ZF 4644.353.057 SPUR GEAR for WG200 | OEM Genuine Part

Overview

The ZF 4644.353.057 SPUR GEAR is a critical power transmission component engineered specifically for the WG 200 Series transmission. This OEM genuine part functions as the primary drive gear within the planetary gearset, transferring torque from the input shaft to the intermediate shaft assembly. Precision-machined from high-grade alloy steel, the spur gear ensures smooth, vibration-free operation under heavy load conditions. The SKU 4644.353.057 is a direct replacement for the original factory-installed gear, maintaining the exact tooth profile and hardness specifications required for reliable long-haul performance. This gear sits directly within the main housing, where it meshes with the countershaft gear train to facilitate seamless ratio changes.

Symptoms of Failure

• Whining or grinding noise during acceleration: Worn gear teeth produce a distinct high-pitched whine or metallic grinding sound, particularly noticeable when the transmission is under load. This is a classic sign of pitting or tooth face wear on the 4644.353.057 spur gear.
• Intermittent gear slipping under torque: As the spur gear loses its tooth profile integrity, the transmission may momentarily slip out of gear during hard acceleration or hill climbing, causing a sudden loss of drive power.
• Metal particles in transmission fluid: Flaking or chipping of the gear surface releases fine metallic debris into the oil, often visible during routine fluid changes or as sludge on the magnetic drain plug.
• Increased operating temperature: Excessive friction from a damaged spur gear generates abnormal heat, leading to fluid breakdown and potential thermal damage to adjacent components like the TRANSMISSION HOUSING.

Technical Specifications

Compatibility

This spur gear is primarily designed for the WG 200 Series transmission family, including models such as the WG200, WG210, and WG220. It is also compatible with the WG180 Series when used in specific gearset configurations, though verification of tooth count and shaft diameter is recommended. The gear interfaces directly with the TRANSMISSION HOUSING and is secured using a GROOVED STUD for precise axial alignment. For proper identification, always cross-reference the TYPE PLATE on your transmission unit before installation.

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