ZF 4644.323.005 RING GEAR for WG200 | OEM Genuine Part

Overview

The ZF 4644.323.005 RING GEAR is a critical internal component engineered specifically for the WG 200 Series transmission family. This OEM genuine part functions as the primary torque-transfer interface within the planetary gear set, converting hydraulic motor power into rotational force for the output shaft. Positioned directly within the gear train assembly, the ring gear meshes with planetary pinions to deliver smooth, high-torque performance under heavy-duty industrial loads. The SKU 4644.323.005 is precision-machined to exact OEM tolerances, ensuring seamless integration with your existing ZF transmission architecture.

Symptoms of Failure

• Audible gear whine or grinding noise during acceleration: When the ring gear teeth wear unevenly, you will hear a distinct high-pitched whine or metallic grinding sound, particularly under load. This is a common indicator that the 4644.323.005 requires immediate replacement.
• Intermittent gear slipping under heavy torque: A worn ring gear can cause the planetary set to lose engagement, resulting in sudden power loss or slipping during high-torque operations, such as climbing or hauling.
• Metallic debris in transmission fluid: As the ring gear surface degrades, microscopic metal particles will contaminate the hydraulic fluid. You may notice a dark, gritty residue during routine fluid changes or on the magnetic drain plug.
• Vibration through the driveline at specific RPM ranges: Uneven tooth wear on the ring gear creates harmonic vibrations that are felt through the chassis, often intensifying between 1500-2000 RPM.

Technical Specifications

Compatibility

This ring gear is primarily designed for the ZF WG 200 Series transmissions, including the WG200, WG201, and WG202 variants. It is also compatible with the ZF WG 180 Series (WG180, WG181) due to shared planetary gear architecture. For optimal performance, always verify your transmission model number before ordering. The 4644.323.005 is not compatible with the WG 120 or WG 150 series.

During installation, this ring gear is typically mounted alongside the 4460165051 CONSOLE and the 4460368311 CONSOLE, which provide structural support for the planetary carrier. Secure fastening is achieved using the 0636011429 HEXAGON SCREW and the 0730100365 WASHER to ensure proper torque retention and vibration resistance.

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