ZF 4644.308.589 SPUR GEAR for WG180/WG181 | OEM Genuine Part

Overview

The ZF 4644.308.589 SPUR GEAR is a critical power transmission component engineered specifically for the WG180 and WG181 series transmissions. This OEM genuine part functions as the primary gear within the planetary gearset, transferring rotational force from the input shaft to the output assembly. Located in the intermediate housing section, the spur gear meshes directly with the 4644105413: DISCONNECTION mechanism to ensure smooth torque flow during gear shifts. The SKU 4644.308.589 is precision-machined to OEM tolerances, guaranteeing exact fitment and long service life in heavy-duty industrial applications.

Symptoms of Failure

• Grinding noise during acceleration: A worn 4644.308.589 spur gear produces a distinct metallic grinding sound, particularly when the transmission is under load, indicating tooth surface degradation.
• Intermittent gear slipping: As the gear teeth wear unevenly, the transmission may momentarily lose engagement, causing the vehicle to surge or hesitate during operation.
• Metal particles in transmission fluid: Flaking or chipped gear teeth introduce ferrous debris into the oil system, visible as glitter-like particles during fluid changes.
• Vibration through the driveline: Excessive backlash from a damaged spur gear creates harmonic vibrations felt through the chassis, worsening at specific RPM ranges.

Technical Specifications

Compatibility

This spur gear is designed for ZF WG180 and WG181 series transmissions, commonly found in medium-duty trucks, construction loaders, and agricultural tractors. It is also compatible with the WG200 series when used in conjunction with the 4642303093: OUTPUT FLANGE adapter kit. The gear interfaces directly with the 4644101222: TRANSMISSION HOUSING and is secured using the 0636021010: HEXAGON SCREW fasteners. Always verify your transmission serial number before ordering to ensure correct fitment.

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