Product Introduction

• Structure: Precision machined from high-strength 40Cr alloy steel, with an external involute tooth profile (24 teeth) and a smooth inner bore. A single positioning notch on the inner bore secures it to the oil pump housing, preventing rotation during operation. The tooth surface undergoes high-frequency quenching and precision grinding, achieving surface hardness HRC 52–56for wear resistance, and a core hardness of HRC 28–32 for impact toughness.

• Performance: The high-frequency quenched tooth surface resists wear during long-term meshing with the oil pump rotor, maintaining consistent oil pressure for over 50,000 hours of operation. The positioning notch ensures stable fixation, preventing gear ring rotation that could cause pressure fluctuations or pump failure.

Core Function

1. Oil pressure generation: As the fixed component of the gerotor pump, it meshes with the inner rotor to create variable-volume chambers, drawing oil from the sump and pressurizing it for transmission lubrication.

2. Stable pressure output: The precision-machined tooth profile ensures uniform oil pressure (0.2–0.6 MPa) across all operating conditions, preventing lubrication starvation or excessive pressure.

3. Wear resistance: The hardened tooth surface withstands continuous meshing friction, extending the service life of the oil pump assembly.

Internal Gear Ring Of Oil Pump AZ2210240002 – SINOTRUK HW Series Gearbox

When your SINOTRUK HW Series Gearbox demands reliable oil circulation, every single component matters — especially the internal gear ring of the oil pump. The Internal Gear Ring Of Oil Pump AZ2210240002 is engineered to maintain consistent hydraulic pressure inside the transmission, ensuring smooth gear shifts and long-lasting gearbox performance. At Mettlead, we supply this genuine-spec part directly from our factory in China, which means you get uncompromised quality at a price that makes your procurement budget work harder.

Why the Internal Gear Ring Of Oil Pump AZ2210240002 Matters for Your Fleet

Think of the internal gear ring as the heartbeat of your gearbox oil pump. Without it functioning at peak precision, lubricant flow drops, heat builds up, and your entire transmission system suffers premature wear. Here is what this component delivers when it is working correctly:

• Consistent Oil Pressure: The internal gear ring meshes with the outer rotor to create stable suction and discharge cycles, keeping lubricant flowing evenly across all moving parts inside the HW series gearbox.
• Reduced Friction and Heat: By maintaining optimal oil delivery, this gear ring minimizes metal-to-metal contact, which directly extends the service life of bearings, synchronizers, and gear teeth.
• Precision Fit for HW Gearbox: Manufactured to OEM dimensional tolerances, the AZ2210240002 drops right into the oil pump housing without modification — saving your workshop time and labor costs.
• Durable Material Composition: Made from high-grade alloy steel with surface hardening treatment, this gear ring resists pitting, scoring, and fatigue even under heavy-duty operating conditions.
• Lower Long-Term Maintenance Costs: A properly functioning oil pump internal gear ring prevents cascading transmission failures, so you spend less on emergency repairs and unplanned downtime.

Technical Specifications – AZ2210240002 Internal Gear Ring

Application Scenarios – Where Does This Part Fit?

The Internal Gear Ring Of Oil Pump AZ2210240002 is specifically designed for the SINOTRUK HW series gearbox oil pump assembly. If you manage fleets or distribute parts for heavy-duty trucks, this is a component you will encounter regularly during scheduled transmission maintenance. Here are the primary application scenarios:

• Compatible Gearbox Models: HW19710, HW15710, HW20716, and other SINOTRUK HW series manual transmissions.
• Compatible Truck Models: SINOTRUK HOWO A7, HOWO T7H, HOWO T5G, SITRAK C7H, and various SINOTRUK heavy-duty tippers, tractors, and cargo trucks equipped with HW transmissions.
• Maintenance Context: Typically replaced during oil pump overhaul when inspection reveals wear on gear ring teeth, excessive clearance between inner and outer rotors, or declining transmission oil pressure readings.
• Aftermarket Replacement: Ideal for fleet workshops, independent repair garages, and parts distributors serving African, Middle Eastern, Southeast Asian, and South American markets where SINOTRUK trucks operate extensively.

For more SINOTRUK gearbox components, browse our complete Gearbox Parts Category or visit our dedicated SINOTRUK HOWO Gearbox Parts page for a full catalog.

