ZF 4699.804.038 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.038 GK25 is a critical OEM genuine component designed for heavy-duty construction machinery transmissions. This part functions as a precision-machined shift element within the valve body assembly, controlling hydraulic flow to engage specific gear sets. The SKU 4699.804.038 ensures exact OEM tolerances for reliable clutch pack actuation under extreme load conditions. Positioned directly in the transmission control unit, it works in concert with the 4699101043 HOUSING to maintain proper oil pressure distribution. Without this component, gear engagement becomes erratic, leading to drivetrain inefficiency.

Symptoms of Failure

• Delayed or harsh shifting: When the 4699.804.038 wears, hydraulic pressure drops, causing noticeable lag between gear changes or jarring engagements during acceleration.
• Transmission oil leaks near the valve body: A degraded seal surface on this part allows ATF to escape, often pooling around the 4699301106 HOUSING connection point.
• Intermittent gear slipping under load: Worn internal passages fail to hold clutch packs engaged, resulting in RPM flare-ups when climbing grades or moving heavy materials.
• Erratic neutral-to-drive engagement: Operators may experience unexpected lurching or failure to engage forward gears, particularly in cold-start conditions.

Technical Specifications

Compatibility

This OEM genuine part is engineered for ZF WG-series transmissions commonly found in wheel loaders, excavators, and telehandlers. It directly fits the following models:

• ZF WG180 (all variants)
• ZF WG200 (including WG200-1 and WG200-2)
• ZF WG210 (early production runs)
• ZF 4WG-200 (construction machinery applications)

Always verify your transmission serial number before ordering. The 4699301015 HOUSING COVER and 4699301085 COVER are frequently replaced alongside this shift element during valve body overhauls.

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