ZF 0631.511.004 WOODRUFF KEY | OEM Genuine Part

Overview

The ZF 0631.511.004 WOODRUFF KEY is a precision-machined, semi-circular key used to secure rotating components to their shafts within ZF power shift transmissions. This OEM genuine part, identified by SKU 0631.511.004, prevents relative rotation between a gear or hub and the shaft, ensuring positive torque transfer. It is typically seated in a keyway on the shaft and mates with a corresponding slot in the mating part, such as a INPUT shaft assembly or an OUTPUT hub. Without this Woodruff key, the driveline cannot maintain proper alignment under load, making it a critical component for construction machinery transmissions.

Symptoms of Failure

• Intermittent gear slipping under load: A worn or sheared Woodruff key allows the gear to rotate slightly on the shaft, causing a loss of torque transfer that manifests as slipping during heavy digging or grading operations.
• Unusual knocking or clunking from the transmission housing: When the key fails, the loose component can impact the HOUSING interior, producing a distinct metallic noise during acceleration or deceleration.
• Sudden loss of drive in one gear range: If the key breaks completely, the affected gear will freewheel on the shaft, resulting in a total loss of power to that specific range while other ranges remain functional.
• Metal debris in transmission oil: A failing Woodruff key sheds fine metallic particles as it wears, which can be detected during oil changes or filter inspections.

Technical Specifications

Compatibility

This Woodruff key is designed for use in ZF heavy-duty powershift transmissions commonly found in construction machinery. It is compatible with the WG180, WG200, and WG210 series. It is also used in certain 4WG-200 and 5WG-200 variants where the key secures the GK10LD gear cluster to the main shaft. Always verify the keyway dimensions in your specific transmission model before installation.

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