Product Introduction

• Structure: Integrated one-piece design, with the input shaft and 1st gear forged from a single billet of high-strength 20CrMnTi alloy steel. The gear teeth are carburized, quenched, and precision-ground, achieving a surface hardness of HRC 58–62and a core hardness of HRC 33–45. The shaft features a splined end for clutch connection and precision-machined journal surfaces for bearing support.

• Key Specifications:

• Material: 20CrMnTi carburized steel (integral forging)

• Surface treatment: Carburizing + quenching + gear grinding

• Spline: External involute spline (clutch connection)

• Gear teeth: Precision-ground involute profile

• Operating temperature: -40°C to +150°C

  • Performance: The integral forging ensures maximum torsional rigidity, eliminating the risk of gear separation from the shaft. The hardened gear surface resists pitting and wear, while the precision-ground teeth ensure smooth, quiet meshing with the countershaft 1st gear.

Core Function

1. Power Input: Transmits engine torque from the clutch directly into the transmission.

2. Torque Multiplication: The integrated 1st gear provides the highest torque ratio for heavy-load starting and low-speed climbing.

3. Rigid Power Transfer: The one-piece design eliminates backlash and ensures zero-loss torque transmission.

Input Shaft And 1st Shaft Gear Assy AZ2203020205 – SINOTRUK HW Series Gearbox

When your SINOTRUK HW series gearbox demands a reliable replacement for the input shaft and 1st shaft gear assembly, precision engineering isn’t optional — it’s everything. The Input Shaft And 1st Shaft Gear Assy AZ2203020205 is manufactured to meet exact OEM specifications, ensuring seamless integration, reduced downtime, and long-lasting performance in heavy-duty applications. As a factory-direct supplier, Mettlead delivers this critical SINOTRUK gearbox component at competitive wholesale pricing, making it the smart choice for distributors and agents seeking dependable margins and consistent quality.

Key Features and Benefits of the AZ2203020205 Input Shaft Gear Assembly

This input shaft and 1st shaft gear assembly does more than simply transfer torque — it forms the backbone of your gearbox’s power delivery system. Here’s why experienced buyers trust this component:

• OEM-Grade Precision: Every tooth profile, spline dimension, and surface finish on the AZ2203020205 is engineered to replicate the original SINOTRUK specification, so you get drop-in fitment without modification.
• Superior Material Composition: Forged from high-grade alloy steel with carburizing and quenching heat treatment, this gear assembly delivers exceptional wear resistance and fatigue strength under continuous heavy loads.
• Extended Service Life: Thanks to precision grinding and strict tolerance control, this input shaft gear assy minimizes vibration and noise, ultimately prolonging the lifespan of the entire HW series gearbox.
• Wholesale-Friendly Pricing: Factory-direct sourcing from China eliminates middlemen, which means healthier profit margins for distributors and bulk buyers.
• Strict Quality Control: Each unit undergoes dimensional inspection, hardness testing, and surface defect checks before shipment — because a single failed gear can halt an entire fleet.
• White-Label & Custom Packaging Available: Build your own brand identity with OEM-neutral or custom-branded packaging tailored to your market requirements.

Technical Specifications

Below you’ll find the key parameters for the Input Shaft And 1st Shaft Gear Assy AZ2203020205. These specs help you confirm compatibility and communicate accurate details to your end customers:

Application Scenarios — Where the AZ2203020205 Fits

The Input Shaft And 1st Shaft Gear Assy AZ2203020205 is specifically designed for the SINOTRUK HW series gearbox, which is widely deployed across multiple heavy-duty truck platforms. In practical terms, you’ll find this component at work in the following situations:

• SINOTRUK HOWO heavy-duty trucks equipped with HW19710, HW15710, and HW10 transmission variants used in long-haul logistics, mining, and construction haulage.
• SITRAK C7H and C5H models where HW series gearboxes handle high-torque outputs from Weichai and MC engines.
• Fleet overhaul programs where bulk replacement of worn input shafts and 1st shaft gear assemblies restores transmission efficiency across dozens of vehicles simultaneously.
• Aftermarket repair workshops in Africa, Southeast Asia, the Middle East, and Central Asia — regions where SINOTRUK trucks dominate the commercial vehicle segment.

Whether you’re stocking parts for routine maintenance or supplying emergency replacement components to keep fleets moving, this assembly is a consistent high-demand item in the SINOTRUK gearbox parts category.

