ZF 4475.280.109 CONNECTING PART | OEM Genuine Part

Overview

The ZF 4475.280.109 CONNECTING PART is a precision-machined OEM genuine component engineered for the hydraulic control circuit within ZF heavy-duty construction machinery transmissions. This part serves as a critical fluid transfer interface, linking the main valve body to the clutch housing assembly. It ensures correct oil flow direction and pressure integrity during gear engagement cycles. The SKU 4475.280.109 is designed to withstand high cyclic loads and thermal expansion in demanding off-highway applications. When installed, it mates directly with the 4143101016 HOUSING and the 4143301039 HOUSING to form a sealed pressure gallery.

Symptoms of Failure

• Hydraulic pressure drop during clutch engagement – A worn or cracked connecting part causes internal leakage, leading to soft shifts or delayed gear engagement under load.
• External oil seepage at the transmission housing joint – Deterioration of the sealing surface results in visible oil leaks around the mating flange, often mistaken for a gasket failure.
• Erratic transmission response in cold start conditions – When the connecting part loses dimensional stability, cold oil bypasses the intended circuit, causing harsh or incomplete shifts.
• Contaminated transmission fluid with metallic debris – Fractures in the part can shed aluminum or steel particles into the oil, accelerating wear on downstream components like the 4143201019 VALVE INSERT.

Technical Specifications

Compatibility

This connecting part is designed for use in ZF WG180, WG200, and WG211 series powershift transmissions commonly found in wheel loaders, graders, and dozers. It is also compatible with certain ZF Ecomat 4HP/5HP variants used in construction machinery. Always verify fitment by cross-referencing the part number with your transmission serial plate. For proper installation, pair this part with a new 0501318136 GASKET and secure it using 0636101084 CAP SCREW fasteners torqued to 45 Nm.

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