Product Introduction

This precision-cut paper washer is a cost-effective, reliable sealing component for the transmission’s small access covers.

• Structure & Material: Made from high-density, oil-resistant paper or composite material, it features a square profile with rounded corners and four precision-placed mounting holes.

• Performance: The dense paper material conforms to minor surface irregularities, creating a tight seal that prevents gear oil leakage and blocks the entry of dirt and moisture.

• Durability: The oil-resistant paper withstands prolonged exposure to transmission fluid and moderate temperatures, ensuring a long-lasting seal.

• Compatibility: Direct OE replacement, fully matching the dimensions and hole positions of the transmission’s small access covers.

Core Function

1. Leak Prevention: Creates a fluid-tight seal between the small access cover and the transmission housing, preventing gear oil loss.

2. Contamination Protection: Blocks dirt, dust, and moisture from entering the transmission, protecting internal components from wear and corrosion.

3. Easy Installation: The precise hole alignment ensures a perfect fit with the cover’s mounting bolts, facilitating quick and secure installation.

Small Cover Paper Washer WG2229210025 – SINOTRUK HW Series Gearbox Gasket

Genuine Small Cover Paper Washer WG2229210025 for SINOTRUK HW Series Gearbox

When it comes to keeping your SINOTRUK HW series gearbox sealed and running smoothly, the Small Cover Paper Washer WG2229210025 plays a quiet but critical role. This precision-cut gasket sits between the small cover and the gearbox housing, preventing oil leaks and contaminant ingress that can lead to costly transmission failures. At Mettlead, we supply this essential gearbox component at factory-direct pricing, making it easy for wholesale distributors and fleet operators around the world to maintain their heavy-duty trucks without breaking the budget.

Whether you are restocking your warehouse or sourcing parts for a large fleet overhaul, this paper washer delivers reliable sealing performance that meets OEM specifications. Moreover, our flexible order quantities and secure payment options mean you can scale your procurement with confidence.

Key Features and Benefits of WG2229210025 Paper Washer

Precision Sealing Performance

The Small Cover Paper Washer WG2229210025 is engineered to provide a tight, consistent seal on the SINOTRUK HW series gearbox small cover. Its fiber-based composition conforms to mating surfaces, compensating for minor imperfections and ensuring zero oil leakage even under high-temperature, high-vibration conditions.

OEM-Grade Material Quality

Manufactured from high-density sealing paper, this washer resists oil absorption, thermal degradation, and compression fatigue. As a result, it maintains its sealing integrity over extended service intervals, reducing the frequency of gearbox maintenance.

Wholesale-Friendly Pricing

Because Mettlead sources directly from certified factories in China, we eliminate middlemen and pass substantial cost savings to our distributors. Consequently, you enjoy healthier profit margins while offering competitive prices in your local market.

Fast and Reliable Global Delivery

Time is money in the parts business. That is why we maintain ready stock of high-demand items like the WG2229210025 paper washer and partner with trusted logistics providers to ensure your orders arrive on schedule, regardless of destination.

Technical Specifications – WG2229210025 Small Cover Paper Washer

Application Scenarios – Where Does WG2229210025 Fit?

The Small Cover Paper Washer WG2229210025 is specifically designed for the SINOTRUK HW series gearbox small cover. It serves as a sealing gasket in the following applications:

• SINOTRUK HOWO heavy-duty trucks equipped with HW15710 and HW19710 transmissions
• SINOTRUK SITRAK series vehicles utilizing HW series manual gearboxes
• SINOTRUK Mining dump trucks that rely on HW-type transmissions for high-torque operations
• Aftermarket gearbox rebuilds and overhaul kits for SINOTRUK fleet maintenance workshops

In each of these scenarios, the paper washer ensures that transmission fluid stays inside the gearbox where it belongs, protecting internal gears and bearings from premature wear. If you need a broader range of transmission components, feel free to explore our full Gearbox Parts Category and our dedicated SINOTRUK HOWO Gearbox Parts page for compatible items.

OEM/ODM Capability and Custom Packaging

As a professional China truck parts supplier, Mettlead understands that distributors have unique branding needs. That is why we offer flexible OEM and ODM services for the Small Cover Paper Washer WG2229210025 and thousands of other SINOTRUK gearbox components.

