ZF 4642.308.551 SPUR GEAR for WG150 | OEM Genuine Part

Overview

The ZF 4642.308.551 SPUR GEAR is a precision-machined component engineered for the WG150 series transmission. This gear sits within the planetary gearset assembly, where it transfers rotational torque between shafts to facilitate smooth ratio changes under heavy load. As an OEM genuine part, the SKU 4642.308.551 ensures exact fitment and metallurgical consistency with the original transmission design. This spur gear is critical for maintaining synchronized power flow in construction and agricultural machinery applications.

Symptoms of Failure

• Whining or grinding noise during gear engagement: Worn teeth on the spur gear produce a high-pitched metallic sound, especially under acceleration or deceleration.
• Intermittent power loss or gear slippage: As the gear surface degrades, the transmission may fail to hold torque, causing sudden rpm spikes without corresponding vehicle speed increase.
• Metal debris in transmission fluid: Flaking or pitting of the gear material contaminates the oil, often visible as glitter-like particles during routine fluid changes.
• Hard shifting or delayed engagement: A damaged spur gear disrupts the timing of clutch packs, leading to rough or delayed shifts between forward and reverse.

Technical Specifications

Compatibility

This spur gear is primarily designed for the ZF WG150 transmission series. It also fits select variants of the WG180 and WG200 models where the planetary gearset shares identical tooth geometry and shaft spacing. Always verify the bore diameter and tooth count against your existing assembly before installation. The gear interfaces directly with the 4642101109: TRANSMISSION HOUSING and the 4642301205: TRANSMISSION HOUSING to maintain proper axial alignment. Additionally, the 0730365125: TYPE PLATE provides identification data for the assembly, while the 0631311009: GROOVED STUD secures the gear cluster within the housing.

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