The Sitrak Main Reduction Gear Housing Assembly (Rear Axle) (Anyang Tianrui) is a foundational and critical structural component for Sinotruk Sitrak heavy-duty truck axles, specifically sourced from the reputable Anyang Tianrui manufacturer. As a leading provider of genuine Sinotruk Sitrak parts, we offer this high-quality assembly to ensure the structural integrity, precise alignment, and long-term durability of your vehicle’s final drive system. This housing serves as the central chassis for mounting the crown wheel, pinion, differential, and associated bearings.
Sitrak Main Reduction Gear Housing Assembly (Rear Axle) (Anyang Tianrui)
The Sitrak Main Reduction Gear Housing Assembly (Rear Axle) (Anyang Tianrui) is the primary cast iron or steel enclosure that forms the core of the truck’s rear axle final drive. It is not merely a cover but a precision-machined structural member designed to accurately locate and support all the rotating elements of the main reduction gear set and differential. Manufactured by Anyang Tianrui, a trusted OEM supplier, this housing ensures the original equipment quality and specifications are met. Its internal bores and mounting faces are machined to exacting tolerances to ensure the correct alignment of the pinion bearing assembly, differential bearing caps, and the crown wheel, which is critical for setting proper gear backlash and bearing preload.
This assembly acts as the central load-bearing structure, transferring the reaction forces from the gears directly to the axle housing and the truck’s chassis. It must resist bending and twisting under high torque loads to maintain gear alignment. The design includes strategic ribbing and wall thickness variations to provide maximum strength while managing weight. The housing also features precisely drilled and tapped holes for mounting the differential carrier, bearing caps, and various accessories. Its sealing surfaces are machined smooth to ensure a perfect seal with gaskets, preventing lubricant leaks and contamination ingress, which are vital for the longevity of the internal gears and bearings.
Within the Sinotruk MAT16 and similar axle systems, the Main Reduction Gear Housing Assembly provides the mounting interface for the entire final drive unit to the axle banjo or carrier. Its geometry dictates the position of the pinion axis relative to the crown wheel axis, a relationship critical for achieving a proper hypoid gear contact pattern. The housing from Anyang Tianrui is supplied as a complete assembly, often including critical attached components like the differential bearing caps, alignment dowels (cylindrical pins), and mounting studs, ensuring all parts are matched and machined as a cohesive unit for simplified and accurate installation.
Replacing a damaged or worn main reduction gear housing is a major repair. Using a genuine Sitrak Main Reduction Gear Housing Assembly (Rear Axle) (Anyang Tianrui) guarantees that the replacement will restore the axle’s original geometry and performance characteristics. It eliminates the risks associated with welding or repairing a cracked housing, which can lead to distortion and subsequent gear failure. For workshops and fleet managers, installing this complete, ready-to-fit assembly is the most reliable and time-efficient method to repair an axle suffering from housing damage, severe bearing fretting, or chronic oil leaks from worn sealing surfaces.
| No. | Part Number | Part Name English | Quantity |
|---|---|---|---|
| 1 | WG7121325097/1 | Main Reduction Gear Housing (Rear Axle) (Anyang Tianrui) | 1 |
| 2 | WG9012320002 | Differential Bearing Cap | 2 |
| 3 | Q5210820 | Cylindrical Pin | 4 |
| 4 | Q12316120 | Double-ended Stud | 4 |
| 5 | 190003888459 | Self-locking Nut | 4 |
Genuine Anyang Tianrui OEM Quality: We supply the authentic Sitrak Main Reduction Gear Housing Assembly (Rear Axle) manufactured by Anyang Tianrui, a certified and trusted original equipment supplier for Sinotruk. This guarantees that the material composition, casting integrity, and machining specifications are identical to the part installed on the production line. Choosing our assembly ensures perfect compatibility with all other axle components, eliminating fitment issues and guaranteeing the structural performance and durability intended by Sinotruk’s engineers. You receive the same quality used in building new trucks.
Precision Machining for Critical Alignment: The paramount importance of this housing lies in its dimensional accuracy. Our housing assemblies undergo rigorous quality control to verify that all bearing bores, mounting faces, and dowel pin holes are machined within the strictest tolerances. This precision is non-negotiable for establishing correct gear alignment, which directly affects gear life, noise levels, and power transfer efficiency. By providing a housing with perfect geometry, we ensure that subsequent adjustments for bearing preload and gear backlash can be set accurately for a quiet, cool-running, and long-lasting final drive.
Complete & Ready-to-Install Assembly: We provide the Sitrak Main Reduction Gear Housing as a complete assembly, including essential ancillary parts like the differential bearing caps, cylindrical alignment pins, studs, and self-locking nuts. This kit format simplifies the procurement process for workshops, ensuring they have all the necessary matching components for a complete repair. It saves valuable time and prevents errors from sourcing individual parts from different suppliers, which may not be machined as a matched set. Our complete assembly streamlines the repair, reducing vehicle downtime.
Durability Assurance & Cost-Effective Solution: Investing in a new, high-quality housing assembly from a reputable source like Anyang Tianrui is ultimately more cost-effective than attempting to repair a damaged one. Repair welds can create stress points and distortions. Our new housing restores the axle to its original “as-new” condition, providing a reliable foundation that will last for the vehicle’s remaining service life. This prevents recurring problems like bearing failures or oil leaks, protecting your investment in other expensive internal gear components and avoiding future, more costly breakdowns.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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