ZF 4651.351.008 SPUR GEAR for WG100 | OEM Genuine Part

Overview

The ZF 4651.351.008 SPUR GEAR is a critical power transmission component engineered specifically for the WG 100 Series transmission assembly. This OEM genuine part, identified by SKU 4651.351.008, functions as a precision-machined gear that transfers rotational force between parallel shafts within the gear train. It sits directly within the intermediate shaft cluster, meshing with adjacent gears to maintain synchronized speed ratios during load shifts. The spur gear’s straight-cut teeth ensure minimal axial thrust, making it ideal for high-torque applications in industrial drivetrains. When paired with a robust TRANSMISSION HOUSING, this component maintains proper gear alignment and reduces vibration under heavy loads.

Symptoms of Failure

• Whining or grinding noise during gear engagement: Worn spur gear teeth produce a distinct metallic whine, especially under acceleration or deceleration, indicating surface fatigue or pitting.
• Intermittent gear slippage under load: As the gear profile wears, it loses its ability to maintain positive engagement, causing momentary power loss when climbing or hauling.
• Metal particles in transmission fluid: Flaking or chipped teeth generate ferrous debris that contaminates the oil, often visible during routine drain intervals.
• Vibration through the shift lever or chassis: Uneven tooth wear creates imbalance in the rotating assembly, transmitting noticeable tremors through the driveline.

Technical Specifications

Compatibility

This spur gear is a direct-fit component for the ZF WG 100 Series transmission family, including models WG100, WG120, and WG150. It also serves as a replacement part in select WG180 and WG200 variants that share the same intermediate shaft cluster design. The gear interfaces with the HOUSING (part 4651301029) and the HOUSING (part 4651301024) to create a sealed gear chamber. A O-RING (0634303928) is required at the housing interface to prevent oil bypass. Always verify your transmission serial number against ZF application charts before ordering.

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