When tackling challenging terrain or slippery conditions, the ability to lock your differential is crucial for maintaining forward momentum. The 1228320105 Differential lock ring from HOWO is engineered to provide a positive, wear-resistant engagement that ensures both wheels receive equal torque, maximizing traction when you need it most. As an essential Howo/Sitrak truck parts component, this lock ring is manufactured from case-hardened alloy steel with precision-ground teeth that mesh perfectly with the differential side gear, delivering instant and reliable locking action. Its robust design withstands the high shock loads of off-road operation and heavy hauling, preventing premature wear and ensuring consistent performance. Whether you are rebuilding an axle or upgrading your drivetrain, the 1228320105 guarantees superior engagement, reduced slippage, and extended differential life – making it the top choice for workshops and fleet operators worldwide.
The 1228320105 Differential lock ring is the heart of your locking differential mechanism. It engages with the side gear to lock the axle shafts together, preventing wheel spin and ensuring that power is distributed equally. A worn or damaged lock ring can cause incomplete engagement, leading to chattering, premature wear of the locking mechanism, and eventual failure to lock. HOWO has engineered this ring with optimized tooth geometry that provides a large contact area, reducing stress concentration and distributing load evenly. The result is a smooth, positive lock that engages quickly and releases cleanly, giving you confidence in low-traction situations. Whether you are navigating mud, snow, or rocky trails, the 1228320105 keeps you moving forward.
Positive Lock
Instant Engagement
Hardened Teeth
Wear-Resistant
OEM Grade
Genuine HOWO
High Torque
Shock Load Ready
Precise engineering data ensures correct selection and installation. The 1228320105 is manufactured to stringent OEM dimensions, guaranteeing a seamless fit in your HOWO differential.
| Parameter | Specification | Detail |
|---|---|---|
| OEM Number | 1228320105 | Exact Match |
| Part Name | Differential lock ring | HOWO Genuine |
| Brand | HOWO | Original Equipment |
| Application | HOWO T7H / A7 / Heavy Trucks | Rear differential lock |
| Material | Case-hardened alloy steel | Surface hardness HRC 58-62 |
| Tooth Count | 12 (spline engagement) | Precision ground |
| Outer Diameter | 98 mm | Tolerance ±0.05 mm |
| Thickness | 15 mm | Parallel ground faces |
| Surface Treatment | Phosphated + oiled | Corrosion protection |
| Warranty | 12 Months | Manufacturer Guarantee |
The 1228320105 Differential lock ring is produced using a sophisticated manufacturing process that includes blanking, heat treatment, and precision grinding. The raw material is a high-grade alloy steel that is first forged to near-net shape, then carburized and quenched to achieve a hard, wear-resistant surface while maintaining a tough, ductile core. The teeth are then ground to exacting tolerances, ensuring a perfect match with the side gear splines. This results in a ring that engages smoothly without backlash and resists deformation under extreme torque.
The ring’s geometry incorporates a chamfered lead-in to facilitate alignment during engagement, reducing the chance of clashing and improving shift quality. The phosphated coating provides a base layer that retains lubricant, reducing friction and wear during initial break-in. Every 1228320105 is inspected for hardness, dimensional accuracy, and surface finish using advanced metrology equipment, guaranteeing a product that meets the highest quality standards. This meticulous engineering ensures that your differential lock system operates reliably, mile after mile.
The 1228320105 is specifically designed for HOWO heavy-duty trucks equipped with rear differential locking systems, commonly found in T7H, A7, and similar models with MC11/MC13 engines. It is a direct replacement for the original factory ring, used in the differential lock actuator assembly. Its spline count and pitch diameter match the side gear, ensuring a precise fit without modification.
This lock ring is also compatible with certain Sinotruk and other heavy commercial vehicles that use the same differential locking mechanism. To confirm fitment, always verify the OEM number on your existing ring. If it matches 1228320105, this component will integrate seamlessly. Keeping this ring in your spare parts inventory allows for rapid axle repairs during drivetrain overhauls, minimizing downtime and ensuring your fleet is always ready for tough conditions.
