ZF 4699.004.126 GK25 | OEM Genuine Part

Overview

The ZF 4699.004.126 GK25 is a precision-engineered OEM genuine part designed for heavy-duty construction machinery transmissions. This component functions as a critical sealing and alignment element within the valve body or clutch housing assembly, ensuring proper hydraulic pressure distribution and preventing cross-contamination between oil circuits. The SKU 4699.004.126 is specifically manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in high-stress environments. It sits adjacent to the 4699101098 HOUSING and the 4699301184 HOUSING, forming a sealed chamber that directs lubrication to planetary gearsets.

Symptoms of Failure

• Hydraulic pressure loss during gear engagement: A worn 4699.004.126 can cause internal leakage, leading to delayed or harsh shifting in ZF transmissions.
• Oil seepage around the transmission housing: When this part degrades, you may notice fluid accumulation near the 4699301015 HOUSING COVER or the 4699301085 COVER.
• Unusual whining or grinding noises: Insufficient sealing from a failing GK25 allows debris to enter bearing surfaces, producing audible distress during operation.
• Transmission overheating: Reduced oil flow due to internal bypassing forces the system to work harder, elevating operating temperatures.

Technical Specifications

Compatibility

This OEM genuine part is compatible with several ZF transmission models commonly used in construction machinery, including the WG180, WG200, WG210, and WG250 series. It also fits select variants of the Ecomat 4HP and 5HP transmissions. Always verify your transmission’s serial number against the 4699.004.126 specification before installation. For complete sealing integrity, pair this part with the 0634303980 O-RING and the 0637885612 BREATHER.

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