ZF 4699.803.025 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.025 GK20 is a genuine OEM transmission component engineered for the demanding environment of construction machinery. This part functions as a critical sealing and alignment element within the gearbox assembly, ensuring precise oil flow and preventing contamination ingress. Specifically, the 4699.803.025 sits between the main housing and the output shaft area, acting as a robust interface that maintains hydraulic pressure and structural integrity. When paired with the 4699101046 HOUSING and the 4699301109 HOUSING, this SKU completes the sealed chamber necessary for reliable torque conversion. Its design directly supports the durability of the entire drivetrain, making it a non-negotiable part for any rebuild or preventive maintenance schedule.

Symptoms of Failure

When the ZF 4699.803.025 begins to degrade, operators will notice distinct performance issues. Look for these specific failure indicators:

• Hydraulic oil seepage around the transmission bell housing: A worn GK20 allows pressurized fluid to escape, leaving visible wet spots on the casing.
• Intermittent gear slipping under load: Loss of sealing pressure leads to inconsistent clutch pack engagement, particularly in lower gears.
• Contaminated transmission fluid with metallic debris: As the part fatigues, friction material and fine metal particles enter the oil, accelerating wear on adjacent components.
• Abnormal whining or grinding noise during deceleration: Misalignment caused by a failing 4699.803.025 creates audible stress on the 4699301017 BEARING COVER and the 4699301085 COVER.

Technical Specifications

Compatibility

This genuine ZF part is specifically designed for use in the following transmission models commonly found in wheel loaders, graders, and heavy-duty excavators:

• ZF WG180
• ZF WG200
• ZF WG210
• ZF 4WG-200
• ZF 6WG-200

Always verify your transmission serial number before ordering. The 4699.803.025 is a direct replacement for the original factory-installed component and is not interchangeable with aftermarket copies.

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