ZF 4699.803.086 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.086 GK20 is a critical OEM genuine gear set component engineered for high-torque applications within ZF’s heavy-duty transmission assemblies. This part functions as the primary power transfer interface, converting rotational input from the engine into precisely controlled output for construction machinery drivelines. Positioned within the planetary gear train, the SKU 4699.803.086 ensures smooth engagement under extreme loads, reducing wear on adjacent components. Its hardened alloy construction withstands continuous shock loads typical in excavators and wheel loaders, making it indispensable for maintaining transmission integrity in demanding work cycles.

Symptoms of Failure

• Erratic gear engagement under load: When the 4699.803.086 wears, operators may experience delayed or harsh shifting, particularly when climbing grades or lifting heavy materials.
• Metallic grinding noise during operation: A distinct whining or grinding sound from the transmission housing often indicates pitting or chipping on the gear teeth of this component.
• Oil contamination with metallic debris: Worn gear surfaces shed fine metal particles into the hydraulic fluid, visible during routine oil changes as a silver or bronze sheen.
• Reduced power transmission efficiency: The machine may feel sluggish or require higher RPMs to achieve normal travel speeds, signaling internal slippage within the gear set.

Technical Specifications

Compatibility

This genuine GK20 gear set is designed for integration into ZF’s WG180, WG200, and WG210 series transmissions commonly deployed in construction machinery. It directly replaces the original equipment part in models such as the ZF WG180-1, WG200-2, and WG210-3. The 4699.803.086 interfaces with the 4699003082 GK20 companion gear and requires precise alignment with the 4699101097 HOUSING for proper load distribution. For complete assembly, it works in conjunction with the 4699102166 INPUT shaft and the 4699103060 OUTPUT flange. Always verify transmission serial numbers before ordering to ensure fitment.

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