ZF 4699.825.257 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.257 GP25 is a precision-engineered gear set designed for the intermediate shaft cluster within heavy-duty ZF powershift transmissions. This OEM genuine part, identified by SKU 4699.825.257, is critical for torque multiplication and smooth power delivery in construction machinery such as wheel loaders and graders. It sits directly in the main drive train, meshing with the input and output shafts to maintain consistent gear ratios under extreme load. When paired with a replacement 4699025163 GP25, this component ensures the entire gear train operates with factory-specified backlash and minimal vibration.

Symptoms of Failure

• Whining or howling noise from the transmission under load: Worn teeth on the 4699.825.257 create a distinct high-pitched sound, especially during acceleration or when the machine is under heavy strain.
• Intermittent gear slipping in forward or reverse: As the gear profile degrades, the transmission may momentarily lose engagement, causing a sudden drop in wheel speed and a jerking motion.
• Metallic debris in the transmission oil filter or magnetic drain plug: Flaking or pitting of the gear surface releases fine steel particles, a clear sign that the GP25 set requires immediate replacement.
• Hard shifting or delayed clutch engagement: Worn gear teeth increase rotational play, confusing the hydraulic control system and leading to rough or delayed shifts between ranges.

Technical Specifications

Compatibility

This gear set is engineered for ZF WG-series powershift transmissions commonly used in construction machinery. It is a direct fit for the WG180, WG200, and WG211 models. The 4699.825.257 also integrates seamlessly into the Ergopower and Ecomat families where intermediate shaft gear clusters are shared. For full assembly integrity, always inspect the 4699101153 HOUSING for cracks, the 4699102106 INPUT shaft for spline wear, and the 4699103122 OUTPUT shaft for bearing journal damage during replacement.

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