ZF 4644.302.209 OIL FEED FLANGE for WG181 | OEM Genuine Part

Overview

The ZF 4644.302.209 OIL FEED FLANGE is a precision-engineered component designed for the WG 181 series transmission. This OEM genuine part functions as the critical interface that directs pressurized hydraulic fluid from the pump to the valve body and clutch assemblies. Positioned on the side of the main casing, the oil feed flange ensures a sealed, uninterrupted flow of lubricant and cooling oil to rotating components. The SKU 4644.302.209 is manufactured to ZF’s exacting tolerances, guaranteeing proper alignment with the TRANSMISSION HOUSING and the HOUSING assembly. Without this flange, the transmission cannot maintain adequate oil pressure for gear engagement.

Symptoms of Failure

• External oil seepage around the flange mating surface — A worn gasket or cracked flange often causes visible drips near the transmission side cover, leading to low fluid levels and eventual overheating.
• Delayed or harsh gear engagement — Insufficient oil feed pressure results in sluggish shifts, particularly when moving from neutral to drive or reverse.
• Whining or humming noise during operation — Air ingestion through a compromised flange creates cavitation in the oil pump, producing audible metallic sounds.
• Burnt transmission fluid odor — Reduced oil flow causes clutch pack overheating, which accelerates fluid degradation and produces a distinct burnt smell.

Technical Specifications

Compatibility

This oil feed flange is specifically engineered for the ZF WG 181 series, but it also fits select models in the WG 180, WG 190, and WG 200 families due to shared hydraulic circuit architecture. It is commonly used in ZF 6WG180, 6WG200, and 6WG210 transmissions found in municipal buses, fire trucks, and heavy-duty construction vehicles. Always verify the TYPE PLATE on your transmission to confirm compatibility before installation. The flange interfaces directly with the THREADED BUSH that secures the oil gallery.

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