ZF 4699.804.064 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.064 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 regulation and fluid containment. The SKU 4699.804.064 is specifically manufactured to ZF’s exacting tolerances, making it essential for maintaining the integrity of the transmission’s internal oil circuits. When installed correctly, this part works in concert with the 4699101065 HOUSING and the 4699301142 HOUSING to prevent cross-contamination between lubrication and cooling channels.

Symptoms of Failure

• Hydraulic pressure loss during gear engagement — A worn 4699.804.064 can cause inconsistent clutch pack application, leading to delayed or harsh shifting in wheel loaders and excavators.
• External oil seepage near the transmission housing — Deterioration of the sealing surface results in visible fluid leaks, often mistaken for a failing 0634301843 SHAFT SEAL.
• Erratic transmission response under load — Operators may notice surging or slipping when the machine is under heavy strain, indicating the part is no longer maintaining proper backpressure.
• Contaminated transmission fluid — Debris ingress through a compromised seal can accelerate wear on adjacent components like the 4699301015 HOUSING COVER.

Technical Specifications

Compatibility

This OEM genuine part is primarily compatible with ZF WG180, WG200, and WG250 series transmissions commonly found in construction machinery such as compact loaders, backhoes, and telescopic handlers. It also fits select variants of the ZF 4WG-200 and 6WG-250 torque converter systems. For proper installation, ensure the mating surfaces on the 4699301085 COVER are clean and free of burrs. Always replace the 0634303980 O-RING simultaneously to guarantee a leak-free seal.

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