ZF 4699.805.021 GK30 | OEM Genuine Part

Overview

The ZF 4699.805.021 GK30 is a precision-engineered OEM genuine gear set component designed for heavy-duty construction machinery transmissions. This part functions as a critical power transfer element within the planetary gear assembly, converting engine torque into usable mechanical force for demanding off-highway applications. The SKU 4699.805.021 sits directly in the main drive train of ZF’s modular transmission systems, where it interfaces with the 4699005004: GK30 to ensure synchronized gear engagement under extreme loads. Its hardened steel construction resists wear from continuous operation in excavators, wheel loaders, and graders.

Symptoms of Failure

• Erratic gear engagement or slipping under load – When the 4699.805.021 wears, operators may notice delayed or rough shifting, especially when climbing grades or lifting heavy materials.
• Metallic grinding noises from the transmission housing – Worn gear teeth produce a distinct whining or grinding sound during acceleration, indicating the need for immediate replacement.
• Oil contamination with metallic debris – Flakes or particles in the transmission fluid signal that the GK30 gear set is degrading, often accompanied by reduced hydraulic pressure.
• Vibration through the driveline – Uneven wear on the gear teeth creates harmonic vibrations felt in the operator cab, worsening at higher RPMs.

Technical Specifications

Compatibility

This OEM genuine part is engineered for ZF’s WG series transmissions commonly used in construction machinery. It is a direct fit for the WG180, WG200, and WG210 models, as well as select variants of the Ecomat 4HP series. The 4699.805.021 GK30 works in conjunction with the 4699101018: HOUSING to maintain proper gear alignment, while the 4699102051: INPUT shaft and 4699103012: OUTPUT flange complete the torque path. Always verify your transmission serial number before ordering.

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