The Idle gear composite member is an essential component of the HOWO A7 8X4 transmission, responsible for reversing the direction of rotation and enabling reverse gear operation. This assembly consists of precision-machined parts that work together to transmit torque smoothly while maintaining minimal backlash and noise. The Idle gear composite member is engineered to withstand high shock loads and continuous operation in heavy-duty trucking applications.
At howo Parts, we supply a complete Idle gear composite member that includes all necessary subcomponents: Idle gear, Needle bearing, Shim, Idle gear axle (right and left). Each part is manufactured to strict OEM tolerances, ensuring a perfect fit and reliable performance. The Idle gear composite member plays a critical role in the gearbox, allowing for smooth engagement of reverse gear without excessive wear.
This assembly is constructed from high-grade alloy steel, with gears that are case-hardened and precision-ground. The Needle bearings provide low-friction support, while the Shims allow for precise axial adjustment. With proper maintenance, the Idle gear composite member delivers consistent performance over extended service intervals.
The Idle gear is the primary gear in the assembly, meshing with the countershaft and main shaft gears to reverse rotation direction. Its robust design accommodates high torque loads and frequent engagement cycles.
Manufactured from case-hardened steel with precisely cut teeth, the Idle gear ensures quiet and efficient power transmission. Its tooth profile is optimized for durability and minimal wear.
Regular inspection of the Idle gear for chipping or pitting is recommended to prevent transmission failure.
The Needle bearing is a roller bearing with long, thin cylindrical rollers that provide high radial load capacity in a compact space. It supports the Idle gear on its axle, reducing friction and enabling smooth rotation.
These bearings are made from high-carbon chromium steel with a precision-ground surface, ensuring consistent performance and long service life. Their design allows for high-speed operation with minimal heat generation.
Replacement of Needle bearings is essential during overhaul to maintain low friction and prevent scoring of the axle.
The Shim is a thin, flat washer used to adjust the axial clearance of the Idle gear composite member. It ensures that the gear remains correctly positioned relative to adjacent components, preventing end float and excessive wear.
Manufactured from hardened steel with a precise thickness, the Shim is available in various sizes to suit different clearance requirements. Its surface is ground to maintain flatness.
Correct selection and installation of Shims is critical for optimal gear mesh and bearing life.
The Idle gear axle (right) is a hardened steel shaft that supports the Idle gear and Needle bearings on the right side of the assembly. It provides a fixed pivot point for the gear to rotate freely.
This axle is precision-ground to achieve a smooth surface finish, reducing friction and wear on the bearings. Its diameter and length are matched to the housing dimensions for a precise fit.
Inspection of the axle for scoring or wear is important, as any damage can lead to bearing failure and gear misalignment.
The Idle gear axle (left) is the counterpart to the right axle, supporting the opposite side of the Idle gear. It ensures balanced load distribution and stable gear rotation.
Manufactured to the same standards as the right axle, it features identical dimensions and surface finish, ensuring interchangeability and ease of assembly.
Both axles should be checked for straightness and wear during transmission servicing.
| Part NO. | Description |
|---|---|
| WG2210050001 | Idle gear |
| WG9003395320 | Needle bearing |
| WG2229050001 | Shim |
| WG2212050102 | Idle gear axle (right) |
| WG2212050101 | Idle gear axle (left) |
| WG2229050001 | Shim |
| WG9003395320 | Needle bearing |
| WG2210050001 | Idle gear axle |
All components of our Idle gear composite member are forged from high-quality alloy steels and undergo rigorous heat treatment to achieve optimal hardness and wear resistance. This ensures long service life even under severe operating conditions.
Our Needle bearings are manufactured to the highest precision standards, guaranteeing smooth rotation and minimal friction.
Every gear, axle, and Shim in our Idle gear composite member is CNC-machined to tight tolerances, ensuring perfect fit and alignment. This precision reduces noise and vibration, contributing to a quieter and more comfortable driving experience.
Our Shims are available in a range of thicknesses to allow for exact axial clearance adjustment.
The Idle gear composite member is designed for straightforward assembly and disassembly. All parts are clearly marked for orientation, and the Needle bearings are pre-lubricated for immediate use.
We provide comprehensive technical documentation to assist with correct installation and clearance setting.
We maintain a large inventory of Idle gear composite member parts, ensuring rapid delivery to customers worldwide. Our technical support team is available to answer any questions regarding selection, installation, or troubleshooting.
Whether you need a single Idle gear or a complete set of Shims, we can fulfil your order quickly.
The Idle gear composite member is a crucial element in the transmission that enables the vehicle to move in reverse. When the driver selects reverse gear, the Idle gear moves into mesh with both the countershaft gear and the main shaft reverse gear, reversing the output shaft rotation direction. Without this assembly, reverse motion would be impossible.
Our Idle gear composite member is engineered to engage smoothly and quietly, reducing the shock loads that can cause component fatigue. The use of Needle bearings and hardened axles ensures that the gear rotates with minimal resistance.
The Idle gear composite member operates in a high-temperature environment, with oil splash lubrication. Our components are designed to withstand thermal expansion without seizing, and the Needle bearings maintain their clearances across a wide temperature range.
The gears are designed to distribute loads evenly, preventing localized stress concentrations that can lead to tooth breakage.
When assembling the Idle gear composite member, it is essential to set the correct axial end play using the appropriate Shims. Too little clearance can cause binding and overheating, while too much clearance can result in gear clatter and uneven tooth wear.
Refer to the service manual for the recommended clearance values. We offer a comprehensive Shim kit that includes multiple thicknesses to simplify this adjustment.
We recommend inspecting the Idle gear composite member during every major transmission service, typically every 100,000 to 150,000 kilometres. Check the gear teeth for pitting, the Needle bearings for roughness, and the axles for scoring.
Replace any worn components immediately to avoid damage to the mating gears and housing.
Our Idle gear composite member is specifically designed for the HOWO A7 8X4 transmission, which is widely used in construction, mining, and heavy freight applications. The dimensions and spline configurations match the original factory parts.
Whether you have a manual or automated transmission, our assembly provides a direct replacement.
All our Idle gear composite member components undergo 100% inspection, including dimensional checks, hardness testing, and magnetic particle inspection. We provide a warranty against manufacturing defects, giving you full confidence in our products.
Our commitment to quality ensures that you receive only the highest-grade parts for your truck.
We have multiple warehouse locations strategically positioned to serve global markets. Standard delivery times are typically 3-5 business days, with expedited options available for urgent orders.
We also offer custom packaging and bulk discounts for fleet operators.
Choosing our Idle gear composite member reduces the total cost of ownership by extending transmission life and reducing unplanned downtime. The durability of our gears, bearings, and axles ensures reliable operation over millions of kilometres.
Invest in genuine howo Parts to keep your HOWO A7 8X4 operating at peak efficiency.
Our online catalog provides comprehensive access to genuine SINOTRUK parts for all major vehicle lines — including HOWO, Sitrak, Steyr, and Yellow River series trucks. You can browse detailed specifications, original part numbers, and exploded-view diagrams for every assembly. Whether you are performing routine maintenance or planning a major overhaul, the catalog helps you quickly identify the correct components for your vehicle. When you become a SINOTRUK customer, we offer complimentary full‑access catalog services, ensuring you always have the latest product data and interchangeability information at your fingertips to support efficient fleet management and accurate parts ordering.
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