ZF 4646.151.422 COUPLING for WG 250/WG 260/WG 310 | OEM Genuine Part

Overview

The ZF 4646.151.422 COUPLING is a critical OEM genuine component engineered specifically for the WG 250, WG 260, and WG 310 transmission series. This precision-machined coupling serves as the primary torque transfer interface between the engine output shaft and the transmission input assembly, ensuring smooth power delivery under heavy-duty industrial loads. The SKU 4646.151.422 is manufactured to ZF’s exacting tolerances, providing a direct bolt-on replacement that eliminates driveline vibration and maintains optimal gear engagement. This part sits directly within the bell housing area, where it interfaces with the TRANSMISSION HOUSING and the HOUSING to form a sealed, lubricated assembly.

Symptoms of Failure

• Torque converter shudder during acceleration: A worn 4646.151.422 coupling causes noticeable vibration or jerking when the transmission shifts from first to second gear, particularly under load.
• Oil seepage at the bell housing joint: Degraded coupling seals allow transmission fluid to leak past the COVER interface, leaving visible drips on the underside of the chassis.
• Metallic grinding noise at idle: Loose or fatigued coupling splines produce a distinct chatter that intensifies when the transmission is in neutral with the engine running.
• Delayed engagement when shifting from Park to Drive: Internal wear on the coupling hub causes a 2-3 second lag before power is transmitted to the wheels.

Technical Specifications

Compatibility

This coupling is designed for the ZF WG series of powershift transmissions. It is a direct fit for the WG 250, WG 260, and WG 310 models commonly found in construction equipment, agricultural tractors, and material handling machinery. The part also retrofits to earlier WG 180 and WG 200 variants when used with the appropriate HEXAGON SCREW kit. Always verify your transmission serial number before installation to ensure correct spline engagement.

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