ZF 4699.004.103 GK25 | OEM Genuine Part

Overview

The ZF 4699.004.103 GK25 is a precision-engineered genuine OEM component designed for the clutch pack assembly within heavy-duty ZF powershift transmissions. This part functions as a critical friction element, managing torque transfer and gear engagement in demanding construction machinery applications. The SKU 4699.004.103 sits directly within the rotating clutch drum, where it interfaces with steel separator plates to provide smooth, reliable shifting under high load conditions. As an OEM genuine part, it ensures exact fitment and material composition matching the original transmission specifications, eliminating the risk of premature wear associated with aftermarket alternatives.

Symptoms of Failure

• Delayed or harsh gear engagement – When the GK25 friction disc wears thin, clutch pack clearance increases, causing noticeable hesitation or jarring shifts during direction changes.
• Transmission overheating – Worn friction material generates excessive heat due to slipping, often indicated by elevated transmission oil temperatures on the machine’s dashboard.
• Loss of power under load – A failing 4699.004.103 disc allows clutch pack slippage, resulting in reduced tractive effort when climbing grades or pushing heavy material.
• Metallic debris in oil filter – Advanced wear produces fine metal particles from the friction lining, detectable during routine oil sampling or filter inspection.

Technical Specifications

Compatibility

This genuine ZF 4699.004.103 GK25 friction disc is primarily compatible with the following ZF transmission models commonly found in wheel loaders, graders, and telehandlers:

• ZF WG180 – Used in compact construction equipment requiring high torque density.
• ZF WG200 – Standard in mid-size loaders and backhoe loaders.
• ZF 4WG200 – Four-speed variant for demanding off-highway applications.
• ZF 6WG200 – Six-speed version for high-speed roading and heavy hauling.

During installation, this disc is typically paired with the 4699101098 HOUSING which contains the clutch pack, and the 4699301184 HOUSING that supports the piston assembly. The 4699301015 HOUSING COVER seals the clutch drum, while the 4699301085 COVER provides access for service. Always replace the 0634303980 O-RING and 0637885612 BREATHER when servicing this assembly to prevent contamination.

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