Product Introduction

• Structure: Precision-forged from high-strength 20CrMnTi alloy steel, featuring an external involute gear tooth profile and internal splines for a press-fit connection to the input shaft. The gear is carburized, quenched, and precision-ground, achieving a surface hardness of HRC 58–62and a core hardness of HRC 33–45 for optimal wear resistance and impact toughness.

• Key Specifications:

• Material: 20CrMnTi carburized steel

• Surface treatment: Carburizing + quenching + gear grinding

• Fit type: Press-fit with internal splines

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

  • Performance: The hardened, ground tooth surface resists pitting and wear under high torque loads, while the tough core withstands shock loads during gear engagement. The precision-machined spline ensures zero backlash power transmission.

Core Function

1. Torque Transmission: Transmits engine torque from the input shaft to the countershaft 1st gear, providing the maximum torque multiplication ratio for heavy-load starting and low-speed climbing.

2. Power Transfer: Enables smooth meshing with the countershaft 1st gear to transfer power through the transmission.

3. Wear Resistance: The hardened tooth surface maintains performance over millions of cycles in heavy hauling and off-road conditions.

Input Shaft 1st Gear AZ2210040230 – SINOTRUK HW Series Gearbox Parts

When your SINOTRUK HW series gearbox demands a reliable first gear replacement, the Input Shaft 1st Gear AZ2210040230 delivers the precise fit and lasting durability your fleet needs. Engineered to match OEM specifications, this gearbox component ensures smooth power transmission from day one. Whether you’re restocking your warehouse or fulfilling urgent customer orders, Mettlead supplies this critical transmission part at factory-direct prices — so your margins stay healthy while your customers stay on the road.

As a trusted global supplier of SINOTRUK HOWO truck parts and gearbox components, Mettlead brings over a decade of experience in sourcing and distributing Chinese heavy-duty truck parts to distributors across Africa, the Middle East, Southeast Asia, and South America.

Key Features and Benefits of Input Shaft 1st Gear AZ2210040230

This isn’t just another gear — it’s a precision-crafted drivetrain component that keeps SINOTRUK HW transmissions shifting smoothly under heavy loads. Here’s what makes it stand out for wholesale buyers:

• OEM-Grade Precision: Manufactured to exact OEM dimensions, the AZ2210040230 input shaft 1st gear integrates seamlessly into the HW series gearbox without modification.
• Superior Material Strength: Forged from high-grade alloy steel, this gear is heat-treated for exceptional hardness and wear resistance — extending service life even in demanding operating conditions.
• Smooth Power Delivery: Precisely machined tooth profiles reduce noise, minimize vibration, and ensure efficient torque transfer from the input shaft to the gearbox assembly.
• Long-Lasting Durability: Designed to withstand the high torque loads and frequent shifting cycles typical of heavy-duty commercial transport, reducing warranty claims for distributors.
• Direct Replacement Fit: Drops right into place as a 1:1 replacement for the original SINOTRUK HW series input shaft first gear, which means faster turnaround for your repair shop customers.
• Cost-Effective Wholesale Pricing: Factory-direct sourcing eliminates middlemen, giving you competitive margins whether you buy 10 pieces or 1,000.

Technical Specifications – Input Shaft 1st Gear AZ2210040230

Accurate specs matter when you’re matching parts to customer orders. Below you’ll find the core parameters for this SINOTRUK HW series gearbox gear:

Need a specific measurement or drawing confirmation? Contact our parts specialists and we’ll verify the exact dimensions against your requirements within 24 hours.

Application Scenarios – Where Does AZ2210040230 Fit?

Understanding exactly where this part belongs helps you match it to the right customer needs. The Input Shaft 1st Gear AZ2210040230 is specifically designed for the following applications:

• Compatible Gearbox: SINOTRUK HW series heavy-duty manual transmission (HW15710, HW19710, and related models)
• Applicable Vehicles: SINOTRUK HOWO A7, HOWO T7H, SITRAK C7H, and other heavy trucks equipped with HW series gearboxes
• Function: Serves as the first gear on the input shaft assembly, handling initial drive engagement and low-speed, high-torque power delivery
• Typical Replacement Scenarios: Worn gear teeth, chipped tooth surfaces, excessive gear noise in first gear, difficulty engaging first gear, or complete gearbox overhaul

If your customers operate fleets of SINOTRUK heavy trucks for mining, long-haul logistics, or construction haulage, this input shaft 1st gear is one of the high-demand consumables you’ll want to keep in stock. Explore our full range of SINOTRUK HOWO gearbox parts for a complete transmission rebuild solution.

