ZF 4475.280.081 ADAPTER | OEM Genuine Part

Overview

The ZF 4475.280.081 ADAPTER is a precision-machined component designed to interface critical hydraulic and mechanical assemblies within ZF heavy-duty powershift transmissions. Positioned between the main housing and valve body, this OEM genuine part ensures correct fluid routing and structural alignment. The SKU 4475.280.081 is manufactured to original ZF tolerances, making it essential for maintaining proper clutch engagement and pressure regulation in construction machinery drivetrains. When replacing this adapter, it is common to also inspect the adjacent 4143101009 HOUSING for wear, as both components share a sealed interface.

Symptoms of Failure

• Hydraulic fluid seepage at adapter joint – A worn or cracked adapter allows oil to bypass the sealing surfaces, leading to visible drips on the transmission casing. This often accompanies a degraded 0634313603 O-RING.
• Erratic gear engagement under load – Loss of pressure integrity through a damaged adapter causes delayed or harsh shifting, particularly in WG-series transmissions used in wheel loaders.
• Contaminated transmission fluid – Cracks in the adapter body can permit debris ingress, accelerating wear on internal valves and the 4143301025 HOUSING.
• Reduced torque converter lockup – A failing adapter disrupts pilot pressure signals, resulting in inefficient power transfer and elevated operating temperatures.

Technical Specifications

Compatibility

This adapter is engineered for ZF powershift transmissions commonly found in construction machinery. It is directly compatible with the following models:

• ZF WG180
• ZF WG200
• ZF WG210
• ZF 4WG-200
• ZF 5WG-180

During installation, always replace the 4475280018 SCREW PLUG to ensure proper torque retention and sealing of the adapter bore.

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