ZF 4646.351.149 GEAR for WG251 | OEM Genuine Part

Overview

The ZF 4646.351.149 GEAR is a precision-machined helical gear designed specifically for the WG 251 series of heavy-duty powershift transmissions. This OEM genuine part sits within the planetary gearset assembly, where it transfers torque from the input shaft to the intermediate shaft, ensuring smooth power delivery under high load conditions. The SKU 4646.351.149 is manufactured to ZF’s original tolerances, making it a direct replacement for worn or damaged gears in the WG251 drivetrain. When installed alongside a properly sealed TRANSMISSION HOUSING, this gear maintains critical alignment and reduces vibration in the gear train.

Symptoms of Failure

• Whining or grinding noise during gear engagement: A worn 4646.351.149 gear produces a high-pitched whine that intensifies under acceleration, indicating tooth surface degradation.
• Intermittent gear slipping under load: When the gear teeth lose their hardened profile, the transmission may momentarily lose torque transfer, especially when climbing grades or hauling heavy loads.
• Metallic debris in transmission fluid: Flaking or pitting on the gear surface releases fine metal particles into the oil, often visible during routine fluid changes or when inspecting the SCREEN SHEET.
• Vibration through the shift lever or chassis: Uneven wear on the gear’s helical teeth creates cyclic vibration that can be felt in the operator station, worsening as the gear continues to degrade.

Technical Specifications

Compatibility

This gear is engineered for the ZF WG 251 series transmission, which is commonly used in off-highway vehicles such as wheel loaders, dump trucks, and agricultural tractors. Based on its design and tooth geometry, the 4646.351.149 GEAR is also compatible with the following ZF transmission models that share the same planetary gearset architecture: WG180, WG200, WG210, and WG240. Always verify the gear count and shaft spline configuration against your specific transmission serial number before installation. The gear mounts directly into the HOUSING and is secured with a CAP SCREW and a COVER to prevent axial movement.

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