Product Introduction

This precision-machined gasket is a critical component for maintaining the correct alignment and preload of the sun gear in the planetary gearset.

• Structure & Material: Made from high-strength alloy steel, it features a thin, uniform circular profile. The surface is precision-ground for accuracy and coated with a black oxide finish for corrosion resistance.

• Performance: The precisely controlled thickness ensures accurate axial spacing, preventing excessive endplay or preload in the sun gear and bearings. Its flat, rigid surface evenly distributes axial loads.

• Durability: The hardened steel construction withstands high torque loads and friction, maintaining its shape and precision over time.

• Compatibility: Direct OE replacement, fully matching the dimensional specifications of the HW19710 transmission’s planetary gear system.

Core Function

1. Precision Spacing: Maintains the exact axial position of the sun gear, ensuring optimal meshing with planet gears and preventing premature wear.

2. Load Distribution: Evenly distributes axial loads across the sun gear and supporting bearings, extending their service life.

3. Alignment: Ensures perfect alignment of the sun gear within the planetary gearset, reducing noise and vibration.

Sun Gear Gasket (Rear) AZ2229100006 – SINOTRUK HW Series Gearbox Replacement Part

When your SINOTRUK HW series gearbox demands precision-fit components, settling for anything less than OEM-grade quality simply isn’t an option. The Sun Gear Gasket (Rear) AZ2229100006 plays a critical role in sealing the rear sun gear assembly, preventing oil leakage, and maintaining optimal transmission pressure within your heavy-duty gearbox system. At Mettlead, we supply this genuine-spec gasket directly from our factory line — meaning you get the exact dimensional accuracy your gearbox requires, without the inflated middleman pricing.

Whether you’re managing a fleet maintenance workshop in Africa, running a truck parts distribution business in Southeast Asia, or sourcing replacement components for mining vehicles in the Middle East, this rear sun gear gasket delivers the sealing integrity your SINOTRUK HW transmission needs to perform under demanding conditions.

Key Features and Benefits of Sun Gear Gasket (Rear) AZ2229100006

Understanding exactly what this gasket does — and why quality matters here — helps you make a confident sourcing decision. Let’s walk through the core advantages:

• Precision OEM Fitment: Manufactured to match the original SINOTRUK HW series gearbox specifications, this Sun Gear Gasket (Rear) AZ2229100006 drops right into place without any modification or shimming required.
• Superior Sealing Performance: The gasket material resists high-temperature transmission fluid and maintains its compression seal across thousands of operating hours, effectively preventing rear sun gear oil leakage.
• Heat and Pressure Resistance: Engineered to withstand the intense thermal cycling and hydraulic pressure generated inside HW series gearboxes during heavy hauling operations.
• Extended Service Life: Thanks to its high-density material composition, this gasket outlasts generic aftermarket alternatives, reducing your gearbox maintenance intervals and overall cost of ownership.
• Corrosion-Resistant Construction: The gasket surface treatment prevents chemical degradation from transmission oils and additives, ensuring long-term seal reliability.
• Cost-Effective Factory Direct Pricing: By sourcing directly from Mettlead’s production facility in China, you eliminate unnecessary import markups while still receiving a quality-inspected product.

In short, this isn’t just a gasket — it’s a precision seal component that protects your entire sun gear and planetary gear assembly from premature wear caused by fluid loss or contamination ingress.

Technical Specifications – Sun Gear Gasket (Rear) AZ2229100006

For technical engineers and procurement specialists who need precise data before ordering, here’s the complete specification breakdown:

Note: If you require a specific tolerance or material certification document, our technical team can provide detailed test reports upon request.

Application Scenario – Where Does This Sun Gear Gasket Fit?

The Sun Gear Gasket (Rear) AZ2229100006 is specifically designed for the rear sun gear position within SINOTRUK HW series gearboxes. Here’s a closer look at its real-world application:

Compatible Vehicles and Gearbox Models

• SINOTRUK HOWO A7 equipped with HW19710 transmission
• SINOTRUK HOWO T7H equipped with HW25716 transmission
• SINOTRUK SITRAK C7H with HW series manual gearbox
• SINOTRUK HOWO 371/375/380HP heavy-duty tractor heads
• SINOTRUK mining dump trucks utilizing HW series transmissions

This gasket seats at the rear of the sun gear inside the planetary gear section of the HW gearbox. Its primary function is to seal the interface between the sun gear shaft and the gearbox housing, preventing transmission fluid from bypassing the rear planetary assembly. Without a properly functioning gasket in this position, oil pressure drops — and eventually, gear tooth wear accelerates dramatically.

If you’re sourcing gearbox components for any of the above models, you can explore our full range of gearbox parts and SINOTRUK HOWO gearbox parts for a complete transmission rebuild solution.

