The Sitrak Differential Housing (Shandong Runtong) is a vital, precision-engineered sub-assembly essential for the proper functioning of Sinotruk Sitrak truck differentials. As an authorized distributor of genuine Sinotruk Sitrak parts, we supply this critical component pair—comprising the left and right housings—manufactured to the highest standards by the reputable Shandong Runtong facility. The Sitrak differential housing serves as the secure, rigid enclosure for the differential gears, providing the mounting points for the side gears, planetary gears, and cross shaft while ensuring proper bearing alignment.
The Sitrak Differential Housing (Shandong Runtong) is a two-piece forged or cast steel assembly that forms the central rotating carrier for the differential gear set within the truck’s rear axle. Specifically manufactured by Shandong Runtong, a trusted OEM supplier, this housing consists of a left half and a right half that bolt together to create a secure chamber. Inside this chamber, the side gears (attached to the axle shafts) and the planetary gears (mounted on a cross shaft) are housed. The primary function of this housing is to provide a robust, dimensionally stable structure that maintains the precise alignment of these internal gears under the high torque loads generated by the engine and transmitted through the final drive.
Beyond just containment, the Sitrak differential housing is a critical load-bearing component. It features precisely machined bearing journals on its outer ends, which are supported by large tapered roller bearings within the main axle carrier. The accuracy of these bearing surfaces is paramount, as any imperfection can lead to misalignment, causing premature bearing failure, gear noise, and inefficient power transfer. The housing also has mounting flanges and bolt patterns that are engineered to match perfectly with the ring gear (crown wheel). When assembled, the ring gear is bolted to the housing, causing the entire differential assembly to rotate as a single unit, driven by the pinion gear.
During operation, the Sitrak Differential Housing (Shandong Runtong) enables the essential function of the differential: allowing the left and right drive wheels to rotate at different speeds when cornering. While the housing itself rotates with the ring gear, the internal gears can move relative to each other within it. The strength and integrity of the housing are tested every time torque is applied, especially in situations requiring high traction, such as starting on a slope or driving off-road. A failure here, such as a cracked housing or worn bearing journals, can lead to a complete loss of drive or catastrophic damage to the axle assembly.
Replacing the differential housing is a common repair procedure when internal components fail or the housing itself becomes damaged. The Shandong Runtong version is designed as a direct, bolt-on replacement that restores original equipment performance. It is typically sold as a matched set (left and right halves) to ensure perfect alignment and balance. Using this genuine assembly guarantees that all critical dimensions, material properties, and heat treatment specifications are correct, providing a reliable foundation for rebuilding the differential with new gears and bearings, ultimately extending the service life of the entire axle.
| No. | Part Number | Part Name English | Quantity |
|---|---|---|---|
| 1 | WG7121325168/1 | Differential Housing (Left) (Shandong Runtong) | 1 |
| 2 | WG9231320164/5 | Differential Housing (Right) (Shandong Runtong) | 1 |
Authentic Shandong Runtong OEM Quality: Our Sitrak Differential Housing is sourced directly from Shandong Runtong, a certified and reputable manufacturer within Sinotruk’s supply chain. This guarantees that the material composition, forging process, heat treatment, and final machining meet the exact original equipment specifications. You receive a component with the same metallurgical strength, dimensional accuracy, and surface finish as the housing installed at the factory. This ensures perfect compatibility with all other differential components, from bearings to gears, and provides the structural integrity required for reliable, long-term service.
Precision Machining for Critical Alignment: The bearing journals and ring gear mounting face on a differential housing must be machined with extreme precision to ensure concentricity and perpendicularity. Our Shandong Runtong housings undergo rigorous quality control, including checks for runout, bore diameter, and surface hardness. This attention to detail is crucial because even minor deviations can lead to improper gear mesh, excessive bearing wear, and driveline vibration. By choosing our housing, you are investing in a component that provides a perfectly true and stable foundation for the entire differential assembly, enabling optimal performance and longevity.
Matched Left & Right Set for Balanced Performance: We supply the Sitrak Differential Housing as a complete, matched set consisting of both the left and right halves. This is vital because the two halves are designed to work together as a single unit. Supplying them as a pair ensures they are from the same production batch, with consistent material properties and machining tolerances. This guarantees perfect alignment when bolted together, maintaining balance and preventing internal stress that could occur with mismatched halves. It simplifies the repair process for technicians and provides peace of mind that the assembly will function harmoniously.
Durability and Cost-Effective Drivetrain Protection: A differential housing failure often leads to catastrophic damage to expensive gears, bearings, and axle shafts. Choosing our high-quality Shandong Runtong housing is a proactive and cost-effective investment in protecting the entire drivetrain. Its robust construction resists cracking, bearing seat fretting, and thread damage. By restoring this core component to “like-new” condition, you prevent cascading failures, minimize the risk of unexpected roadside breakdowns, and extend the service intervals of your truck’s rear axle. This reliability translates directly into lower total cost of ownership and improved fleet uptime.
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