Product Introduction

This precision-engineered pneumatic fitting is a critical link in the transmission’s air control system, ensuring reliable and leak-free air pressure delivery for gear shifts.

• Structure & Material: Made from corrosion-resistant brass with a nickel-plated finish, it features an external threaded male end for connection to the transmission and a female quick-connect port for air tubing.

• Performance: The nickel-plated brass construction provides excellent resistance to vibration and corrosion, ensuring a leak-free seal even under harsh operating conditions.

• Durability: The robust metal construction withstands high air pressure, vibration, and temperature fluctuations, ensuring long service life.

• Compatibility: Direct OE replacement, fully matching the thread size and connection specifications of the HW19710 transmission’s pneumatic system.

Core Function

1. Air Pressure Transfer: Delivers compressed air from the vehicle’s pneumatic system to the transmission’s shift cylinder.

2. Leak Prevention: Provides a secure, leak-free connection to maintain consistent air pressure for smooth gear shifts.

3. Vibration Resistance: The metal construction resists loosening from drivetrain vibration, ensuring a reliable connection.

Straight-Through WG2229250006 SINOTRUK HW Series Gearbox – Premium Countershaft for Heavy-Duty Transmission

When your SINOTRUK HW series gearbox demands a reliable straight-through shaft that keeps power flowing smoothly under extreme loads, the Straight-Through WG2229250006 delivers exactly that. Engineered to meet OEM specifications, this countershaft serves as the backbone of your transmission assembly — transferring torque efficiently while resisting fatigue, wear, and thermal stress. Whether you are maintaining a fleet of HOWO heavy trucks or stocking your parts warehouse for global distribution, this component ensures your gearbox operates at peak performance, shift after shift.

At Mettlead, we supply this genuine-spec straight-through shaft directly from our manufacturing base in China, which means you get factory-direct pricing without sacrificing quality. Explore our full range of SINOTRUK HOWO truck parts or browse our dedicated gearbox parts category and SINOTRUK HOWO gearbox parts page to find every component your transmission needs.

Key Features and Benefits of the Straight-Through WG2229250006

Choosing the right straight-through shaft is not just about fitment — it is about long-term reliability and reduced downtime. Here is why procurement managers across Africa, Southeast Asia, and the Middle East trust this part:

• Precise OEM Fitment: The WG2229250006 is manufactured to match original SINOTRUK HW series gearbox specifications, ensuring seamless installation without modification.
• Superior Material Composition: Forged from high-grade alloy steel, this straight-through shaft withstands continuous high-torque applications, minimizing fatigue cracking and premature failure.
• Heat-Treated Surface Hardness: Advanced carburizing and quenching processes provide a hardened outer layer while maintaining a tough, ductile core — the ideal combination for transmission components under cyclic stress.
• Extended Service Life: Thanks to precision grinding and tight dimensional tolerances, the shaft reduces vibration and noise inside the gearbox, which translates to longer bearing life and smoother gear engagement.
• Cost-Effective Fleet Maintenance: Factory-direct pricing from Mettlead means you invest less per unit, freeing up budget for other critical spare parts across your fleet.
• Strict Quality Control: Every batch undergoes dimensional inspection, hardness testing, and surface finish verification before shipping, so you receive parts that perform from day one.

Technical Specifications – Straight-Through WG2229250006

Application Scenarios – Where the WG2229250006 Straight-Through Fits

This straight-through shaft is specifically designed for the SINOTRUK HW series gearbox, one of the most widely deployed heavy-duty transmissions across Chinese-brand commercial vehicles. If you are working with any of the following applications, this part is your direct replacement:

• SINOTRUK HOWO A7 Heavy Trucks — Long-haul logistics, mining transport, and construction haulage equipped with HW19710 / HW19712 transmissions.
• SINOTRUK HOWO T7H Tractor Heads — Inter-city freight operations relying on smooth, consistent shifting under loaded conditions.
• SITRAK C7H Premium Trucks — Higher-spec models using HW gearbox variants that demand precision-manufactured internal components.
• Fleet Overhaul and Gearbox Rebuilds — Ideal for transmission rebuild workshops that service multiple HW-series gearboxes and need a reliable supply of countershafts.

In short, wherever a SINOTRUK HW series gearbox is doing the heavy lifting, the Straight-Through WG2229250006 keeps power moving from input to output with confidence.

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

Mettlead understands that different markets have different branding requirements. That is why we offer flexible packaging and labeling options for the WG2229250006 straight-through shaft:

• White-Label Packaging: Receive parts in neutral boxes — perfect for distributors who sell under their own brand name.
• Custom Packaging: Add your company logo, part numbers, and branding to the outer packaging for a professional, market-ready presentation.
• Bulk / Export Packaging: Reinforced wooden crates and palletized shipping for large-volume orders heading overseas.
• Strict Quality Control at Every Stage: From raw material inspection through CNC machining, heat treatment, and final dimensional checks, we ensure consistency across every production batch.

