ZF 4699.004.065 GK25 | OEM Genuine Part

Overview

The ZF 4699.004.065 GK25 is a precision-engineered OEM genuine part designed for the demanding environment of construction machinery transmissions. This component functions as a critical interface within the planetary gear set, ensuring smooth torque transfer and load distribution under high-stress operating conditions. Specifically, the SKU 4699.004.065 serves as a wear-prone element that maintains gear alignment and reduces vibration in heavy-duty drivelines. When installed as part of a complete assembly, it works in concert with the 4699101043 HOUSING to provide structural integrity and with the 4699102063 INPUT to manage initial power flow. Its robust construction is essential for preventing premature failure in excavators, wheel loaders, and other off-highway equipment.

Symptoms of Failure

When the ZF 4699.004.065 GK25 begins to degrade, operators will notice distinct performance issues. Look for these specific failure symptoms to diagnose a worn part:

• Intermittent gear slipping under load – The transmission may momentarily lose power transfer when climbing grades or digging, indicating the GK25 can no longer maintain proper gear engagement.
• Metallic grinding noise during shifting – A high-pitched whine or grinding sound, particularly when transitioning between forward and reverse, suggests the part has developed surface fatigue or pitting.
• Oil contamination with metallic debris – If transmission fluid samples show fine steel particles, the 4699.004.065 is likely shedding material into the lubrication system, which can damage the 4699103026 OUTPUT assembly.
• Excessive backlash in the drivetrain – A noticeable clunk when engaging the PTO or turntable indicates the GK25 has worn beyond tolerance, affecting the 4699105010 TURNTABLE BEARING alignment.

Technical Specifications

Compatibility

This genuine ZF part is engineered for use in the following transmission models commonly found in construction machinery:

• ZF WG180 – 6-speed powershift transmission for wheel loaders
• ZF WG200 – Heavy-duty version used in excavators and graders
• ZF WG210 – High-torque variant for material handlers
• ZF Ergopower – Series 3 and 4 transmissions for telescopic handlers

Always verify the part number against your transmission’s serial plate before installation. The 4699.004.065 is not interchangeable with earlier GK20 or GK30 variants.

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