ZF 4699.825.179 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.179 GP25 is a precision-engineered gear component designed for the clutch pack assembly within heavy-duty ZF transmissions used in construction machinery. This OEM genuine part, identified by SKU 4699.825.179, functions as a critical torque-transfer element, ensuring smooth engagement and disengagement of planetary gear sets. It sits directly within the transmission’s hydraulic clutch system, where it interfaces with the input shaft and output shaft to manage power flow under extreme loads. Replacing a worn GP25 with this exact OEM specification restores original shift quality and prevents drivetrain inefficiencies.

Symptoms of Failure

When the ZF 4699.825.179 GP25 begins to degrade, operators often notice specific performance issues. Common failure symptoms include:

• Delayed gear engagement – The transmission hesitates before shifting, particularly under load, indicating the GP25 is not gripping the clutch pack effectively.
• Intermittent gear slipping – A sudden loss of power during acceleration, often accompanied by a high-pitched whine, suggests the GP25 has worn splines or surface damage.
• Contaminated transmission fluid – Metallic debris in the oil filter or pan points to the GP25 shedding material, which can clog hydraulic passages.
• Erratic shifting under load – The transmission may lurch or fail to hold a gear when climbing or hauling, a direct result of the GP25 losing its friction capacity.

Technical Specifications

Compatibility

This ZF 4699.825.179 GP25 is engineered for use in the following ZF transmission models commonly found in construction machinery: WG180, WG200, WG210, and WG220 series. It is also compatible with certain variants of the Ecomat 4HP and 5HP series used in wheel loaders and excavators. Always verify the transmission serial number to ensure the GP25 matches the clutch pack stack height. For a complete rebuild, pair this part with the 4699025081 GP25 for dual-plate configurations, and inspect the HOUSING for wear. The INPUT shaft and OUTPUT shaft must also be checked for spline damage during service.

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