ZF 4644.308.623 SPUR GEAR for WG180 | OEM Genuine Part

Overview

The ZF 4644.308.623 SPUR GEAR is a critical power transmission component engineered specifically for the WG 180 series. This OEM genuine part sits within the planetary gearset assembly, where it meshes with adjacent pinions to transfer torque and manage rotational speed between the input shaft and the output shaft. The SKU 4644.308.623 is precision-machined to exact factory tolerances, ensuring seamless integration with the TRANSMISSION HOUSING and the HOUSING that encloses the gear train. Without this spur gear, the transmission cannot maintain proper gear ratios, leading to a complete loss of drive functionality.

Symptoms of Failure

When the ZF 4644.308.623 spur gear wears out, operators often notice distinct performance issues. Whining or grinding noises during acceleration indicate tooth surface fatigue or pitting, a common failure mode in high-mileage units. Intermittent gear slipping under load occurs when worn teeth fail to maintain positive engagement, causing the transmission to momentarily lose power delivery. Metal particles in the transmission oil filter are a telltale sign of spur gear degradation, as flaking material from the gear teeth contaminates the lubrication system. Additionally, erratic shifting patterns may develop as the worn gear disrupts the synchronization between the shift system and the output shaft.

Technical Specifications

Compatibility

This spur gear is primarily designed for the ZF WG 180 series transmissions, including the WG180, WG180A, and WG180B variants. It also fits select models in the WG200 series where the gearset architecture shares the same tooth profile and center distance. The part interfaces directly with the TYPE PLATE for identification and is secured using the GROOVED STUD during assembly. Always verify the transmission serial number against the OEM parts catalog before installation, as minor revisions in later production runs may require updated components.

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