ZF 4642.306.167 ORIFICE for WG65 | OEM Genuine Part

Overview

The ZF 4642.306.167 ORIFICE is a precision-machined hydraulic flow restrictor engineered specifically for the WG 65 series transmission. This OEM genuine part regulates oil pressure and flow within the valve body assembly, ensuring precise clutch pack engagement and smooth gear transitions. Positioned within the main control circuit, the orifice maintains consistent lubrication and cooling to critical rotating components. The SKU 4642.306.167 is a direct replacement for original factory-installed units, guaranteeing exact dimensional tolerances and material composition. When paired with a properly sealed TRANSMISSION HOUSING, this orifice prevents pressure loss that can degrade shift quality over time.

Symptoms of Failure

• Delayed or harsh shifting: A worn or clogged orifice disrupts hydraulic timing, causing sluggish engagement or abrupt gear changes.
• Erratic clutch pack behavior: Inconsistent oil flow leads to clutch slip under load, often accompanied by elevated transmission temperatures.
• Low line pressure readings: A damaged orifice fails to maintain backpressure, triggering diagnostic trouble codes for insufficient hydraulic pressure.
• Oil contamination in valve body: Debris bypassing a degraded orifice can circulate through the system, accelerating wear on adjacent components like the HEXAGON SCREW fasteners securing the valve body.

Technical Specifications

Compatibility

This orifice is a standard component across the ZF WG series, including models WG65, WG120, WG180, and WG200. It is also found in certain off-highway variants such as the WG 65-2 and WG 65-3. The part interfaces directly with the HOUSING (4616301307) and HOUSING (4616301309) assemblies, where it meters oil flow to the clutch piston circuits. Always verify your transmission serial number against ZF application charts before ordering.

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