ZF 4699.803.021 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.021 GK20 is a critical OEM genuine component engineered for heavy-duty construction machinery transmissions. This part functions as a precision-machined gear kit or shift assembly within the transmission housing, ensuring smooth power transfer and gear engagement under extreme loads. The SKU 4699.803.021 is specifically designed to interface with the main housing and bearing covers, maintaining alignment and reducing wear in high-torque applications. As a genuine ZF part, it guarantees exact tolerances and metallurgical consistency required for long service intervals in excavators, loaders, and graders.

Symptoms of Failure

• Hard shifting or gear slippage – When the 4699.803.021 wears, operators may experience delayed engagement or unexpected disengagement under load, often accompanied by grinding noises.
• Metallic debris in transmission fluid – Worn teeth or splines on this part generate fine metal particles, visible during oil changes or filter inspections.
• Oil leaks near the housing interface – Degraded sealing surfaces on the GK20 can cause fluid seepage around the 4699101046 HOUSING or 4699301109 HOUSING, leading to low oil levels and overheating.
• Vibration during operation – Imbalanced or worn components create driveline shudder, especially at specific RPM ranges, indicating the need for immediate replacement.

Technical Specifications

Compatibility

This part is engineered for ZF WG180, WG200, and WG210 series transmissions commonly found in construction machinery from brands like Liebherr, Caterpillar, and Volvo CE. It is also compatible with select ZF 4WG-200 and 6WG-200 variants. Always verify your transmission model and serial number before installation. The GK20 integrates directly with the 4699301017 BEARING COVER and 4699301085 COVER to ensure proper axial retention and sealing.

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