ZF 4660.221.013 TUBE for WG98 | OEM Genuine Part

Overview

The ZF 4660.221.013 TUBE for WG98 is a precision-engineered fluid conduit designed to maintain proper hydraulic pressure and lubrication flow within the transmission assembly. This OEM genuine part, identified by SKU 4660.221.013, sits between the valve body and the main housing, directing transmission fluid to critical clutch packs and planetary gearsets. As an integral component of the WG 98 Series, this tube ensures consistent oil delivery under high thermal loads, preventing premature wear on adjacent assemblies such as the TRANSMISSION HOUSING and the HOUSING II. Without this tube, the transmission cannot maintain proper hydraulic circuit integrity.

Symptoms of Failure

• External oil seepage around the tube connection points – Cracked or deformed tubes allow ATF to escape, leading to low fluid levels and eventual gear slipping under load.
• Delayed or harsh shifting – A compromised tube disrupts line pressure, causing erratic clutch engagement and noticeable shift shock during acceleration.
• Transmission overheating – Restricted fluid flow through a damaged tube reduces cooling capacity, triggering thermal warnings or burnt fluid odor.
• Whining or humming noise from the transmission – Air ingestion through a fractured tube creates cavitation, producing audible noise that worsens with RPM increase.

Technical Specifications

Compatibility

This tube is specifically engineered for the ZF WG 98 Series transmissions, including models such as WG180, WG200, and WG210. It also fits select WG 98 variants used in off-highway vehicles and industrial machinery. For proper installation, ensure the CYLINDRICAL PIN is correctly aligned to prevent tube distortion, and verify the TYPE PLATE matches your transmission model before ordering. Always replace the mating O-rings and cap screws when servicing this tube.

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