HW25716 | Verify with service manual |
| Included Components | Shaft only (gears & bearings sold separately) | Check packaging |
The WG2210040140 main shaft is a direct OEM replacement for the output shaft used in Howo 9‑speed and 16‑speed manual transmissions, including the popular HW19710, HW19712, and HW25716 series. It transmits power from the countershaft to the driveshaft through the selected gear, supporting the vehicle’s load and acceleration. In the chassis, the main shaft connects to the propeller shaft via a flange, transferring torque to the differential. Its precision‑machined splines ensure a tight, backlash‑free connection with the sliding gears, contributing to smooth shifting and reduced wear.
The WG2210040140 is engineered to withstand the high torsional loads and shock loads encountered in on‑ and off‑highway applications, such as mining, construction, and heavy haulage. Using a genuine main shaft ensures that the transmission operates quietly and efficiently, with minimal power loss. It is also compatible with various auxiliary drives (PTOs) that are mounted on the transmission, making it a versatile component in the Howo chassis ecosystem.
When replacing the main shaft, it is recommended to also replace all associated bearings, synchronizer rings, and seals. Always use genuine WG2210040140 shafts to maintain the transmission’s original performance and durability.
Correct installation of the WG2210040140 main shaft is critical to ensure transmission reliability and long service life. Follow these steps:
Clean the transmission housing thoroughly. Inspect all gears, bearings, and synchronizers for wear. Replace any damaged components. Ensure the new shaft is free of rust and protective oil is removed from journals.
Using appropriate tools, carefully slide the gears, spacers, and bearings onto the shaft in the correct sequence. Apply a thin film of assembly lubricant to the splines and journals. Install the shaft into the transmission case, ensuring alignment with the countershaft and bearings.
Torque all retaining nuts to specifications. Check endplay and gear backlash. Rotate the shaft to ensure smooth operation. Fill with recommended transmission oil before road testing.
A worn or damaged main shaft can lead to transmission noise, hard shifting, and eventual failure. Common signs of wear include:
If any of these conditions are observed during transmission overhaul, replacement with a genuine WG2210040140 main shaft is essential. Continuing to use a worn shaft can cause catastrophic transmission failure and unsafe vehicle operation.
To maximize the service life of your WG2210040140 main shaft, follow these best practices:
By adhering to these guidelines, you ensure that the WG2210040140 main shaft performs optimally throughout its intended service interval.
Aftermarket main shafts often use lower‑grade steel, inadequate heat treatment, and loose manufacturing tolerances, leading to premature spline wear, shaft twisting, or even breakage under load. The genuine WG2210040140 is manufactured to the exact specifications of the original equipment, using premium alloy steel and precision heat treatment that ensures consistent hardness depth and core toughness. Each shaft 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 WG2210040140 is the only responsible choice.
The WG2210040140 main shaft 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 shaft length (some variants exist for different ratios).
Each WG2210040140 is individually wrapped in VCI paper to prevent rust. The packaging is clearly labelled with the OEM number and batch code. For bulk orders, shafts are shipped in wooden crates with protective spacers to avoid transit damage.
Production of the WG2210040140 takes place in IATF 16949 certified facilities, using CNC turning and grinding centers 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 shafts delivered are identical to those fitted on new Howo trucks at the factory.
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