When your heavy-duty fleet demands absolute reliability, the 1316304132 Main Shaft stands as the unyielding backbone of the gearbox. Designed explicitly for Howo/Sitrak truck parts ecosystems, this OEM-grade main shaft delivers fatigue resistance, precise spline engagement, and flawless power flow. Every kilometer, every payload – the Main Shaft ensures your Sinotruk powertrain operates with silent confidence and enduring strength.
The Main Shaft is more than a replacement part – it is a performance upgrade. Manufactured under strict Sinotruk quality protocols, this main shaft undergoes induction hardening and micro-alloy treatment. The result: a spline surface that resists wear, a core that absorbs shock loads, and a dimensional precision that mates perfectly with Howo gear clusters. Whether you operate in mining, construction, or long-haul logistics, the Main Shaft reduces downtime and extends transmission life beyond conventional standards.
The main shaft is forged from vacuum-degassed 20CrMnTi steel, then carburized to a case depth of 1.2–1.6 mm. This specific heat treatment yields a surface hardness of 58–62 HRC while retaining a tough, ductile core. The result is a shaft that resists pitting, spalling, and torsional fatigue – even under the shock loads of off-road haulage. Independent lab tests confirm that the Main Shaft withstands 10⁷ reverse-bending cycles without failure, outperforming aftermarket alternatives by 40%.
| Parameter | Specification | Value / Note |
|---|---|---|
| OEM Number | 1316304132 | Howo / Sitrak |
| Overall length | 482 mm | ±0.3 mm |
| Max. outer diameter | Φ78 mm | bearing journal |
| Spline teeth (input) | 21 / 32 / 28 | multi-start, 30° pressure angle |
| Material | 20CrMnTi | case hardened |
| Hardness (core) | 28–32 HRC | surface 58–62 HRC |
| Straightness tolerance | 0.02 mm | over 300 mm |
| Dynamic balancing | G6.3 | ISO 1940 |
| Weight | 14.2 kg | net, ±0.1 kg |
| Surface finish | Ra ≤ 0.8 µm | ground journals |
Howo A7, Howo T7H, Howo 6×4, 8×4, and 4×2 configurations. Direct fit for HW19710, HW20716, and HW25712 transmissions. The 1316304132 is the factory-specified replacement for all 2020–2026 Howo heavy trucks.
Sitrak C7H, Sitrak G7, Sitrak X6000, and all Sinotruk MC/MD gearbox series. The Main Shaft replaces original shafts seamlessly, with no modification required. It also fits the ZF 16S series when used with appropriate adapters.
With proper lubrication (GL-5 80W-90) and regular inspection, the 1316304132 main shaft delivers over 600,000 km of service in on-highway applications. For off-road use, we recommend visual check every 800 hours. The spline wear indicator (marked on the shaft) allows quick assessment – ensuring your 1316304132 remains at peak performance.
For maximum life of the 1316304132, we advise changing transmission fluid every 50,000 km or 1,000 hours. Use only API GL-5 or higher, with viscosity appropriate to ambient temperature. The 1316304132 is designed to work with both conventional and synthetic lubricants. During overhaul, inspect the pilot bearing and the thrust washer – these mating components directly affect the 1316304132 alignment. A misaligned shaft can reduce bearing life by 60%, so always torque the retaining nut to 450–500 N·m as per the workshop manual.
From the dusty roads of South America to the Siberian routes, the main shaft has earned its reputation as the workhorse of the Sinotruk powertrain. Its balanced design reduces vibration, while the optimised tooth profile minimises gear whine. When you order the 1316304132, you are not merely buying a steel bar – you are investing in operational continuity.
Every shaft is laser-engraved with the OEM number, production date, and batch code – full traceability back to the heat treatment furnace. This level of transparency is what separates authentic Howo/Sitrak parts from generic alternatives. The Main Shaft is produced in ISO 9001 and IATF 16949 certified facilities, ensuring consistent quality from batch to batch.
The main shaft is universally compatible with left-hand and right-hand drive configurations. Its symmetrical design (except for the thrust collar) means it can be installed in either orientation – a feature that reduces inventory complexity for workshops. Many fleet managers report that standardizing on the Main Shaft across their Howo and Sitrak fleets has cut their spare parts SKU count by 15%, while also improving first-time fix rates.
Availability of the Main Shaft is rarely an issue, as it is one of the most demanded transmission parts globally. However, we always recommend keeping one or two units in stock, especially for fleets operating in remote areas. The Main Shaft is a critical component – its sudden failure can immobilize a truck, leading to costly downtime and lost revenue. Proactive replacement of the Main Shaft at the 500,000 km mark is a common best practice among top-tier logistics companies.
When you purchase the Main Shaft from authorized channels, you receive the full technical support package, including installation torque specs, alignment procedures, and a warranty that covers manufacturing defects. The Main Shaft is backed by a 12-month / 100,000 km warranty, whichever comes first – a testament to its robust engineering and the confidence we place in this essential driveline component.
Keep your fleet moving with the main shaft – the component that transmission specialists trust. With stock available for both emergency repairs and scheduled overhauls, the Main Shaft ensures you never face unexpected standstills. Order the genuine Main Shaft and experience the difference that premium metallurgy and exacting German-engineered standards make.
Installation of the Main Shaft is straightforward for any competent mechanic, provided they have the correct pullers and bearing heaters. The shaft’s splines are marked with alignment dots to simplify gear meshing, and the Main Shaft comes pre-coated with an anti-seize compound on the spline tips. This attention to detail ensures that the Main Shaft can be installed quickly, reducing workshop labour hours by up to 20% compared to generic shafts that require fitment adjustments.
Over the past decade, the Main Shaft has become the benchmark for main shaft quality in the Sinotruk aftermarket. Independent reviews from fleet operators across Europe, Asia, and the Americas consistently rate the 1316304132 with 4.8/5 stars for durability and value. The Main Shaft is not just a part; it is a long-term partnership with your vehicle’s performance.
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