ZF 4699.801.251 GK10 | OEM Genuine Part

Overview

The ZF 4699.801.251 GK10 is a precision-engineered gear set assembly designed for heavy-duty construction machinery transmissions. This OEM genuine part functions as the primary power transfer component within the planetary gear train, converting input torque from the engine into usable rotational force for the driveline. The SKU 4699.801.251 is specifically located in the intermediate shaft section of ZF’s modular transmission architecture, where it meshes with the 4699001121: GK10 to maintain gear ratio stability under extreme loads. Its hardened steel construction ensures reliable performance in excavators, wheel loaders, and crawler dozers operating in demanding environments.

Symptoms of Failure

• Intermittent gear slipping under load: When the 4699.801.251 wears, operators may notice sudden loss of power during digging or lifting cycles, often accompanied by a grinding noise from the transmission housing.
• Metallic debris in transmission oil: Worn gear teeth produce fine steel particles that contaminate the hydraulic fluid, visible during routine oil changes as a glitter-like suspension.
• Delayed engagement in forward/reverse: A failing GK10 assembly causes a noticeable lag of 2-3 seconds when shifting between directions, particularly in cold-start conditions.
• Vibration at specific RPM ranges: Uneven tooth wear creates harmonic vibrations felt through the chassis at 1200-1800 RPM, often misdiagnosed as engine issues.

Technical Specifications

Compatibility

This 4699.801.251 GK10 gear set is compatible with ZF’s WG180, WG200, and WG250 transmission families used in construction machinery. It directly replaces the original equipment in models such as the ZF WG180-6, WG200-8, and WG250-10 series, commonly found in Liebherr, Caterpillar, and Komatsu equipment. The part also fits select ZF Ergopower and Ecolife variants when paired with the correct 4699101095: HOUSING and 4699102158: INPUT shaft assemblies. For final drive applications, ensure the 4699103063: OUTPUT flange is properly aligned during installation.

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