Product Introduction

• Structure: Precision monoblock forging from 20CrMnTi alloy steel, integrating the input shaft spline section, support journal, and 1st gear teeth into a single unit. The clutch end features 14-tooth heavy-duty external splines (φ50mm), the middle journal is precision-ground for matching with the front cylindrical roller bearing, and the 1st gear teeth are carburized, quenched, and precision-ground. This results in surface hardness HRC 58–62(anti-pitting/wear) and core hardness HRC 33–45 (anti-impact fracture).

• Performance: The monoblock design eliminates assembly gaps between the gear and shaft, ensuring high torsional rigidity for heavy-load operation. The hardened 1st gear surface resists wear during frequent starting and climbing, while the precision journal maintains shaft concentricity, reducing bearing wear and running noise.

Core Function

1. Heavy-load power input: Transmits engine torque from the heavy-duty clutch to the HW25712 12-speed transmission main box, serving as the only power input channel.

2. 1st gear torque multiplication: The integrated 1st gear meshes with the countershaft 1st gear, providing the highest torque ratio for starting and steep slope climbing of fully loaded heavy trucks.

3. Shaft positioning & support: The precision journal matches the front cylindrical roller bearing, maintaining input shaft coaxiality during high-speed rotation and avoiding radial runout.

Input-1st Shaft Gear AZ2203020206 – SINOTRUK HW Series Gearbox Parts

Premium Input-1st Shaft Gear AZ2203020206 for SINOTRUK HW Series Gearbox – Factory Direct Supply

When your customers need reliable transmission performance from their SINOTRUK heavy-duty trucks, every single gear inside that HW Series gearbox matters. The Input-1st Shaft Gear AZ2203020206 serves as the critical first-stage driving gear on the input shaft, transferring engine torque directly into the transmission assembly. Without a precisely manufactured input shaft gear, the entire drivetrain suffers from premature wear, noise, and eventual failure.

At Mettlead, we supply this essential SINOTRUK HW Series Gearbox component at competitive factory-direct pricing — designed specifically for wholesale distributors and aftermarket agents who demand consistent quality and profitable margins. Whether you are restocking your warehouse or fulfilling a large fleet order, our Input-1st Shaft Gear AZ2203020206 delivers the OEM-grade precision your business relies on.

Explore our full range of SINOTRUK HOWO Truck Parts or browse our dedicated Gearbox Parts Category and SINOTRUK HOWO Gearbox Parts pages for compatible components.

Key Features and Benefits of Input-1st Shaft Gear AZ2203020206

Engineered for Demanding Conditions

The Input-1st Shaft Gear AZ2203020206 is precision-forged and heat-treated to withstand the extreme torque loads that SINOTRUK HW Series transmissions encounter daily. From long-haul highway routes to rugged construction sites, this gear maintains its dimensional integrity shift after shift.

• OEM-Matching Specifications: Manufactured to meet or exceed original SINOTRUK dimensional tolerances, ensuring seamless drop-in fitment without modifications.
• Superior Material Composition: High-grade alloy steel with carburized and hardened tooth surfaces delivers exceptional wear resistance and extended service life.
• Precision Tooth Profile: CNC-machined gear teeth provide smooth meshing, reduced transmission noise, and efficient power transfer throughout the gear ratio range.
• Heat Treatment Process: Advanced carburizing and quenching produce a hardened outer layer while maintaining a tough, shock-absorbing core — critical for heavy-load applications.
• Corrosion Resistance: Surface treatment protects against oxidation during storage and transit, so your inventory stays shelf-ready longer.

Built for Wholesale Profitability

As a distributor, your margins depend on sourcing quality parts at the right price point. Here is how the Input-1st Shaft Gear AZ2203020206 from Mettlead supports your bottom line:

• Factory-Direct Pricing: We eliminate middlemen, passing significant cost savings directly to bulk buyers.
• Flexible MOQ Options: Whether you need 10 pieces or 1,000, we structure orders to match your market demand.
• Low Return Rate: Strict quality control at every production stage means fewer warranty claims and happier end customers.
• Custom Packaging Available: White-label and branded packaging options help you strengthen your own market presence.

Technical Specifications – Input-1st Shaft Gear AZ2203020206

Application Scenarios – Where Does Input-1st Shaft Gear AZ2203020206 Fit?

The Input-1st Shaft Gear AZ2203020206 is specifically engineered as the first-shaft driving gear for the SINOTRUK HW Series Gearbox. It sits on the input shaft and directly engages with the countershaft gear assembly, making it one of the most load-bearing components in the entire transmission.

Compatible Gearbox Models

• SINOTRUK HW19710 Transmission
• SINOTRUK HW19712 Transmission
• SINOTRUK HW15710 Transmission
• Other HW Series variants utilizing the AZ2203020206 configuration

Applicable Vehicle Models

• SINOTRUK HOWO A7 heavy-duty trucks
• SINOTRUK HOWO 6×4 / 8×4 tractor heads and dump trucks
• SITRAK C7H series equipped with HW gearbox
• Various SINOTRUK-based special vehicles and mining trucks

This gearbox part is a high-demand replacement item for fleets operating in Africa, the Middle East, Southeast Asia, and South America — regions where SINOTRUK trucks dominate the heavy transport market.

