ZF 4644.131.009 FILLER NOZZLE for WG180 | OEM Genuine Part

Overview

The ZF 4644.131.009 FILLER NOZZLE is a precision-engineered fluid delivery component designed specifically for the WG 180 series of heavy-duty transmissions. This OEM genuine part serves as the critical interface for introducing transmission oil into the hydraulic system, ensuring proper lubrication and cooling of internal assemblies. Mounted directly onto the TRANSMISSION HOUSING, the filler nozzle directs fluid flow without turbulence or aeration. The SKU 4644.131.009 is manufactured to ZF’s exacting tolerances, guaranteeing a secure seal and consistent oil delivery under high-pressure operating conditions.

Symptoms of Failure

• Transmission oil leaks at the filler neck: A worn or cracked filler nozzle often causes visible fluid seepage around the fill port, leading to low oil levels and potential gear damage.
• Hard shifting or gear slipping during acceleration: When the nozzle fails to direct oil properly, hydraulic pressure drops, resulting in delayed engagement or slipping between gears.
• Overheating transmission due to insufficient lubrication: A compromised filler nozzle restricts oil flow, causing elevated operating temperatures and accelerated wear on clutch packs.
• Whining noise from the transmission pump: Air ingestion through a damaged nozzle creates cavitation, producing a distinct high-pitched sound during operation.

Technical Specifications

Compatibility

This filler nozzle is primarily engineered for the ZF WG 180 series transmissions, commonly found in municipal buses, construction vehicles, and medium-duty trucks. It also fits the WG 200 series and select WG 150 variants where the filler port geometry matches. The part integrates directly with the DISCONNECTION assembly and the OUTPUT FLANGE housing. For secure mounting, use the HEXAGON SCREW (M8 x 20mm) to fasten the nozzle to the transmission housing. Always verify your transmission model’s serial number before ordering.

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