ZF 4644.308.590 SPUR GEAR for WG200/WG201 | OEM Genuine Part

Overview

The ZF 4644.308.590 SPUR GEAR is a critical power transmission component engineered for the WG200 and WG201 series transmissions. This OEM genuine part is responsible for precise torque transfer between parallel shafts within the gear train, directly influencing shift quality and overall driveline efficiency. Positioned within the intermediate shaft assembly, the spur gear meshes with adjacent gears to maintain correct rotational speed and load distribution. The SKU 4644.308.590 is manufactured to ZF’s original specifications, ensuring exact fitment and durability under high-stress industrial applications. When replacing this gear, it is essential to inspect the TRANSMISSION HOUSING and TRANSMISSION HOUSING for wear, as these components share the same assembly environment.

Symptoms of Failure

Recognizing early warning signs of a worn spur gear can prevent catastrophic transmission damage. Common failure symptoms include:

• Whining or grinding noise during gear engagement – A high-pitched sound from the transmission casing often indicates tooth surface pitting or chipping on the 4644.308.590 gear.
• Intermittent gear slipping under load – When the spur gear loses tooth profile integrity, the transmission may momentarily lose torque transfer, especially during uphill or heavy-load operations.
• Metallic debris in transmission oil – Fine steel particles found during routine oil changes signal advanced wear of the gear teeth, requiring immediate replacement.
• Vibration at specific RPM ranges – Uneven tooth wear creates harmonic vibrations that can be felt through the gearshift lever or chassis, often misdiagnosed as bearing failure.

Technical Specifications

Compatibility

This spur gear is specifically designed for the ZF WG200 and ZF WG201 transmission series, commonly found in medium-duty trucks, buses, and industrial machinery. It is also compatible with the WG180 series in certain configurations where the intermediate shaft gear ratio matches. Always verify the transmission serial number before installation. During assembly, ensure the TYPE PLATE is correctly affixed for future identification, and use a GROOVED STUD to secure the gear hub to the shaft. For complete rebuilds, inspect the COVER PLATE and COVER PLATE for distortion, and replace the SCREEN TUBE if clogged with debris.

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