OEM/ODM Capabilities – Your Branding, Our Manufacturing

Mettlead understands that distributors often need more than just parts — they need a supply partner who supports their brand strategy. That is why we offer comprehensive OEM and ODM services for the Input-1st Shaft Gear AZ2203020206 and our entire gearbox parts catalog.

• White-Label Packaging: Receive parts in neutral boxes ready for your own labels, or let us print your brand directly on packaging.
• Custom Packaging Design: From box artwork to holographic security labels, we help you build trust with your downstream buyers.
• Strict Quality Control: Every batch undergoes dimensional inspection, hardness testing, and visual quality checks before shipment.
• Flexible Order Quantities: We accommodate trial orders for market testing as well as container-load shipments for established distributors.
• Factory Visits Welcome: We invite partners to visit our facilities in China, inspect production lines, and build long-term confidence in our supply chain.

Customer Case Study – Input-1st Shaft Gear AZ2203020206 in Action

In early 2024, a well-established truck parts distributor based in Lagos, Nigeria, reached out to Mettlead with an urgent requirement. Their fleet maintenance clients were experiencing premature failures with locally sourced input shaft gears for SINOTRUK HW Series transmissions. The substandard parts were lasting only 30,000–40,000 km before showing signs of tooth pitting and spalling.

After evaluating our Input-1st Shaft Gear AZ2203020206 samples, the distributor placed an initial order of 200 units. The result? Their end-user feedback confirmed that our gears consistently exceeded 120,000 km of service life under standard loading conditions — a three-fold improvement over their previous supplier.

Within six months, this partner scaled their orders to 500 units per quarter and expanded into three neighboring West African markets. The combination of competitive pricing on the Input-1st Shaft Gear AZ2203020206 and Mettlead’s white-label packaging allowed them to build a recognizable regional brand around SINOTRUK HW gearbox replacement parts.

Today, they remain one of our most active accounts for SINOTRUK HW Series Gearbox components — proof that quality sourcing translates directly into market growth.

Frequently Asked Questions – Input-1st Shaft Gear AZ2203020206

What exact function does the Input-1st Shaft Gear AZ2203020206 perform inside the gearbox?

The Input-1st Shaft Gear AZ2203020206 is the primary driving gear mounted on the input shaft (first shaft) of the SINOTRUK HW Series Gearbox. It directly receives rotational force from the engine through the clutch assembly and transfers that torque to the countershaft gears. Essentially, it is the first mechanical link between your engine’s power output and the rest of the transmission — making its precision and durability absolutely critical.

How can I verify that AZ2203020206 is the correct part number for my customer’s vehicle?

The most reliable method is to cross-reference the part number stamped on the original gear removed from the gearbox. Additionally, you can confirm compatibility by checking the gearbox model plate (typically HW19710, HW19712, or HW15710). If you are still uncertain, send us the gearbox nameplate photo and VIN number, and our technical team will confirm fitment within 24 hours.

What causes premature failure of the input shaft gear in HW Series transmissions?

Common causes include insufficient lubrication, contaminated gearbox oil, improper clutch adjustment causing shock loads, and — most frequently in the aftermarket — substandard replacement gears manufactured from inferior steel or with inadequate heat treatment. Our Input-1st Shaft Gear AZ2203020206 addresses this last issue directly through strict material selection and controlled carburizing processes.

What is the expected service life of this Input-1st Shaft Gear under normal conditions?

Under standard operating conditions with proper lubrication and maintenance, our Input-1st Shaft Gear AZ2203020206 is designed to match OEM service life expectations — typically exceeding 100,000 km before any measurable wear becomes a concern. Actual lifespan varies based on load conditions, driving habits, and maintenance practices.

Can I order a sample before committing to bulk quantities?

Absolutely. We encourage new partners to start with sample orders so they can inspect dimensions, material quality, and overall finish before scaling up. Sample lead times are typically 3–5 business days from our warehouse. Simply contact us with your requirements.

Do you supply other gearbox components that pair with AZ2203020206?

Yes. We carry a comprehensive inventory of SINOTRUK HW Series Gearbox parts including countershaft gears, synchronizer assemblies, bearings, output shaft components, shift forks, and housing gaskets. Ordering complementary parts together allows you to offer complete repair kits to your customers — and qualifies for volume pricing.

Ready to Source Input-1st Shaft Gear AZ2203020206 at Wholesale Pricing?

Whether you are a regional distributor expanding your SINOTRUK gearbox parts inventory or an import agent seeking a reliable factory-direct source in China, Mettlead is your go-to partner for the Input-1st Shaft Gear AZ2203020206 and hundreds of other HW Series transmission components.

Here is what happens when you reach out to us:

1. Tell us your requirements — part number, quantity, packaging preferences, and destination port.
2. Receive a detailed quotation — typically within 12 hours, including unit pricing, MOQ options, and estimated delivery timelines.
3. Approve samples or proceed to order — we offer flexible payment methods and secure international shipping.

Do not let gearbox downtime cost your customers money. Stock the parts they need, sourced from a supplier you can trust.

👉 Contact Mettlead Now to request your wholesale quote for Input-1st Shaft Gear AZ2203020206 – SINOTRUK HW Series Gearbox Parts.