Product Introduction

• Structure: A double-lip rubber oil seal with a metal casing, consisting of a nitrile butadiene rubber (NBR) sealing lip and a cold-rolled steel (SPCC) outer sleeve. The primary lip features a spring-loaded design to maintain constant contact pressure with the input shaft, while the secondary lip acts as a dust barrier. The metal casing is coated with anti-rust zinc phosphate for corrosion resistance, and the rubber compound is formulated to withstand high-temperature transmission oil.

• Performance: The spring-loaded primary lip maintains consistent sealing pressure even as the shaft wears, preventing oil leakage for over 60,000 hours of operation. The NBR rubber compound resists swelling and degradation from high-temperature transmission oil, while the secondary lip blocks road dust and moisture from entering the gearbox. The rigid metal casing ensures a secure interference fit withthe transmission housing, preventing seal displacement under vibration.

Core Function

1. Oil leakage prevention: Seals the input shaft to retain transmission lubricating oil and prevent leaks onto the clutch or undercarriage.

2. Dust and moisture protection: The secondary lip blocks external contaminants from entering the gearbox, reducing internal component wear.

3. Vibration-resistant sealing: The spring-loaded design maintains constant lip pressure on the rotating shaft, ensuring a reliable seal even under vehicle vibration.

Oil Seal AZ9003071001 for SINOTRUK HW Series Gearbox – Factory Direct Supply

When your SINOTRUK HW series gearbox demands a reliable seal to keep transmission oil where it belongs, the Oil Seal AZ9003071001 delivers precision-engineered protection against leaks, contamination, and premature wear. Designed specifically for heavy-duty applications, this gearbox oil seal ensures smooth power transmission and extended service life — even under the most demanding operating conditions.

At Mettlead, we supply genuine-quality SINOTRUK gearbox parts directly from our China-based factory, giving procurement managers worldwide access to competitive pricing, fast delivery, and the complete range of SINOTRUK HOWO truck parts they need to keep fleets running.

Why This Oil Seal AZ9003071001 Outperforms Generic Alternatives

Not all oil seals are created equal. The AZ9003071001 is purpose-built for the SINOTRUK HW gearbox environment, where high torque loads, elevated temperatures, and constant vibration put ordinary seals to the test. Here is what sets this gearbox oil seal apart:

• Precision OEM Dimensions: Manufactured to match exact SINOTRUK factory specifications, ensuring a tight, gap-free fit within the HW series gearbox housing.
• High-Temperature Resistance: Premium rubber compound withstands sustained heat generated during heavy hauling cycles without hardening or cracking.
• Superior Sealing Lip Design: The dual-lip structure prevents lubricant escape while blocking dust, moisture, and road debris from entering the gearbox cavity.
• Extended Service Life: Engineered to resist wear from shaft rotation, reducing the frequency of replacement and lowering your total maintenance costs.
• Corrosion-Resistant Spring: The internal garter spring maintains consistent lip pressure against the shaft, even as operating conditions fluctuate.

In short, choosing the right oil seal protects not just the gearbox — it safeguards your entire drivetrain investment. A failed seal can lead to oil starvation, gear scoring, and eventually catastrophic transmission failure that costs far more than preventive replacement.

Technical Specifications – Oil Seal AZ9003071001

Every Oil Seal AZ9003071001 that leaves our facility passes through strict dimensional inspection and material hardness testing. We verify each batch to ensure consistent quality, so you never have to worry about fitment issues or early failure in the field.

Application Scenarios – Which Vehicles Use Oil Seal AZ9003071001?

The AZ9003071001 oil seal is specifically designed to fit the SINOTRUK HW series gearbox, one of the most widely deployed heavy-duty transmissions across global markets. If your fleet includes any of the following, this is the seal you need:

• SINOTRUK HOWO A7 heavy-duty trucks equipped with HW19710 / HW19712 gearbox
• SINOTRUK HOWO 371 / 375 / 380HP tractor heads and dump trucks
• SINOTRUK SITRAK C7H models using HW gearbox variants
• SHACMAN trucks retrofitted with SINOTRUK HW series transmissions
• Mining and construction vehicles operating with HW-series gearboxes in high-load environments

Whether your trucks haul cargo on African highways, navigate Middle Eastern construction sites, or serve Southeast Asian logistics routes, the HW gearbox oil seal AZ9003071001 is an essential maintenance component that keeps operations on schedule. Browse our full selection of gearbox parts and SINOTRUK HOWO gearbox parts to source everything you need from one supplier.

OEM/ODM Capability – Custom Packaging and White-Label Options

We understand that distributors and fleet operators have different branding requirements. That is why Mettlead offers flexible OEM and ODM services for the Oil Seal AZ9003071001 and our entire SINOTRUK parts catalog:

• White-Label Packaging: Your brand, your identity. We produce the same factory-quality oil seal and pack it under your private label, complete with custom logos, part number labeling, and barcode integration.
• Custom Packaging Sizes: Whether you need individual retail-ready boxes or bulk industrial packaging for workshop distribution, we accommodate your specifications.
• Quality Documentation: Every shipment includes inspection reports, material certificates, and packing lists — ready for your own quality verification process.
• Minimum Order Flexibility: We work with both large-volume importers and growing distributors. Our team will find a quantity arrangement that makes commercial sense for your market.

