ZF 4644.152.123 COUPLING for WG 180/WG 200 | OEM Genuine Part

Overview

The ZF 4644.152.123 COUPLING is a critical driveline component engineered specifically for the WG 180 and WG 200 transmission series. This OEM genuine part serves as the primary torque transfer interface between the engine output and the transmission input shaft, ensuring smooth power delivery and dampening torsional vibrations. Positioned directly behind the flexplate assembly, this coupling absorbs rotational shocks that would otherwise stress internal planetary gear sets. The SKU 4644.152.123 is precision-machined to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty industrial applications. When paired with a robust TRANSMISSION HOUSING, this coupling maintains proper alignment and load distribution across the entire drivetrain.

Symptoms of Failure

• Torque converter shudder during acceleration: A worn 4644.152.123 coupling often produces a pronounced vibration or “chatter” when the transmission shifts from neutral to drive under load, indicating spline wear or elastomeric degradation.
• Transmission fluid contamination with metallic particles: As the coupling’s internal splines wear, fine steel debris enters the hydraulic circuit, often detected during routine oil analysis or when draining the pan.
• Delayed engagement or gear slipping under heavy load: A failing coupling cannot transmit full engine torque, causing the WG 200 series transmission to hesitate before engaging forward or reverse gears, particularly on inclines.
• Audible knocking from the bell housing area: Excessive clearance between the coupling and the TRANSMISSION HOUSING creates a rhythmic metallic tapping sound that increases with engine RPM.

Technical Specifications

Compatibility

This coupling is designed for the ZF WG 180 and WG 200 series transmissions, which are widely used in municipal buses, fire trucks, and heavy construction equipment. It directly replaces the original coupling in WG 180-6, WG 200-6, and WG 200-8 models manufactured between 2005 and 2023. The part also fits select WG 160 variants when used with an adapter sleeve. Always verify the transmission serial number against the TYPE PLATE to ensure correct fitment. For secure mounting, the coupling requires four GROOVED STUD fasteners, which should be replaced simultaneously to maintain torque specifications.

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