OEM/ODM Capability and White-Label Packaging

Mettlead understands that wholesale distributors have branding and packaging needs that go beyond just the part itself. That’s why we offer flexible options tailored for resellers:

• White-Label Packaging: Ship the Input Shaft 1st Gear AZ2210040230 under your own brand name. We provide neutral boxes with your logo, part number labels, and custom documentation.
• Custom Packaging Design: Need a specific box size, color scheme, or barcode format? Our packaging team accommodates your exact specifications.
• Strict Quality Control: Every AZ2210040230 gear undergoes dimensional inspection, hardness testing, and visual quality checks before shipment — so you receive consistent quality batch after batch.
• Flexible Order Quantities: Whether you need a trial order to test the market or a container load for established demand, we scale to your needs.
• Technical Support: Our engineers can provide interchange references, cross-reference guides, and fitting instructions to support your after-sales service.

In short, we don’t just sell parts — we help you build a reliable supply chain for SINOTRUK HOWO truck spare parts that your end customers can count on.

Customer Case Study – Input Shaft 1st Gear AZ2210040230 Bulk Order

A long-standing distributor based in Lagos, Nigeria, approached Mettlead looking for a dependable source of SINOTRUK HW series gearbox parts — specifically the Input Shaft 1st Gear AZ2210040230. Their previous supplier had inconsistent quality, with nearly 8% of gears failing hardness inspection upon arrival.

After switching to Mettlead, we supplied an initial trial batch of 50 pieces of AZ2210040230 input shaft 1st gears with full inspection reports included. The result? Zero defects on arrival. Within three months, the distributor scaled up to quarterly orders of 200+ pieces, pairing the input shaft 1st gear with other gearbox transmission parts from our catalog.

Today, this customer saves roughly 15% on landed cost compared to their previous supply channel — all while receiving consistent OEM-quality parts with custom-branded packaging. They’ve since expanded their orders to include SINOTRUK clutch parts, drive shafts, and differential components.

“Mettlead’s AZ2210040230 gears fit perfectly every time. Our workshop customers stopped complaining about first gear issues, and our return rate dropped to nearly zero.” — Distributor, West Africa

Frequently Asked Questions – Input Shaft 1st Gear AZ2210040230

What gearbox models does the AZ2210040230 Input Shaft 1st Gear fit?

The AZ2210040230 is designed specifically for the SINOTRUK HW series gearbox, including models such as HW15710 and HW19710. It fits vehicles like the HOWO A7, HOWO T7H, and SITRAK C7H that are equipped with these transmissions. If you’re unsure about compatibility with a specific gearbox variant, our team can cross-reference the part number for you.

What material is this input shaft 1st gear made from?

This gear is manufactured from high-grade alloy steel that undergoes a carburizing, quenching, and tempering heat treatment process. The result is a hardened tooth surface (HRC 58–62) with a tough, shock-resistant core (HRC 30–42) — the same standard used in genuine SINOTRUK gearbox production.

How can I verify the quality of AZ2210040230 before placing a large order?

We encourage new distributors to start with a sample or trial order. Every batch ships with a quality inspection report covering dimensional accuracy and hardness values. Additionally, you’re welcome to visit our facility in China to inspect the production and QC process firsthand.

What causes premature wear on the input shaft 1st gear?

Common causes include contaminated gearbox oil, improper clutch adjustment leading to shock loading during engagement, worn synchronizer rings allowing gear clash, and extended low-speed overloaded operation. Replacing with a quality AZ2210040230 gear and addressing the root cause prevents repeat failure.

Can I order the AZ2210040230 with my own brand packaging?

Absolutely. Mettlead offers full white-label and custom packaging services. You provide your logo, part number scheme, and packaging design preferences — we handle the rest. This is available even for modest order quantities, making it easy to build your own branded parts line.

What is the typical lead time for bulk orders of this gearbox gear?

For standard stock items like the Input Shaft 1st Gear AZ2210040230, lead time is typically 3–7 working days for quantities under 100 pieces. Larger orders or custom-packaged shipments generally require 10–15 working days. We’ll confirm exact timelines when you send your inquiry.

Ready to Stock the Input Shaft 1st Gear AZ2210040230?

Your customers need reliable SINOTRUK HW gearbox parts — and they need them fast. With Mettlead as your factory-direct supply partner, you get consistent quality, competitive wholesale pricing, and the flexibility to grow your parts business on your terms.

Here’s how to get started:

1. Send Your Inquiry: Share the part number (AZ2210040230), your target quantity, and any packaging requirements.
2. Receive Your Quote: We’ll respond within 24 hours with pricing, lead time, and shipping options to your destination.
3. Confirm and Ship: Once payment is arranged through our secure, flexible payment methods, your order enters production and QC before dispatch.

Don’t let gearbox part shortages cost you sales. Contact Mettlead today to request your wholesale quote for the Input Shaft 1st Gear AZ2210040230 and explore our complete catalog of SINOTRUK HOWO gearbox parts.