ZF 4646.337.018 HUB for WG250 | OEM Genuine Part

Overview

The ZF 4646.337.018 HUB is a precision-machined component engineered for the WG250 series of heavy-duty powershift transmissions. This OEM genuine part functions as the central rotational interface between the planetary gear set and the output shaft, ensuring torque transfer remains stable under extreme load conditions. The SKU 4646.337.018 is specifically designed to fit within the main drive assembly, where it interfaces directly with the TRANSMISSION HOUSING and the HOUSING to maintain concentric alignment. Without this hub, the transmission cannot properly distribute power from the converter to the final drive, making it a critical wear item for any WG250 rebuild or overhaul.

Symptoms of Failure

• Oil leaks near the output shaft seal – When the 4646.337.018 hub wears, the sealing surface becomes scored, allowing transmission fluid to weep past the seal. This is a common long-tail search query for “ZF WG250 hub oil leak repair.”
• Gear slipping under load – A worn hub causes excessive axial play, leading to intermittent disengagement of the clutch packs. Operators often report “transmission slipping in forward gears” as the first sign of hub fatigue.
• Metallic grinding noise during shifting – As the hub splines wear, they produce a distinct grinding sound, particularly when shifting from neutral to drive. This symptom is frequently searched as “ZF transmission grinding noise fix.”
• Vibration at highway speeds – Imbalance from a damaged hub creates driveline vibration that intensifies above 40 mph, often misdiagnosed as a driveshaft issue.

Technical Specifications

Compatibility

This hub is primarily designed for the ZF WG250 series, but it also fits select models in the WG180, WG200, and WG210 families due to shared spline geometry and bearing journal dimensions. It is a direct replacement for transmissions used in agricultural tractors, wheel loaders, and industrial forklifts. Always verify the hub’s fitment against the COVER and the CONNECTING PART to ensure proper assembly clearance. For WG250 variants built after 2015, confirm the serial number prefix matches the updated hub profile.

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