ZF 4699.804.103 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.103 GK25 is a critical OEM genuine gear set assembly designed for heavy-duty construction machinery transmissions. This component functions as the primary power transfer mechanism within the planetary gear train, converting engine torque into usable rotational force for the driveline. Positioned directly between the input shaft and the output hub, the GK25 assembly ensures smooth engagement under extreme load conditions. The SKU 4699.804.103 is engineered to meet ZF’s original manufacturing tolerances, providing direct interchangeability with factory-installed units. When paired with the 4699004017: GK25, this part forms the core of the transmission’s gear reduction system.

Symptoms of Failure

When the ZF 4699.804.103 GK25 begins to wear, operators will notice distinct performance degradation. Delayed gear engagement during shifting is a primary indicator, often accompanied by a grinding noise from the transmission housing. Intermittent power loss under load, particularly when climbing grades or moving heavy materials, signals internal gear tooth wear. Metallic debris in the transmission fluid is a definitive sign of spalling on the gear surfaces. Finally, vibration through the chassis during acceleration points to uneven gear mesh within the GK25 assembly.

Technical Specifications

Compatibility

This GK25 gear set is specifically engineered for ZF WG-series powershift transmissions commonly used in wheel loaders, excavators, and telehandlers. It is a direct fit for the WG180, WG200, and WG211 transmission models. The assembly also integrates with the 4699101065: HOUSING to contain lubrication and with the 4699102082: INPUT shaft for torque input. For output side integration, the 4699103026: OUTPUT component is required to complete the driveline connection. Always verify your transmission model number before ordering.

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