ZF 4646.151.423 COUPLING for WG 250/WG 260/WG 310 | OEM Genuine Part

Overview

The ZF 4646.151.423 COUPLING is a critical torque-transfer component engineered for the WG 250, WG 260, and WG 310 series transmissions. This OEM genuine part acts as the mechanical link between the engine output and the transmission input shaft, ensuring smooth power delivery and dampening torsional vibrations. The SKU 4646.151.423 is precision-machined to ZF’s exacting tolerances, making it essential for maintaining driveline integrity in heavy-duty industrial applications. When installed alongside the 4646101040: TRANSMISSION HOUSING, this coupling forms the core of the rotating assembly, while the 4646301090: HOUSING provides structural support for the coupling’s seating area.

Symptoms of Failure

• Torque fluctuation under load: A worn 4646.151.423 coupling will cause intermittent power loss or surging during acceleration, often misdiagnosed as transmission slipping.
• Metallic clicking from the bell housing: Excessive play in the coupling splines produces a distinct clicking noise, especially when shifting between forward and reverse gears.
• Oil contamination with metallic debris: As the coupling wears, fine metal particles enter the transmission fluid, visible during routine oil changes as a silver or copper sheen.
• Vibration at specific RPM ranges: A degraded coupling loses its dampening capability, causing resonant vibrations between 1200–1800 RPM that transfer through the chassis.

Technical Specifications

Compatibility

This coupling is specifically designed for ZF’s WG series powershift transmissions. It is a direct replacement for the following models: WG 250, WG 260, and WG 310. The part also fits select WG 180 and WG 200 variants when used with the appropriate 4646301240: COVER and 0636015304: HEXAGON SCREW kit. Always verify your transmission serial number before ordering to ensure correct spline engagement.

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