ZF 4699.825.225 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.225 GP25 is a critical OEM genuine gear set designed for the high-torque planetary sections of heavy-duty construction machinery transmissions. This part, identified by SKU 4699.825.225, functions as the primary power transfer interface within the gear train, converting rotational input from the engine into usable mechanical force for the final drive. It sits directly within the planetary carrier assembly, meshing with sun gears and ring gears to achieve the necessary gear reduction. For optimal assembly integrity, this component is frequently replaced alongside the 4699025163: GP25 to ensure matched wear patterns and load distribution.

Symptoms of Failure

When the ZF 4699.825.225 GP25 begins to degrade, operators often notice distinct performance issues that can escalate quickly if ignored. Look for these specific failure indicators:

• Erratic gear engagement under load: The transmission may hesitate or clunk violently when shifting into higher gears, particularly on inclines.
• Metallic whining or grinding noise: A high-pitched sound emanating from the transmission housing, especially during deceleration, signals worn gear teeth.
• Contaminated transmission fluid with metal particles: Oil analysis reveals ferrous debris, indicating spalling or pitting on the gear flanks.
• Reduced power output at the wheels: The machine struggles to maintain speed under normal load, often accompanied by increased fuel consumption.

Technical Specifications

Compatibility

This OEM genuine part is engineered for use in ZF’s WG series transmissions commonly deployed in wheel loaders, graders, and compactors. It is specifically compatible with the following transmission models:

• ZF WG180 (all variants including WG180/2 and WG180/3)
• ZF WG200 (standard and high-torque configurations)
• ZF WG210 (late-model units with planetary reduction)
• ZF WG250 (select applications requiring GP25 gear geometry)

When servicing these transmissions, it is standard practice to inspect the 4699101153: HOUSING for cracks and the 4699102106: INPUT shaft for spline wear. Additionally, the 4699103122: OUTPUT flange should be checked for runout to prevent premature gear failure.

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