ZF 4699.825.212 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.212 GP25 is a genuine OEM gear component engineered for the high-torque planetary sections of ZF construction machinery transmissions. This part, identified by SKU 4699.825.212, functions as a precision-ground pinion or planetary gear within the final drive assembly, directly engaging with the ring gear and sun gear to transfer rotational force. It is a critical wear item that maintains the correct gear mesh pattern, ensuring smooth power delivery under heavy load conditions. The GP25 designation indicates a specific tooth profile and heat-treatment specification required for long service life in excavators and wheel loaders.

Symptoms of Failure

When the ZF 4699.825.212 GP25 begins to fail, operators often notice intermittent gear slipping under load during digging or pushing operations. A second common symptom is a high-pitched whining noise from the transmission housing, particularly when turning or reversing, which indicates uneven tooth wear. You may also observe metallic particles in the transmission oil filter during routine maintenance, a clear sign of spalling on the gear face. Finally, vibration through the chassis at low speeds can occur as the gear loses its correct backlash tolerance.

Technical Specifications

Compatibility

This genuine ZF GP25 gear is primarily compatible with the WG180 and WG200 series transmissions, which are widely used in mid-size construction machinery. It also fits select WG150 and WG250 planetary stages where the 25-tooth pinion is specified. Always verify the gear ratio and spline count against your transmission’s parts manual before ordering. The part is not interchangeable with the GP24 or GP26 variants due to different tooth geometry.

During installation, this gear interfaces directly with the 4699101156 HOUSING and the 4699201019 HOUSING to form the planetary carrier assembly. The 4699309078 HOUSING COVER seals the gear cluster, while the 0636100132 TORX SCREW secures the cover to the main housing. Proper torque on these fasteners is essential to prevent axial play.

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