ZF 4699.825.130 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.130 GP25 is a critical OEM genuine gear component engineered for the high-torque planetary sections of ZF construction machinery transmissions. This precision-machined part, identified by SKU 4699.825.130, functions as a primary drive gear within the countershaft assembly, ensuring smooth power transfer from the engine to the driveline under extreme load conditions. It is specifically designed to mesh with the internal splines of the 4699101157 HOUSING and the 4699201018 HOUSING, forming a sealed, lubricated gear train that withstands continuous heavy-duty operation in wheel loaders and excavators.

Symptoms of Failure

When the ZF 4699.825.130 GP25 gear begins to wear, operators typically notice distinct performance degradation. Gear whining or grinding noises during acceleration or deceleration are early indicators of tooth surface fatigue. Intermittent gear slipping under load—where the transmission momentarily loses power while climbing or digging—often points to worn gear teeth unable to maintain proper engagement. Metal particles in the transmission oil during routine drain intervals confirm internal gear degradation. Finally, difficulty engaging forward or reverse gears at low speeds suggests the GP25 gear has developed pitting or chipping, compromising the shift sequence.

Technical Specifications

Compatibility

This OEM genuine GP25 gear is a direct replacement for ZF transmission models in the WG series, specifically the WG180, WG200, and WG220 heavy-duty transmissions. It is also compatible with the Ecomat 4HP and 6HP series used in construction machinery such as Liebherr, Caterpillar, and Volvo wheel loaders. The gear interfaces directly with the 4699309080 HOUSING COVER and is secured using the 0636100132 TORX SCREW to maintain precise axial alignment.

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