Product Introduction

This release bearing is a critical component of the clutch actuation system, enabling smooth clutch disengagement and engagement during gear shifts.

• Structure & Material: Precision-machined from high-strength bearing steel, with an integrated roller bearing and guide sleeve. The outer surface is hardened for wear resistance, while the internal rollers ensure low-friction rotation.

• Performance: Designed to withstand high rotational speeds and axial loads, with a sealed construction to prevent contamination and maintain lubrication. It operates with minimal noise and vibration, ensuring a smooth driving experience.

• Compatibility: Direct OE replacement, fully matching the clutch actuation system interface and performance specifications of Sinotruk heavy-duty vehicles.

Core Function

1. Clutch Disengagement: Transmits the actuation force from the clutch fork to the clutch pressure plate, disengaging the clutch from the flywheel to enable gear shifts.

2. Low-Friction Operation: The internal roller bearing allows the release bearing to rotate with the clutch pressure plate, reducing friction and wear during operation.

3. Wear Resistance: The hardened steel construction and sealed design ensure long service life under heavy-duty conditions, even with frequent clutch actuation.

Release Bearing Kzi-4.5 WG2209260005 – SINOTRUK HW Series Gearbox Parts

When your SINOTRUK HW series gearbox demands a smooth, reliable clutch disengagement, the Release Bearing Kzi-4.5 WG2209260005 steps in as the critical link between driver input and transmission response. Engineered specifically for heavy-duty applications, this gearbox release bearing ensures precise gear shifting, reduced drivetrain vibration, and extended service life — even under the harshest operating conditions. Whether you’re stocking inventory for fleet maintenance or supplying aftermarket distributors, Mettlead delivers this essential component at competitive factory-direct prices with dependable global logistics.

Key Features and Benefits of Release Bearing Kzi-4.5 WG2209260005

Understanding what makes this SINOTRUK HW series gearbox release bearing stand out helps you make smarter purchasing decisions. Here’s why seasoned distributors and fleet managers rely on this part:

• Precision-Engineered for Heavy Loads: The Kzi-4.5 release bearing is built to handle the substantial thrust forces generated by SINOTRUK heavy-duty clutch systems, ensuring consistent disengagement without premature wear.
• OEM-Grade Material Composition: Manufactured using high-carbon chromium bearing steel with heat-treated raceways, this component mirrors the durability and tolerance standards of the original SINOTRUK specification.
• Low-Friction Performance: Thanks to optimized internal geometry and pre-lubricated rolling elements, this bearing significantly reduces friction heat during clutch operation, extending both bearing and clutch plate lifespan.
• Vibration Dampening: The integrated design minimizes NVH (noise, vibration, harshness) during gear transitions, contributing to a smoother driving experience for operators on long-haul routes.
• Drop-In Fitment: Dimensionally matched to the SINOTRUK HW gearbox housing, the WG2209260005 release bearing installs without modification, saving labor time during fleet maintenance turnarounds.
• Extended Service Intervals: By maintaining stable thermal performance and wear resistance, this bearing supports longer maintenance cycles — a significant cost advantage for fleet operators managing large vehicle inventories.

Application Scenario: Where Does the Release Bearing Kzi-4.5 WG2209260005 Fit?

This Release Bearing Kzi-4.5 WG2209260005 is designed as a direct replacement part for the SINOTRUK HW series gearbox clutch release mechanism. More specifically, it serves as the Kzi-4.5 clutch release bearing in the following applications:

• Compatible Gearbox: SINOTRUK HW series manual transmission (HW19710, HW15710, HW20716, and related variants)
• Compatible Vehicle Models: SINOTRUK HOWO A7, HOWO T7H, SITRAK C7H, and other heavy-duty trucks equipped with HW series gearboxes
• Function: Gearbox clutch release bearing — responsible for disengaging the clutch pressure plate from the flywheel during gear shifts
• System Category: Transmission and clutch system components

In practical terms, every time a driver presses the clutch pedal on a SINOTRUK heavy truck fitted with an HW gearbox, the WG2209260005 release bearing absorbs the thrust load and enables clean gear transitions. Consequently, a worn or failing release bearing leads to hard shifting, gear grinding, and ultimately costly transmission damage — making timely replacement essential for fleet uptime.

Explore our complete range of gearbox parts and SINOTRUK HOWO gearbox components for related transmission parts.

Technical Specifications

Accurate specifications matter when you’re sourcing SINOTRUK gearbox parts for wholesale. Below is the detailed technical data for the Release Bearing Kzi-4.5 WG2209260005:

OEM/ODM Capability and Custom Packaging

As a wholesale distributor or regional agent, your brand identity matters just as much as product quality. Mettlead understands this, which is why we offer flexible branding and packaging options for the Release Bearing Kzi-4.5 WG2209260005 and our entire range of SINOTRUK HOWO truck parts:

• White-Label Supply: Receive products in neutral packaging, ready for your own branding and labeling — ideal for distributors building a regional parts brand.
• Custom Packaging: We can print your brand logo, part number cross-reference, and certification marks directly on the box or sleeve packaging at volume MOQs.
• Strict Quality Control: Every batch of WG2209260005 release bearings undergoes dimensional inspection, hardness testing, and rotational noise checks before dispatch, ensuring consistent quality across large orders.
• Flexible MOQ: Whether you need a trial order of 50 pieces or a container load of 5,000 units, our production line accommodates varying quantities without compromising lead time.
• Cross-Reference Support: Our engineering team can match your existing part numbers or competitor references to ensure the correct Kzi-4.5 bearing specification reaches your shelves.