From production to packaging, our strict quality control system ensures every oil seal meets the same exacting standard — regardless of whether it carries our name or yours.

Customer Case Study – Oil Seal AZ9003071001 Bulk Supply for African Fleet Operator

Earlier this year, a fleet maintenance company managing over 200 SINOTRUK HOWO dump trucks in East Africa approached us with a recurring problem. Their trucks were experiencing frequent gearbox oil leaks, leading to unplanned downtime and expensive transmission repairs. After investigating, their technical team identified the Oil Seal AZ9003071001 as the component that needed consistent, high-quality replacement stock.

They had been sourcing from multiple local traders, but inconsistent quality meant some seals failed within weeks of installation. After switching to Mettlead as their dedicated supplier for SINOTRUK HW gearbox oil seals, the results spoke for themselves:

• Gearbox oil leak incidents dropped by over 70% within the first three months.
• Average seal service life increased from 8,000 km to well beyond 40,000 km.
• Bulk pricing from our factory-direct model reduced their per-unit cost by 35% compared to previous suppliers.
• Consolidated shipping of AZ9003071001 together with other SINOTRUK HOWO truck spare parts cut their logistics expenses significantly.

Today, this client reorders the Oil Seal AZ9003071001 quarterly and has expanded their purchasing to include clutch components, bearings, and gears from our SINOTRUK HOWO gearbox parts collection.

Frequently Asked Questions – Oil Seal AZ9003071001 SINOTRUK HW Gearbox

What is the exact function of Oil Seal AZ9003071001 in the HW gearbox?

The AZ9003071001 oil seal sits at the shaft opening of the SINOTRUK HW series gearbox. Its primary job is preventing transmission fluid from escaping along the rotating shaft while simultaneously keeping external contaminants — such as dust, water, and fine particles — from entering the gearbox interior. Without a properly functioning seal, lubricant loss leads to increased friction, overheating, and accelerated gear wear.

How can I tell if my Oil Seal AZ9003071001 needs replacement?

Several warning signs indicate a worn or failing gearbox oil seal. Look for visible oil drips or wet spots beneath the gearbox housing, a noticeable drop in transmission fluid level between service intervals, unusual noise from the gearbox during gear changes, or oil residue accumulating around the shaft area. If you notice any of these symptoms, replacing the AZ9003071001 seal promptly will prevent more costly internal gearbox damage.

Is this oil seal compatible with both HW19710 and HW19712 transmissions?

Yes. The Oil Seal AZ9003071001 is designed to fit across the SINOTRUK HW series gearbox family, including the commonly used HW19710 and HW19712 transmission models. However, we always recommend confirming the OEM part number against your specific gearbox assembly drawing before ordering in bulk. Our team can help you verify compatibility — simply contact us with your vehicle VIN or gearbox serial number.

What material is the Oil Seal AZ9003071001 made from, and why does it matter?

This seal is manufactured from NBR (Nitrile Butadiene Rubber) reinforced with a precision-stamped steel skeleton. NBR offers excellent resistance to petroleum-based transmission oils, maintains elasticity across a wide temperature range (-40°C to +120°C), and resists abrasion from shaft rotation. The steel skeleton provides structural rigidity so the seal maintains its shape under installation pressure and during operation.

Can I order Oil Seal AZ9003071001 with my own brand packaging?

Absolutely. Mettlead offers white-label and custom packaging services for all SINOTRUK gearbox parts, including the AZ9003071001 oil seal. You provide your brand design and labeling requirements, and we handle production and packaging to your exact specifications. This service is ideal for distributors building their own aftermarket parts brand in local markets.

What is the typical lead time for bulk orders of this gearbox oil seal?

For standard packaging, most orders ship within 3–7 business days from our warehouse. Custom-packaged or white-label orders generally require 10–15 business days depending on design approval and order volume. We maintain safety stock of the AZ9003071001 due to consistent demand, so urgent orders can often be accommodated. Reach out to our sales team for real-time stock availability.

Ready to Secure Your Supply of Oil Seal AZ9003071001?

Stop losing money to gearbox oil leaks and unreliable seal suppliers. Whether you need 100 pieces or 10,000, Mettlead delivers factory-direct pricing, verified quality, and responsive support that procurement professionals trust across more than 30 countries.

Here is your next step:

1. Tell us your required quantity and delivery destination.
2. Receive a detailed quotation within 24 hours — no obligation.
3. Approve the order, and we handle production, inspection, and logistics.

Contact us now to request your quote for Oil Seal AZ9003071001 and explore our complete catalog of gearbox components for SINOTRUK HW series transmissions. Factory visits are welcome — come see our quality control process firsthand.