ZF 4616.221.057 TUBE for WG65 | OEM Genuine Part

Overview

The ZF 4616.221.057 TUBE is a critical fluid conduit engineered specifically for the WG 65 series transmission. This OEM genuine part channels pressurized hydraulic oil between the valve body and the clutch drum assembly, ensuring precise shift timing and consistent lubrication under heavy-duty cycles. As a direct-fit replacement, the 4616.221.057 tube eliminates bypass leakage that degrades transmission performance. This component is secured within the main casing, often requiring removal of the TRANSMISSION HOUSING for access during rebuilds. Its seamless construction resists fatigue from thermal expansion, making it a cornerstone of reliable WG65 operation.

Symptoms of Failure

• External hydraulic oil seepage at the tube junction — Cracked or deformed tube ends cause fluid to weep onto the bell housing, often mistaken for a pan gasket leak.
• Delayed or harsh gear engagement — A compromised tube reduces line pressure to the clutch pack, resulting in sluggish shifts or sudden engagement under load.
• Erratic shift patterns during low-speed maneuvering — Internal restriction from debris or kinking disrupts pilot pressure, causing the transmission to hunt between gears.
• Accumulated metallic debris in the filter — Tube wall erosion sheds particles into the circuit, accelerating wear on the FILTER INSERT and valve body.

Technical Specifications

Compatibility

This tube is dimensionally validated for the ZF WG65 series, including the WG65, WG65-2, and WG65-3 variants. It also retrofits into earlier WG180 and WG200 models when used with the corresponding HEXAGON SCREW 0636011038 and HEXAGON SCREW 0636011118 for bracket alignment. For WG250 and WG300 applications, verify the tube routing against the HEXAGON SCREW 0636016015 mounting points. Always pair replacement with fresh O-RING 0634303718 and a SEALING RING 0634801152 to prevent cross-threading.

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