Product Introduction

This heavy-duty compression spring is designed to provide consistent return force for the transmission’s shift control mechanism, ensuring reliable and precise gear changes.

• Structure & Material: Made from high-tensile steel wire, it features a tightly wound, uniform coil design. The surface is coated with a durable black oxide finish for excellent corrosion resistance.

• Performance: The spring is engineered to deliver a precise, linear force over its entire compression range, ensuring the shift linkage returns to its neutral position smoothly and consistently.

• Durability: The high-tensile steel construction resists fatigue and maintains its spring rate even after millions of cycles, ensuring long service life under harsh operating conditions.

Core Function

1. Return Force: Provides the necessary force to return the shift linkage to its neutral position after a gear change.

2. Shift Feel: Contributes to the tactile feedback and precision of the gear shift, improving driver confidence and control.

3. Vibration Damping: Absorbs minor vibrations in the shift linkage, preventing rattling and maintaining smooth operation.

Spring AZ2229250004 for SINOTRUK HW Series Gearbox – OEM-Quality Transmission Spring

When your SINOTRUK HW series gearbox demands reliable shifting performance, every internal component matters — especially the spring. The Spring AZ2229250004 is a precision-engineered transmission spring designed to maintain consistent pressure and smooth gear engagement inside SINOTRUK HW gearboxes. Built to OEM specifications, this gearbox spring ensures your heavy-duty trucks stay operational, reducing costly downtime and unexpected maintenance. Whether you are managing a fleet or stocking parts for resale, this SINOTRUK HW series gearbox spring delivers the durability and accuracy that professional operations require.

At Mettlead, we supply this spring directly from our factory in China, giving you access to competitive pricing without sacrificing quality. As a dedicated supplier of SINOTRUK, HOWO, SHACMAN, FAW, WEICHAI, DONGFENG, and FOTON truck parts, we understand the critical role each gearbox component plays in keeping heavy vehicles on the road.

Key Features and Benefits of Spring AZ2229250004

This SINOTRUK HW series gearbox spring is far more than a simple metal coil. It is a carefully manufactured component that directly affects your transmission’s shifting quality and longevity. Here is what sets it apart:

• OEM-Specification Design: Manufactured to match the original SINOTRUK part number AZ2229250004, ensuring perfect fitment and reliable performance in HW series gearboxes.
• High-Fatigue Resistance: Made from premium spring steel that withstands thousands of compression and decompression cycles without losing tension or deforming.
• Consistent Pressure Output: Delivers uniform force throughout its operational life, which translates into smooth and predictable gear shifting for drivers.
• Corrosion-Resistant Surface Treatment: The spring undergoes surface hardening and anti-corrosion processing, extending its service life even in harsh operating environments.
• Direct Factory Pricing: Because Mettlead sources directly from the production line, you benefit from wholesale pricing that improves your procurement margins.
• Strict Quality Control: Each batch is inspected for dimensional accuracy, hardness, and elasticity before shipping, so you receive parts that perform from day one.

In short, choosing the Spring AZ2229250004 from Mettlead means you are investing in a gearbox spring that performs identically to the original, backed by a supplier who understands heavy-truck transmission systems inside and out.

Technical Specifications – Spring AZ2229250004 SINOTRUK HW Series Gearbox

Application Scenarios – Where Does This Gearbox Spring Fit?

The Spring AZ2229250004 is specifically designed for the SINOTRUK HW series gearbox, which is one of the most widely used heavy-duty transmissions across global markets. Here is where this spring finds its application:

• Compatible Gearbox: SINOTRUK HW series manual transmission (HW15710, HW19710, and related models).
• Compatible Vehicles: SINOTRUK HOWO A7, HOWO T7H, SITRAK C7H, and other heavy-duty trucks equipped with HW gearboxes.
• Function: Serves as an internal return spring or detent spring within the gearbox assembly, maintaining proper gear engagement and preventing involuntary disengagement under load.
• Replacement Scenarios: Recommended during gearbox overhaul, when gear slipping occurs, or when routine inspection reveals worn or deformed springs.

If you are sourcing transmission parts for SINOTRUK heavy trucks, you can explore our complete range of SINOTRUK HOWO gearbox parts or browse all available gearbox components in our catalog.

