ZF 4644.302.138 SPUR GEAR for WG200/WG201 | OEM Genuine Part

Overview

The ZF 4644.302.138 SPUR GEAR is a precision-machined component engineered for the WG200 and WG201 series transmissions. This OEM genuine part functions as a critical power transfer element within the gear train, meshing with adjacent shafts to deliver smooth torque flow and maintain correct rotational speed ratios. Located in the intermediate shaft assembly, the 4644.302.138 spur gear directly influences shift quality and overall driveline efficiency. When installed alongside the 4460115043: HOUSING, it ensures proper alignment and load distribution within the transmission casing.

Symptoms of Failure

• Whining or grinding noise during acceleration: Worn gear teeth produce a distinct metallic sound, especially under load, indicating surface fatigue or pitting on the 4644.302.138 spur gear.
• Erratic shifting or gear slippage: Damaged tooth profiles fail to maintain consistent engagement, causing the transmission to hesitate or slip out of gear during operation.
• Metal particles in transmission fluid: Advanced wear generates ferrous debris that contaminates the oil, often visible during routine fluid changes or filter inspections.
• Vibration through the drivetrain: Uneven tooth wear creates rotational imbalance, transmitting noticeable vibration to the vehicle chassis at specific speeds.

Technical Specifications

Compatibility

This spur gear is specifically designed for the ZF WG200 and WG201 series transmissions, commonly found in medium-duty trucks, buses, and industrial machinery. It also fits select variants of the WG180 series where the intermediate shaft gear train shares identical tooth geometry. For proper installation, always pair this gear with the 4469315012: AXLE DRIVE HOUSING to maintain correct bearing preload. Additionally, the 0750117406: TAPER ROLLER BEARING and 0750117802: TAPERED ROLLER BEARING are essential for supporting the gear shaft under heavy loads.

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