ZF 4699.003.075 GK20 | OEM Genuine Part

Overview

The ZF 4699.003.075 GK20 is a precision-engineered OEM genuine component designed for heavy-duty construction machinery transmissions. This part functions as a critical sealing and alignment element within the clutch pack assembly, ensuring proper hydraulic pressure distribution and preventing contamination ingress. The SKU 4699.003.075 is specifically calibrated for ZF’s modular transmission architecture, where it interfaces directly with the 4699101046 HOUSING and the 4699301109 HOUSING to maintain concentricity under high-torque loads. Without this component, the transmission’s internal clearances would exceed operational tolerances, leading to premature wear of adjacent assemblies.

Symptoms of Failure

• Hydraulic pressure loss during gear engagement: When the 4699.003.075 degrades, operators may notice delayed clutch pack activation or “soft” shifts, particularly under load in excavators or wheel loaders.
• External oil seepage near the bell housing: Worn sealing surfaces allow transmission fluid to escape, often visible as drips around the joint between the 4699301017 BEARING COVER and the main casing.
• Metallic debris in the oil pan: Fragments from a failing GK20 can contaminate the hydraulic circuit, causing erratic shift patterns and eventual clutch slippage.
• Abnormal vibration at idle: Loss of structural integrity in this part permits axial play, transmitting resonance through the driveline that worsens with transmission temperature.

Technical Specifications

Compatibility

This part is engineered for ZF’s WG series powershift transmissions commonly deployed in construction machinery. It is directly compatible with the following models: WG180, WG200, WG210, and WG250. The 4699.003.075 also fits select variants of the Ecomat 4HP and 6HP series used in articulated dump trucks and graders. For installations involving the 4699301085 COVER, verify the spline count matches your transmission’s output shaft to ensure proper indexing.

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