ZF 4644.306.591 COVER for WG 180/WG 200 | OEM Genuine Part

Overview

The ZF 4644.306.591 COVER is a precision-engineered sealing component designed for the WG 180 and WG 200 series transmissions. This OEM genuine part serves as the protective enclosure for the transmission’s hydraulic control unit, securing internal components against contamination while maintaining critical oil pressure. Positioned on the side of the main gearbox housing, this cover interfaces directly with the TRANSMISSION HOUSING (4642101109) and the TRANSMISSION HOUSING (4642301205) to form a sealed assembly. The SKU 4644.306.591 is a direct replacement for original factory equipment, ensuring exact fitment and material compatibility.

Symptoms of Failure

• Hydraulic fluid seepage around the cover perimeter – A worn gasket or cracked cover allows oil to escape, leading to low fluid levels and erratic shifting.
• Transmission overheating due to pressure loss – A compromised cover reduces internal hydraulic pressure, causing the torque converter to slip and generate excess heat.
• Contaminant ingress causing gear engagement delays – When the cover fails to seal, dirt and debris enter the valve body, resulting in harsh or delayed shifts.
• Visible corrosion or deformation on the cover surface – Repeated thermal cycling can warp the metal, creating gaps that accelerate wear on the TYPE PLATE (0730365125) and adjacent fasteners.

Technical Specifications

Compatibility

This cover is engineered for the ZF WG 150 series, WG 180, and WG 200 transmission families. It directly replaces the original cover on WG 180 and WG 200 models used in heavy-duty trucks, construction equipment, and agricultural machinery. The part also fits select WG 150 variants when paired with the correct GROOVED STUD (0631311009) kit. Always verify your transmission’s serial number against the OEM parts catalog before installation.

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