ZF 4699.825.218 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.218 GP25 is a critical OEM genuine gear set engineered for the power-dense transmission assemblies found in heavy construction machinery. Positioned within the planetary gear train, this component directly manages torque distribution from the engine to the driveline. As a precision-machined part, the SKU 4699.825.218 ensures minimal backlash and optimal load sharing under extreme stress. When replacing this gear set, it is standard practice to also inspect the mating 4699025085 GP25 for wear patterns, as both components share a common contact surface. This part is essential for maintaining the hydraulic and mechanical integrity of the transmission during high-cycle operations.

Symptoms of Failure

• Intermittent gear slipping under load: When the 4699.825.218 gear teeth wear or chip, the transmission may lose torque momentarily during excavation or grading, often accompanied by a grinding noise.
• Metallic debris in transmission fluid: A failing gear set sheds fine metal particles into the oil, which can be detected during routine fluid changes or via magnetic drain plugs.
• Vibration at specific RPM ranges: Worn gear profiles cause harmonic vibrations that are most noticeable between 1500-2200 RPM, indicating uneven tooth contact.
• Delayed engagement or harsh shifting: As the gear geometry degrades, the hydraulic clutch packs struggle to synchronize, leading to jerky starts or hesitation when shifting from neutral to drive.

Technical Specifications

Compatibility

This genuine ZF gear set is primarily designed for use in the WG180 and WG200 series transmissions, which are common in wheel loaders, dozers, and material handlers. It also fits select iterations of the WG160 and WG220 models where the GP25 planetary stage is employed. Always verify the housing alignment before installation; the 4699101156 HOUSING must be free of cracks or warping to ensure proper gear mesh. Additionally, the 4699102095 INPUT shaft and the 4699103075 OUTPUT shaft should be inspected for spline wear when replacing this gear set.

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