ZF 4475.280.116 SCREW-IN SLEEVE for WG250 | OEM Genuine Part

Overview

The ZF 4475.280.116 SCREW-IN SLEEVE is a precision-machined OEM genuine component engineered for the WG250 series transmission. This threaded sleeve serves as a critical sealing and alignment interface within the hydraulic control circuit, typically positioned between the TRANSMISSION HOUSING and the valve body assembly. Its primary function is to maintain consistent oil pressure by preventing cross-port leakage while providing a secure mounting point for adjacent hydraulic lines. The SKU 4475.280.116 is manufactured to ZF’s exacting tolerances, ensuring a leak-free fit that directly supports clutch engagement timing and shift quality in heavy-duty applications.

Symptoms of Failure

• External oil seepage at the housing interface: A worn or cracked screw-in sleeve allows transmission fluid to escape around the threaded bore, often visible as wet spots near the HOUSING joint.
• Erratic gear engagement under load: When the sleeve loses its sealing integrity, hydraulic pressure drops, causing delayed or harsh shifts—particularly in the 2-3 and 3-4 upshifts.
• Contaminated fluid from metal debris: A failing sleeve can shed microscopic particles into the oil circuit, leading to premature wear of the COVER gasket surfaces and valve body bores.
• Audible whining from the pump area: Air ingestion through a compromised sleeve creates cavitation noise, often mistaken for pump failure.

Technical Specifications

Compatibility

This screw-in sleeve is primarily designed for the WG250 transmission series, but it also fits select variants of the WG180, WG200, and WG300 models that share the same hydraulic control module architecture. Always verify the thread pitch and housing bore depth against your specific transmission tag. The sleeve interfaces directly with the HEXAGON SCREW that secures the pressure regulator valve, and it must be replaced whenever the TRANSMISSION HOUSING is serviced for bore wear.

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