ZF 4699.825.235 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.235 GP25 is a critical OEM genuine gearset assembly engineered for heavy-duty construction machinery transmissions. This part functions as a primary power transfer component within the planetary gear train, converting rotational force from the torque converter into usable torque for the driveline. Specifically, the GP25 gearset sits in the intermediate shaft cluster of ZF’s modular transmission architecture, where it meshes with adjacent planetary carriers to manage load distribution under high-stress digging and hauling cycles. The SKU 4699.825.235 is precision-machined to OEM tolerances, ensuring seamless integration with mating components like the 4699025167: GP25 and the 4699101164: HOUSING.

Symptoms of Failure

When the ZF 4699.825.235 GP25 begins to degrade, operators may notice these specific failure indicators:

• “Whining or grinding noise during gear engagement” – Worn gear teeth on the GP25 produce a high-pitched metallic whine, especially under load in forward gears. This often escalates to a grinding sound if debris enters the mesh zone.
• “Intermittent power loss in high torque applications” – As the gearset loses tooth profile integrity, the transmission may slip or hesitate when climbing grades or pushing heavy loads, mimicking clutch failure.
• “Metal particles in transmission fluid” – Flaking or spalling from the GP25’s hardened steel surface contaminates the oil, visible as silver or bronze glitter during routine drain intervals.
• “Vibration through the chassis at specific RPMs” – Unbalanced gear rotation from uneven wear causes harmonic vibrations that resonate through the 4699102106: INPUT shaft and 4699103122: OUTPUT assembly.

Technical Specifications

Compatibility

This OEM GP25 gearset is designed for ZF’s WG series powershift transmissions commonly found in wheel loaders, graders, and telehandlers. It is a direct fit for the following models:

• ZF WG180 – All variants (WG180/181/182)
• ZF WG200 – Standard and heavy-duty configurations
• ZF WG210 – Select high-torque versions (verify spline count)
• ZF WG150 – Retrofit applications using GP25 carrier

Always confirm the gearset’s helical orientation matches your existing 4699101164: HOUSING and 4699102106: INPUT shaft before installation.

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