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The 31Q02-04080-A 5T/3.5 military rear wheel grease retainer is a genuine SINOTRUK HOWO component engineered to provide a reliable seal for wheel bearings in heavy‑duty military and commercial vehicles. As a critical element of the trusted Sinotruk howo parts family, this grease retainer prevents lubricant leakage and contaminants from entering the wheel hub, ensuring long bearing life and safe operation under extreme conditions. Manufactured from high‑grade nitrile rubber with a steel insert, the 31Q02-04080-A unit withstands high rotational speeds, temperature variations, and exposure to mud, water, and road salt. Its robust construction guarantees reliable sealing in mining, construction, and military applications. Investing in this authentic component maintains driveline integrity and reduces maintenance downtime.
5T/3.5 Military Rear Wheel Grease Retainer
Маслоудерживающее кольцо заднего колеса 5T/3.5 Military
Retén de grasa de rueda trasera 5T/3.5 Military
The 31Q02-04080-A grease retainer is precision‑molded from a high‑grade nitrile rubber (NBR) compound that offers exceptional resistance to mineral oils, greases, and extreme temperatures from -40°C to +120°C. The integrated steel insert provides structural rigidity and ensures the seal maintains its shape under high radial loads. The sealing lip is designed with a hydrodynamic profile that actively pumps grease back into the bearing area while excluding water, dust, and mud.
Each 31Q02-04080-A seal is 100% inspected for dimensional accuracy, lip condition, and material integrity. The seal is tested for leak‑free operation under simulated operating conditions, including high‑speed rotation and pressure variations. The garter spring maintains constant lip pressure, compensating for minor wear and ensuring long‑term sealing performance. This meticulous quality control guarantees reliable protection for wheel bearings in the most demanding military and off‑highway environments.
The table below provides detailed technical data for the genuine SINOTRUK HOWO 31Q02-04080-A rear wheel grease retainer. These specifications are essential for verifying compatibility.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | 31Q02-04080-A | SINOTRUK HOWO Original Code |
| Product Name | 5T/3.5 Military Rear Wheel Grease Retainer | Wheel hub oil seal |
| Material | NBR (Nitrile Butadiene Rubber) with steel insert | Oil & wear resistant |
| Inner Diameter (d) | 110 mm | ±0.2 mm |
| Outer Diameter (D) | 140 mm | ±0.3 mm |
| Width (B) | 14 mm | ±0.3 mm |
| Lip Material | NBR, spring‑loaded | Self‑adjusting |
| Hardness (Shore A) | 70 ±5 | Optimized for sealing |
| Temperature Range | -40°C to +120°C | Continuous operation |
| Max Shaft Speed | 2500 rpm | Suitable for highway speeds |
| Applicable Models | 5T / 3.5 ton military rear axles | Also commercial variants |
| Included Components | Seal only (garter spring integrated) | Check packaging |
The 31Q02-04080-A grease retainer is specifically designed for the rear wheel hubs of 5‑ton and 3.5‑ton military trucks produced by SINOTRUK, as well as heavy‑duty commercial vehicles with similar axle configurations. It is installed between the wheel bearing and the hub, retaining the grease inside the bearing cavity while preventing contamination from water, mud, and dust. This seal is essential for maintaining proper bearing lubrication in off‑road and combat environments where reliability is critical.
In chassis applications, the grease retainer is exposed to extreme axle articulation, high temperatures from braking, and corrosive elements. The genuine 31Q02-04080-A seal’s durable NBR compound and robust steel insert ensure that it maintains its sealing properties for thousands of kilometers, even under the most punishing conditions. It is also used in some civilian heavy‑duty trucks and trailers that share the same hub dimensions.
When replacing the grease retainer, always inspect the hub bore and spindle for scoring or wear. Lubricate the seal lip with grease before installation. Use a seal driver to press the seal squarely into the hub to prevent damage.
Correct installation of the 31Q02-04080-A grease retainer is critical to ensure a leak‑free seal and long bearing life. Follow these steps:
Remove the wheel hub and bearings. Clean the hub bore and spindle thoroughly. Inspect for burrs, nicks, or wear. Apply a light film of grease to the seal bore to ease installation.
Place the new seal on a driver tool that contacts the outer metal case only. Gently tap the seal into the hub until it seats against the internal shoulder. Ensure the seal is square and not tilted.
Pack bearings with grease, install them, and adjust preload. Rotate the hub to ensure the seal lip contacts the spindle evenly. Check for leaks after a short test drive.
A worn or damaged grease retainer can lead to bearing failure and wheel end damage. Common signs that replacement is needed include:
If any of these symptoms are observed, immediate replacement with a genuine 31Q02-04080-A retainer is recommended. Continuing to operate with a failed seal can result in bearing seizure and wheel loss.
The precision‑molded lip and spring maintain a constant seal, keeping grease in and contaminants out, extending bearing life.
High‑grade NBR and steel construction withstands extreme temperatures, road salts, and off‑road abuse for years of service.
Manufactured to original dimensions, the seal installs easily and guarantees leak‑free operation, reducing downtime and maintenance costs.
To maximize the service life of your 31Q02-04080-A grease retainer, follow these best practices:
By adhering to these guidelines, you ensure that the 31Q02-04080-A retainer performs optimally throughout its intended service interval.
Aftermarket grease retainers are often made from inferior rubber compounds that harden or crack prematurely, leading to leaks and bearing failure. The genuine 31Q02-04080-A is manufactured to the exact specifications of the original equipment, using premium NBR and precision‑molded lip profiles. Each seal is tested for lip pressure, material hardness, and dimensional accuracy, guaranteeing that it will perform exactly as the original part.
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 wheel end components engineered for maximum durability. For fleet managers and owner‑operators who demand the best, the genuine 31Q02-04080-A is the only responsible choice.
The 31Q02-04080-A grease retainer is used on SINOTRUK HOWO 5‑ton and 3.5‑ton military rear axles, as well as on certain commercial heavy‑duty trucks with the same hub dimensions. It may also be compatible with some ZF and Meritor axles used in off‑highway applications. Always verify the inner and outer diameters using the service manual.
Each 31Q02-04080-A is individually wrapped in protective paper to prevent contamination. The packaging is clearly labelled with the OEM number and batch code. For bulk orders, seals are shipped in sealed cartons with foam inserts to avoid transit damage.
Production of the 31Q02-04080-A takes place in IATF 16949 certified facilities, using precision injection molding and automated assembly. Statistical process control ensures that dimensional variations are kept to a minimum. Every batch is accompanied by a material certificate and functional test report, guaranteeing that the seals delivered are identical to those fitted on new Howo trucks at the factory.
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