ZF 4644.221.194 TUBE for WG200 | OEM Genuine Part

Overview

The ZF 4644.221.194 TUBE for WG200 is a precision-engineered hydraulic fluid conduit designed to maintain consistent oil pressure and flow within the transmission’s valve body circuit. This OEM genuine part sits between the 4644105424: DISCONNECTION assembly and the main TRANSMISSION HOUSING, ensuring uninterrupted lubrication and clutch application. Manufactured to ZF’s exacting tolerances, SKU 4644.221.194 is critical for maintaining shift quality and thermal stability in heavy-duty WG200 series units.

Symptoms of Failure

• Hydraulic fluid seepage at tube junctions – Cracks or corrosion in the tube body often cause slow oil leaks around the HEXAGON SCREW mounting points, leading to low fluid levels and erratic gear engagement.
• Delayed or harsh shifting under load – A compromised tube disrupts oil delivery to the clutch packs, resulting in noticeable shift shock or hesitation when accelerating.
• Overheating transmission oil – Restricted flow through a deformed or blocked tube reduces cooling efficiency, triggering thermal warnings or burnt fluid odor.
• Intermittent loss of drive in forward gears – Severe tube fatigue can cause sudden pressure drops, causing the transmission to momentarily slip out of gear during operation.

Technical Specifications

Compatibility

This tube is specifically designed for the ZF WG200 series, including WG200, WG180, and WG150 variants used in off-highway trucks, wheel loaders, and agricultural tractors. It directly interfaces with the OUTPUT FLANGE oil gallery and the valve block assembly. Always verify your transmission’s serial number before ordering, as minor revisions exist between early and late production units.

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