• White-Label Packaging: We can pack the WG2229210025 paper washer in neutral boxes, allowing you to apply your own branding and labels for a seamless customer experience.
• Custom Packaging Design: If you prefer a fully branded package, our team can produce custom-printed boxes and labels that align with your company identity.
• Strict Quality Control: Every batch of paper washers undergoes dimensional inspection, material hardness testing, and oil resistance verification before shipment. In other words, you receive parts that consistently meet your quality standards.
• Flexible MOQ: We work with both large-volume wholesalers and growing distributors. Simply let us know your target quantity, and we will provide a competitive quotation.

For more SINOTRUK and HOWO spare parts with OEM/ODM options, visit our SINOTRUK HOWO Truck Parts brand page.

Customer Case Study – WG2229210025 Bulk Order for East African Distributor

Earlier this year, a well-established truck parts distributor based in Tanzania approached Mettlead with a recurring gearbox oil leak problem reported by local fleet operators using SINOTRUK HOWO trucks. After diagnosing the issue, it became clear that the Small Cover Paper Washer WG2229210025 on these HW series gearboxes had deteriorated due to low-quality aftermarket replacements.

The distributor placed an initial trial order of 500 pieces of the WG2229210025 SINOTRUK HW Series Gearbox paper washer through Mettlead. Upon receiving the shipment, their technical team confirmed that the material thickness, surface finish, and dimensional accuracy matched OEM standards perfectly. Consequently, leakage complaints from their end customers dropped significantly within weeks.

Impressed by the product quality and our competitive factory-direct pricing, this partner has since placed three repeat orders totaling over 2,000 pieces. Furthermore, they expanded their product range to include additional SINOTRUK gearbox sealing components from our catalog. This case illustrates how sourcing genuine-quality WG2229210025 paper washers from a reliable supplier like Mettlead translates directly into customer satisfaction, repeat business, and stronger profit margins for distributors.

Frequently Asked Questions – Small Cover Paper Washer WG2229210025

What is the function of the Small Cover Paper Washer WG2229210025 in the SINOTRUK HW gearbox?

This paper washer acts as a static gasket between the small cover plate and the main gearbox housing. Its primary function is to create a reliable oil-tight seal that prevents transmission fluid from leaking out and keeps dust, moisture, and debris from entering. Without a properly functioning WG2229210025 paper washer, the gearbox is vulnerable to fluid loss and premature internal wear.

How do I know if the WG2229210025 paper washer needs replacement?

Common signs include visible oil seepage around the small cover area, a drop in gearbox oil level without obvious external damage, and oil stains on the underside of the vehicle beneath the transmission. Additionally, during routine gearbox maintenance or overhaul, it is best practice to replace all paper washers and gaskets, including WG2229210025, to ensure a fresh seal.

Is this paper washer compatible with all SINOTRUK HW series gearboxes?

Yes, the WG2229210025 Small Cover Paper Washer is designed to fit the standard small cover configuration across the SINOTRUK HW gearbox family, including HW15710, HW19710, and related variants commonly found in HOWO and SITRAK trucks. However, we always recommend verifying the part number against your specific gearbox model before ordering.

Can I use a generic gasket instead of the OEM-spec WG2229210025?

While generic gaskets may physically fit, they often lack the oil-resistant properties and precise dimensional tolerances of the OEM-spec WG2229210025 paper washer. Using an inferior substitute can result in premature failure, repeated leaks, and additional labor costs for re-service. For long-term reliability, investing in a quality replacement that matches original specifications is always the wiser choice.

What is the recommended installation procedure for this gearbox paper washer?

First, thoroughly clean both the small cover surface and the gearbox housing flange to remove old gasket residue and oil deposits. Then, place the new WG2229210025 paper washer dry—no sealant is typically required for paper gaskets on these gearboxes. Finally, reinstall the small cover bolts and torque them evenly to the manufacturer-specified value to ensure uniform compression across the washer surface.

Ready to Source WG2229210025 at Factory-Direct Pricing?

Stocking the right parts at the right price is what keeps your business competitive. At Mettlead, we make it simple to procure the Small Cover Paper Washer WG2229210025 for SINOTRUK HW Series Gearbox in bulk—with strict quality assurance, flexible packaging options, and reliable worldwide shipping.

Take the next step today:

• Tell us your required quantity and delivery destination
• Receive a competitive wholesale quotation within 24 hours
• Enjoy secure payment options and transparent order tracking

Contact Us Now to request your free quote on WG2229210025 and discover why distributors across Africa, the Middle East, Southeast Asia, and South America trust Mettlead as their go-to SINOTRUK parts supplier. We also welcome factory visits—come see our quality control process firsthand.