Whether you need 10 pieces or 10,000, our production line scales to meet your demand without compromising on lead time or quality.

Customer Case Study – WG2229250006 Straight-Through Shaft for East African Fleet

Earlier this year, a fleet management company based in Kenya reached out to Mettlead with an urgent requirement. They operated over 200 SINOTRUK HOWO trucks across East Africa, and recurring gearbox failures were driving up maintenance costs and causing costly delivery delays. After an initial inspection, their workshop team identified the Straight-Through WG2229250006 as the most frequently replaced component in their HW series gearbox rebuilds.

The client’s procurement manager needed a supplier who could deliver consistent quality at a competitive price — and do so repeatedly over multiple orders. After receiving samples and running a pilot test on 15 trucks for three months, the results spoke for themselves: zero premature shaft failures, noticeably smoother shifting, and a 22% reduction in per-unit maintenance costs compared to their previous third-party supplier.

Today, that same fleet operator places quarterly bulk orders for the Straight-Through WG2229250006 SINOTRUK HW Series Gearbox shaft, along with other gearbox internals from our SINOTRUK HOWO gearbox parts catalog. Their feedback? “Mettlead gives us factory-quality parts with none of the guesswork. Our trucks stay on the road, and our clients stay happy.”

Frequently Asked Questions – Straight-Through WG2229250006

What exactly is the Straight-Through WG2229250006, and what role does it play inside the gearbox?

The WG2229250006 is a straight-through shaft (also called a countershaft or through shaft) that sits within the SINOTRUK HW series gearbox. Its job is to transmit rotational power between gear sets, enabling smooth and accurate gear engagement. Think of it as the central spine of your transmission — without a properly functioning straight-through shaft, gear shifting becomes rough, noisy, and ultimately damaging to other internal components.

Which specific gearbox models does the WG2229250006 fit?

This part is designed for the SINOTRUK HW series transmission family, including models such as HW19710, HW19712, and related variants. These gearboxes are commonly found in HOWO A7, HOWO T7H, and SITRAK C7H trucks. However, because SINOTRUK uses the HW platform across many vehicle lines, we always recommend confirming your exact gearbox model number before ordering.

How can I verify that this straight-through shaft matches OEM quality?

Every WG2229250006 shaft from Mettlead is manufactured to OEM dimensional specifications and undergoes a multi-stage quality control process. This includes raw material chemical analysis, CNC machining precision checks, heat treatment validation (surface and core hardness testing), and final dimensional inspection using calibrated instruments. We can provide inspection reports upon request.

What causes a straight-through shaft to fail, and how do I know when to replace it?

Common failure causes include insufficient lubrication, contaminated gearbox oil, overloading beyond rated capacity, and accumulated fatigue from high-mileage operation. Warning signs that the WG2229250006 needs replacement include unusual gearbox noise (grinding or whining), difficulty engaging specific gears, vibration during acceleration, and metal particles found in the transmission oil during routine servicing.

Can I order just one piece, or is there a minimum order quantity?

Mettlead offers flexible MOQs to accommodate both small repair shops and large-volume distributors. Whether you need a single replacement shaft or hundreds for your warehouse, we can arrange a solution. Simply contact us with your required quantity and we will provide a tailored quote.

How should I store the WG2229250006 shaft to prevent corrosion before installation?

We recommend keeping the shaft in its original packaging and storing it in a cool, dry environment away from direct moisture or chemical exposure. Each shaft ships with a rust-preventive oil coating, but prolonged exposure to humid conditions can still cause surface oxidation. If storage exceeds six months, apply a light layer of anti-rust oil to the machined surfaces as a precaution.

Ready to Source the Straight-Through WG2229250006? Let’s Talk.

Downtime costs money — and the faster you secure quality gearbox components, the faster your trucks get back to work. Mettlead makes sourcing the Straight-Through WG2229250006 SINOTRUK HW Series Gearbox shaft simple, affordable, and risk-free.

Here is what you can expect when you work with us:

• Factory-direct pricing with no middlemen
• Fast, reliable global shipping to your port or warehouse
• Flexible payment methods with secure transaction processing
• Dedicated support from our parts specialists who understand HW series transmissions
• Open invitation to visit our facility in China for inspection and sourcing trips

Get your quote today. Contact us now with your part number, required quantity, and destination — our team will respond within 24 hours with pricing, lead time, and shipping options. Your fleet deserves parts that perform, and Mettlead delivers exactly that.