ZF 4644.320.044 THREADED BUSH for WG210 | OEM Genuine Part

Overview

The ZF 4644.320.044 THREADED BUSH is a precision-engineered component designed specifically for the WG 210 Series transmission. This OEM genuine part functions as a threaded insert within the transmission housing assembly, providing a durable, wear-resistant interface for securing bolts and maintaining structural integrity under high torque loads. The SKU 4644.320.044 is critical for ensuring proper alignment and clamping force in the gearbox, preventing loosening of adjacent components during operation. It sits directly within the TRANSMISSION HOUSING, where it interacts with the HOUS.FRONT SECT and the HOUSING REAR PART to maintain a rigid assembly. Without this threaded bush, the transmission’s casing would be vulnerable to stress fractures and misalignment.

Symptoms of Failure

When the ZF 4644.320.044 threaded bush wears out, operators may notice several distinct failure indicators. Oil seepage around the housing joint is a common early sign, as a damaged bush compromises the seal between the TRANSMISSION HOUSING and the HOUS.FRONT SECT. Gear slipping under load can occur when the bush loses its thread integrity, allowing bolts to back out and reducing clamping force. Unusual vibration or knocking noises from the transmission bell housing often indicate that the bush has stripped or deformed, leading to play in the assembly. Finally, difficulty in bolt torquing during maintenance—where fasteners fail to reach specified torque values—points directly to a worn 4644.320.044 threaded bush that requires immediate replacement.

Technical Specifications

Compatibility

This threaded bush is engineered for the ZF WG 210 Series transmission, but it also fits select models within the broader WG family. Compatible transmissions include the WG180, WG200, WG210, and WG250 series, where it serves as a direct replacement for the OEM part. The 4644.320.044 is also used in certain ZF Ecomat and Ecolife variants that share the same housing architecture. Always verify fitment by cross-referencing the part number with your transmission’s serial number, as the bush interfaces with the CYLINDRICAL PIN and other locating features within the housing.

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