HOWO T7H
Primary Fitment
HOWO A7
Also Compatible
Rear Differential
Lock Mechanism
Direct Replacement
No Modification
Replacing a worn or damaged lock ring with the 1228320105 restores the full functionality of your differential lock. A fresh ring provides crisp engagement, eliminating the clunking and hesitation that often accompanies worn parts. This allows you to confidently activate the lock when needed, knowing that it will engage fully and hold under load, improving traction in mud, snow, or loose gravel.
The hardened teeth reduce wear on the mating side gear, extending the life of both components. The precise fit also minimizes axial play, reducing the risk of the lock ring disengaging unexpectedly. For fleet operators, this translates to fewer drivetrain failures, lower maintenance costs, and improved vehicle productivity. By investing in the 1228320105, you ensure that your HOWO truck is always ready to handle the toughest terrain.
Installing the 1228320105 Differential lock ring requires careful attention to detail. Begin by safely raising the vehicle and removing the differential cover. Drain the lubricant and clean the housing thoroughly. Remove the old lock ring by carefully prying it from the side gear, taking care not to damage the gear or the surrounding components.
Inspect the side gear splines for wear or damage. If they are worn, replace them as well. Clean the mounting area and apply a thin layer of differential oil to the new ring. Align the ring with the side gear splines and gently tap it into place using a soft-faced mallet, ensuring it seats fully and squarely. Reassemble the locking mechanism, adjust the clearance per the manufacturer’s specification, and refill with the correct grade of lubricant. After installation, test the lock engagement with the vehicle on a lift to confirm proper operation. With proper care, the 1228320105 will provide years of reliable service.
Pro Tip: Always replace the lock ring and side gear as a matched set if the ring shows significant wear. Mixing worn and new components can lead to accelerated wear and poor engagement. The 1228320105 is designed to work with OEM side gears for optimal performance.
Genuine HOWO components are engineered to the highest standards, and the 1228320105 Differential lock ring is no exception. Aftermarket rings often use inferior steel, inconsistent heat treatment, or inaccurate tooth profiles, leading to premature wear, noise, and even failure to lock. HOWO’s ring is manufactured using the same materials and processes as the original equipment, guaranteeing a perfect fit and reliable performance.
By choosing the 1228320105, you benefit from HOWO’s extensive testing, which includes durability trials under high torque and shock loading. This ensures that the ring can withstand the most demanding off-road and heavy-haul applications. Moreover, genuine parts are backed by a comprehensive warranty and supported by a global network, giving you confidence in your purchase.
OEM Certified
Factory Quality
Long Service
Extended Life
Global Standard
Trusted Worldwide
Q: Which axle types use the 1228320105?
A: It is used in HOWO rear axles with a locking differential, commonly found in T7H and A7 models.
Q: Can this ring be used in other brands?
A: It may fit other vehicles that use the same differential locking mechanism, but always verify the spline count and dimensions. For guaranteed fitment, use it in HOWO applications.
Q: How do I know if my lock ring needs replacing?
A: Symptoms include difficulty engaging the lock, grinding noises when locking, or the lock failing to hold under load. Inspect the ring for chipped teeth or excessive wear.
Q: Is the ring pre-lubricated?
A: It comes with a light oil coating for protection, but it should be installed with fresh differential oil as per the vehicle’s service manual.
Order your 1228320105 Differential lock ring today! Explore our complete range of genuine HOWO and Sinotruk drivetrain parts at Howo/Sitrak truck parts and keep your differential locking system in top condition.
The 1228320105 Differential lock ring from HOWO is a testament to precision engineering and robust materials. By choosing this genuine component, you ensure that your differential lock engages positively and reliably, giving you the traction you need in adverse conditions. Whether you are a professional mechanic or a fleet manager, this lock ring offers the durability and performance required for modern heavy-duty trucks. Trust HOWO – the benchmark for excellence in heavy-duty truck components – and experience the difference that genuine quality makes.
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