OEM/ODM Capability – Tailored to Your Business Needs

At Mettlead, we understand that different markets have different requirements. That is why we offer flexible options beyond simply shipping a standard part:

• White-Label Packaging: Need to sell under your own brand? We provide neutral or custom-branded packaging that aligns with your company identity — no minimum branding fees.
• Custom Packaging Solutions: Whether you need individual blister packs for retail display or bulk industrial cartons for wholesale distribution, we adapt to your format.
• Strict Quality Control: Every Internal Gear Ring Of Oil Pump AZ2210240002 passes dimensional inspection, hardness testing, and surface finish verification before leaving our facility. We catch defects so you never have to deal with customer complaints.
• Factory-Direct Pricing: Because we source and manufacture in-house, there are no middleman markups. You receive competitive pricing that protects your margins, especially on bulk orders.
• Comprehensive Product Range: Beyond this single part, we supply the complete SINOTRUK, SHACMAN, FAW, WEICHAI, DONGFENG, and FOTON parts catalog. Consolidate your sourcing with one trusted supplier.

Explore our full range of SINOTRUK truck parts and accessories on our SINOTRUK HOWO Truck Parts brand page.

Customer Case Study – AZ2210240002 Bulk Procurement Success

Earlier this year, a fleet maintenance company based in East Africa reached out to us with an urgent requirement. They managed over 120 SINOTRUK HOWO tipper trucks operating in mining logistics, and their workshop was burning through internal gear rings of oil pumps at a faster rate than their existing supplier could deliver. Downtime was costing them thousands of dollars per week.

After reviewing their specifications, we confirmed that the Internal Gear Ring Of Oil Pump AZ2210240002 for the SINOTRUK HW Series Gearbox was exactly what they needed. We shipped an initial order of 200 pieces within 7 working days, packaged in their custom-branded boxes. The result? Their transmission overhaul turnaround time dropped by 40%, and they reported zero quality rejections across the entire batch.

Today, they order from Mettlead on a quarterly schedule and have expanded their procurement to include other HW series gearbox components. That is the kind of long-term partnership we build — one reliable part at a time.

Frequently Asked Questions – Internal Gear Ring Of Oil Pump AZ2210240002

What is the function of the internal gear ring in the HW gearbox oil pump?

The internal gear ring of the oil pump works together with the external rotor to create suction and pressure within the pump cavity. As it rotates, it draws transmission oil from the sump and pushes it through the gearbox lubrication circuit. Without a properly functioning internal gear ring, oil pressure drops and the entire transmission starves for lubrication — leading to overheating and accelerated wear on gears and bearings.

How do I know when the AZ2210240002 internal gear ring needs replacement?

Common signs include declining transmission oil pressure on the dashboard gauge, unusual whining noises from the gearbox area, increased operating temperature of the transmission housing, and visible scoring or pitting on the gear ring teeth during disassembly inspection. If your workshop measures excessive radial clearance between the inner and outer rotors during a pump teardown, replacement is necessary.

Is this internal gear ring compatible with all SINOTRUK HW gearbox variants?

Yes, the AZ2210240002 is designed for the SINOTRUK HW series gearbox family, including HW19710, HW15710, and HW20716 models. However, we always recommend cross-referencing the OEM part number with your specific gearbox assembly drawing to confirm fitment before ordering in bulk.

What material is the AZ2210240002 gear ring made from, and how durable is it?

This internal gear ring is manufactured from high-grade alloy steel, then undergoes carburizing and quenching heat treatment to achieve a tooth surface hardness of HRC 58–62. This process gives the part exceptional resistance to wear, pitting fatigue, and surface scoring — even under the extreme loads typical of heavy-duty trucking applications.

Can I order a sample before committing to a bulk purchase?

Absolutely. We encourage new buyers to request samples so they can verify dimensional accuracy, material quality, and fitment in their specific gearbox assemblies before placing larger orders. Simply reach out to our team, and we will arrange a sample shipment promptly.

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

For standard stock quantities, we typically ship within 5–10 working days after payment confirmation. Larger custom orders or white-label packaging requests may require 15–20 working days depending on quantity and packaging specifications. We keep popular SINOTRUK gearbox parts like the AZ2210240002 in ready stock to minimize your waiting time.

Ready to Secure Your Supply of AZ2210240002 Internal Gear Rings?

Your trucks cannot afford gearbox downtime, and your business cannot afford unreliable suppliers. Whether you need 10 pieces or 10,000, Mettlead delivers the Internal Gear Ring Of Oil Pump AZ2210240002 for SINOTRUK HW Series Gearbox with factory-direct pricing, rigorous quality inspection, and fast international shipping.

Take the next step today:

1. Tell us your required quantity and preferred packaging format.
2. Receive a detailed quotation within 24 hours.
3. Get your parts shipped quickly and reliably to your door.

Contact Us Now to request a quote, ask technical questions, or arrange a factory visit. Our team is ready to support your procurement needs with the professionalism and speed you expect from a trusted Chinese truck parts supplier.