Product Introduction

• Structure: A precision-machined assembly consisting of a high-strength 45# steel plug, an integrated copper sealing washer, and a hexagonal head for tool engagement. The plug features a full-threaded M30×1.5 profile, and the copper washer provides a reliable, reusable seal to prevent oil leakage. The surface undergoes a zinc-phosphate anti-corrosion coating to withstand transmission heat and road moisture.

• Performance: The fine-thread design ensures secure torque retention (recommended tightening torque: 80–90 N·m), preventing loosening under vehicle vibration. The copper washer deforms uniformly to create a metal-to-metal seal, resisting high-temperature transmission oil and maintaining a leak-free seal for over 10,000 hours of operation. The hexagonal head allows for easy removal and reinstallation during oil changes.

Core Function

1. Oil sump sealing: Seals the bottom of the transmission housing to retain lubricating oil and prevent leakage.

2. Maintenance oil draining: Provides a quick-access point for draining old transmission oil during routine maintenance.

3. Vibration-resistant retention: The fine thread and high-torque design prevent plug loosening under heavy vehicle vibration.

Oil Drain Plug Assy WG2203010002 – SINOTRUK HW Series Gearbox Drain Plug Assembly

When it comes to maintaining the health of a SINOTRUK HW series gearbox, every component matters — especially the one that controls your oil drainage. The Oil Drain Plug Assy WG2203010002 is a precision-engineered replacement part designed to deliver a leak-free, secure seal for heavy-duty transmission systems. Whether you’re restocking your warehouse or fulfilling fleet maintenance orders, this genuine-spec gearbox drain plug assembly ensures reliable performance under the toughest operating conditions.

At Mettlead, we supply this SINOTRUK HW gearbox oil drain plug directly from our factory in China — giving wholesale distributors and agents access to competitive pricing, consistent quality, and fast global shipping. If you’re looking for a dependable source for SINOTRUK gearbox parts, you’ve found the right partner.

Key Features and Benefits of Oil Drain Plug Assy WG2203010002

This isn’t just a simple plug — it’s a complete drain plug assembly built to OEM specifications for the SINOTRUK HW series gearbox. Here’s what makes it stand out for wholesale buyers:

• OEM-Grade Quality: Manufactured to match the original WG2203010002 specification, ensuring perfect fitment and seal integrity every single time.
• Leak-Proof Sealing: The assembly includes a precision-machined sealing surface and gasket components that prevent oil leakage even under high-temperature, high-vibration conditions.
• Durable Material Construction: Made from high-strength alloy steel with corrosion-resistant surface treatment, this drain plug assembly withstands years of repeated use and harsh environments.
• Easy Installation: Designed for straightforward removal and re-installation during routine gearbox oil changes, reducing workshop downtime significantly.
• Cost-Effective Wholesale Pricing: As a factory-direct supplier, Mettlead eliminates middlemen — translating into better margins for distributors and agents.
• Bulk Availability: We maintain steady inventory of WG2203010002 oil drain plug assemblies, so you can place large orders with confidence and short lead times.

Application Scenario – Where Does This Oil Drain Plug Fit?

The Oil Drain Plug Assy WG2203010002 is specifically designed for the SINOTRUK HW series gearbox — one of the most widely deployed heavy-duty transmission systems across global markets. Here’s exactly where it belongs:

• Compatible Gearbox: SINOTRUK HW series manual transmission (HW15710, HW19710, HW25716 and related models)
• Applicable Vehicles: SINOTRUK HOWO A7, HOWO T7H, SITRAK C7H, and other heavy trucks equipped with HW series gearboxes
• Function: Serves as the primary oil drain point on the gearbox housing, used during scheduled transmission oil replacement and maintenance procedures
• Service Environment: Mining operations, long-haul logistics, construction sites, and heavy transport fleets where regular gearbox maintenance is critical

In other words, anywhere a SINOTRUK HW gearbox is working hard, this drain plug assembly is doing its job — keeping the oil in until it’s time to let it out. For more compatible transmission components, browse our complete Gearbox Parts Collection and our dedicated SINOTRUK HOWO Gearbox Parts page.

