ZF 4699.803.045 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.045 GK20 is a precision-engineered gear kit designed for the power-dense transmission systems found in heavy construction machinery. This OEM genuine part sits at the core of the planetary gearset assembly, directly managing torque distribution from the engine to the driveline. The SKU 4699.803.045 is critical for maintaining the exacting gear mesh tolerances required in ZF’s GK20 series, ensuring smooth power flow under extreme load conditions. When this component degrades, it compromises the entire transmission’s ability to transfer power efficiently, leading to operational delays and costly downtime on job sites.

Symptoms of Failure

• Intermittent gear slipping under load: When the 4699.803.045 wears, the gear teeth lose their precise engagement, causing the transmission to momentarily lose drive power while climbing grades or hauling heavy loads.
• Metallic grinding noise from the transmission housing: Worn gear surfaces produce a distinct, high-pitched whine or grinding sound, particularly noticeable during gear shifts or when the machine is under full throttle.
• Contaminated transmission fluid with metal particles: As the GK20 gear set erodes, microscopic metal shavings circulate through the hydraulic system, often visible as a metallic sheen on the dipstick or in the filter.
• Delayed or harsh engagement: A failing gear kit can cause a noticeable lag between selecting a gear and the transmission actually engaging, followed by a jarring clunk as the worn teeth finally catch.

Technical Specifications

Compatibility

This genuine ZF 4699.803.045 GK20 gear kit is engineered for use in the following ZF transmission models commonly deployed in construction machinery: WG180, WG200, and WG211 series. It also fits select iterations of the WG150 and WG250 transmissions where the GK20 planetary set is specified. Always verify your transmission’s serial number against the OEM parts catalog to ensure correct fitment.

When replacing the 4699.803.045, it is standard practice to also inspect and replace the 4699003020: GK20 companion gear, as these sets wear in unison. The 4699101046: HOUSING must be checked for scoring, while the 4699102092: INPUT shaft and 4699103030: OUTPUT shaft should be measured for runout to prevent premature failure of the new gear kit.

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