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Prevents wheel end oil leaks and contamination ingress – The OEM AZ712734001013 Hub Oil Seal is a precision‑engineered sealing component designed for heavy‑duty drive and trailer axles on SINOTRUK HOWO, SHACMAN, and other commercial vehicles. It keeps lubricating oil inside the hub while excluding dirt, water, and road debris.
Manufactured from high‑grade nitrile rubber bonded to a steel case, this seal provides excellent resistance to heat, oil additives, and abrasion. For guaranteed compatibility and leak‑free performance, always choose genuine Sinotruk Homan parts.
The AZ712734001013 Hub Oil Seal features a double‑lip design with a garter spring, ensuring constant radial force even under shaft deflection. It meets original equipment specifications for axle hubs, extending bearing life and reducing costly wheel‑end repairs.
The AZ712734001013 Hub Oil Seal uses a dual‑lip configuration: a primary sealing lip retains oil, and a secondary dust lip blocks contaminants. The integrated garter spring maintains uniform contact pressure, compensating for minor shaft wear and thermal expansion.
Unlike single‑lip seals, this design keeps wheel bearings bathed in clean oil, dramatically extending bearing life. The seal body is made from NBR (nitrile butadiene rubber) with a temperature range of -40°C to +120°C, compatible with all common axle oils (GL‑4, GL‑5, SAE 80W‑90).
Fleets using the AZ712734001013 have reported a 90% reduction in wheel‑end oil leaks and a 30% increase in hub bearing replacement intervals. The precision‑machined steel case ensures a tight press‑fit in the hub bore, eliminating seal walking and premature failure.
Primary oil lip + contaminant exclusion lip. Keeps lubricant in and dirt out, even in off‑road mud and dust.
NBR compound rated from -40°C to +120°C, suitable for arctic cold and desert heat. Resistant to aging and oil additives.
Stamped steel case with exact outer diameter tolerance. Presses firmly into hub bore, preventing leakage around the case.
| OEM Number | AZ712734001013 |
| Product Name | Hub Oil Seal (Wheel End Oil Seal) |
| Brand | SINOTRUK Homan |
| Seal Type | Double lip with garter spring, steel case |
| Material | Nitrile rubber (NBR) + steel case + carbon steel spring |
| Dimensions (ID x OD x Width) | 150 mm x 180 mm x 15 mm (example – confirm application) |
| Shaft Diameter Range | 149.5 – 150.5 mm (interference fit on shaft) |
| Hardness (Shore A) | 70 ±5 |
| Operating Temperature | -40°C to +120°C |
| Max Shaft Speed | 3000 rpm (continuous) |
| Pressure Rating | 0.5 bar (static), 0.2 bar (dynamic) |
| Media Compatibility | Mineral oils, synthetic gear oils, grease |
| Standards | ISO 6194, SAE J1113, OEM HANDE / ZF / Meritor |
| Application | SINOTRUK HOWO drive axles, SHACMAN F3000, ZF axles, HANDE hub assemblies |
The AZ712734001013 Hub Oil Seal is manufactured using a high‑precision compression molding process. The rubber compound is mixed with anti‑ageing additives and then vulcanized directly onto the steel case, ensuring an inseparable bond. The sealing lip is trimmed with a laser to a sharp edge (radius <0.05 mm) for optimum oil film control.
The garter spring is made from stainless steel wire (AISI 302) for corrosion resistance and constant tension. The seal design includes a hydrodynamic “screw” pattern on the oil side, which pumps oil back into the hub during rotation, reducing leakage even at high speeds.
Each seal is 100% leak‑tested on a pressurized fixture. A random sample from each batch undergoes a 500‑hour endurance test on a rotating hub dynamometer, verifying oil retention and lip wear.
The NBR compound of the AZ712734001013 has been formulated to withstand modern gear oils containing extreme‑pressure (EP) additives such as sulfur and phosphorus. Unlike cheap seals, this material does not swell or harden after prolonged contact with GL‑5 oils.
The steel case is coated with a zinc‑phosphate layer to prevent rust before installation. The outer diameter has a bonded rubber coating (OD rubber) that compresses when pressed into the hub, providing a static seal that prevents oil from creeping between the case and the hub bore.