OEM/ODM Capability – Customized Packaging and Branding

At Mettlead, we understand that distributors and wholesalers often need more than just the right part — you need it presented under your brand. That’s why we offer flexible OEM and ODM services for the Sun Gear Gasket (Rear) AZ2229100006 and across our entire SINOTRUK parts catalog:

• White-Label Packaging: Receive gaskets in neutral packaging, ready for your own label application or warehouse storage.
• Custom Branded Packaging: We can print your company logo, part numbers, and brand colors directly on the packaging — giving you a professional, retail-ready product.
• Strict Quality Control: Every batch undergoes dimensional inspection, material hardness testing, and visual quality checks before shipment.
• Flexible MOQ: Whether you need 50 pieces for a trial order or 5,000 for annual stock, our production line adapts to your volume requirements.
• Factory Visit Welcome: We encourage buyers to visit our facility in China for on-site quality audits, production line inspections, and face-to-face partnership discussions.

Explore the full range of SINOTRUK HOWO truck parts and spare parts available through our brand catalog.

Customer Case Study – Sun Gear Gasket AZ2229100006 in Action

Earlier this year, a fleet maintenance company based in Zambia reached out to Mettlead with an urgent request. They were managing over 60 SINOTRUK HOWO dump trucks working in copper mining operations, and transmission oil leakage had become a recurring problem across multiple units. After disassembly, their technicians traced the root cause to deteriorated Sun Gear Gasket (Rear) AZ2229100006 components in the HW19710 gearboxes.

The client initially sourced generic gaskets from a local market — but those replacements lasted barely two months before leaking again. Frustrated with repeat failures, they contacted us for genuine-spec alternatives.

We shipped 150 units of the Sun Gear Gasket (Rear) AZ2229100006 via air freight to Lusaka within 7 days. After installation, the client reported zero oil leakage across all repaired units over the following six months. The maintenance manager noted that “the Mettlead gaskets held compression significantly better than anything we sourced locally — clearly a different material grade.”

This case perfectly illustrates why precision matters in gearbox sealing components. A low-cost gasket that fails in 8 weeks actually costs far more than a quality-inspected part that lasts the full service interval.

Frequently Asked Questions – Sun Gear Gasket (Rear) AZ2229100006

What is the exact function of the Sun Gear Gasket (Rear) AZ2229100006 inside the HW gearbox?

This gasket acts as a precision seal between the rear sun gear component and the surrounding gearbox housing. Its job is to maintain proper oil pressure within the planetary gear section and prevent transmission fluid from leaking past the rear sun gear shaft. When this gasket wears out or becomes compressed beyond its effective limit, you’ll typically notice oil dripping from the rear gearbox section and eventually experience gear shifting difficulty due to pressure loss.

How do I know if my Sun Gear Gasket (Rear) needs replacement?

The most common signs include visible oil seepage near the rear section of the HW series gearbox, a gradual drop in transmission oil level without any external pipe leaks, and in more severe cases, harder gear engagement or grinding during shifts. If your technician finds oil residue around the planetary gear housing during a routine inspection, the rear sun gear gasket AZ2229100006 should be one of the first components checked.

Is this gasket compatible with all SINOTRUK HW gearbox variants?

Yes, the AZ2229100006 is a universal fit across the SINOTRUK HW series gearbox family, including HW15710, HW19710, and HW25716 models. However, if you’re working with an older or modified transmission, we recommend confirming the part number with your gearbox nameplate data before ordering.

What material is the Sun Gear Gasket (Rear) AZ2229100006 made from?

The gasket is manufactured from a high-density composite material specifically formulated to resist transmission oil degradation, high heat exposure (up to 150°C), and repeated compression cycles. Unlike cheap paper or cork gaskets, this material maintains its sealing properties over extended service periods without crumbling or hardening.

Can I order a small trial quantity before committing to bulk?

Absolutely. Mettlead supports flexible order quantities — whether you need 10 pieces for testing or 1,000 for warehouse stock. We also provide sample shipments so your engineering team can verify fitment and material quality before scaling up the order.

How should I store this gasket before installation?

Store the Sun Gear Gasket (Rear) AZ2229100006 in a cool, dry environment away from direct sunlight and chemical solvents. Avoid stacking heavy objects on top of the packaging, as excessive pre-compression can compromise the gasket’s sealing effectiveness once installed. Ideally, install within 24 months of manufacture for optimal material performance.

Ready to Source Your Sun Gear Gasket (Rear) AZ2229100006?

Don’t let a worn-out gasket shut down your fleet or delay your customer’s truck repairs. Mettlead delivers the Sun Gear Gasket (Rear) AZ2229100006 for SINOTRUK HW series gearboxes with factory-direct pricing, strict quality inspection, and fast international shipping to your door.

Whether you need a single piece for an urgent repair or bulk quantities for your parts distribution business, our team is ready to provide pricing, lead times, and technical support.

Get your quote today — Contact Us with your required quantity and delivery destination, and we’ll respond within 24 hours with a competitive offer.

Mettlead — Your Reliable Partner for SINOTRUK, HOWO, SHACMAN, FAW, WEICHAI, DONGFENG, and FOTON Truck Parts. Factory Direct. Quality Guaranteed. Globally Delivered.