ZF 4651.321.010 TUBE for WG100 | OEM Genuine Part

Overview

The ZF 4651.321.010 TUBE for WG100 is a precision-engineered fluid conduit designed to maintain consistent hydraulic pressure within the transmission’s lubrication and cooling circuits. Positioned between the valve body and the rotating clutch drum assembly, this OEM genuine part ensures uninterrupted oil flow to critical friction surfaces. The SKU 4651.321.010 is manufactured to ZF’s exacting tolerances, preventing cross-threading and vibration-induced loosening during high-torque operation. This tube works in concert with the TRANSMISSION HOUSING (4651101009) and the HOUSING (4651301025) to create a sealed pressure boundary.

Symptoms of Failure

• External oil seepage at tube-to-housing interface: A worn or cracked 4651.321.010 tube allows pressurized ATF to escape, leaving visible drips under the bell housing area.
• Delayed gear engagement or slipping: Insufficient hydraulic pressure due to a compromised tube causes soft shifts or momentary loss of drive in forward gears.
• Whining or cavitation noise from transmission sump: Air ingestion through a damaged tube creates a high-pitched whine, especially during cold starts or under load.
• Overheating transmission fluid: Restricted flow through a deformed tube reduces cooler circuit efficiency, triggering thermal warning lights on heavy equipment.

Technical Specifications

Compatibility

This tube is specifically designed for the ZF WG 100 series transmissions, including the WG100, WG120, and WG150 models used in medium-duty trucks and construction equipment. It also retrofits to certain WG180 and WG200 variants when paired with the correct HOUSING (4651301031). Always verify the tube’s routing path against your transmission’s hydraulic schematic before installation.

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