ZF 4699.804.049 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.049 GK25 is a critical OEM genuine component engineered for the internal clutch pack assembly within ZF heavy-duty powershift transmissions. This part, identified by SKU 4699.804.049, functions as a precision-machined piston or actuation plate that directs hydraulic pressure to engage specific gear sets. Without this component, the transmission cannot achieve proper clutch pack compression, leading to a complete loss of torque transfer. It is typically housed within the main transmission casing, working in concert with the 4699101043 HOUSING and the 4699301106 HOUSING to create a sealed hydraulic circuit.

Symptoms of Failure

When the ZF 4699.804.049 GK25 begins to degrade, operators will notice distinct performance issues. Look for these specific failure indicators:

• Delayed gear engagement or “slipping” under load: A worn piston cannot maintain hydraulic pressure, causing the clutch pack to slip during acceleration.
• Internal transmission oil leaks: Cracks or scoring on the part surface allow ATF to bypass the piston seal, often pooling near the bell housing.
• Erratic shifting or harsh engagement: Inconsistent pressure application results in jarring shifts, especially between forward and reverse gears.
• Overheating transmission fluid: Continuous slippage generates excessive heat, triggering warning lights on construction machinery dashboards.

Technical Specifications

Compatibility

This OEM genuine part is specifically designed for ZF powershift transmission models commonly found in construction machinery. It is a direct fit for the WG180, WG200, and WG211 series transmissions. Additionally, it is compatible with the 4WG200 and 6WG200 variants used in wheel loaders, dozers, and graders. Always verify your transmission model tag before installation. The part integrates directly with the 4699301015 HOUSING COVER and the 4699301085 COVER to ensure a leak-proof assembly.

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