ZF 4699.804.141 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.141 GK25 is a genuine OEM gear set assembly engineered for the power-dividing section of heavy-duty ZF transmissions used in construction machinery. This SKU, 4699.804.141, functions as the primary reduction stage between the torque converter and the planetary gear sets, converting high-speed turbine rotation into usable torque for the driveline. It sits directly within the transmission housing and interfaces with the input shaft and output shaft assemblies. When replacing this unit, it is critical to also inspect the 4699004065: GK25 for matching wear patterns to ensure proper gear mesh alignment.

Symptoms of Failure

• Intermittent gear slipping under load: When the 4699.804.141 gear teeth become chipped or worn, the transmission will momentarily lose torque transfer during excavation or grading operations, often accompanied by a grinding noise.
• Metallic debris in transmission fluid: Pitting or spalling on the gear flanks generates fine steel particles that contaminate the hydraulic circuit, leading to valve body sticking and reduced shift quality.
• Whining or howling from the transmission center section: A high-pitched noise that increases with engine RPM but does not change with vehicle speed indicates bearing or gear surface fatigue within this GK25 assembly.
• Hard shifting between forward and reverse: Worn gear profiles create excessive backlash, causing delayed engagement and harsh clutch pack application when direction changes are commanded.

Technical Specifications

Compatibility

This genuine GK25 gear set is designed for use in ZF WG-series powershift transmissions commonly installed in wheel loaders, telehandlers, and excavators. It is a direct fit for the WG180, WG200, and WG210 models. The part also appears in certain 4WG-200 and 4WG-210 variants used in agricultural tractors. For correct installation, ensure the 4699101043: HOUSING is free of cracks and the 4699102063: INPUT shaft splines are not worn. The 4699103026: OUTPUT flange must also be checked for runout to prevent premature gear failure.

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