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

Mettlead understands that different markets have different branding requirements. That is why we offer flexible OEM and ODM services for the Spring AZ2229250004 and our entire SINOTRUK parts catalog:

• White-Label Packaging: We can supply this gearbox spring under your own brand name with custom labels, making it easy for distributors to maintain brand consistency.
• Custom Packaging: Whether you need individual blister packs, bulk cartons, or branded boxes, our packaging team accommodates your specifications.
• Bulk Order Support: Large volume orders receive priority production scheduling and dedicated quality inspection, ensuring consistent delivery timelines.
• Technical Documentation: We can provide product datasheets and fitment guides under your brand for your downstream customers.

This flexibility makes Mettlead an ideal long-term partner for parts distributors, fleet maintenance companies, and aftermarket retailers looking to grow their SINOTRUK parts business. Visit our SINOTRUK HOWO truck parts brand page to see our full range of available products.

Customer Case Study – Spring AZ2229250004 in Action

A fleet management company based in East Africa reached out to Mettlead after experiencing repeated gear-slipping issues across their fleet of 45 SINOTRUK HOWO dump trucks. After diagnosing the problem, their workshop team determined that the internal gearbox springs had worn beyond tolerance due to extended service intervals.

They ordered 200 pieces of the Spring AZ2229250004 for SINOTRUK HW series gearbox from Mettlead. Our team shipped the order within 5 working days using their preferred freight forwarder. Once installed, the fleet reported smooth gear engagement restored across all repaired units, and the springs held up through the next 80,000 km service interval without any reported failures.

The client commented: “We tested springs from three different suppliers before choosing Mettlead. The AZ2229250004 springs matched OEM tension specs perfectly, and the pricing made it viable for us to stock them in bulk.”

This case highlights how sourcing the correct SINOTRUK HW gearbox spring from a reliable supplier directly impacts fleet uptime and maintenance costs.

Frequently Asked Questions – Spring AZ2229250004 SINOTRUK HW Gearbox

What is the function of Spring AZ2229250004 inside the SINOTRUK HW gearbox?

The Spring AZ2229250004 functions as a detent or return spring within the HW series gearbox assembly. Its primary job is to provide consistent pressure that holds gear selectors in position and ensures gears engage and disengage smoothly. Without a properly functioning spring, you may experience gear slipping, difficult shifting, or abnormal transmission noise.

How do I know if this gearbox spring needs replacement?

Common signs include difficulty shifting between gears, gears popping out of engagement under load, unusual metallic sounds from the gearbox housing, or visible deformation when the spring is inspected during a gearbox overhaul. If your SINOTRUK HW gearbox is being rebuilt, replacing all internal springs — including AZ2229250004 — is considered standard practice.

Is this Spring AZ2229250004 identical to the original SINOTRUK factory part?

Yes. This spring is manufactured to OEM-equivalent specifications, meaning it matches the original part in dimensions, material composition, hardness, and spring rate. It is designed as a direct drop-in replacement for the factory-installed spring in SINOTRUK HW series gearboxes.

What material is the Spring AZ2229250004 made from?

It is made from high-carbon spring steel, which is the standard material for automotive transmission springs. This material provides excellent fatigue resistance and maintains its elasticity over extended service periods, even under the high loads typical of heavy-duty truck gearboxes.

Can I order this gearbox spring with custom packaging or under my own brand?

Absolutely. Mettlead offers white-label and custom packaging services. You can have the Spring AZ2229250004 packaged with your logo, part numbering system, and branding. This is ideal for distributors and aftermarket retailers who sell SINOTRUK gearbox parts under their own labels.

What is the minimum order quantity for Spring AZ2229250004?

Minimum order quantities are flexible and depend on whether you need standard or custom packaging. For specific MOQ details and pricing tiers, please contact us directly with your requirements.

Ready to Source Spring AZ2229250004 for Your SINOTRUK HW Gearbox?

Getting the right gearbox spring at the right price should not be complicated. Mettlead offers factory-direct pricing, strict quality control, fast shipping, and flexible payment options for the Spring AZ2229250004 SINOTRUK HW series gearbox — all backed by years of experience supplying Chinese truck parts worldwide.

Take the next step today:

• Request a competitive quote with volume pricing.
• Ask about custom packaging and white-label options.
• Inquire about combined orders with other SINOTRUK gearbox parts to save on shipping.

Contact us now to get your quotation within 24 hours. Our team is ready to support your procurement needs with professional service and reliable delivery.