Technical Specifications – WG2203010002 Oil Drain Plug Assembly

Accuracy matters when you’re sourcing parts for your customers. Below you’ll find the detailed parameters for this SINOTRUK gearbox oil drain plug assembly:

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

As a wholesale distributor or regional agent, your brand identity matters. That’s why Mettlead offers flexible OEM and ODM services for the Oil Drain Plug Assy WG2203010002 and our entire SINOTRUK parts catalog:

• White-Label Packaging: We can supply this gearbox drain plug in neutral packaging, ready for you to apply your own branding and labeling.
• Custom Packaging Design: Need branded boxes, part number labels, or multilingual packaging? Our team handles it all — just send your artwork.
• Strict Quality Control: Every WG2203010002 oil drain plug assembly undergoes dimensional inspection, material verification, and seal-tightness testing before shipment.
• Flexible Order Quantities: Whether you need a trial order of 50 pieces or a container load of 5,000+, we scale to meet your demand.
• Factory Audit Welcome: We openly invite agents and distributors to visit our facility in China for on-site inspection and quality verification.

Explore our full range of SINOTRUK replacement parts on our SINOTRUK HOWO Truck Parts brand page.

Customer Case Study – WG2203010002 Oil Drain Plug Bulk Order Success

Earlier this year, a heavy truck parts distributor based in East Africa reached out to Mettlead with a recurring problem: their previous supplier kept delivering Oil Drain Plug Assy WG2203010002 units with inconsistent thread quality, resulting in oil leaks and costly returns from their workshop clients.

After receiving a sample batch of our WG2203010002 SINOTRUK HW gearbox drain plug assemblies, they ran fitment tests across multiple HW19710 gearbox units. The results? Zero leakage, perfect thread engagement, and a surface finish that matched OEM standards. Within two months, they placed a standing monthly order of 300 pieces — and have since expanded their purchase list to include additional SINOTRUK HW series gearbox parts from our catalog.

Today, this client enjoys a 22% improvement in profit margins compared to their previous sourcing channel, thanks to Mettlead’s factory-direct pricing and reliable quality on every shipment of Oil Drain Plug Assy WG2203010002.

Frequently Asked Questions – Oil Drain Plug Assy WG2203010002

What exactly is the Oil Drain Plug Assy WG2203010002 used for?

This assembly serves as the main oil drainage point on the SINOTRUK HW series gearbox housing. It’s removed during scheduled transmission oil changes and then reinstalled to create a tight, leak-proof seal that keeps gear oil securely inside the transmission case during operation.

Is this WG2203010002 drain plug a direct replacement for the original part?

Absolutely. The Oil Drain Plug Assy WG2203010002 we supply is manufactured to OEM-equivalent dimensions, thread pitch, and material standards. It fits directly into the original mounting position on HW series gearboxes without any modifications required.

What causes a gearbox oil drain plug to fail or leak?

Over time, repeated removal and reinstallation can wear down the sealing surface and threads. Additionally, over-torquing, using the wrong gasket, or corrosion from harsh operating environments can compromise the seal. Replacing with a quality WG2203010002 oil drain plug assembly — complete with a fresh sealing washer — restores a factory-tight seal.

Does the WG2203010002 oil drain plug assembly include the sealing gasket?

Yes. This is a complete assembly (hence “Assy” in the part name), which means it comes with the integrated sealing washer or gasket needed for proper installation. You won’t need to source additional sealing components separately.

What is the recommended torque specification for installing this drain plug?

While specific torque values should always reference the official SINOTRUK workshop manual for your gearbox model, this type of drain plug typically requires a torque in the range of 30–50 Nm. Over-tightening can strip the threads on the gearbox housing, so using a calibrated torque wrench is strongly recommended.

Can I order the Oil Drain Plug Assy WG2203010002 with my own brand packaging?

Yes. Mettlead offers white-label and fully custom packaging for all SINOTRUK gearbox parts, including the WG2203010002 drain plug assembly. Simply provide your branding artwork and we’ll handle the rest — perfect for distributors building their own parts brand in local markets.

Ready to Source Oil Drain Plug Assy WG2203010002 at Wholesale Pricing?

Stop overpaying middlemen and start sourcing your SINOTRUK HW series gearbox oil drain plug assembly WG2203010002 directly from the factory. Mettlead delivers consistent quality, competitive pricing, and the flexible service that wholesale agents and distributors demand.

Here’s what to do next:

1. Send your inquiry — Tell us your required quantity, packaging preferences, and shipping destination.
2. Receive your quote — We’ll respond within 24 hours with pricing, lead time, and payment options.
3. Place your order — Enjoy factory-direct savings and reliable global delivery.

Get started now — Contact Us today to request your wholesale quote for Oil Drain Plug Assy WG2203010002 and explore our complete range of SINOTRUK HW gearbox spare parts.