ZF 4699.804.119 GK25 II | OEM Genuine Part

Overview

The ZF 4699.804.119 GK25 II is a precision-engineered OEM genuine part designed for the upper gear train assembly in heavy-duty construction machinery transmissions. This component functions as a critical torque-transfer interface within the GK25 II planetary gear set, ensuring smooth power distribution from the input shaft to the output hub. As a direct replacement for the SKU 4699.804.119, it maintains factory tolerances for minimal backlash and maximum load capacity. In the transmission architecture, it sits between the INPUT shaft and the OUTPUT assembly, working in concert with the GK25 II carrier and the HOUSING to maintain gear alignment under extreme loads.

Symptoms of Failure

• Erratic gear engagement under load: When the 4699.804.119 wears, operators report delayed or harsh shifting during excavation or lifting, often accompanied by a grinding noise from the transmission housing.
• Oil seepage at the housing joint: A common long-tail search query is “ZF transmission oil leak near GK25 housing.” Worn sealing surfaces on this part allow hydraulic fluid to escape, leaving visible residue on the HOUSING flange.
• Progressive torque loss in forward gears: As the gear set degrades, the machine struggles to maintain speed on inclines, with the transmission temperature rising above 110°C due to increased friction.
• Metallic debris in transmission fluid: Advanced wear produces fine steel particles in the oil filter, indicating imminent failure of the 4699.804.119 gear teeth or bearing surfaces.

Technical Specifications

Compatibility

This genuine ZF part is engineered for the GK25 II planetary gear set, which is used across multiple ZF transmission models in construction machinery. It is a direct fit for the WG180, WG200, and WG211 series transmissions commonly found in wheel loaders, excavators, and telehandlers. The 4699.804.119 also integrates with the 4WG-200 and 5WG-200 variants. For proper installation, ensure the mating HOUSING and OUTPUT components are free of wear. Always replace the O-RING during reassembly to prevent fluid leaks.

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