ZF 4166.332.288 CIRCUIT COVER for WG200 | OEM Genuine Part

Overview

The ZF 4166.332.288 CIRCUIT COVER is a critical sealing component designed for the WG 200 series of powershift transmissions. This OEM genuine part encloses the hydraulic control circuit within the valve body assembly, ensuring that pressurized transmission fluid is directed precisely to clutches and brakes for smooth gear engagement. Positioned directly against the transmission housing, the circuit cover prevents contamination ingress and maintains system pressure integrity. The SKU 4166.332.288 is engineered to ZF’s exacting tolerances, making it a direct replacement for worn or damaged covers in heavy-duty off-highway equipment.

Symptoms of Failure

When the ZF 4166.332.288 CIRCUIT COVER degrades, operators may notice specific performance issues. External transmission fluid leaks often appear around the valve body mating surface, leaving visible drips on the bell housing. Erratic or delayed gear engagement occurs as hydraulic pressure bleeds past the compromised cover, causing clutch pack slip. Contaminated transmission oil from debris entering through a cracked cover accelerates wear on internal components. Overheating of the transmission can result from insufficient hydraulic pressure, leading to increased friction and thermal stress during operation.

Technical Specifications

Compatibility

This circuit cover is primarily designed for the ZF WG 200 series transmissions, including models such as the WG180, WG200, and WG210. It is also compatible with select variants of the WG 150 series where the valve body configuration matches. The part interfaces directly with the TRANSMISSION HOUSING and secures the hydraulic circuit that connects to the DISCONNECTION assembly. For complete installation, the cover is fastened using the HEXAGON SCREW and seals against the OUTPUT FLANGE area to prevent fluid migration.

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