OEM/ODM Capability

Mettlead understands that wholesale agents and distributors often need more than just a part — they need a supply partner who adapts to their business model. Here’s what we bring to the table:

• White-Label Supply: Receive the AZ2203020205 input shaft gear assembly in completely neutral packaging, ready for your own branding and labeling.
• Custom Packaging Design: We produce packaging with your company logo, part numbers, barcodes, and market-specific language — so your brand shows up professionally in every box your customers open.
• Flexible MOQ: Whether you need a trial order to test market response or container-load quantities for established demand, our production capacity scales accordingly.
• Factory Visit Welcome: We invite you to inspect our facilities in person. Seeing our QC process, machining lines, and warehousing firsthand builds the kind of confidence that sustains long-term partnerships.
• Secure Payment Terms: Multiple payment methods with proper documentation and trade assurance protect both parties throughout the transaction.

Browse our full range of SINOTRUK HOWO truck parts and spare parts to see how we can become your one-stop gearbox component source.

Customer Case Study — AZ2203020205 Input Shaft Gear Assy in Action

A well-established truck parts distributor based in East Africa approached Mettlead with a recurring challenge: their local workshop clients were experiencing premature failure of input shaft and 1st shaft gear assemblies in SINOTRUK HW series gearboxes. The root cause? Inconsistent quality from unverified suppliers.

After switching to our Input Shaft And 1st Shaft Gear Assy AZ2203020205, the distributor reported a significant drop in warranty claims within just three months. Moreover, because each AZ2203020205 unit passed our strict dimensional and hardness inspection, their workshops gained confidence to offer extended repair guarantees to fleet operators.

The result was clear: higher customer retention, stronger margins on SINOTRUK HW gearbox components, and repeat orders shipped every 45 days. Today, this partner stocks over 200 SKUs of SINOTRUK HOWO gearbox parts from Mettlead — and the input shaft gear assembly remains their top-selling transmission component.

Frequently Asked Questions — AZ2203020205 Input Shaft And 1st Shaft Gear Assy

What exact gearbox models does the AZ2203020205 input shaft gear assembly fit?

The AZ2203020205 is designed for SINOTRUK HW series gearboxes, including variants like HW19710, HW15710, and related models. It’s always advisable to cross-reference with the specific gearbox nameplate or consult our team to verify compatibility for your application.

How does the heat treatment process affect the durability of this input shaft gear assy?

The carburizing and quenching process creates a hardened surface layer (HRC 58–62) while maintaining a tough, ductile core. This combination is critical because the tooth surface resists pitting and wear under heavy loads, while the core absorbs shock without cracking — exactly what a gearbox input shaft endures during daily operation.

Can I visually distinguish this part from a lower-quality alternative?

Yes, in most cases. A properly manufactured AZ2203020205 will show uniform grinding marks on gear teeth, consistent spline profiles with no burrs, and a smooth, even surface finish. Inferior copies often exhibit rough machining, uneven tooth spacing, or visible casting defects that compromise performance under load.

What causes premature failure of the input shaft and 1st shaft gear assembly in HW gearboxes?

Common causes include substandard material composition, improper heat treatment depth, incorrect tooth geometry, and contaminated gearbox oil. Using a quality-controlled AZ2203020205 eliminates the first three factors, while we recommend verifying oil cleanliness and viscosity during every installation.

Is this input shaft gear assembly sold individually or as a set?

The AZ2203020205 comes as a complete assembly — input shaft with the 1st shaft gear pre-assembled. This saves installation time and ensures the shaft-to-gear fit meets factory specifications without additional machining at the workshop level.

How should I store this part before installation?

Store the AZ2203020205 in its original packaging, in a dry and ventilated environment away from direct moisture or corrosive chemicals. The anti-corrosion coating provides protection during transit and short-term storage, but prolonged exposure to humidity may require additional rust-preventive oil application.

Get Your Wholesale Quote Today

Ready to secure factory-direct pricing on the Input Shaft And 1st Shaft Gear Assy AZ2203020205 for your SINOTRUK HW gearbox inventory? Whether you need a sample order for quality verification or bulk quantities for ongoing supply, Mettlead’s team responds fast with accurate pricing, lead times, and logistics options tailored to your market.

Take the next step: Contact us now to request a quotation, discuss MOQ flexibility, or arrange a factory visit. Let’s build a supply partnership that keeps your customers’ gearboxes running and your business growing.