ZF 4699.801.125 GK10 | OEM Genuine Part

Overview

The ZF 4699.801.125 GK10 is a precision-engineered gear set assembly designed for the intermediate shaft cluster within heavy-duty ZF powershift transmissions. As an OEM genuine part, this component is critical for torque distribution and gear ratio management in construction machinery such as wheel loaders, graders, and dozers. The SKU 4699.801.125 directly replaces the original GK10 unit, ensuring exact tooth geometry and heat-treat specifications for reliable load handling. This part sits in the main transmission housing and interfaces directly with the 4699101080 HOUSING to maintain proper shaft alignment and oil flow channels.

Symptoms of Failure

• Transmission whining or grinding noise during gear shifts: Worn teeth on the GK10 assembly cause audible metal-on-metal contact, especially under load in lower gears.
• Intermittent gear slippage under heavy load: Damaged gear faces fail to maintain positive engagement, leading to power loss when pushing or lifting.
• Metallic debris in transmission oil filter or pan: Flaking or pitting on the gear surfaces generates fine metal particles that circulate through the system.
• Hard shifting or delayed clutch engagement: Excessive backlash from a worn GK10 disrupts the timing sequence between the input shaft and output clutches.

Technical Specifications

Compatibility

This GK10 gear set is primarily used in ZF WG series powershift transmissions common in construction machinery. It is a direct fit for the following transmission models: WG180, WG200, WG210, and WG240. The part also appears in select Ergopower and Ecomix drivelines. When replacing the GK10, always inspect the 0501329881 HOUSING COVER for cracks and replace the 0630513065 SNAP RING to secure the gear stack. A new 0634306309 O-RING is also recommended to prevent oil bypass at the housing interface.

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