Customer Case Study: Release Bearing Kzi-4.5 WG2209260005 in the Field

To illustrate the real-world impact of sourcing Release Bearing Kzi-4.5 WG2209260005 from Mettlead, consider this scenario from one of our long-standing African market partners:

A truck parts distributor based in Lagos, Nigeria, had been experiencing high return rates on aftermarket clutch release bearings sourced from a previous supplier. Their SINOTRUK HOWO fleet customers reported premature bearing noise and clutch slippage within 20,000 km — far below the expected 80,000 km service interval for HW series gearbox release bearings.

After switching to Mettlead’s WG2209260005 Kzi-4.5 release bearing, the distributor conducted a controlled field test across 30 HOWO A7 trucks running heavy-load intercity routes. The results told a clear story: zero bearing failures through 90,000 km, no abnormal clutch noise, and a 100% drop in warranty returns for this component. Furthermore, the factory-direct pricing allowed them to increase per-unit margins by 18% compared to their previous source.

Today, this distributor orders Release Bearing Kzi-4.5 WG2209260005 from Mettlead in quarterly container shipments and has expanded their range to include additional SINOTRUK HW gearbox parts — synchronizers, gear shafts, and shift forks — all backed by the same quality assurance process.

Frequently Asked Questions (FAQ)

What is the exact function of Release Bearing Kzi-4.5 WG2209260005 in the SINOTRUK HW gearbox?

The Release Bearing Kzi-4.5 WG2209260005 serves as the clutch thrust bearing within the SINOTRUK HW series gearbox assembly. When the driver depresses the clutch pedal, this bearing transfers axial force to the clutch pressure plate fingers, disengaging the clutch disc from the flywheel. Essentially, it’s the mechanical bridge that enables every gear change in the transmission.

How can I verify that WG2209260005 is the correct release bearing for my customer’s truck?

The most reliable method is to cross-reference the OEM part number WG2209260005 against the vehicle’s gearbox nameplate data. This bearing fits SINOTRUK HW series gearboxes (HW19710, HW15710, HW20716, etc.) installed in HOWO A7, T7H, and SITRAK C7H models. If you’re unsure, send us the gearbox model number and VIN — our technical team will confirm compatibility within 24 hours.

What are the common symptoms of a worn Kzi-4.5 release bearing?

Experienced mechanics typically look for these telltale signs: a grinding or whining noise when the clutch pedal is depressed (that disappears when released), increased clutch pedal vibration, difficulty engaging or disengaging gears smoothly, and in advanced cases, visible clutch slippage under load. Replacing the Release Bearing WG2209260005 at the first sign of noise prevents cascading damage to the clutch pressure plate and input shaft.

Does the Release Bearing Kzi-4.5 WG2209260005 require external lubrication after installation?

No. The Kzi-4.5 release bearing comes pre-lubricated with a sealed high-temperature grease fill and features double rubber seals (2RS configuration). This sealed design eliminates the need for periodic greasing and prevents dust or moisture contamination — a significant advantage in harsh African, Middle Eastern, and Southeast Asian operating environments.

What is the expected service life of this release bearing under normal heavy-duty conditions?

Under standard heavy-load operating conditions (40–50 ton GVW, mixed highway and urban routes), the WG2209260005 Kzi-4.5 release bearing typically delivers 80,000 to 120,000 km of service life before requiring replacement. However, actual lifespan depends on driving habits, clutch adjustment, and environmental conditions. Fleet operators who maintain proper clutch free-play settings consistently see the upper end of this range.

Can I use this bearing in non-SINOTRUK gearboxes that share similar dimensions?

While the Kzi-4.5 bearing dimensions (45mm ID × 78mm OD × 20mm width) might physically fit other gearbox housings, we strongly recommend using the WG2209260005 exclusively in SINOTRUK HW series gearboxes. The thrust load rating, sleeve fitment, and engagement geometry are engineered specifically for this transmission family. Fitting it into an incompatible application could lead to premature failure or clutch damage.

Ready to Stock Release Bearing Kzi-4.5 WG2209260005 at Factory-Direct Prices?

Mettlead is your reliable source for genuine-quality SINOTRUK HW series gearbox parts, including the Release Bearing Kzi-4.5 WG2209260005. With competitive wholesale pricing, flexible MOQs, white-label packaging options, and fast international shipping, we make it straightforward for distributors and agents to build profitable inventory.

Take the next step toward better margins and happier customers. Contact us today to request a quotation, confirm compatibility, or discuss custom packaging for your market. Our sales team typically responds within 12 hours — because in the truck parts business, downtime costs money.

Browse our full catalog of SINOTRUK HOWO truck spare parts and gearbox components to find everything you need in one place.