ZF 0501.338.613 WOODRUFF KEY | OEM Genuine Part

Overview

The ZF 0501.338.613 WOODRUFF KEY is a precision-machined OEM genuine part engineered to secure rotating components within ZF powershift transmissions. This half-moon shaped key fits into a keyseat on the shaft and a corresponding slot in the hub of a gear or pulley, preventing relative rotation and ensuring positive torque transfer. Specifically, the 0501.338.613 Woodruff Key is critical for locking the 4699102106: INPUT shaft assembly to its mating gear within the transmission housing. Without this small but vital component, the driveline would lose synchronization, leading to catastrophic internal damage. As an OEM genuine part, it meets ZF’s exacting metallurgical and dimensional standards for long service life in heavy construction machinery.

Symptoms of Failure

When the ZF 0501.338.613 Woodruff Key begins to fail, operators will notice distinct performance issues. The most common symptoms include:

• Transmission gear slipping under load: A worn or sheared key allows the gear to rotate independently on the shaft, causing sudden loss of drive torque, especially when climbing grades or moving heavy loads.
• Metallic clicking or knocking from the transmission housing: As the key degrades, the gear hub impacts the shaft keyseat, producing a rhythmic noise that increases with engine RPM.
• Erratic engagement of forward or reverse gears: If the key fails on the 4699103123: OUTPUT shaft, the transmission may struggle to hold gear engagement, resulting in delayed or jerky shifts.
• Metal debris in the transmission oil filter: Sheared key fragments contaminate the lubrication system, often detected during routine oil analysis or filter inspection.

Technical Specifications

Compatibility

This Woodruff Key is an integral component in several ZF heavy-duty transmission models used in construction machinery. It is commonly found in the WG180, WG200, and WG250 series powershift transmissions. Additionally, it is used in the 4WG200 and 5WG200 variants. The key interfaces directly with the 4699101153: HOUSING assembly and the 4699025161: GP25 planetary gear set. Always verify the shaft keyseat dimensions before installation to ensure a proper interference fit.

Related Components