ZF 4699.825.123 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.123 GP25 is a critical gearset assembly engineered for heavy-duty construction machinery transmissions. This OEM genuine part functions as the primary power transfer unit within the transmission housing, converting engine torque into controlled rotational force for the driveline. The SKU 4699.825.123 specifically designates a factory-spec GP25 planetary gear set, which sits between the input shaft and the output shaft in the transmission’s main power flow path. Designed to withstand extreme loads and high cycle counts, this component ensures precise gear engagement and minimal power loss during operation.

Symptoms of Failure

When the ZF 4699.825.123 GP25 begins to wear, operators may notice distinct performance issues. Gear slipping under load is a primary symptom, often accompanied by a grinding noise during acceleration. Oil leaks from the transmission housing can occur as internal seals degrade around the gearset. Another common failure sign is delayed engagement when shifting, where the transmission hesitates before moving into gear. Finally, metallic debris in the transmission fluid indicates advanced wear of the GP25 gear teeth, requiring immediate replacement to prevent catastrophic damage.

Technical Specifications

Compatibility

This GP25 gearset is compatible with ZF WG180, WG200, and WG210 series transmissions commonly used in wheel loaders, graders, and dump trucks. It also fits select models in the ZF 4WG-200 and 6WG-200 families. Always verify your transmission model number before ordering. The part interfaces directly with the 4699025066 GP25 companion gearset and mounts within the 4699101071 HOUSING. It receives power from the 4699102106 INPUT shaft and transfers torque to the 4699103104 OUTPUT shaft assembly.

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