ZF 0501.321.417 CUP SPRING for WG90/WG94 | OEM Genuine Part

Overview

The ZF 0501.321.417 CUP SPRING is a precision-engineered OEM genuine component designed for the WG90 and WG94 transmission series. This critical spring element sits within the hydraulic control assembly, providing the necessary preload force to maintain consistent pressure on a sealing piston or valve spool. By ensuring a constant clamping force, the cup spring prevents unwanted movement and maintains hydraulic integrity during gear shifts. The SKU 0501.321.417 is a direct factory replacement, guaranteeing exact fitment and material hardness to match original ZF specifications.

Symptoms of Failure

When the 0501.321.417 cup spring fatigues or loses its tension, operators often notice specific operational issues. Delayed or harsh gear engagement is a primary symptom, as the spring can no longer hold the valve in its correct position. Intermittent loss of hydraulic pressure may occur, leading to erratic shifting under load. Another common failure sign is audible clicking or rattling from the valve body area during neutral-to-drive transitions. Finally, unexpected transmission slippage at low RPM can indicate that the spring is no longer providing adequate preload to the clutch control circuit.

Technical Specifications

Compatibility

This cup spring is engineered for the ZF WG90 and WG94 series transmissions, commonly found in medium-duty commercial vehicles and industrial machinery. It also fits select variants of the WG180 and WG200 models where the valve body architecture uses the same spring pocket dimensions. Always verify the spring seat depth in your specific transmission housing before installation. The spring interfaces directly with the 4661101001 TRANSMISSION HOUSING and is retained by the 0631306174 CYLINDRICAL PIN. During rebuilds, inspect the 4661301007 HOUSING for wear at the spring contact point, and ensure the 4661301093 TUBE is free of debris that could affect spring compression.

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