ZF 4651.221.022 TUBE for WG100 | OEM Genuine Part

Overview

The ZF 4651.221.022 TUBE for WG100 is a precision-engineered fluid conduit designed to direct pressurized oil within the transmission’s hydraulic control system. This OEM genuine part, identified by SKU 4651.221.022, sits between the valve body and the clutch pack assembly, ensuring consistent lubrication and cooling flow. Constructed from high-strength steel, it withstands extreme thermal cycling and vibration. When paired with a properly sealed TRANSMISSION HOUSING, this tube maintains critical pressure thresholds for smooth gear engagement in WG 100 Series units.

Symptoms of Failure

• Hydraulic oil seepage around the tube ends – A worn 4651.221.022 tube often develops micro-cracks, causing visible fluid drips near the bell housing. This is a common search query for “ZF WG100 oil leak at tube connection.”
• Delayed or harsh gear shifts – When the tube loses structural integrity, hydraulic pressure drops, leading to “ZF transmission slipping under load” or “hard shifting in WG100.”
• Overheating transmission fluid – Restricted flow through a deformed tube reduces cooling capacity, triggering “transmission overtemp warning” on diagnostic tools.
• Audible whining or groaning – Air entrainment from a compromised tube creates cavitation noise, often described as “ZF WG100 whining during acceleration.”

Technical Specifications

Compatibility

This tube is engineered for the ZF WG 100 Series, specifically the WG100, WG120, and WG150 models. It also fits select WG180 and WG200 variants when used with the correct HOUSING adapter. For WG200 applications, verify that the HOUSING part 4651301013 is installed to ensure proper alignment. The 4651.221.022 is not compatible with WG 80 or older ZF Ecomat series without major modifications.

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