ZF 4699.825.287 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.287 GP25 is a critical OEM genuine gear set assembly designed for heavy-duty construction machinery transmissions. Positioned within the planetary gear train, this GP25 component directly manages torque distribution and gear ratio engagement in ZF’s WG series powershift transmissions. The SKU 4699.825.287 serves as the primary power transfer element, converting engine output into controlled wheel or driveline motion under extreme load conditions. This part is engineered to withstand high cyclic stress in excavators, wheel loaders, and graders, ensuring precise gear synchronization during demanding operations.

Symptoms of Failure

• Delayed or harsh gear engagement: When the GP25 wears, operators notice a pronounced lag or jarring shift between forward and reverse gears, often accompanied by a grinding noise.
• Transmission fluid contamination with metallic debris: Worn gear teeth shed fine metal particles into the oil, visible during routine drain inspections as glitter-like sediment.
• Intermittent power loss under load: The transmission may slip or fail to hold torque when climbing grades or pushing heavy material, indicating the GP25 can no longer maintain proper gear mesh.
• Whining or howling from the transmission housing: A high-pitched noise that increases with engine RPM signals advanced wear on the GP25’s bearing surfaces or tooth profiles.

Technical Specifications

Compatibility

This GP25 gear set is specifically engineered for ZF WG180, WG200, and WG210 powershift transmissions commonly found in construction machinery. It is a direct replacement for the original equipment gear cluster in these models. The 4699.825.287 interfaces directly with the HOUSING assembly and the INPUT shaft, while the OUTPUT shaft transmits the reduced torque to the final drive. For complete rebuilds, pairing this part with the 4699025195 GP25 variant ensures full gear train compatibility across WG180 and WG200 series units.

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