ZF 4699.804.124 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.124 GK25 is a precision-engineered gear kit designed for the power-dense GK25 transmission series, commonly deployed in heavy construction machinery such as wheel loaders, telehandlers, and excavators. This OEM genuine part functions as the primary reduction gearset within the transmission housing, transferring torque from the input shaft to the output shaft while managing high rotational speeds and load stresses. The SKU 4699.804.124 identifies the complete gear assembly, which includes hardened helical gears and synchronizer components. When installed alongside the 4699004121: GK25 main shaft, this kit ensures seamless power flow and minimal backlash during operation.

Symptoms of Failure

When the ZF 4699.804.124 gear kit begins to wear, operators typically notice distinct mechanical issues. “Transmission gear slipping under load” is a common complaint, where the machine loses power during digging or lifting cycles. “Whining or grinding noise from the transmission housing” often indicates pitting or chipping on the gear teeth. Another frequent failure sign is “metallic debris in the transmission oil filter”, which points to advanced gear degradation. Finally, “jerky engagement when shifting between forward and reverse” can occur if the gear set loses its precise tooth alignment, requiring immediate inspection of the 4699101098: HOUSING for cracks or warping.

Technical Specifications

Compatibility

This gear kit is engineered for ZF’s GK25 transmission series, which is widely used in construction machinery. It is directly compatible with the following ZF transmission models: WG180, WG200, WG210, and WG220. The part also fits select variants of the 4WG-200 and 5WG-200 series. For proper installation, ensure the 4699102146: INPUT shaft and 4699103059: OUTPUT shaft are inspected for wear, as misalignment can accelerate gear failure.

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