ZF 4699.804.146 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.146 GK25 is a precision-engineered gear set component designed for the power take-off (PTO) section of heavy-duty construction machinery transmissions. As an OEM genuine part, it serves as the primary reduction gear within the GK25 assembly, directly transferring torque from the input shaft to the output drive. This SKU (4699.804.146) is critical for maintaining the correct gear ratio in ZF drivelines, ensuring smooth power delivery under extreme loads. It is frequently replaced alongside the 4699004128: GK25 assembly to restore factory tolerances in worn units.

Symptoms of Failure

• Whining or grinding noise from the transmission housing — A worn 4699.804.146 gear produces a distinct high-pitched whine during acceleration or deceleration, often mistaken for bearing failure.
• Intermittent gear slipping under load — When the gear teeth become chipped or excessively worn, the PTO may disengage momentarily during heavy digging or lifting operations.
• Metallic debris in transmission fluid — Flakes or particles found during oil changes indicate advanced wear of the gear surface, requiring immediate replacement to prevent cascading damage to the 4699101098: HOUSING.
• Reduced hydraulic pump output — A failing gear set cannot maintain proper RPM to the hydraulic system, leading to sluggish implement response times.

Technical Specifications

Compatibility

This genuine ZF gear is engineered for the GK25 sub-assembly found in the following transmission models: WG180, WG200, WG210, and WG220. It is also used in certain variants of the Ecomat 4HP and 6HP series when equipped with a PTO module. The 4699.804.146 interfaces directly with the 4699102146: INPUT shaft and the 4699103026: OUTPUT flange. Always verify the gear ratio matches your specific transmission tag before installation.

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