ZF 4644.131.038 FILLER NOZZLE for WG200 | OEM Genuine Part

Overview

The ZF 4644.131.038 FILLER NOZZLE is a precision-engineered fluid delivery component designed exclusively for the WG 200 series powershift transmission. This OEM genuine part, identified by SKU 4644.131.038, functions as the primary oil fill point, directing hydraulic fluid into the transmission sump while preventing debris ingress. Mounted on the upper housing assembly, it works in concert with the 4460115043: HOUSING to maintain proper fluid levels during service intervals. The nozzle’s internal geometry ensures laminar flow, reducing aeration and cavitation risks in high-torque applications.

Symptoms of Failure

• Hydraulic fluid seepage around the fill port – Cracks or deformation in the nozzle body cause slow oil leaks, often mistaken for a loose cap.
• Transmission overheating during heavy load – A blocked or collapsed filler nozzle restricts oil flow, leading to inadequate lubrication and thermal runaway.
• Contaminated oil entering the gear train – A degraded seal at the nozzle base allows dirt and moisture to bypass the filter, accelerating wear on the 0750117406: TAPER ROLLER BEARING.
• Erratic gear engagement under load – Air ingestion through a cracked nozzle disrupts hydraulic pressure, causing delayed or harsh shifting in WG200 transmissions.

Technical Specifications

Compatibility

This filler nozzle is engineered for the ZF WG 200 series, including the WG180, WG200, and WG210 models used in off-highway vehicles and heavy equipment. It directly interfaces with the 4469315012: AXLE DRIVE HOUSING and supports the 0750117802: TAPERED ROLLER BEARING assembly by ensuring consistent oil delivery to the differential gearset. Always verify your transmission’s serial number against ZF’s parts catalog before installation.

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