ZF 4651.321.009 TUBE for WG100 | OEM Genuine Part

Overview

The ZF 4651.321.009 TUBE for WG100 is a precision-engineered hydraulic fluid conduit designed to maintain correct oil flow and pressure within the transmission valve body assembly. This OEM genuine part, identified by SKU 4651.321.009, directs transmission fluid to critical lubrication points and clutch packs in the WG 100 Series. It sits between the main TRANSMISSION HOUSING and the upper valve body, ensuring uninterrupted fluid delivery during gear shifts. Manufactured to ZF’s exacting tolerances, this tube prevents cross-leakage and supports consistent shift quality under heavy-duty operating conditions.

Symptoms of Failure

• External fluid seepage around the tube connection points – A worn or cracked 4651.321.009 tube often produces visible oil drips near the transmission housing, leading to low fluid levels and potential overheating.
• Erratic or delayed gear engagement – When this tube loses its seal, hydraulic pressure drops, causing sluggish shifts or slipping between gears, especially under load.
• Whining or humming noise from the transmission – Restricted fluid flow through a damaged tube creates cavitation, resulting in audible whining that intensifies during acceleration.
• Burnt transmission fluid odor – Insufficient lubrication from a compromised tube raises internal temperatures, producing a distinct burnt smell from degraded ATF.

Technical Specifications

Compatibility

This genuine ZF tube is primarily designed for the WG 100 Series transmissions, including models WG100, WG120, and WG150. It also fits select variants of the WG180 and WG200 series where the valve body layout matches the WG100 architecture. The part interfaces directly with the HOUSING (4651301025) and the HOUSING (4651301031) assemblies. Always verify your transmission’s serial number against ZF’s compatibility charts before installation.

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