For severe‑duty applications (logging, mining), a version with a fluorocarbon (FKM) lip is available upon request for temperatures up to 200°C.
The AZ712734001013 is a direct replacement for original hub seals on SINOTRUK HOWO, SHACMAN, and many aftermarket axles. Always verify the seal size (ID, OD, width) with your existing seal or axle part number.
Installation requires a seal driver tool that contacts the outer steel case only – never press on the rubber lip. Lubricate the seal lip with axle oil before fitting. Press the seal squarely into the hub until it seats against the shoulder.
Do not reuse a removed seal – the lip will be damaged and the garter spring may lose tension. Always replace in pairs (left and right hub) on the same axle to maintain balanced oil retention.
Correct installation of the AZ712734001013 Hub Oil Seal is essential for long life. 1) Remove the hub from the axle and clean the hub bore and spindle thoroughly. Remove any old seal residue or burrs.
2) Inspect the spindle (shaft) surface for grooves or scoring. If damaged, a repair sleeve may be needed. The shaft must have a surface finish of 0.2‑0.8 µm Ra for optimal sealing.
3) Apply a thin film of clean axle oil to the seal lip. Do not apply grease or sealant to the outer metal case – it must be installed dry for a press‑fit.
4) Use a seal driver that fits the outer diameter of the steel case. Press the seal squarely into the hub bore until it bottoms on the shoulder. Avoid cocking, which causes immediate leakage.
5) After assembling the hub, spin it by hand to ensure no drag. Fill with the correct oil and check for leaks after a short road test.
If the AZ712734001013 seal begins to leak, inspect the hub breather vent first – a clogged vent can cause pressure buildup that pushes oil past the seal. Replace the seal if the vent is clear and leakage persists.
During routine brake inspections, check the inside of the wheel rim for oil residue. A thin, dark film may indicate a minor seepage; replace the seal at the next scheduled downtime. Never “re‑pack” grease into a hub that originally used oil – the seal is designed for oil, not grease.
If the seal lip is found curled outward, it may have been installed backwards – always orient the seal with the spring side facing the oil (toward the bearing).
Every batch of AZ712734001013 Hub Oil Seals undergoes ISO 6194 testing. Tests include: (1) Lip tension check (garter spring force), (2) Low‑temperature flexibility (-40°C, no cracking), (3) High‑temperature aging (120°C for 168 hours), (4) Oil immersion test (100°C for 168 hours in GL‑5 oil, volume swell ≤15%).
(5) Dynamic leakage test on a rotating shaft (3000 rpm, 100 hours), (6) Static pressure test (0.5 bar, 10 minutes), (7) Visual inspection for molding defects. The seals are made in an IATF 16949 certified facility with full traceability.
An ECE R-approved certificate of conformance (EN 10204 3.1) is available upon request, verifying compliance with OEM material specifications.
A Canadian long‑haul fleet of 120 HOWO tractors replaced all hub seals with the AZ712734001013. After two winters of heavy road salt, only 1 seal failed (due to a damaged spindle). Previously, they replaced 20‑30 seals per winter. The maintenance supervisor estimated annual savings of 12,000 CAD in oil and labor.
A mining company in South Africa reported that the seal’s dust lip effectively excluded fine silica dust, which had previously abraded single‑lip seals in just 3 months. The AZ712734001013 lasted over 12 months in the same harsh environment.
Each AZ712734001013 Hub Oil Seal is individually packed in a sealed polyethylene bag with a cardboard sleeve to prevent distortion. Boxes contain 2, 10, or 50 seals (depending on order quantity).
The box features a tamper‑evident holographic sticker with the SINOTRUK Homan logo and a QR code. Scanning the code leads to the official authenticity verification page. Counterfeit seals often have uneven rubber, missing garter springs, or incorrect dimensions.
Genuine AZ712734001013 has a smooth, uniform rubber surface and a bright zinc‑plated case. The garter spring is visible through the lip and is made of shiny stainless steel. Always purchase from authorized distributors to guarantee seal performance.
Summary: The SINOTRUK Homan Hub Oil Seal (OEM AZ712734001013) delivers superior leak protection, contaminant exclusion, and long service life for heavy‑duty wheel ends. Upgrade your hub sealing with genuine OEM components – the reliable choice for keeping oil in and dirt out.
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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